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Oracle19c HINT不生效？

news 2025/7/27 20:33:07

Oracle19c Exadata一体机

SQL> select banner_full from v$version;BANNER_FULL
--------------------------------------------------------------------------------
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.27.0.0.0

SQL语句

WITH a AS(SELECT /*+ index(h idx_ef_ap_fee_header_pc) */ h.customer_code owner_code,cu.ebcu_name_cn,cu.original_group_code,cu.is_group_customer,su.suppliers_code,su.suppliers_name_cn,SUM(wf.quantity) cu_area,efor.operating_unit_id,efor.operating_unit_nameFROM bms.ef_ap_fee_detail wf,bms.ef_ap_fee_header h,lmdm.eb_customer cu,lmdm.eb_supplier su,lmdm.ef_organ_relation eforWHERE wf.head_pm_code=h.pm_codeAND h.CUSTOMER_CODE = cu.pm_codeAND su.suppliers_code = h.supplier_codeAND efor.operating_unit_id = h.bursar_bodyAND wf.fee_code = 'CFZ001'AND su.suppliers_type = '100'AND substr(su.suppliers_code_group,-6,6) = efor.company_codeAND wf.fee_date >= TO_DATE ('20250601', 'yyyymmdd')AND wf.fee_date <= TO_DATE ('20250630', 'yyyymmdd')AND h.bursar_body = to_number('945')GROUP BY h.CUSTOMER_CODE,cu.ebcu_name_cn,cu.original_group_code,cu.is_group_customer,su.suppliers_code,su.suppliers_name_cn,efor.operating_unit_id,efor.operating_unit_name)
SELECT  TO_DATE (SUBSTR ('20250601', 0, 6), 'yyyy-mm') AS fee_month,a.operating_unit_id, a.operating_unit_name, a.suppliers_code,a.suppliers_name_cn, a.owner_code, a.ebcu_name_cn,a.original_group_code, a.is_group_customer, a.cu_area, b.su_areaFROM a aLEFT JOIN(SELECT   suppliers_name_cn, SUM (cu_area) su_areaFROM aGROUP BY suppliers_name_cn) bON a.suppliers_name_cn = b.suppliers_name_cn;

