1 session 级别设置event
SQL> ALTER SESSION SET EVENTS='10053 trace name context forever, level 1';
Session altered.
2 执行语句
SQL> select /*+10053 test*/*
2 from dao_objects1 t1 ,dao_objects2 t2,emp t3
3 where t1.object_id=t2.object_id
4 and t2.object_id=t3.empno ;
3 关闭事件
SQL> ALTER SESSION SET EVENTS '10053 trace name context off';
Session altered.
查看trace
SQL> !
[oracle@server ~]$ cd /u01/oracle/admin/orcl/udump/
[oracle@server udump]$ ll -t
total 156
-rw-r----- 1 oracle oinstall 77084 Dec 6 20:04 orcl_ora_9177.trc
-rw-r----- 1 oracle oinstall 2279 Dec 6 17:48 orcl_ora_5067.trc
-rw-r----- 1 oracle oinstall 687 Dec 6 17:47 orcl_ora_5019.trc
-rw-r----- 1 oracle oinstall 2221 Sep 11 19:46 orcl_ora_4856.trc
-rw-r----- 1 oracle oinstall 659 Sep 11 19:46 orcl_ora_4810.trc
-rw-r----- 1 oracle oinstall 691 Jun 10 09:08 orcl_ora_6014.trc
-rw-r----- 1 oracle oinstall 903 Jun 10 09:00 orcl_ora_5529.trc
-rw-r----- 1 oracle oinstall 994 Jun 10 09:00 orcl_ora_5478.trc
-rw-r----- 1 oracle oinstall 659 Jun 10 09:00 orcl_ora_5498.trc
-rw-r----- 1 oracle oinstall 903 Jun 10 08:59 orcl_ora_5422.trc
-rw-r----- 1 oracle oinstall 659 Jun 10 08:59 orcl_ora_5394.trc
-rw-r----- 1 oracle oinstall 994 Jun 10 08:59 orcl_ora_5390.trc
-rw-r----- 1 oracle oinstall 1281 Jun 10 08:59 orcl_ora_5388.trc
-rw-r----- 1 oracle oinstall 762 Jun 10 08:59 orcl_ora_5364.trc
-rw-r----- 1 oracle oinstall 722 Jun 10 08:59 orcl_ora_5346.trc
-rw-r----- 1 oracle oinstall 953 Jun 10 08:59 orcl_ora_5334.trc
-rw-r----- 1 oracle oinstall 2923 Jun 10 08:58 orcl_ora_5286.trc
-rw-r----- 1 oracle oinstall 659 Jun 10 08:58 orcl_ora_5260.trc
-rw-r----- 1 oracle oinstall 1066 Jun 10 08:58 orcl_ora_5258.trc
-rw-r----- 1 oracle oinstall 659 Jun 10 08:58 orcl_ora_5205.trc
[oracle@server udump]$ cat orcl_ora_9177.trc
--一些环境信息
/u01/oracle/admin/orcl/udump/orcl_ora_9177.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
ORACLE_HOME = /u01/oracle/product/OraHome
System name: Linux
Node name: server
Release: 2.6.18-274.el5
Version: #1 SMP Fri Jul 8 17:36:59 EDT 2011
Machine: x86_64
Instance name: orcl
Redo thread mounted by this instance: 1
Oracle process number: 15
Unix process pid: 9177, image: oracle@server (TNS V1-V3)
*** 2015-12-06 20:04:48.796
*** ACTION NAME:() 2015-12-06 20:04:48.796
*** MODULE NAME:(SQL*Plus) 2015-12-06 20:04:48.796
*** SERVICE NAME:(SYS$USERS) 2015-12-06 20:04:48.796
*** SESSION ID:(159.5) 2015-12-06 20:04:48.796
Registered qb: SEL$1 0x77a8eae0 (PARSER)
signature (): qb_name=SEL$1 nbfros=3 flg=0
fro(0): flg=4 objn=52978 hint_alias="T1"@"SEL$1"
fro(1): flg=4 objn=52983 hint_alias="T2"@"SEL$1"
fro(2): flg=4 objn=52984 hint_alias="T3"@"SEL$1"
************************** --开始各种尝试改写
Predicate Move-Around (PM)
**************************
PM: Considering predicate move-around in SEL$1 (#0).
PM: Checking validity of predicate move-around in SEL$1 (#0).
CBQT: Validity checks failed for 5p2ahbv0mbgm8.
Query block (0x2ac377a8eae0) before join elimination:
SQL:******* UNPARSED QUERY IS *******
SELECT "T1"."OWNER" "OWNER","T1"."OBJECT_NAME" "OBJECT_NAME","T1"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T1"."OBJECT_ID" "OBJECT_ID","T1"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T1"."OBJECT_TYPE" "OBJECT_TYPE","T1"."CREATED" "CREATED","T1"."LAST_DDL_TIME" "LAST_DDL_TIME","T1"."TIMESTAMP" "TIMESTAMP","T1"."STATUS" "STATUS","T1"."TEMPORARY" "TEMPORARY","T1"."GENERATED" "GENERATED","T1"."SECONDARY" "SECONDARY","T2"."OWNER" "OWNER","T2"."OBJECT_NAME" "OBJECT_NAME","T2"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T2"."OBJECT_ID" "OBJECT_ID","T2"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T2"."OBJECT_TYPE" "OBJECT_TYPE","T2"."CREATED" "CREATED","T2"."LAST_DDL_TIME" "LAST_DDL_TIME","T2"."TIMESTAMP" "TIMESTAMP","T2"."STATUS" "STATUS","T2"."TEMPORARY" "TEMPORARY","T2"."GENERATED" "GENERATED","T2"."SECONDARY" "SECONDARY","T3"."EMPNO" "EMPNO","T3"."ENAME" "ENAME","T3"."JOB" "JOB","T3"."MGR" "MGR","T3"."HIREDATE" "HIREDATE","T3"."SAL" "SAL","T3"."COMM" "COMM","T3"."DEPTNO" "DEPTNO" FROM "DAO"."DAO_OBJECTS1" "T1","DAO"."DAO_OBJECTS2" "T2","DAO"."EMP" "T3" WHERE "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
Query block (0x2ac377a8eae0) unchanged
CVM: Considering view merge in query block SEL$1 (#0)
Query block (0x2ac377a8eae0) before join elimination:
SQL:******* UNPARSED QUERY IS *******
SELECT "T1"."OWNER" "OWNER","T1"."OBJECT_NAME" "OBJECT_NAME","T1"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T1"."OBJECT_ID" "OBJECT_ID","T1"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T1"."OBJECT_TYPE" "OBJECT_TYPE","T1"."CREATED" "CREATED","T1"."LAST_DDL_TIME" "LAST_DDL_TIME","T1"."TIMESTAMP" "TIMESTAMP","T1"."STATUS" "STATUS","T1"."TEMPORARY" "TEMPORARY","T1"."GENERATED" "GENERATED","T1"."SECONDARY" "SECONDARY","T2"."OWNER" "OWNER","T2"."OBJECT_NAME" "OBJECT_NAME","T2"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T2"."OBJECT_ID" "OBJECT_ID","T2"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T2"."OBJECT_TYPE" "OBJECT_TYPE","T2"."CREATED" "CREATED","T2"."LAST_DDL_TIME" "LAST_DDL_TIME","T2"."TIMESTAMP" "TIMESTAMP","T2"."STATUS" "STATUS","T2"."TEMPORARY" "TEMPORARY","T2"."GENERATED" "GENERATED","T2"."SECONDARY" "SECONDARY","T3"."EMPNO" "EMPNO","T3"."ENAME" "ENAME","T3"."JOB" "JOB","T3"."MGR" "MGR","T3"."HIREDATE" "HIREDATE","T3"."SAL" "SAL","T3"."COMM" "COMM","T3"."DEPTNO" "DEPTNO" FROM "DAO"."DAO_OBJECTS1" "T1","DAO"."DAO_OBJECTS2" "T2","DAO"."EMP" "T3" WHERE "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
Query block (0x2ac377a8eae0) unchanged
CBQT: Validity checks failed for 5p2ahbv0mbgm8.
***************
Subquery Unnest
***************
SU: Considering subquery unnesting in query block SEL$1 (#0)
*************************
Set-Join Conversion (SJC)
*************************
SJC: Considering set-join conversion in SEL$1 (#0).
**************************
Predicate Move-Around (PM)
**************************
PM: Considering predicate move-around in SEL$1 (#0).
PM: Checking validity of predicate move-around in SEL$1 (#0).
PM: PM bypassed: Outer query contains no views.
