INSERT INTO ATTEMPT_RCO (
ID
,USER_ID
,ICR_ID
,RCO_ID
,RT_TIME
,RT_STATUS
,RT_SCORE
,CLASSROOM_ID
,START_DATE
,END_DATE
,ATTEMPT_NUM
)
VALUES (
ATTEMPT_RCO_SEQ.NEXTVAL
,:B10
,:B9
,:B8
,:B7
,:B6
,:B5
,:B4
,TO_DATE(:B3, 'yyyy-mm-dd hh24:mi:ss')
,TO_DATE(:B2, 'yyyy-mm-dd hh24:mi:ss')
,:B1
);
ATTEMPT_RCO 这个表建议使用ID创建hash分区，可以先创建16个分区看看效果如何。
SELECT *
FROM (
SELECT rownum rn
,tmp3.*
FROM (
SELECT tmp2.icr_id
,tmp2.tbc_id
,tmp2.attr_1
,tmp2.type
,to_char((
SELECT max(tcp2.last_study_date)
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 1
), 'yyyy-MM-dd') last_update_date
,(
SELECT count(f.id)
FROM favorites f
WHERE f.icr_id = tmp2.icr_id
AND f.create_by = : 2
) is_faved
,tmp2.course_name
,tmp2.duration
,tmp2.substr_course_name
,to_char(tmp2.start_date, 'yyyy-MM-dd') start_date
,to_char(tmp2.end_date, 'yyyy-MM-dd') end_date
,tmp2.course_point
,(
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 3
) c_time
,(
SELECT tcp2.enroll_type
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 4
) enroll_type
,(
SELECT decode(tcp2.STATUS, 'P', 'Y', 'C', 'Y', 'F', 'F', 'I', 'N', 'N')
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 5
) is_pass
,(
SELECT tcp2.learning_progress
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 6
) learn_progress
,trunc((
round((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 7
) / 60, 2) / tmp2.effectivelength
) * 100, 1) effectivelength
,(
CASE
WHEN (tmp2.start_date IS NULL)
OR (
tmp2.start_date <= sysdate
AND tmp2.end_date IS NULL
)
OR (
tmp2.start_date <= sysdate
AND tmp2.end_date >= sysdate
)
THEN 'Y'
ELSE 'N'
END
) en_start
,(
SELECT floor(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 8
)) / 3600)
FROM dual
) hour
,(
SELECT floor(mod(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 9
)), 3600) / 60)
FROM dual
) minute
,(
SELECT mod(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 10
)), 60)
FROM dual
) second
,tmp2.effectivelength total_study_time
,(
SELECT floor(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 11
)) / 60)
FROM dual
) total_minute
,(
SELECT count(1)
FROM cst_performance cst
,training_class_performance tcp
WHERE tcp.classroom_id = cst.classroom_id
AND tmp2.icr_id = tcp.icr_id
AND cst.user_id = : 12
) isDropClass
,(
SELECT nvl(tcp2.learning_progress, 0)
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 13
) learning_progress
,(
SELECT nvl(tcp2.learning_progress_t, 0)
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = : 14
) learning_progress_t
FROM (
SELECT icr.id icr_id
,icr.tbc_id
,decode(icr.attr_1, '', 'class01.jpg', icr.attr_1) attr_1
,icr.NAME course_name
,cb.duration
,substr(icr.NAME, 1, 15) substr_course_name
,icr.start_date
,icr.end_date
,icr.course_point
,icr.total_study_time
,decode(icr.learningthroughtime, NULL, 30, 0, 1, icr.learningthroughtime) effectivelength
,t.reg_date
,icr.type
FROM (
SELECT icr_id
,max(reg_date) reg_date
FROM (
SELECT icr.id icr_id
,reg_date
FROM learn_enroll le
,implement_class_relation icr
WHERE le.tbc_id = icr.tbc_id
AND icr.is_deleted = 'N'
AND (
icr.end_date IS NULL
OR (
icr.end_date IS NOT NULL
AND icr.end_date > sysdate
)
)
AND le.reg_id IN (
: 15
,: 16
,: 17
,: 18
,: 19
,: 20
,: 21
)
AND le.icr_id = 0
UNION ALL
SELECT icr_id
,reg_date
FROM learn_enroll le
WHERE le.icr_id <> 0
AND le.reg_id IN (
: 22
,: 23
,: 24
,: 25
,: 26
,: 27
,: 28
)
)
GROUP BY icr_id
) t
,implement_class_relation icr
,training_bag_class tbc
,course_bank cb
WHERE tbc.id = icr.tbc_id