执行计划

Plan hash value: 348546137-------------------------------------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                                        | Name                       | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     | Pstart| Pstop |
-------------------------------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                                 |                            | 69275 |   117M|       |   166K  (1)| 00:00:07 |       |       |
|   1 |  TEMP TABLE TRANSFORMATION                       |                            |       |       |       |            |          |       |       |
|   2 |   LOAD AS SELECT (CURSOR DURATION MEMORY)        | SYS_TEMP_0FD9D8AEC_3DD52C  |       |       |       |            |          |       |       |
|   3 |    HASH GROUP BY                                 |                            | 69275 |    17M|    18M|   158K  (1)| 00:00:07 |       |       |
|*  4 |     HASH JOIN                                    |                            | 69275 |    17M|    14M|   155K  (1)| 00:00:07 |       |       |
|   5 |      JOIN FILTER CREATE                          | :BF0000                    | 69350 |    13M|       |   146K  (1)| 00:00:06 |       |       |
|*  6 |       HASH JOIN                                  |                            | 69350 |    13M|  4472K|   146K  (1)| 00:00:06 |       |       |
|   7 |        TABLE ACCESS BY GLOBAL INDEX ROWID BATCHED| EF_AP_FEE_DETAIL           | 69350 |  3657K|       |   118K  (1)| 00:00:05 | ROWID | ROWID |
|*  8 |         INDEX SKIP SCAN                          | IDX_EF_AP_FEE_DETAIL_FD_FC | 69353 |       |       |   103K  (1)| 00:00:05 |       |       |
|   9 |        VIEW                                      | VW_GBF_32                  | 72429 |    10M|       | 27457   (1)| 00:00:02 |       |       |
|  10 |         HASH GROUP BY                            |                            | 72429 |    12M|    13M| 27457   (1)| 00:00:02 |       |       |
|  11 |          NESTED LOOPS                            |                            | 72429 |    12M|       | 24864   (1)| 00:00:01 |       |       |
|  12 |           NESTED LOOPS                           |                            | 73416 |    12M|       | 24864   (1)| 00:00:01 |       |       |
|  13 |            NESTED LOOPS                          |                            |   138 | 15594 |       |  6685   (1)| 00:00:01 |       |       |
|  14 |             TABLE ACCESS BY INDEX ROWID BATCHED  | EF_ORGAN_RELATION          |     1 |    65 |       |     2   (0)| 00:00:01 |       |       |
|* 15 |              INDEX RANGE SCAN                    | IDX$$_1147BA0005           |     1 |       |       |     1   (0)| 00:00:01 |       |       |
|* 16 |             TABLE ACCESS BY INDEX ROWID BATCHED  | EB_SUPPLIER                |   138 |  6624 |       |  6683   (1)| 00:00:01 |       |       |
|* 17 |              INDEX RANGE SCAN                    | IND_SUPPLIERS_TYPE         | 99652 |       |       |   408   (0)| 00:00:01 |       |       |
|* 18 |            INDEX RANGE SCAN                      | IDX_EAFH_SC_SC_BB          |   532 |       |       |   107   (0)| 00:00:01 |       |       |
|  19 |           TABLE ACCESS BY GLOBAL INDEX ROWID     | EF_AP_FEE_HEADER           |   526 | 32612 |       |   310   (0)| 00:00:01 | ROWID | ROWID |
|  20 |      JOIN FILTER USE                             | :BF0000                    |   368K|    20M|       |  6624   (1)| 00:00:01 |       |       |
|* 21 |       TABLE ACCESS STORAGE FULL                  | EB_CUSTOMER                |   368K|    20M|       |  6624   (1)| 00:00:01 |       |       |
|* 22 |   HASH JOIN RIGHT OUTER                          |                            | 69275 |   117M|    35M|  7245   (1)| 00:00:01 |       |       |
|  23 |    VIEW                                          |                            | 69275 |    34M|       |  1270   (1)| 00:00:01 |       |       |
|  24 |     HASH GROUP BY                                |                            | 69275 |  2367K|  3008K|  1270   (1)| 00:00:01 |       |       |
|  25 |      VIEW                                        |                            | 69275 |  2367K|       |   670   (1)| 00:00:01 |       |       |
|  26 |       TABLE ACCESS STORAGE FULL                  | SYS_TEMP_0FD9D8AEC_3DD52C  | 69275 |    10M|       |   670   (1)| 00:00:01 |       |       |
|  27 |    VIEW                                          |                            | 69275 |    83M|       |   670   (1)| 00:00:01 |       |       |
|  28 |     TABLE ACCESS STORAGE FULL                    | SYS_TEMP_0FD9D8AEC_3DD52C  | 69275 |    10M|       |   670   (1)| 00:00:01 |       |       |
-------------------------------------------------------------------------------------------------------------------------------------------------------Predicate Information (identified by operation id):
---------------------------------------------------4 - access("ITEM_1"="CU"."PM_CODE")6 - access("WF"."HEAD_PM_CODE"="ITEM_2")8 - access("WF"."FEE_DATE">=TO_DATE(' 2025-06-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "WF"."FEE_CODE"='CFZ001' AND "WF"."FEE_DATE"<=TO_DATE(' 2025-06-30 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))filter("WF"."FEE_CODE"='CFZ001')15 - access("EFOR"."OPERATING_UNIT_ID"=945)16 - filter("EFOR"."COMPANY_CODE"=SUBSTR("SU"."SUPPLIERS_CODE_GROUP",(-6),6))17 - access("SU"."SUPPLIERS_TYPE"=100)18 - access("SU"."SUPPLIERS_CODE"="H"."SUPPLIER_CODE")filter("EFOR"."OPERATING_UNIT_ID"=TO_NUMBER("H"."BURSAR_BODY") AND TO_NUMBER("H"."BURSAR_BODY")=945)21 - storage(SYS_OP_BLOOM_FILTER(:BF0000,"CU"."PM_CODE"))filter(SYS_OP_BLOOM_FILTER(:BF0000,"CU"."PM_CODE"))22 - access("A"."SUPPLIERS_NAME_CN"="B"."SUPPLIERS_NAME_CN"(+))Hint Report (identified by operation id / Query Block Name / Object Alias):
Total hints for statement: 1 (U - Unused (1))
---------------------------------------------------------------------------18 -  SEL$93AF3180 / H@SEL$4U -  index(h idx_ef_ap_fee_header_pc)