FPD: Considering simple filter push in SEL$1 (#0)
FPD: Current where clause predicates in SEL$1 (#0) :
"T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
kkogcp: try to generate transitive predicate from check constraints for SEL$1 (#0)
predicates with check contraints: "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
after transitive predicate generation: "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
finally: "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
apadrv-start: call(in-use=6160, alloc=16344), compile(in-use=56144, alloc=58808)
kkoqbc-start
: call(in-use=6168, alloc=16344), compile(in-use=57640, alloc=58808)
kkoqbc-subheap (create addr=0x2ac377a8c2c0)
******************************************
Current SQL statement for this session: --当前SQL
select /*+10053 test*/*
from dao_objects1 t1 ,dao_objects2 t2,emp t3
where t1.object_id=t2.object_id
and t2.object_id=t3.empno
*******************************************
--关于改写的各种名词简称
Legend
The following abbreviations are used by optimizer trace.
CBQT - cost-based query transformation
JPPD - join predicate push-down
FPD - filter push-down
PM - predicate move-around
CVM - complex view merging
SPJ - select-project-join
SJC - set join conversion
SU - subquery unnesting
OBYE - order by elimination
ST - star transformation
qb - query block
LB - leaf blocks
DK - distinct keys
LB/K - average number of leaf blocks per key
DB/K - average number of data blocks per key
CLUF - clustering factor
NDV - number of distinct values
Resp - response cost
Card - cardinality
Resc - resource cost
NL - nested loops (join)
SM - sort merge (join)
HA - hash (join)
CPUCSPEED - CPU Speed
IOTFRSPEED - I/O transfer speed
IOSEEKTIM - I/O seek time
SREADTIM - average single block read time
MREADTIM - average multiblock read time
MBRC - average multiblock read count
MAXTHR - maximum I/O system throughput
SLAVETHR - average slave I/O throughput
dmeth - distribution method
1: no partitioning required
2: value partitioned
4: right is random (round-robin)
512: left is random (round-robin)
8: broadcast right and partition left
16: broadcast left and partition right
32: partition left using partitioning of right
64: partition right using partitioning of left
128: use hash partitioning dimension
256: use range partitioning dimension
2048: use list partitioning dimension
1024: run the join in serial
0: invalid distribution method
sel - selectivity
ptn - partition
*******************************************
Peeked values of the binds in SQL statement
*******************************************
***************************************
PARAMETERS USED BY THE OPTIMIZER
********************************
*************************************
PARAMETERS WITH ALTERED VALUES
******************************
*********************************
Bug Fix Control Environment --各种以修复未修复的bug
***************************
fix 4611850 = enabled
fix 4663804 = enabled
fix 4663698 = enabled
fix 4545833 = enabled
fix 3499674 = disabled
fix 4584065 = enabled
fix 4602374 = enabled
fix 4569940 = enabled
fix 4631959 = enabled
fix 4519340 = enabled
fix 4550003 = enabled
fix 4488689 = enabled
fix 3118776 = enabled
fix 4519016 = enabled
fix 4487253 = enabled
fix 4556762 = 15
fix 4728348 = enabled
fix 4723244 = enabled
fix 4554846 = enabled
fix 4175830 = enabled
fix 4722900 = enabled
fix 5094217 = enabled
fix 4904890 = enabled
fix 4483286 = disabled
fix 4969880 = disabled
fix 4711525 = enabled
fix 4717546 = enabled
fix 4904838 = enabled
fix 5005866 = enabled
fix 4600710 = enabled
fix 5129233 = enabled
fix 5195882 = enabled
fix 5084239 = enabled
fix 4595987 = enabled
fix 4134994 = enabled
fix 5104624 = enabled
fix 4908162 = enabled
fix 5015557 = enabled
fix 5263572 = enabled
fix 4483240 = enabled
fix 5099909 = enabled
fix 5650477 = enabled
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fix 5449488 = enabled
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fix 5618040 = enabled
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fix 5220356 = enabled
fix 5611962 = enabled
fix 5741121 = enabled
fix 5547058 = enabled
fix 5762598 = enabled
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fix 5396162 = enabled
fix 5891471 = enabled
fix 4872602 = disabled
fix 5882954 = enabled
fix 5884780 = enabled
fix 5680702 = enabled
fix 5240607 = enabled
fix 4924149 = enabled
fix 4752814 = enabled
fix 4583239 = enabled
fix 5949981 = enabled
fix 5096560 = enabled
fix 5838613 = enabled
fix 5482831 = enabled
fix 5624216 = enabled
fix 5976822 = enabled
fix 5741044 = enabled
fix 5385629 = enabled
fix 5705630 = disabled
fix 5483301 = enabled
fix 6122894 = enabled
fix 5842686 = disabled
fix 6006300 = disabled
fix 6070954 = enabled
fix 2492766 = enabled
fix 6042205 = enabled
fix 5302124 = enabled
fix 6051211 = enabled
fix 5620485 = enabled
fix 4545802 = enabled
fix 4716096 = enabled
fix 5259048 = enabled
fix 6163564 = enabled
fix 6082745 = enabled
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fix 4878299 = enabled
fix 5288623 = enabled
fix 5570494 = enabled
fix 5387148 = enabled
fix 4605810 = enabled
fix 4704779 = enabled
fix 5547895 = enabled
fix 6188881 = enabled
fix 5872956 = enabled
fix 4708389 = enabled
fix 3151991 = enabled
fix 3426050 = enabled
fix 599680 = enabled
fix 5505157 = enabled
fix 5996801 = enabled
fix 5765456 = 0
fix 6494943 = enabled
fix 6251917 = enabled
fix 6087237 = enabled
fix 6239971 = enabled
fix 6062266 = enabled
fix 5520732 = 0
fix 6151963 = enabled
fix 4567767 = enabled
fix 6007259 = enabled
fix 6694548 = enabled
fix 6923730 = 0
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fix 6714199 = enabled
fix 3801750 = enabled
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fix 3056297 = enabled
fix 6440977 = disabled
fix 6904146 = enabled
fix 6221403 = enabled
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fix 6670551 = disabled
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fix 7249095 = enabled
fix 6430500 = disabled
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fix 6282944 = enabled
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fix 7298570 = enabled
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fix 7237571 = enabled
fix 6626018 = disabled
fix 5199213 = enabled
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fix 6469667 = enabled
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fix 6326934 = enabled
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fix 5936366 = enabled
fix 3320140 = enabled
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fix 7281191 = enabled
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fix 6012093 = 1
fix 7512227 = enabled
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fix 8355120 = enabled
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fix 7176746 = enabled
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fix 8544722 = disabled
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fix 4444536 = disabled
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fix 8560951 = disabled
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fix 8371884 = enabled
fix 5099019 = disabled
fix 7289023 = enabled
fix 7148689 = enabled
fix 6766962 = enabled
fix 6688200 = enabled
fix 6671155 = enabled
fix 6656356 = enabled
fix 5554865 = enabled
fix 6503543 = disabled
fix 7032684 = enabled
fix 8855396 = enabled
************************************* --各种隐含参数
PARAMETERS WITH DEFAULT VALUES
******************************
optimizer_mode_hinted = false
optimizer_features_hinted = 0.0.0
parallel_execution_enabled = true
parallel_query_forced_dop = 0
parallel_dml_forced_dop = 0
parallel_ddl_forced_degree = 0
parallel_ddl_forced_instances = 0
_query_rewrite_fudge = 90
optimizer_features_enable = 10.2.0.5
_optimizer_search_limit = 5
cpu_count = 1
active_instance_count = 1
parallel_threads_per_cpu = 2
hash_area_size = 131072
bitmap_merge_area_size = 1048576
sort_area_size = 65536
sort_area_retained_size = 0
_sort_elimination_cost_ratio = 0
_optimizer_block_size = 8192
_sort_multiblock_read_count = 2
_hash_multiblock_io_count = 0