AND t.icr_id = icr.id
AND icr.is_deleted = 'N'
AND tbc.object_type IN (
'O'
,'W'
)
AND tbc.is_deleted = 'N'
AND (
icr.end_date IS NULL
OR (
icr.end_date IS NOT NULL
AND icr.end_date > sysdate
)
)
AND (
tbc.end_date IS NULL
OR (
tbc.end_date IS NOT NULL
AND tbc.end_date > sysdate
)
)
AND tbc.is_published = 'Y'
AND icr.course_id = cb.id
AND cb.is_deleted = 'N'
ORDER BY reg_date DESC
) tmp2
) tmp3
WHERE 1 = 1
)
WHERE rn >= : 29
AND rn <= : 30;
-------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 536 (100)| |
| 1 | SORT AGGREGATE | | 1 | 22 | | |
| 2 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 22 | 3 (0)| 00:00:01 |
| 3 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 4 | SORT AGGREGATE | | 1 | 14 | | |
| 5 | TABLE ACCESS BY INDEX ROWID | FAVORITES | 1 | 14 | 3 (0)| 00:00:01 |
| 6 | INDEX RANGE SCAN | IDEX_ICR_ID | 2 | | 1 (0)| 00:00:01 |
| 7 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 8 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 9 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 16 | 3 (0)| 00:00:01 |
| 10 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 11 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 16 | 3 (0)| 00:00:01 |
| 12 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 13 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 17 | 3 (0)| 00:00:01 |
| 14 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 15 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 16 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 17 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 18 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 19 | SORT AGGREGATE | | 1 | | | |
| 20 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 21 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 22 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 23 | SORT AGGREGATE | | 1 | | | |
| 24 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 25 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 26 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 27 | SORT AGGREGATE | | 1 | | | |
| 28 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 29 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 30 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 31 | SORT AGGREGATE | | 1 | | | |
| 32 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 33 | SORT AGGREGATE | | 1 | 28 | | |
| 34 | HASH JOIN | | 31 | 868 | 8 (13)| 00:00:01 |
| 35 | INDEX RANGE SCAN | CP_PK | 81 | 1134 | 3 (0)| 00:00:01 |
| 36 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 158 | 2212 | 4 (0)| 00:00:01 |
| 37 | INDEX RANGE SCAN | TCP_ICR_ID_IDX | 158 | | 3 (0)| 00:00:01 |
| 38 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 17 | 3 (0)| 00:00:01 |
| 39 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 40 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 16 | 3 (0)| 00:00:01 |
| 41 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 42 | FILTER | | | | | |
| 43 | VIEW | | 1 | 3857 | 536 (1)| 00:00:07 |
| 44 | COUNT | | | | | |
| 45 | VIEW | | 1 | 3691 | 536 (1)| 00:00:07 |
| 46 | SORT ORDER BY | | 1 | 131 | 536 (1)| 00:00:07 |
| 47 | NESTED LOOPS | | 1 | 131 | 535 (1)| 00:00:07 |
| 48 | NESTED LOOPS | | 1 | 110 | 533 (1)| 00:00:07 |
| 49 | NESTED LOOPS | | 1 | 99 | 532 (1)| 00:00:07 |
| 50 | VIEW | | 25 | 550 | 481 (1)| 00:00:06 |
| 51 | HASH GROUP BY | | 25 | 550 | 481 (1)| 00:00:06 |
| 52 | VIEW | | 25 | 550 | 480 (1)| 00:00:06 |
