ORACLE:执行计划中BITMAP AND导致sql慢
原sql：
SQL> explain plan for SELECT *
2 FROM crmdw.irsl_renew_user a, crmdw.irsl_renew_tmp_user b, crmdw.on_cor_table t
3 WHERE a.irsl_date = '2015-09-25'
4 AND b.irsl_date = '2015-09-25'
5 AND TO_CHAR (t.end_date, 'yyyy-mm-dd') = '9999-12-31'
6 AND b.IS_BW = 1
7 AND b.seach_sign_comp IN (1, 2, 3)
8 AND a.providerid = b.providerid
9 AND t.providerid = a.providerid;
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Plan hash value: 2509217529
---------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 2145 | 88436 (4)| 00:17:42 |
| 1 | TEMP TABLE TRANSFORMATION | | | | | |
| 2 | LOAD AS SELECT | SYS_TEMP_0FD9D66A2_D73DA0B4 | | | | |
|* 3 | TABLE ACCESS FULL | ON_COR_TABLE | 6242 | 10M| 34723 (1)| 00:06:57 |
| 4 | LOAD AS SELECT | SYS_TEMP_0FD9D66A2_D73DA0B4 | | | | |
| 5 | TABLE ACCESS BY INDEX ROWID | IRSL_RENEW_TMP_USER | 10803 | 2342K| 1801 (1)| 00:00:22 |
|* 6 | INDEX RANGE SCAN | IND_RENEW_IRSLDATE_IB_SSC | 11359 | | 702 (1)| 00:00:09 |
|* 7 | HASH JOIN | | 1 | 2145 | 51912 (7)| 00:10:23 |
|* 8 | HASH JOIN | | 15 | 28620 | 51839 (7)| 00:10:23 |
| 9 | TABLE ACCESS BY INDEX ROWID | IRSL_RENEW_USER | 292 | 48307 | 51556 (7)| 00:10:19 |
| 10 | BITMAP CONVERSION TO ROWIDS | | | | | |
| 11 | BITMAP AND | | | | | |
| 12 | BITMAP CONVERSION FROM ROWIDS | | | | | |
|* 13 | INDEX RANGE SCAN | IDX_RENEW_IRSLDATE | | | 707 (1)| 00:00:09 |
| 14 | BITMAP MERGE | | | | | |
| 15 | BITMAP KEY ITERATION | | | | | |
| 16 | TABLE ACCESS FULL | SYS_TEMP_0FD9D66A2_D73DA0B4 | 1 | 13 | 2 (0)| 00:00:01 |
| 17 | BITMAP CONVERSION FROM ROWIDS| | | | | |
|* 18 | INDEX RANGE SCAN | IDX_RENEW_PROVIDERID | | | 3 (0)| 00:00:01 |
| 19 | BITMAP MERGE | | | | | |
| 20 | BITMAP KEY ITERATION | | | | | |
| 21 | TABLE ACCESS FULL | SYS_TEMP_0FD9D66A1_D73DA0B4 | 1 | 13 | 2 (0)| 00:00:01 |
| 22 | BITMAP CONVERSION FROM ROWIDS| | | | | |
|* 23 | INDEX RANGE SCAN | IDX_RENEW_PROVIDERID | | | 3 (0)| 00:00:01 |
| 24 | TABLE ACCESS FULL | SYS_TEMP_0FD9D66A1_D73DA0B4 | 6242 | 10M| 282 (1)| 00:00:04 |
| 25 | TABLE ACCESS FULL | SYS_TEMP_0FD9D66A2_D73DA0B4 | 10803 | 2500K| 73 (2)| 00:00:01 |
---------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
3 - filter(TO_CHAR(INTERNAL_FUNCTION("T"."END_DATE"),'yyyy-mm-dd')='9999-12-31')
6 - access("B"."IRSL_DATE"='2015-09-25')
filter(TO_NUMBER("B"."IS_BW")=1 AND (TO_NUMBER("B"."SEACH_SIGN_COMP")=2 OR
TO_NUMBER("B"."SEACH_SIGN_COMP")=3 OR TO_NUMBER("B"."SEACH_SIGN_COMP")=1))
7 - access("A"."PROVIDERID"="C0")
8 - access("C0"="A"."PROVIDERID")
13 - access("A"."IRSL_DATE"='2015-09-25')
18 - access("A"."PROVIDERID"="C0")
23 - access("A"."PROVIDERID"="C0")
Note
-----
- star transformation used for this statement
改写后：
explain plan for select *
from (select /*+ no_merge */ b.*
from crmdw.irsl_renew_user a, crmdw.irsl_renew_tmp_user b
where a.irsl_date = '2015-09-25'
and a.providerid = b.providerid
and b.irsl_date = '2015-09-25'
and b.IS_BW = 1
and b.seach_sign_comp in (1, 2, 3)) ab,
crmdw.on_cor_table t
where t.providerid = ab.providerid
and to_char(t.end_date, 'yyyy-mm-dd') = '9999-12-31';
--------------------------------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
--------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | | | | 68569 (100)| |
|* 1 | HASH JOIN | | 6242 | 171M| 10M| 68569 (1)| 00:13:43 |
|* 2 | TABLE ACCESS FULL | ON_COR_TABLE | 6242 | 10M| | 34723 (1)| 00:06:57 |
| 3 | VIEW | | 19403 | 502M| | 8425 (1)| 00:01:42 |
|* 4 | HASH JOIN | | 19403 | 4566K| 2472K| 8425 (1)| 00:01:42 |
| 5 | TABLE ACCESS BY INDEX ROWID| IRSL_RENEW_TMP_USER | 10803 | 2342K| | 1801 (1)| 00:00:22 |
|* 6 | INDEX RANGE SCAN | IND_RENEW_IRSLDATE_IB_SSC | 11359 | | | 702 (1)| 00:00:09 |
| 7 | TABLE ACCESS BY INDEX ROWID| IRSL_RENEW_USER | 220K| 4088K| | 6177 (1)| 00:01:15 |
|* 8 | INDEX RANGE SCAN | IDX_RENEW_IRSLDATE | 228K| | | 707 (1)| 00:00:09 |
--------------------------------------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - access("T"."PROVIDERID"="AB"."PROVIDERID")
2 - filter(TO_CHAR(INTERNAL_FUNCTION("T"."END_DATE"),'yyyy-mm-dd')='9999-12-31')
4 - access("A"."PROVIDERID"="B"."PROVIDERID")
6 - access("B"."IRSL_DATE"='2015-09-25')
filter((TO_NUMBER("B"."IS_BW")=1 AND (TO_NUMBER("B"."SEACH_SIGN_COMP")=2 OR
TO_NUMBER("B"."SEACH_SIGN_COMP")=3 OR TO_NUMBER("B"."SEACH_SIGN_COMP")=1)))
8 - access("A"."IRSL_DATE"='2015-09-25')