_db_file_optimizer_read_count = 16
_optimizer_max_permutations = 2000
pga_aggregate_target = 194560 KB
_pga_max_size = 204800 KB
_query_rewrite_maxdisjunct = 257
_smm_auto_min_io_size = 56 KB
_smm_auto_max_io_size = 248 KB
_smm_min_size = 194 KB
_smm_max_size = 38912 KB
_smm_px_max_size = 97280 KB
_cpu_to_io = 0
_optimizer_undo_cost_change = 10.2.0.5
parallel_query_mode = enabled
parallel_dml_mode = disabled
parallel_ddl_mode = enabled
optimizer_mode = all_rows
sqlstat_enabled = false
_optimizer_percent_parallel = 101
_always_anti_join = choose
_always_semi_join = choose
_optimizer_mode_force = true
_partition_view_enabled = true
_always_star_transformation = false
_query_rewrite_or_error = false
_hash_join_enabled = true
cursor_sharing = exact
_b_tree_bitmap_plans = true
star_transformation_enabled = false
_optimizer_cost_model = choose
_new_sort_cost_estimate = true
_complex_view_merging = true
_unnest_subquery = true
_eliminate_common_subexpr = true
_pred_move_around = true
_convert_set_to_join = false
_push_join_predicate = true
_push_join_union_view = true
_fast_full_scan_enabled = true
_optim_enhance_nnull_detection = true
_parallel_broadcast_enabled = true
_px_broadcast_fudge_factor = 100
_ordered_nested_loop = true
_no_or_expansion = false
optimizer_index_cost_adj = 100
optimizer_index_caching = 0
_system_index_caching = 0
_disable_datalayer_sampling = false
query_rewrite_enabled = true
query_rewrite_integrity = enforced
_query_cost_rewrite = true
_query_rewrite_2 = true
_query_rewrite_1 = true
_query_rewrite_expression = true
_query_rewrite_jgmigrate = true
_query_rewrite_fpc = true
_query_rewrite_drj = true
_full_pwise_join_enabled = true
_partial_pwise_join_enabled = true
_left_nested_loops_random = true
_improved_row_length_enabled = true
_index_join_enabled = true
_enable_type_dep_selectivity = true
_improved_outerjoin_card = true
_optimizer_adjust_for_nulls = true
_optimizer_degree = 0
_use_column_stats_for_function = true
_subquery_pruning_enabled = true
_subquery_pruning_mv_enabled = false
_or_expand_nvl_predicate = true
_like_with_bind_as_equality = false
_table_scan_cost_plus_one = true
_cost_equality_semi_join = true
_default_non_equality_sel_check = true
_new_initial_join_orders = true
_oneside_colstat_for_equijoins = true
_optim_peek_user_binds = true
_minimal_stats_aggregation = true
_force_temptables_for_gsets = false
workarea_size_policy = auto
_smm_auto_cost_enabled = true
_gs_anti_semi_join_allowed = true
_optim_new_default_join_sel = true
optimizer_dynamic_sampling = 2
_pre_rewrite_push_pred = true
_optimizer_new_join_card_computation = true
_union_rewrite_for_gs = yes_gset_mvs
_generalized_pruning_enabled = true
_optim_adjust_for_part_skews = true
_force_datefold_trunc = false
statistics_level = typical
_optimizer_system_stats_usage = true
skip_unusable_indexes = true
_remove_aggr_subquery = true
_optimizer_push_down_distinct = 0
_dml_monitoring_enabled = true
_optimizer_undo_changes = false
_predicate_elimination_enabled = true
_nested_loop_fudge = 100
_project_view_columns = true
_local_communication_costing_enabled = true
_local_communication_ratio = 50
_query_rewrite_vop_cleanup = true
_slave_mapping_enabled = true
_optimizer_cost_based_transformation = linear
_optimizer_mjc_enabled = true
_right_outer_hash_enable = true
_spr_push_pred_refspr = true
_optimizer_cache_stats = false
_optimizer_cbqt_factor = 50
_optimizer_squ_bottomup = true
_fic_area_size = 131072
_optimizer_skip_scan_enabled = true
_optimizer_cost_filter_pred = false
_optimizer_sortmerge_join_enabled = true
_optimizer_join_sel_sanity_check = true
_mmv_query_rewrite_enabled = true
_bt_mmv_query_rewrite_enabled = true
_add_stale_mv_to_dependency_list = true
_distinct_view_unnesting = false
_optimizer_dim_subq_join_sel = true
_optimizer_disable_strans_sanity_checks = 0
_optimizer_compute_index_stats = true
_push_join_union_view2 = true
_optimizer_ignore_hints = false
_optimizer_random_plan = 0
_query_rewrite_setopgrw_enable = true
_optimizer_correct_sq_selectivity = true
_disable_function_based_index = false
_optimizer_join_order_control = 3
_optimizer_cartesian_enabled = true
_optimizer_starplan_enabled = true
_extended_pruning_enabled = true
_optimizer_push_pred_cost_based = true
_sql_model_unfold_forloops = run_time
_enable_dml_lock_escalation = false
_bloom_filter_enabled = true
_update_bji_ipdml_enabled = 0
_optimizer_extended_cursor_sharing = udo
_dm_max_shared_pool_pct = 1
_optimizer_cost_hjsmj_multimatch = true
_optimizer_transitivity_retain = true
_px_pwg_enabled = true
optimizer_secure_view_merging = true
_optimizer_join_elimination_enabled = true
flashback_table_rpi = non_fbt
_optimizer_cbqt_no_size_restriction = true
_optimizer_enhanced_filter_push = true
_optimizer_filter_pred_pullup = true
_rowsrc_trace_level = 0
_simple_view_merging = true
_optimizer_rownum_pred_based_fkr = true
_optimizer_better_inlist_costing = all
_optimizer_self_induced_cache_cost = false
_optimizer_min_cache_blocks = 10
_optimizer_or_expansion = depth
_optimizer_order_by_elimination_enabled = true
_optimizer_outer_to_anti_enabled = true
_selfjoin_mv_duplicates = true
_dimension_skip_null = true
_force_rewrite_enable = false
_optimizer_star_tran_in_with_clause = true
_optimizer_complex_pred_selectivity = true
_optimizer_connect_by_cost_based = true
_gby_hash_aggregation_enabled = true
_globalindex_pnum_filter_enabled = true
_fix_control_key = 0
_optimizer_skip_scan_guess = false
_enable_row_shipping = false
_row_shipping_threshold = 80
_row_shipping_explain = false
_optimizer_rownum_bind_default = 10
_first_k_rows_dynamic_proration = true
_px_ual_serial_input = true
_with_subquery = OPTIMIZER
_optimizer_native_full_outer_join = off
_optimizer_star_trans_min_cost = 0
_optimizer_star_trans_min_ratio = 0
_optimizer_fkr_index_cost_bias = 10
_optimizer_connect_by_combine_sw = true
_optimizer_use_subheap = true
_optimizer_or_expansion_subheap = true
_optimizer_sortmerge_join_inequality = true
_optimizer_use_histograms = true
_optimizer_enable_density_improvements = false
_mv_generalized_oj_refresh_opt = true
_optimizer_connect_by_cb_whr_only = false
*********************************
Bug Fix Control Environment --各种以修复未修复的bug
***************************
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***************************************
PARAMETERS IN OPT_PARAM HINT --是否使用OPT_PARAM 提示改的参数
****************************
***************************************
Column Usage Monitoring is ON: tracking level = 1
***************************************
****************
QUERY BLOCK TEXT
****************
select /*+10053 test*/*
from dao_objects1 t1 ,dao_objects2 t2,emp t3
where t1.object_id=t2.object_id
and t2.object_id=t3.empno
*********************
QUERY BLOCK SIGNATURE --语句块标记
*********************
qb name was generated
signature (optimizer): qb_name=SEL$1 nbfros=3 flg=0
fro(0): flg=0 objn=52978 hint_alias="T1"@"SEL$1"
fro(1): flg=0 objn=52983 hint_alias="T2"@"SEL$1"
fro(2): flg=0 objn=52984 hint_alias="T3"@"SEL$1"
*****************************
SYSTEM STATISTICS INFORMATION --假设系统统计信息
*****************************
Using NOWORKLOAD Stats
CPUSPEED: 714 millions instruction/sec CPU频率
IOTFRSPEED: 4096 bytes per millisecond (default is 4096) IO传输时间
IOSEEKTIM: 10 milliseconds (default is 10) IO找寻时间
***************************************
BASE STATISTICAL INFORMATION
***********************
Table Stats::
Table: EMP Alias: T3 (NOT ANALYZED)
#Rows: 327 #Blks: 4 AvgRowLen: 100.00
Column (#1): EMPNO(NUMBER) NO STATISTICS (using defaults)
AvgLen: 13.00 NDV: 10 Nulls: 0 Density: 0.097859
***********************
Table Stats::
Table: DAO_OBJECTS2 Alias: T2 (NOT ANALYZED)
#Rows: 58483 #Blks: 716 AvgRowLen: 100.00
Column (#4): OBJECT_ID(NUMBER) NO STATISTICS (using defaults)
AvgLen: 13.00 NDV: 1828 Nulls: 0 Density: 5.4717e-04
***********************
Table Stats::
Table: DAO_OBJECTS1 Alias: T1 (NOT ANALYZED)
#Rows: 58483 #Blks: 716 AvgRowLen: 100.00
Column (#4): OBJECT_ID(NUMBER) NO STATISTICS (using defaults)
AvgLen: 13.00 NDV: 1828 Nulls: 0 Density: 5.4717e-04
Index Stats::