| 53 | UNION-ALL | | | | | |
| 54 | TABLE ACCESS BY INDEX ROWID | IMPLEMENT_CLASS_RELATION | 1 | 24 | 14 (0)| 00:00:01 |
| 55 | NESTED LOOPS | | 24 | 1152 | 444 (1)| 00:00:06 |
| 56 | INLIST ITERATOR | | | | | |
| 57 | TABLE ACCESS BY INDEX ROWID| LEARN_ENROLL | 29 | 696 | 36 (0)| 00:00:01 |
| 58 | INDEX RANGE SCAN | ENROLL_REG_ID | 30 | | 9 (0)| 00:00:01 |
| 59 | INDEX RANGE SCAN | ICR_PK | 15 | | 2 (0)| 00:00:01 |
| 60 | INLIST ITERATOR | | | | | |
| 61 | TABLE ACCESS BY INDEX ROWID | LEARN_ENROLL | 1 | 18 | 36 (0)| 00:00:01 |
| 62 | INDEX RANGE SCAN | ENROLL_REG_ID | 30 | | 9 (0)| 00:00:01 |
| 63 | TABLE ACCESS BY INDEX ROWID | IMPLEMENT_CLASS_RELATION | 1 | 77 | 3 (0)| 00:00:01 |
| 64 | INDEX RANGE SCAN | ICR_ID | 1 | | 2 (0)| 00:00:01 |
| 65 | TABLE ACCESS BY INDEX ROWID | COURSE_BANK | 1 | 11 | 1 (0)| 00:00:01 |
| 66 | INDEX UNIQUE SCAN | SYS_C0028643 | 1 | | 0 (0)| |
| 67 | TABLE ACCESS BY INDEX ROWID | TRAINING_BAG_CLASS | 1 | 21 | 2 (0)| 00:00:01 |
| 68 | INDEX UNIQUE SCAN | SYS_C0032569 | 1 | | 1 (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------------------------
该查询使用索引TCP_UN进行INDEX UNIQUE SCAN，建议表TRAINING_CLASS_PERFORMANCE按照ICR_ID，USER_ID创建hash分区。可先创建16个分区。
UPDATE TRAINING_CLASS_PERFORMANCE TCP
SET TCP.LAST_UPDATE_RCO = :B9
,TCP.C_TIME = NVL(TCP.C_TIME, 0) + :B8
,TCP.C_TIMES = NVL(TCP.C_TIMES, 0) + :B7
,TCP.LAST_UPDATEED_BY = :B2
,TCP.LEARNING_PROGRESS = ROUND(:B6, 1)
,TCP.LEARNING_PROGRESS_T = ROUND(:B5, 1)
,TCP.LAST_UPDATE_DATE = SYSDATE
,TCP.LAST_STUDY_DATE = SYSDATE
,TCP.CLASSROOM_ID = NVL(TCP.CLASSROOM_ID, :B4)
,TCP.IS_LEARN = 1
,TCP.ENROLL_TYPE = DECODE(TCP.IS_DELETED, 'Y', 'R', TCP.ENROLL_TYPE)
,TCP.STATUS = DECODE(TCP.STATUS, 'I', 'F', TCP.STATUS)
,TCP.IS_DELETED = 'N'
WHERE TCP.ICR_ID = :B3
AND TCP.USER_ID = :B2
AND TCP.TBC_ID = :B1;
同样，该语句使用TCP_UN索引查询，上面的优化对此sql同样有效
查看awr发现有几个对象的gc等待比较高的
gc等待
主要是以下三个对象
IDX_ILA_USERNAME
IDX_ILA_FIRST_NAME
ILA_USER
查看以下这几个对象之间的关系
select table_name,INDEX_NAME from dba_indexes where index_name IN ('IDX_ILA_USERNAME','IDX_ILA_FIRST_NAME') and owner='ILEARN_TRA';
TABLE_NAME INDEX_NAME
------------------------------ ------------------------------------------------------------------------------------------
ILA_USER IDX_ILA_FIRST_NAME
ILA_USER IDX_ILA_USERNAME
UPDATE ila_user u
SET last_request_date = trunc(sysdate)
,LAST_LOGIN = sysdate
WHERE u.id = : 1;
select * from table(dbms_xplan.display_awr('68br5jm77bq0m'));
---------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------
| 0 | UPDATE STATEMENT | | | | 4 (100)| |
| 1 | UPDATE | ILA_USER | | | | |
| 2 | INDEX RANGE SCAN| TB_SITE_IDX | 1 | 11 | 3 (0)| 00:00:01 |
---------------------------------------------------------------------------------
查看索引和表的创建sql
CREATE INDEX "ILEARN_TRA"."IDX_ILA_FIRST_NAME" ON "ILEARN_TRA"."ILA_USER" ("FIRST_NAME")
CREATE INDEX "ILEARN_TRA"."IDX_ILA_USERNAME" ON "ILEARN_TRA"."ILA_USER" ("USERNAME")
表ILA_USER存在主键，主键列是CONSTRAINT "ILA_USER_PK" PRIMARY KEY ("ID")
以上建议全部修改为hash分区
select * from table(dbms_xplan.display_awr('14yx2vjbnycqh'));
-------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | 536 (100)| |
| 1 | SORT AGGREGATE | | 1 | 22 | | |
| 2 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 22 | 3 (0)| 00:00:01 |
| 3 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 4 | SORT AGGREGATE | | 1 | 14 | | |
| 5 | TABLE ACCESS BY INDEX ROWID | FAVORITES | 1 | 14 | 3 (0)| 00:00:01 |
| 6 | INDEX RANGE SCAN | IDEX_ICR_ID | 2 | | 1 (0)| 00:00:01 |
| 7 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 8 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 9 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 16 | 3 (0)| 00:00:01 |
| 10 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 11 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 16 | 3 (0)| 00:00:01 |
| 12 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 13 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 17 | 3 (0)| 00:00:01 |
| 14 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 15 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 16 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 17 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 18 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 19 | SORT AGGREGATE | | 1 | | | |
| 20 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 21 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 22 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 23 | SORT AGGREGATE | | 1 | | | |
| 24 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 25 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 26 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 27 | SORT AGGREGATE | | 1 | | | |
| 28 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 29 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 18 | 3 (0)| 00:00:01 |
| 30 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 31 | SORT AGGREGATE | | 1 | | | |
| 32 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 33 | SORT AGGREGATE | | 1 | 28 | | |
| 34 | HASH JOIN | | 31 | 868 | 8 (13)| 00:00:01 |
| 35 | INDEX RANGE SCAN | CP_PK | 81 | 1134 | 3 (0)| 00:00:01 |
| 36 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 158 | 2212 | 4 (0)| 00:00:01 |
| 37 | INDEX RANGE SCAN | TCP_ICR_ID_IDX | 158 | | 3 (0)| 00:00:01 |
| 38 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 17 | 3 (0)| 00:00:01 |
| 39 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 40 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 1 | 16 | 3 (0)| 00:00:01 |
| 41 | INDEX UNIQUE SCAN | TCP_UN | 1 | | 2 (0)| 00:00:01 |
| 42 | FILTER | | | | | |
| 43 | VIEW | | 1 | 3857 | 536 (1)| 00:00:07 |
| 44 | COUNT | | | | | |
| 45 | VIEW | | 1 | 3691 | 536 (1)| 00:00:07 |
| 46 | SORT ORDER BY | | 1 | 131 | 536 (1)| 00:00:07 |
| 47 | NESTED LOOPS | | 1 | 131 | 535 (1)| 00:00:07 |
| 48 | NESTED LOOPS | | 1 | 110 | 533 (1)| 00:00:07 |
| 49 | NESTED LOOPS | | 1 | 99 | 532 (1)| 00:00:07 |
| 50 | VIEW | | 25 | 550 | 481 (1)| 00:00:06 |
| 51 | HASH GROUP BY | | 25 | 550 | 481 (1)| 00:00:06 |
| 52 | VIEW | | 25 | 550 | 480 (1)| 00:00:06 |
| 53 | UNION-ALL | | | | | |
| 54 | TABLE ACCESS BY INDEX ROWID | IMPLEMENT_CLASS_RELATION | 1 | 24 | 14 (0)| 00:00:01 |
| 55 | NESTED LOOPS | | 24 | 1152 | 444 (1)| 00:00:06 |
| 56 | INLIST ITERATOR | | | | | |
| 57 | TABLE ACCESS BY INDEX ROWID| LEARN_ENROLL | 29 | 696 | 36 (0)| 00:00:01 |
| 58 | INDEX RANGE SCAN | ENROLL_REG_ID | 30 | | 9 (0)| 00:00:01 |
| 59 | INDEX RANGE SCAN | ICR_PK | 15 | | 2 (0)| 00:00:01 |
| 60 | INLIST ITERATOR | | | | | |
| 61 | TABLE ACCESS BY INDEX ROWID | LEARN_ENROLL | 1 | 18 | 36 (0)| 00:00:01 |
| 62 | INDEX RANGE SCAN | ENROLL_REG_ID | 30 | | 9 (0)| 00:00:01 |
| 63 | TABLE ACCESS BY INDEX ROWID | IMPLEMENT_CLASS_RELATION | 1 | 77 | 3 (0)| 00:00:01 |
| 64 | INDEX RANGE SCAN | ICR_ID | 1 | | 2 (0)| 00:00:01 |
| 65 | TABLE ACCESS BY INDEX ROWID | COURSE_BANK | 1 | 11 | 1 (0)| 00:00:01 |