Index: IDX_OBJECTS1 Col#: 4
LVLS: 1 #LB: 112 #DK: 50625 LB/K: 1.00 DB/K: 1.00 CLUF: 1110.00
Index: IDX_OBJECTS2 Col#: 2
LVLS: 1 #LB: 249 #DK: 30262 LB/K: 1.00 DB/K: 1.00 CLUF: 25016.00
Index: IDX_OBJECTS3 Col#: 6
LVLS: 1 #LB: 140 #DK: 41 LB/K: 3.00 DB/K: 53.00 CLUF: 2209.00
Index: IDX_OBJECTS4 Col#: 1
LVLS: 1 #LB: 117 #DK: 27 LB/K: 4.00 DB/K: 49.00 CLUF: 1342.00
***************************************
SINGLE TABLE ACCESS PATH
-----------------------------------------
BEGIN Single Table Cardinality Estimation
-----------------------------------------
*** 2015-12-06 20:04:48.804
** Performing dynamic sampling initial checks. **
** Dynamic sampling initial checks returning TRUE (level = 2).
** Dynamic sampling updated index stats.: IDX_OBJECTS1, blocks=123
** Dynamic sampling updated table stats.: blocks=716
*** 2015-12-06 20:04:48.805
** Generated dynamic sampling query: --这段动态采样
query text :
SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0), COUNT(DISTINCT C3), NVL(SUM(CASE WHEN C3 IS NULL THEN 1 ELSE 0 END),0) FROM (SELECT /*+ NO_PARALLEL("T1") FULL("T1") NO_PARALLEL_INDEX("T1") */ 1 AS C1, 1 AS C2, "T1"."OBJECT_ID" AS C3 FROM "DAO_OBJECTS1" SAMPLE BLOCK (8.798883 , 1) SEED (1) "T1") SAMPLESUB
*** 2015-12-06 20:04:48.811
** Executed dynamic sampling query:
level : 2
sample pct. : 8.798883
actual sample size : 4374
filtered sample card. : 4374
orig. card. : 58483
block cnt. table stat. : 716
block cnt. for sampling: 716
max. sample block cnt. : 64
sample block cnt. : 63
ndv C3 : 4374
scaled : 49710.00
nulls C4 : 0
scaled : 0.00
min. sel. est. : -1.00000000
** Dynamic sampling col. stats.:
Column (#4): OBJECT_ID(NUMBER) Part#: 0
AvgLen: 22.00 NDV: 49710 Nulls: 0 Density: 2.0117e-05
** Using dynamic sampling NULLs estimates.
** Using dynamic sampling NDV estimates.
Scaled NDVs using cardinality = 49711.
** Using dynamic sampling card. : 49711
** Dynamic sampling updated table card.
Table: DAO_OBJECTS1 Alias: T1
Card: Original: 49711 Rounded: 49711 Computed: 49710.86 Non Adjusted: 49710.86
-----------------------------------------
END Single Table Cardinality Estimation
-----------------------------------------
Access Path: TableScan
Cost: 160.86 Resp: 160.86 Degree: 0
Cost_io: 158.00 Cost_cpu: 24486241
Resp_io: 158.00 Resp_cpu: 24486241
Best:: AccessPath: TableScan
Cost: 160.86 Degree: 1 Resp: 160.86 Card: 49710.86 Bytes: 0
***************************************
SINGLE TABLE ACCESS PATH
-----------------------------------------
BEGIN Single Table Cardinality Estimation
-----------------------------------------
*** 2015-12-06 20:04:48.811
** Performing dynamic sampling initial checks. **
** Dynamic sampling initial checks returning TRUE (level = 2).
** Dynamic sampling updated table stats.: blocks=716
*** 2015-12-06 20:04:48.811
** Generated dynamic sampling query:
query text :
SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0), COUNT(DISTINCT C3), NVL(SUM(CASE WHEN C3 IS NULL THEN 1 ELSE 0 END),0) FROM (SELECT /*+ NO_PARALLEL("T2") FULL("T2") NO_PARALLEL_INDEX("T2") */ 1 AS C1, 1 AS C2, "T2"."OBJECT_ID" AS C3 FROM "DAO_OBJECTS2" SAMPLE BLOCK (8.798883 , 1) SEED (1) "T2") SAMPLESUB
*** 2015-12-06 20:04:48.814
** Executed dynamic sampling query:
level : 2
sample pct. : 8.798883
actual sample size : 3720
filtered sample card. : 3720
orig. card. : 58483
block cnt. table stat. : 716
block cnt. for sampling: 716
max. sample block cnt. : 64
sample block cnt. : 63
ndv C3 : 3720
scaled : 42278.00
nulls C4 : 0
scaled : 0.00
min. sel. est. : -1.00000000
** Dynamic sampling col. stats.:
Column (#4): OBJECT_ID(NUMBER) Part#: 0
AvgLen: 22.00 NDV: 42278 Nulls: 0 Density: 2.3653e-05
** Using dynamic sampling NULLs estimates.
** Using dynamic sampling NDV estimates.
Scaled NDVs using cardinality = 42278.
** Using dynamic sampling card. : 42278
** Dynamic sampling updated table card.
Table: DAO_OBJECTS2 Alias: T2
Card: Original: 42278 Rounded: 42278 Computed: 42278.10 Non Adjusted: 42278.10
-----------------------------------------
END Single Table Cardinality Estimation
-----------------------------------------
Access Path: TableScan
Cost: 160.52 Resp: 160.52 Degree: 0
Cost_io: 158.00 Cost_cpu: 21587501
Resp_io: 158.00 Resp_cpu: 21587501
Best:: AccessPath: TableScan
Cost: 160.52 Degree: 1 Resp: 160.52 Card: 42278.10 Bytes: 0
***************************************
SINGLE TABLE ACCESS PATH
-----------------------------------------
BEGIN Single Table Cardinality Estimation
-----------------------------------------
*** 2015-12-06 20:04:48.814
** Performing dynamic sampling initial checks. **
** Dynamic sampling initial checks returning TRUE (level = 2).
** Dynamic sampling updated table stats.: blocks=4
*** 2015-12-06 20:04:48.814
** Generated dynamic sampling query:
query text :
SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0), COUNT(DISTINCT C3), NVL(SUM(CASE WHEN C3 IS NULL THEN 1 ELSE 0 END),0) FROM (SELECT /*+ NO_PARALLEL("T3") FULL("T3") NO_PARALLEL_INDEX("T3") */ 1 AS C1, 1 AS C2, "T3"."EMPNO" AS C3 FROM "EMP" "T3") SAMPLESUB
*** 2015-12-06 20:04:48.814
** Executed dynamic sampling query:
level : 2
sample pct. : 100.000000
actual sample size : 14
filtered sample card. : 14
orig. card. : 327
block cnt. table stat. : 4
block cnt. for sampling: 4
max. sample block cnt. : 64
sample block cnt. : 4
ndv C3 : 14
scaled : 14.00
nulls C4 : 0
scaled : 0.00
min. sel. est. : -1.00000000
** Dynamic sampling col. stats.:
Column (#1): EMPNO(NUMBER) Part#: 0
AvgLen: 22.00 NDV: 14 Nulls: 0 Density: 0.071429
** Using dynamic sampling NULLs estimates.
** Using dynamic sampling NDV estimates.
Scaled NDVs using cardinality = 14.
** Using dynamic sampling card. : 14
** Dynamic sampling updated table card.
Table: EMP Alias: T3
Card: Original: 14 Rounded: 14 Computed: 14.00 Non Adjusted: 14.00
-----------------------------------------
END Single Table Cardinality Estimation
-----------------------------------------
Access Path: TableScan
Cost: 3.00 Resp: 3.00 Degree: 0
Cost_io: 3.00 Cost_cpu: 32546
Resp_io: 3.00 Resp_cpu: 32546
Best:: AccessPath: TableScan
Cost: 3.00 Degree: 1 Resp: 3.00 Card: 14.00 Bytes: 0
***************************************
OPTIMIZER STATISTICS AND COMPUTATIONS --优化器统计信息计算
***************************************
GENERAL PLANS
***************************************
Considering cardinality-based initial join order. --考虑使用基数来决定连接方式
Permutations for Starting Table :0
***********************
Join order[1]: EMP[T3]#0 DAO_OBJECTS2[T2]#1 DAO_OBJECTS1[T1]#2
***************
Now joining: DAO_OBJECTS2[T2]#1 如果使用NL
***************
NL Join
Outer table: Card: 14.00 Cost: 3.00 Resp: 3.00 Degree: 1 Bytes: 87
Inner table: DAO_OBJECTS2 Alias: T2
Access Path: TableScan
NL Join: Cost: 2232.28 Resp: 2232.28 Degree: 1
Cost_io: 2197.00 Cost_cpu: 302258680
Resp_io: 2197.00 Resp_cpu: 302258680
Best NL cost: 2232.28
resc: 2232.28 resc_io: 2197.00 resc_cpu: 302258680
resp: 2232.28 resp_io: 2197.00 resp_cpu: 302258680
Join Card: 14.00 = outer (14.00) * inner (42278.10) * sel (2.3653e-05)
Join Card - Rounded: 14 Computed: 14.00
--如果使用sort merge
SM Join
Outer table:
resc: 3.00 card 14.00 bytes: 87 deg: 1 resp: 3.00
Inner table: DAO_OBJECTS2 Alias: T2
resc: 160.52 card: 42278.10 bytes: 177 deg: 1 resp: 160.52
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1 Row size: 106 Total Rows: 14
Initial runs: 1 Merge passes: 0 IO Cost / pass: 0
Total IO sort cost: 0 Total CPU sort cost: 8569266
Total Temp space used: 0
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1062 Row size: 205 Total Rows: 42278
Initial runs: 2 Merge passes: 1 IO Cost / pass: 576
Total IO sort cost: 1638 Total CPU sort cost: 63992179
Total Temp space used: 17785000
SM join: Resc: 1809.99 Resp: 1809.99 [multiMatchCost=0.00]
SM cost: 1809.99
resc: 1809.99 resc_io: 1799.00 resc_cpu: 94181492
resp: 1809.99 resp_io: 1799.00 resp_cpu: 94181492
--如果使用hash join
HA Join
Outer table:
resc: 3.00 card 14.00 bytes: 87 deg: 1 resp: 3.00
Inner table: DAO_OBJECTS2 Alias: T2
resc: 160.52 card: 42278.10 bytes: 177 deg: 1 resp: 160.52
using dmeth: 2 #groups: 1
Cost per ptn: 0.99 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 1 probefrag: 976 ppasses: 1
Hash join: Resc: 164.52 Resp: 164.52 [multiMatchCost=0.00]
HA cost: 164.52
resc: 164.52 resc_io: 161.00 resc_cpu: 30133379
resp: 164.52 resp_io: 161.00 resp_cpu: 30133379
Best:: JoinMethod: Hash
Cost: 164.52 Degree: 1 Resp: 164.52 Card: 14.00 Bytes: 264
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
Outer table: Card: 14.00 Cost: 164.52 Resp: 164.52 Degree: 1 Bytes: 264
Inner table: DAO_OBJECTS1 Alias: T1
Access Path: TableScan
NL Join: Cost: 2398.53 Resp: 2398.53 Degree: 1
Cost_io: 2355.00 Cost_cpu: 372940754
Resp_io: 2355.00 Resp_cpu: 372940754
Access Path: index (AllEqJoinGuess)
Index: IDX_OBJECTS1
resc_io: 2.00 resc_cpu: 16273
ix_sel: 2.0117e-05 ix_sel_with_filters: 2.0117e-05
NL Join: Cost: 192.54 Resp: 192.54 Degree: 1
Cost_io: 189.00 Cost_cpu: 30361199
Resp_io: 189.00 Resp_cpu: 30361199
Best NL cost: 192.54
resc: 192.54 resc_io: 189.00 resc_cpu: 30361199
resp: 192.54 resp_io: 189.00 resp_cpu: 30361199
Join Card: 14.00 = outer (14.00) * inner (49710.86) * sel (2.0117e-05)
Join Card - Rounded: 14 Computed: 14.00
SM Join
Outer table:
resc: 164.52 card 14.00 bytes: 264 deg: 1 resp: 164.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1 Row size: 301 Total Rows: 14
Initial runs: 1 Merge passes: 0 IO Cost / pass: 0
Total IO sort cost: 0 Total CPU sort cost: 8569266
Total Temp space used: 0
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1248 Row size: 205 Total Rows: 49711
Initial runs: 2 Merge passes: 1 IO Cost / pass: 676
Total IO sort cost: 1924 Total CPU sort cost: 74242412
Total Temp space used: 20898000
SM join: Resc: 2259.04 Resp: 2259.04 [multiMatchCost=0.00]
SM cost: 2259.04
resc: 2259.04 resc_io: 2243.00 resc_cpu: 137431298
resp: 2259.04 resp_io: 2243.00 resp_cpu: 137431298
HA Join
Outer table:
resc: 164.52 card 14.00 bytes: 264 deg: 1 resp: 164.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
Cost per ptn: 1.08 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 1 probefrag: 1147 ppasses: 1
Hash join: Resc: 326.46 Resp: 326.46 [multiMatchCost=0.00]
HA cost: 326.46
resc: 326.46 resc_io: 319.00 resc_cpu: 63876252
resp: 326.46 resp_io: 319.00 resp_cpu: 63876252
Best:: JoinMethod: NestedLoop
Cost: 192.54 Degree: 1 Resp: 192.54 Card: 14.00 Bytes: 441
***********************
Best so far: Table#: 0 cost: 3.0038 card: 14.0000 bytes: 1218
Table#: 1 cost: 164.5174 card: 14.0000 bytes: 3696
Table#: 2 cost: 192.5440 card: 14.0003 bytes: 6174
***********************
Join order[2]: EMP[T3]#0 DAO_OBJECTS1[T1]#2 DAO_OBJECTS2[T2]#1 --第二种连接顺序
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
Outer table: Card: 14.00 Cost: 3.00 Resp: 3.00 Degree: 1 Bytes: 87
Inner table: DAO_OBJECTS1 Alias: T1
Access Path: TableScan
NL Join: Cost: 2237.02 Resp: 2237.02 Degree: 1
Cost_io: 2197.00 Cost_cpu: 342839920
Resp_io: 2197.00 Resp_cpu: 342839920
Best NL cost: 2237.02
resc: 2237.02 resc_io: 2197.00 resc_cpu: 342839920
resp: 2237.02 resp_io: 2197.00 resp_cpu: 342839920
Join Card: 695952.00 = outer (14.00) * inner (49710.86) * sel (1)
Join Card - Rounded: 695952 Computed: 695952.00
Join order aborted: cost > best plan cost
***********************
***********************
Join order[3]: DAO_OBJECTS2[T2]#1 EMP[T3]#0 DAO_OBJECTS1[T1]#2 --第三种连接顺序
***************
Now joining: EMP[T3]#0
***************
NL Join
Outer table: Card: 42278.10 Cost: 160.52 Resp: 160.52 Degree: 1 Bytes: 177
Inner table: EMP Alias: T3
Access Path: TableScan
NL Join: Cost: 37316.14 Resp: 37316.14 Degree: 1
Cost_io: 37153.00 Cost_cpu: 1397557142
Resp_io: 37153.00 Resp_cpu: 1397557142
Best NL cost: 37316.14
resc: 37316.14 resc_io: 37153.00 resc_cpu: 1397557142
resp: 37316.14 resp_io: 37153.00 resp_cpu: 1397557142
Join Card: 14.00 = outer (42278.10) * inner (14.00) * sel (2.3653e-05)
Join Card - Rounded: 14 Computed: 14.00
SM Join
Outer table:
resc: 160.52 card 42278.10 bytes: 177 deg: 1 resp: 160.52
Inner table: EMP Alias: T3
resc: 3.00 card: 14.00 bytes: 87 deg: 1 resp: 3.00
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1062 Row size: 205 Total Rows: 42278
Initial runs: 2 Merge passes: 1 IO Cost / pass: 576
Total IO sort cost: 1638 Total CPU sort cost: 63992179
Total Temp space used: 17785000
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1 Row size: 106 Total Rows: 14