| 66 | INDEX UNIQUE SCAN | SYS_C0028643 | 1 | | 0 (0)| |
| 67 | TABLE ACCESS BY INDEX ROWID | TRAINING_BAG_CLASS | 1 | 21 | 2 (0)| 00:00:01 |
| 68 | INDEX UNIQUE SCAN | SYS_C0032569 | 1 | | 1 (0)| 00:00:01 |
-------------------------------------------------------------------------------------------------------------------------
看看sql的统计信息
SQL统计信息
该SQL的执行统计信息明显是不正常的。逻辑读过高，一方面存在数据重复扫描的情况，另外，有可能限制的预估执行计划不是真实的执行情况。
检查表TRAINING_CLASS_PERFORMANCE的统计信息时间
SQL> select last_analyzed from dba_tables where table_name ='TRAINING_CLASS_PERFORMANCE' and owner ='ILEARN_TRA';
LAST_ANALYZED
------------------
18-NOV-15
统计信息比较陈旧了，查看是否被锁定
SQL> select STATTYPE_LOCKED,TABLE_NAME,owner from dba_tab_statistics where table_name ='TRAINING_CLASS_PERFORMANCE' and owner ='ILEARN_TRA';
STATTYPE_LOCKED TABLE_NAME OWNER
--------------- ------------------------------ ---------------
ALL TRAINING_CLASS_PERFORMANCE ILEARN_TRA
这个表的统计信息已经被锁定，后续准备定位人为锁定原因。现在检查该SQL的真实执行计划
select datatype_string,name,value_string from v$sql_bind_capture where sql_id='14yx2vjbnycqh';
DATATYPE_STRING NAME VALUE_STRING
------------------------------ ----- --------------------------------------------------
NUMBER :1 277406254
NUMBER :2 277406254
NUMBER :3 277406254
NUMBER :4 277406254
NUMBER :5 277406254
NUMBER :6 277406254
NUMBER :7 277406254
NUMBER :8 277406254
NUMBER :9 277406254
NUMBER :10 277406254
NUMBER :11 277406254
NUMBER :12 277406254
NUMBER :13 277406254
NUMBER :14 277406254
VARCHAR2(32) :15 277406254
VARCHAR2(32) :16 181
VARCHAR2(32) :17 181
VARCHAR2(32) :18 11836001
VARCHAR2(32) :19 11836952
VARCHAR2(32) :20 11836982
VARCHAR2(32) :21 11836989
VARCHAR2(32) :22 277406254
VARCHAR2(32) :23 181
VARCHAR2(32) :24 181
VARCHAR2(32) :25 11836001
VARCHAR2(32) :26 11836952
VARCHAR2(32) :27 11836982
VARCHAR2(32) :28 11836989
NUMBER :29 1
NUMBER :30 10
先把这些绑定变量的值带入到sql里面
SELECT /*+ gather_plan_statistics */ *
FROM (
SELECT rownum rn
,tmp3.*
FROM (
SELECT tmp2.icr_id
,tmp2.tbc_id
,tmp2.attr_1
,tmp2.type
,to_char((
SELECT max(tcp2.last_study_date)
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
), 'yyyy-MM-dd') last_update_date
,(
SELECT count(f.id)
FROM favorites f
WHERE f.icr_id = tmp2.icr_id
AND f.create_by = 277406254
) is_faved
,tmp2.course_name
,tmp2.duration
,tmp2.substr_course_name
,to_char(tmp2.start_date, 'yyyy-MM-dd') start_date
,to_char(tmp2.end_date, 'yyyy-MM-dd') end_date
,tmp2.course_point
,(
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) c_time
,(
SELECT tcp2.enroll_type
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) enroll_type
,(
SELECT decode(tcp2.STATUS, 'P', 'Y', 'C', 'Y', 'F', 'F', 'I', 'N', 'N')
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) is_pass
,(
SELECT tcp2.learning_progress
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) learn_progress
,trunc((
round((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) / 60, 2) / tmp2.effectivelength
) * 100, 1) effectivelength
,(
CASE
WHEN (tmp2.start_date IS NULL)
OR (
tmp2.start_date <= sysdate
AND tmp2.end_date IS NULL
)
OR (
tmp2.start_date <= sysdate
AND tmp2.end_date >= sysdate
)
THEN 'Y'
ELSE 'N'
END
) en_start
,(
SELECT floor(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
)) / 3600)
FROM dual
) hour
,(
SELECT floor(mod(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
)), 3600) / 60)
FROM dual
) minute
,(
SELECT mod(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
)), 60)
FROM dual