Initial runs: 1 Merge passes: 0 IO Cost / pass: 0
Total IO sort cost: 0 Total CPU sort cost: 8569266
Total Temp space used: 0
SM join: Resc: 1809.99 Resp: 1809.99 [multiMatchCost=0.00]
SM cost: 1809.99
resc: 1809.99 resc_io: 1799.00 resc_cpu: 94181492
resp: 1809.99 resp_io: 1799.00 resp_cpu: 94181492
HA Join
Outer table:
resc: 160.52 card 42278.10 bytes: 177 deg: 1 resp: 160.52
Inner table: EMP Alias: T3
resc: 3.00 card: 14.00 bytes: 87 deg: 1 resp: 3.00
using dmeth: 2 #groups: 1
Cost per ptn: 380.71 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 976 probefrag: 1 ppasses: 1
Hash join: Resc: 544.23 Resp: 544.23 [multiMatchCost=0.00]
HA Join (swap)
Outer table:
resc: 3.00 card 14.00 bytes: 87 deg: 1 resp: 3.00
Inner table: DAO_OBJECTS2 Alias: T2
resc: 160.52 card: 42278.10 bytes: 177 deg: 1 resp: 160.52
using dmeth: 2 #groups: 1
Cost per ptn: 0.99 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 1 probefrag: 976 ppasses: 1
Hash join: Resc: 164.52 Resp: 164.52 [multiMatchCost=0.00]
HA cost: 164.52
resc: 164.52 resc_io: 161.00 resc_cpu: 30133379
resp: 164.52 resp_io: 161.00 resp_cpu: 30133379
Best:: JoinMethod: Hash
Cost: 164.52 Degree: 1 Resp: 164.52 Card: 14.00 Bytes: 264
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
Outer table: Card: 14.00 Cost: 164.52 Resp: 164.52 Degree: 1 Bytes: 264
Inner table: DAO_OBJECTS1 Alias: T1
Access Path: TableScan
NL Join: Cost: 2398.53 Resp: 2398.53 Degree: 1
Cost_io: 2355.00 Cost_cpu: 372940754
Resp_io: 2355.00 Resp_cpu: 372940754
Access Path: index (AllEqJoinGuess)
Index: IDX_OBJECTS1
resc_io: 2.00 resc_cpu: 16273
ix_sel: 2.0117e-05 ix_sel_with_filters: 2.0117e-05
NL Join: Cost: 192.54 Resp: 192.54 Degree: 1
Cost_io: 189.00 Cost_cpu: 30361199
Resp_io: 189.00 Resp_cpu: 30361199
Best NL cost: 192.54
resc: 192.54 resc_io: 189.00 resc_cpu: 30361199
resp: 192.54 resp_io: 189.00 resp_cpu: 30361199
Join Card: 14.00 = outer (14.00) * inner (49710.86) * sel (2.0117e-05)
Join Card - Rounded: 14 Computed: 14.00
SM Join
Outer table:
resc: 164.52 card 14.00 bytes: 264 deg: 1 resp: 164.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1 Row size: 301 Total Rows: 14
Initial runs: 1 Merge passes: 0 IO Cost / pass: 0
Total IO sort cost: 0 Total CPU sort cost: 8569266
Total Temp space used: 0
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1248 Row size: 205 Total Rows: 49711
Initial runs: 2 Merge passes: 1 IO Cost / pass: 676
Total IO sort cost: 1924 Total CPU sort cost: 74242412
Total Temp space used: 20898000
SM join: Resc: 2259.04 Resp: 2259.04 [multiMatchCost=0.00]
SM cost: 2259.04
resc: 2259.04 resc_io: 2243.00 resc_cpu: 137431298
resp: 2259.04 resp_io: 2243.00 resp_cpu: 137431298
HA Join
Outer table:
resc: 164.52 card 14.00 bytes: 264 deg: 1 resp: 164.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
Cost per ptn: 1.08 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 1 probefrag: 1147 ppasses: 1
Hash join: Resc: 326.46 Resp: 326.46 [multiMatchCost=0.00]
HA cost: 326.46
resc: 326.46 resc_io: 319.00 resc_cpu: 63876252
resp: 326.46 resp_io: 319.00 resp_cpu: 63876252
Join order aborted: cost > best plan cost
***********************
***********************
Join order[4]: DAO_OBJECTS2[T2]#1 DAO_OBJECTS1[T1]#2 EMP[T3]#0 --第四重连接顺序
***************
Now joining: DAO_OBJECTS1[T1]#2
***************
NL Join
Outer table: Card: 42278.10 Cost: 160.52 Resp: 160.52 Degree: 1 Bytes: 177
Inner table: DAO_OBJECTS1 Alias: T1
Access Path: TableScan
NL Join: Cost: 6742794.61 Resp: 6742794.61 Degree: 1
Cost_io: 6621951.00 Cost_cpu: 1035250886190
Resp_io: 6621951.00 Resp_cpu: 1035250886190
Access Path: index (AllEqJoinGuess)
Index: IDX_OBJECTS1
resc_io: 2.00 resc_cpu: 16273
ix_sel: 2.0117e-05 ix_sel_with_filters: 2.0117e-05
NL Join: Cost: 84796.83 Resp: 84796.83 Degree: 1
Cost_io: 84714.00 Cost_cpu: 709572322
Resp_io: 84714.00 Resp_cpu: 709572322
Best NL cost: 84796.83
resc: 84796.83 resc_io: 84714.00 resc_cpu: 709572322
resp: 84796.83 resp_io: 84714.00 resp_cpu: 709572322
Join Card: 42278.82 = outer (42278.10) * inner (49710.86) * sel (2.0117e-05)
Join Card - Rounded: 42279 Computed: 42278.82
SM Join
Outer table:
resc: 160.52 card 42278.10 bytes: 177 deg: 1 resp: 160.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1062 Row size: 205 Total Rows: 42278
Initial runs: 2 Merge passes: 1 IO Cost / pass: 576
Total IO sort cost: 1638 Total CPU sort cost: 63992179
Total Temp space used: 17785000
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1248 Row size: 205 Total Rows: 49711
Initial runs: 2 Merge passes: 1 IO Cost / pass: 676
Total IO sort cost: 1924 Total CPU sort cost: 74242412
Total Temp space used: 20898000
SM join: Resc: 3899.51 Resp: 3899.51 [multiMatchCost=0.00]
SM cost: 3899.51
resc: 3899.51 resc_io: 3878.00 resc_cpu: 184308333
resp: 3899.51 resp_io: 3878.00 resp_cpu: 184308333
HA Join
Outer table:
resc: 160.52 card 42278.10 bytes: 177 deg: 1 resp: 160.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
Cost per ptn: 825.42 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 976 probefrag: 1147 ppasses: 1
Hash join: Resc: 1146.80 Resp: 1146.80 [multiMatchCost=0.00]
HA cost: 1146.80
resc: 1146.80 resc_io: 1138.00 resc_cpu: 75350579
resp: 1146.80 resp_io: 1138.00 resp_cpu: 75350579
Join order aborted: cost > best plan cost
***********************
***********************
Join order[5]: DAO_OBJECTS1[T1]#2 EMP[T3]#0 DAO_OBJECTS2[T2]#1
***************
Now joining: EMP[T3]#0
***************
NL Join
Outer table: Card: 49710.86 Cost: 160.86 Resp: 160.86 Degree: 1 Bytes: 177
Inner table: EMP Alias: T3
Access Path: TableScan
NL Join: Cost: 43848.71 Resp: 43848.71 Degree: 1
Cost_io: 43657.00 Cost_cpu: 1642368516
Resp_io: 43657.00 Resp_cpu: 1642368516
Best NL cost: 43848.71
resc: 43848.71 resc_io: 43657.00 resc_cpu: 1642368516
resp: 43848.71 resp_io: 43657.00 resp_cpu: 1642368516
Join Card: 695952.00 = outer (49710.86) * inner (14.00) * sel (1)
Join Card - Rounded: 695952 Computed: 695952.00
Join order aborted: cost > best plan cost
***********************
***********************
Join order[6]: DAO_OBJECTS1[T1]#2 DAO_OBJECTS2[T2]#1 EMP[T3]#0
***************
Now joining: DAO_OBJECTS2[T2]#1
***************
NL Join
Outer table: Card: 49710.86 Cost: 160.86 Resp: 160.86 Degree: 1 Bytes: 177
Inner table: DAO_OBJECTS2 Alias: T2
Access Path: TableScan
NL Join: Cost: 7911414.25 Resp: 7911414.25 Degree: 1
Cost_io: 7786145.00 Cost_cpu: 1073164727320
Resp_io: 7786145.00 Resp_cpu: 1073164727320
Best NL cost: 7911414.25
resc: 7911414.25 resc_io: 7786145.00 resc_cpu: 1073164727320
resp: 7911414.25 resp_io: 7786145.00 resp_cpu: 1073164727320
Join Card: 42278.82 = outer (49710.86) * inner (42278.10) * sel (2.0117e-05)
Join Card - Rounded: 42279 Computed: 42278.82
SM Join
Outer table:
resc: 160.86 card 49710.86 bytes: 177 deg: 1 resp: 160.86
Inner table: DAO_OBJECTS2 Alias: T2
resc: 160.52 card: 42278.10 bytes: 177 deg: 1 resp: 160.52
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1248 Row size: 205 Total Rows: 49711
Initial runs: 2 Merge passes: 1 IO Cost / pass: 676
Total IO sort cost: 1924 Total CPU sort cost: 74242412
Total Temp space used: 20898000
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1062 Row size: 205 Total Rows: 42278
Initial runs: 2 Merge passes: 1 IO Cost / pass: 576
Total IO sort cost: 1638 Total CPU sort cost: 63992179
Total Temp space used: 17785000
SM join: Resc: 3899.51 Resp: 3899.51 [multiMatchCost=0.00]
SM cost: 3899.51
resc: 3899.51 resc_io: 3878.00 resc_cpu: 184308333
resp: 3899.51 resp_io: 3878.00 resp_cpu: 184308333
SM Join (with index on outer)
Access Path: index (FullScan)
Index: IDX_OBJECTS1
resc_io: 1234.00 resc_cpu: 38656607
ix_sel: 1 ix_sel_with_filters: 1
Cost: 1238.51 Resp: 1238.51 Degree: 1
Outer table:
resc: 1238.51 card 49710.86 bytes: 177 deg: 1 resp: 1238.51
Inner table: DAO_OBJECTS2 Alias: T2
resc: 160.52 card: 42278.10 bytes: 177 deg: 1 resp: 160.52
using dmeth: 2 #groups: 1
SORT resource Sort statistics
Sort width: 226 Area size: 198656 Max Area size: 39845888
Degree: 1
Blocks to Sort: 1062 Row size: 205 Total Rows: 42278
Initial runs: 2 Merge passes: 1 IO Cost / pass: 576
Total IO sort cost: 1638 Total CPU sort cost: 63992179
Total Temp space used: 17785000
SM join: Resc: 3044.50 Resp: 3044.50 [multiMatchCost=0.00]
HA Join
Outer table:
resc: 160.86 card 49710.86 bytes: 177 deg: 1 resp: 160.86
Inner table: DAO_OBJECTS2 Alias: T2
resc: 160.52 card: 42278.10 bytes: 177 deg: 1 resp: 160.52
using dmeth: 2 #groups: 1
Cost per ptn: 825.37 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 1147 probefrag: 976 ppasses: 1
Hash join: Resc: 1146.75 Resp: 1146.75 [multiMatchCost=0.00]
HA Join (swap)
Outer table:
resc: 160.52 card 42278.10 bytes: 177 deg: 1 resp: 160.52
Inner table: DAO_OBJECTS1 Alias: T1
resc: 160.86 card: 49710.86 bytes: 177 deg: 1 resp: 160.86
using dmeth: 2 #groups: 1
Cost per ptn: 825.42 #ptns: 1
hash_area: 124 (max=9728) buildfrag: 976 probefrag: 1147 ppasses: 1
Hash join: Resc: 1146.80 Resp: 1146.80 [multiMatchCost=0.00]
HA cost: 1146.80
resc: 1146.80 resc_io: 1138.00 resc_cpu: 75350579
resp: 1146.80 resp_io: 1138.00 resp_cpu: 75350579
Join order aborted: cost > best plan cost
***********************
(newjo-stop-1) k:0, spcnt:0, perm:6, maxperm:2000
*********************************
Number of join permutations tried: 6
*********************************
(newjo-save) [0 1 2 ]
Final - All Rows Plan: Best join order: 1
Cost: 192.5440 Degree: 1 Card: 14.0000 Bytes: 6174
Resc: 192.5440 Resc_io: 189.0000 Resc_cpu: 30361199
Resp: 192.5440 Resp_io: 189.0000 Resc_cpu: 30361199
kkoipt: Query block SEL$1 (#0)
******* UNPARSED QUERY IS *******
SELECT "T1"."OWNER" "OWNER","T1"."OBJECT_NAME" "OBJECT_NAME","T1"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T1"."OBJECT_ID" "OBJECT_ID","T1"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T1"."OBJECT_TYPE" "OBJECT_TYPE","T1"."CREATED" "CREATED","T1"."LAST_DDL_TIME" "LAST_DDL_TIME","T1"."TIMESTAMP" "TIMESTAMP","T1"."STATUS" "STATUS","T1"."TEMPORARY" "TEMPORARY","T1"."GENERATED" "GENERATED","T1"."SECONDARY" "SECONDARY","T2"."OWNER" "OWNER","T2"."OBJECT_NAME" "OBJECT_NAME","T2"."SUBOBJECT_NAME" "SUBOBJECT_NAME","T2"."OBJECT_ID" "OBJECT_ID","T2"."DATA_OBJECT_ID" "DATA_OBJECT_ID","T2"."OBJECT_TYPE" "OBJECT_TYPE","T2"."CREATED" "CREATED","T2"."LAST_DDL_TIME" "LAST_DDL_TIME","T2"."TIMESTAMP" "TIMESTAMP","T2"."STATUS" "STATUS","T2"."TEMPORARY" "TEMPORARY","T2"."GENERATED" "GENERATED","T2"."SECONDARY" "SECONDARY","T3"."EMPNO" "EMPNO","T3"."ENAME" "ENAME","T3"."JOB" "JOB","T3"."MGR" "MGR","T3"."HIREDATE" "HIREDATE","T3"."SAL" "SAL","T3"."COMM" "COMM","T3"."DEPTNO" "DEPTNO" FROM "DAO"."DAO_OBJECTS1" "T1","DAO"."DAO_OBJECTS2" "T2","DAO"."EMP" "T3" WHERE "T1"."OBJECT_ID"="T2"."OBJECT_ID" AND "T2"."OBJECT_ID"="T3"."EMPNO"
kkoqbc-subheap (delete addr=0x2ac377a8c2c0, in-use=35728, alloc=36920)
kkoqbc-end
: call(in-use=85552, alloc=147392), compile(in-use=61960, alloc=62240)
apadrv-end: call(in-use=85552, alloc=147392), compile(in-use=63032, alloc=66384)
sql_id=5p2ahbv0mbgm8.
Current SQL statement for this session:
select /*+10053 test*/*
from dao_objects1 t1 ,dao_objects2 t2,emp t3
where t1.object_id=t2.object_id
and t2.object_id=t3.empno
============
Plan Table --定下的执行计划
============
---------------------------------------------------+-----------------------------------+
| Id | Operation | Name | Rows | Bytes | Cost | Time |
---------------------------------------------------+-----------------------------------+
| 0 | SELECT STATEMENT | | | | 193 | |
| 1 | TABLE ACCESS BY INDEX ROWID | DAO_OBJECTS1| 1 | 177 | 2 | 00:00:01 |
| 2 | NESTED LOOPS | | 14 | 6174 | 193 | 00:00:03 |
| 3 | HASH JOIN | | 14 | 3696 | 165 | 00:00:02 |
| 4 | TABLE ACCESS FULL | EMP | 14 | 1218 | 3 | 00:00:01 |
| 5 | TABLE ACCESS FULL | DAO_OBJECTS2| 41K | 7308K | 161 | 00:00:02 |
| 6 | INDEX RANGE SCAN | IDX_OBJECTS1| 1 | | 1 | 00:00:01 |
---------------------------------------------------+-----------------------------------+
Predicate Information:
----------------------
3 - access("T2"."OBJECT_ID"="T3"."EMPNO")
6 - access("T1"."OBJECT_ID"="T2"."OBJECT_ID")
Content of other_xml column
===========================
db_version : 10.2.0.5
parse_schema : DAO
dynamic_sampling: yes
plan_hash : 3860464216
Outline Data:
/*+
BEGIN_OUTLINE_DATA
IGNORE_OPTIM_EMBEDDED_HINTS
OPTIMIZER_FEATURES_ENABLE('10.2.0.5')
ALL_ROWS
OUTLINE_LEAF(@"SEL$1")
FULL(@"SEL$1" "T3"@"SEL$1")
FULL(@"SEL$1" "T2"@"SEL$1")
INDEX(@"SEL$1" "T1"@"SEL$1" ("DAO_OBJECTS1"."OBJECT_ID"))
LEADING(@"SEL$1" "T3"@"SEL$1" "T2"@"SEL$1" "T1"@"SEL$1")
USE_HASH(@"SEL$1" "T2"@"SEL$1")
USE_NL(@"SEL$1" "T1"@"SEL$1")
END_OUTLINE_DATA
*/
Optimizer environment:
optimizer_mode_hinted = false
optimizer_features_hinted = 0.0.0
parallel_execution_enabled = true
parallel_query_forced_dop = 0
parallel_dml_forced_dop = 0
parallel_ddl_forced_degree = 0
parallel_ddl_forced_instances = 0
_query_rewrite_fudge = 90
optimizer_features_enable = 10.2.0.5
_optimizer_search_limit = 5
cpu_count = 1
active_instance_count = 1
parallel_threads_per_cpu = 2
hash_area_size = 131072
bitmap_merge_area_size = 1048576
sort_area_size = 65536
sort_area_retained_size = 0
_sort_elimination_cost_ratio = 0
_optimizer_block_size = 8192
_sort_multiblock_read_count = 2
_hash_multiblock_io_count = 0
_db_file_optimizer_read_count = 16
_optimizer_max_permutations = 2000
pga_aggregate_target = 194560 KB
_pga_max_size = 204800 KB
_query_rewrite_maxdisjunct = 257
_smm_auto_min_io_size = 56 KB
_smm_auto_max_io_size = 248 KB
_smm_min_size = 194 KB
_smm_max_size = 38912 KB
_smm_px_max_size = 97280 KB
_cpu_to_io = 0