) second
,tmp2.effectivelength total_study_time
,(
SELECT floor(sum((
SELECT tcp2.c_time
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
)) / 60)
FROM dual
) total_minute
,(
SELECT count(1)
FROM cst_performance cst
,training_class_performance tcp
WHERE tcp.classroom_id = cst.classroom_id
AND tcp.icr_id = tmp2.icr_id
AND cst.user_id = 277406254
) isDropClass
,(
SELECT nvl(tcp2.learning_progress, 0)
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) learning_progress
,(
SELECT nvl(tcp2.learning_progress_t, 0)
FROM training_class_performance tcp2
WHERE tmp2.icr_id = tcp2.icr_id
AND tcp2.user_id = 277406254
) learning_progress_t
FROM (
SELECT icr.id icr_id
,icr.tbc_id
,decode(icr.attr_1, '', 'class01.jpg', icr.attr_1) attr_1
,icr.NAME course_name
,cb.duration
,substr(icr.NAME, 1, 15) substr_course_name
,icr.start_date
,icr.end_date
,icr.course_point
,icr.total_study_time
,decode(icr.learningthroughtime, NULL, 30, 0, 1, icr.learningthroughtime) effectivelength
,t.reg_date
,icr.type
FROM (
SELECT icr_id,max(reg_date) reg_date
FROM (
SELECT icr.id icr_id
,reg_date
FROM learn_enroll le
,implement_class_relation icr
WHERE le.tbc_id = icr.tbc_id
AND icr.is_deleted = 'N'
AND (
icr.end_date IS NULL
OR (
icr.end_date IS NOT NULL
AND icr.end_date > sysdate
)
)
AND le.reg_id IN (
'277406254'
,'181'
,'181'
,'11836001'
,'11836952'
,'11836982'
,'11836989'
)
AND le.icr_id = 0
UNION ALL
SELECT icr_id
,reg_date
FROM learn_enroll le
WHERE le.icr_id <> 0
AND le.reg_id IN (
'277406254'
,'181'
,'181'
,'11836001'
,'11836952'
,'11836982'
,'11836989'
)
)
GROUP BY icr_id
) t
,implement_class_relation icr
,training_bag_class tbc
,course_bank cb
WHERE tbc.id = icr.tbc_id
AND t.icr_id = icr.id
AND icr.is_deleted = 'N'
AND tbc.object_type IN (
'O'
,'W'
)
AND tbc.is_deleted = 'N'
AND (
icr.end_date IS NULL
OR (
icr.end_date IS NOT NULL
AND icr.end_date > sysdate
)
)
AND (
tbc.end_date IS NULL
OR (
tbc.end_date IS NOT NULL
AND tbc.end_date > sysdate
)
)
AND tbc.is_published = 'Y'
AND icr.course_id = cb.id
AND cb.is_deleted = 'N'
ORDER BY reg_date DESC
) tmp2
) tmp3
WHERE 1 = 1
)
WHERE rn >= 1
AND rn <= 10;
select * from table(dbms_xplan.display_cursor(null,null,'iostats'));
----------------------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Starts | E-Rows | A-Rows | A-Time | Buffers |
----------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | | 10 |00:00:00.03 | 92617 |
| 1 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.01 | 254 |
| 2 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 3 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 4 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.01 | 65 |
|* 5 | TABLE ACCESS BY INDEX ROWID | FAVORITES | 63 | 1 | 0 |00:00:00.01 | 65 |
|* 6 | INDEX RANGE SCAN | IDEX_ICR_ID | 63 | 2 | 0 |00:00:00.01 | 65 |
| 7 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 8 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 9 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 10 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 11 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 12 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 13 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 14 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 15 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 16 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 17 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 18 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 19 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.01 | 254 |