_optimizer_undo_cost_change = 10.2.0.5
parallel_query_mode = enabled
parallel_dml_mode = disabled
parallel_ddl_mode = enabled
optimizer_mode = all_rows
sqlstat_enabled = false
_optimizer_percent_parallel = 101
_always_anti_join = choose
_always_semi_join = choose
_optimizer_mode_force = true
_partition_view_enabled = true
_always_star_transformation = false
_query_rewrite_or_error = false
_hash_join_enabled = true
cursor_sharing = exact
_b_tree_bitmap_plans = true
star_transformation_enabled = false
_optimizer_cost_model = choose
_new_sort_cost_estimate = true
_complex_view_merging = true
_unnest_subquery = true
_eliminate_common_subexpr = true
_pred_move_around = true
_convert_set_to_join = false
_push_join_predicate = true
_push_join_union_view = true
_fast_full_scan_enabled = true
_optim_enhance_nnull_detection = true
_parallel_broadcast_enabled = true
_px_broadcast_fudge_factor = 100
_ordered_nested_loop = true
_no_or_expansion = false
optimizer_index_cost_adj = 100
optimizer_index_caching = 0
_system_index_caching = 0
_disable_datalayer_sampling = false
query_rewrite_enabled = true
query_rewrite_integrity = enforced
_query_cost_rewrite = true
_query_rewrite_2 = true
_query_rewrite_1 = true
_query_rewrite_expression = true
_query_rewrite_jgmigrate = true
_query_rewrite_fpc = true
_query_rewrite_drj = true
_full_pwise_join_enabled = true
_partial_pwise_join_enabled = true
_left_nested_loops_random = true
_improved_row_length_enabled = true
_index_join_enabled = true
_enable_type_dep_selectivity = true
_improved_outerjoin_card = true
_optimizer_adjust_for_nulls = true
_optimizer_degree = 0
_use_column_stats_for_function = true
_subquery_pruning_enabled = true
_subquery_pruning_mv_enabled = false
_or_expand_nvl_predicate = true
_like_with_bind_as_equality = false
_table_scan_cost_plus_one = true
_cost_equality_semi_join = true
_default_non_equality_sel_check = true
_new_initial_join_orders = true
_oneside_colstat_for_equijoins = true
_optim_peek_user_binds = true
_minimal_stats_aggregation = true
_force_temptables_for_gsets = false
workarea_size_policy = auto
_smm_auto_cost_enabled = true
_gs_anti_semi_join_allowed = true
_optim_new_default_join_sel = true
optimizer_dynamic_sampling = 2
_pre_rewrite_push_pred = true
_optimizer_new_join_card_computation = true
_union_rewrite_for_gs = yes_gset_mvs
_generalized_pruning_enabled = true
_optim_adjust_for_part_skews = true
_force_datefold_trunc = false
statistics_level = typical
_optimizer_system_stats_usage = true
skip_unusable_indexes = true
_remove_aggr_subquery = true
_optimizer_push_down_distinct = 0
_dml_monitoring_enabled = true
_optimizer_undo_changes = false
_predicate_elimination_enabled = true
_nested_loop_fudge = 100
_project_view_columns = true
_local_communication_costing_enabled = true
_local_communication_ratio = 50
_query_rewrite_vop_cleanup = true
_slave_mapping_enabled = true
_optimizer_cost_based_transformation = linear
_optimizer_mjc_enabled = true
_right_outer_hash_enable = true
_spr_push_pred_refspr = true
_optimizer_cache_stats = false
_optimizer_cbqt_factor = 50
_optimizer_squ_bottomup = true
_fic_area_size = 131072
_optimizer_skip_scan_enabled = true
_optimizer_cost_filter_pred = false
_optimizer_sortmerge_join_enabled = true
_optimizer_join_sel_sanity_check = true
_mmv_query_rewrite_enabled = true
_bt_mmv_query_rewrite_enabled = true
_add_stale_mv_to_dependency_list = true
_distinct_view_unnesting = false
_optimizer_dim_subq_join_sel = true
_optimizer_disable_strans_sanity_checks = 0
_optimizer_compute_index_stats = true
_push_join_union_view2 = true
_optimizer_ignore_hints = false
_optimizer_random_plan = 0
_query_rewrite_setopgrw_enable = true
_optimizer_correct_sq_selectivity = true
_disable_function_based_index = false
_optimizer_join_order_control = 3
_optimizer_cartesian_enabled = true
_optimizer_starplan_enabled = true
_extended_pruning_enabled = true
_optimizer_push_pred_cost_based = true
_sql_model_unfold_forloops = run_time
_enable_dml_lock_escalation = false
_bloom_filter_enabled = true
_update_bji_ipdml_enabled = 0
_optimizer_extended_cursor_sharing = udo
_dm_max_shared_pool_pct = 1
_optimizer_cost_hjsmj_multimatch = true
_optimizer_transitivity_retain = true
_px_pwg_enabled = true
optimizer_secure_view_merging = true
_optimizer_join_elimination_enabled = true
flashback_table_rpi = non_fbt
_optimizer_cbqt_no_size_restriction = true
_optimizer_enhanced_filter_push = true
_optimizer_filter_pred_pullup = true
_rowsrc_trace_level = 0
_simple_view_merging = true
_optimizer_rownum_pred_based_fkr = true
_optimizer_better_inlist_costing = all
_optimizer_self_induced_cache_cost = false
_optimizer_min_cache_blocks = 10
_optimizer_or_expansion = depth
_optimizer_order_by_elimination_enabled = true
_optimizer_outer_to_anti_enabled = true
_selfjoin_mv_duplicates = true
_dimension_skip_null = true
_force_rewrite_enable = false
_optimizer_star_tran_in_with_clause = true
_optimizer_complex_pred_selectivity = true
_optimizer_connect_by_cost_based = true
_gby_hash_aggregation_enabled = true
_globalindex_pnum_filter_enabled = true
_fix_control_key = 0
_optimizer_skip_scan_guess = false
_enable_row_shipping = false
_row_shipping_threshold = 80
_row_shipping_explain = false
_optimizer_rownum_bind_default = 10
_first_k_rows_dynamic_proration = true
_px_ual_serial_input = true
_with_subquery = OPTIMIZER
_optimizer_native_full_outer_join = off
_optimizer_star_trans_min_cost = 0
_optimizer_star_trans_min_ratio = 0
_optimizer_fkr_index_cost_bias = 10
_optimizer_connect_by_combine_sw = true
_optimizer_use_subheap = true
_optimizer_or_expansion_subheap = true
_optimizer_sortmerge_join_inequality = true
_optimizer_use_histograms = true
_optimizer_enable_density_improvements = false
_mv_generalized_oj_refresh_opt = true
_optimizer_connect_by_cb_whr_only = false
*********************************
Bug Fix Control Environment
***************************
fix 4611850 = enabled
fix 4663804 = enabled
fix 4663698 = enabled
fix 4545833 = enabled
fix 3499674 = disabled
fix 4584065 = enabled
fix 4602374 = enabled
fix 4569940 = enabled
fix 4631959 = enabled
fix 4519340 = enabled
fix 4550003 = enabled
fix 4488689 = enabled
fix 3118776 = enabled
fix 4519016 = enabled
fix 4487253 = enabled
fix 4556762 = 15
fix 4728348 = enabled
fix 4723244 = enabled
fix 4554846 = enabled
fix 4175830 = enabled
fix 4722900 = enabled
fix 5094217 = enabled
fix 4904890 = enabled
fix 4483286 = disabled
fix 4969880 = disabled
fix 4711525 = enabled
fix 4717546 = enabled
fix 4904838 = enabled
fix 5005866 = enabled
fix 4600710 = enabled
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Query Block Registry:
*********************
SEL$1 0x77a8eae0 (PARSER) [FINAL]
Optimizer State Dump: call(in-use=98216, alloc=147392), compile(in-use=133624, alloc=181112)