| 20 | FAST DUAL | | 63 | 1 | 63 |00:00:00.01 | 0 |
| 21 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 22 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 23 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.01 | 254 |
| 24 | FAST DUAL | | 63 | 1 | 63 |00:00:00.01 | 0 |
| 25 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 26 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 27 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.01 | 254 |
| 28 | FAST DUAL | | 63 | 1 | 63 |00:00:00.01 | 0 |
| 29 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 30 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 31 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.01 | 254 |
| 32 | FAST DUAL | | 63 | 1 | 63 |00:00:00.01 | 0 |
| 33 | SORT AGGREGATE | | 63 | 1 | 63 |00:00:00.86 | 88632 |
|* 34 | HASH JOIN | | 63 | 38 | 130K|00:00:00.82 | 88632 |
|* 35 | INDEX RANGE SCAN | CP_PK | 63 | 86 | 5733 |00:00:00.01 | 189 |
| 36 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 158 | 103K|00:00:00.63 | 88443 |
|* 37 | INDEX RANGE SCAN | TCP_ICR_ID_IDX | 63 | 158 | 103K|00:00:00.01 | 1524 |
| 38 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 39 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
| 40 | TABLE ACCESS BY INDEX ROWID | TRAINING_CLASS_PERFORMANCE | 63 | 1 | 63 |00:00:00.01 | 254 |
|* 41 | INDEX UNIQUE SCAN | TCP_UN | 63 | 1 | 63 |00:00:00.01 | 191 |
|* 42 | VIEW | | 1 | 1 | 10 |00:00:00.03 | 92617 |
| 43 | COUNT | | 1 | | 63 |00:00:00.01 | 872 |
| 44 | VIEW | | 1 | 1 | 63 |00:00:00.01 | 872 |
| 45 | SORT ORDER BY | | 1 | 1 | 63 |00:00:00.01 | 872 |
| 46 | NESTED LOOPS | | 1 | 1 | 63 |00:00:00.01 | 872 |
| 47 | NESTED LOOPS | | 1 | 1 | 64 |00:00:00.01 | 678 |
| 48 | NESTED LOOPS | | 1 | 1 | 66 |00:00:00.01 | 546 |
| 49 | VIEW | | 1 | 19 | 66 |00:00:00.01 | 345 |
| 50 | HASH GROUP BY | | 1 | 19 | 66 |00:00:00.01 | 345 |
| 51 | VIEW | | 1 | 19 | 66 |00:00:00.01 | 345 |
| 52 | UNION-ALL | | 1 | | 66 |00:00:00.01 | 345 |
|* 53 | TABLE ACCESS BY INDEX ROWID | IMPLEMENT_CLASS_RELATION | 1 | 1 | 3 |00:00:00.01 | 276 |
| 54 | NESTED LOOPS | | 1 | 18 | 172 |00:00:00.01 | 195 |
| 55 | INLIST ITERATOR | | 1 | | 62 |00:00:00.01 | 69 |
|* 56 | TABLE ACCESS BY INDEX ROWID| LEARN_ENROLL | 6 | 24 | 62 |00:00:00.01 | 69 |
|* 57 | INDEX RANGE SCAN | ENROLL_REG_ID | 6 | 25 | 125 |00:00:00.01 | 18 |
|* 58 | INDEX RANGE SCAN | ICR_PK | 62 | 15 | 109 |00:00:00.01 | 126 |
| 59 | INLIST ITERATOR | | 1 | | 63 |00:00:00.01 | 69 |
|* 60 | TABLE ACCESS BY INDEX ROWID | LEARN_ENROLL | 6 | 1 | 63 |00:00:00.01 | 69 |
|* 61 | INDEX RANGE SCAN | ENROLL_REG_ID | 6 | 25 | 125 |00:00:00.01 | 18 |
|* 62 | TABLE ACCESS BY INDEX ROWID | IMPLEMENT_CLASS_RELATION | 66 | 1 | 66 |00:00:00.01 | 201 |
|* 63 | INDEX RANGE SCAN | ICR_ID | 66 | 1 | 66 |00:00:00.01 | 135 |
|* 64 | TABLE ACCESS BY INDEX ROWID | COURSE_BANK | 66 | 1 | 64 |00:00:00.01 | 132 |
|* 65 | INDEX UNIQUE SCAN | SYS_C0028643 | 66 | 1 | 64 |00:00:00.01 | 68 |
|* 66 | TABLE ACCESS BY INDEX ROWID | TRAINING_BAG_CLASS | 64 | 1 | 63 |00:00:00.01 | 194 |
|* 67 | INDEX UNIQUE SCAN | SYS_C0032569 | 64 | 1 | 64 |00:00:00.01 | 130 |
----------------------------------------------------------------------------------------------------------------------------------
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