加了HINT/*+ index(h idx_ef_ap_fee_header_pc) */，但是h走的是IDX_EAFH_SC_SC_BB

在Oracle中，加了HINT，但是不走，要么HINT写错了，要么是Oracle优化器某些特性把HINT忽略了。秒了一眼执行计划，发现有2个HASH GROUP BY，原始SQL只有一个GROUP BY
哦，明白了，group_by_placement 这个优化器特性导致HINT不生效

现在关闭group_by_placement

WITH a AS(SELECT /*+ index(h idx_ef_ap_fee_header_pc) opt_param('_optimizer_group_by_placement', 'false')   */ h.customer_code owner_code,cu.ebcu_name_cn,cu.original_group_code,cu.is_group_customer,su.suppliers_code,su.suppliers_name_cn,SUM(wf.quantity) cu_area,efor.operating_unit_id,efor.operating_unit_nameFROM bms.ef_ap_fee_detail wf,bms.ef_ap_fee_header h,lmdm.eb_customer cu,lmdm.eb_supplier su,lmdm.ef_organ_relation eforWHERE wf.head_pm_code=h.pm_codeAND h.CUSTOMER_CODE = cu.pm_codeAND su.suppliers_code = h.supplier_codeAND efor.operating_unit_id = h.bursar_bodyAND wf.fee_code = 'CFZ001'AND su.suppliers_type = '100'AND substr(su.suppliers_code_group,-6,6) = efor.company_codeAND wf.fee_date >= TO_DATE ('20250601', 'yyyymmdd')AND wf.fee_date <= TO_DATE ('20250630', 'yyyymmdd')AND h.bursar_body = to_number('945')GROUP BY h.CUSTOMER_CODE,cu.ebcu_name_cn,cu.original_group_code,cu.is_group_customer,su.suppliers_code,su.suppliers_name_cn,efor.operating_unit_id,efor.operating_unit_name)
SELECT  TO_DATE (SUBSTR ('20250601', 0, 6), 'yyyy-mm') AS fee_month,a.operating_unit_id, a.operating_unit_name, a.suppliers_code,a.suppliers_name_cn, a.owner_code, a.ebcu_name_cn,a.original_group_code, a.is_group_customer, a.cu_area, b.su_areaFROM a aLEFT JOIN(SELECT   suppliers_name_cn, SUM (cu_area) su_areaFROM aGROUP BY suppliers_name_cn) bON a.suppliers_name_cn = b.suppliers_name_cn;

执行计划

Plan hash value: 2148346612----------------------------------------------------------------------------------------------------------------------------------------------------------
| Id  | Operation                                           | Name                       | Rows  | Bytes |TempSpc| Cost (%CPU)| Time     | Pstart| Pstop |
----------------------------------------------------------------------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT                                    |                            |    56 |    97K|       |   334K  (1)| 00:00:14 |       |       |
|   1 |  TEMP TABLE TRANSFORMATION                          |                            |       |       |       |            |          |       |       |
|   2 |   LOAD AS SELECT (CURSOR DURATION MEMORY)           | SYS_TEMP_0FD9D8AEB_3DD52C  |       |       |       |            |          |       |       |
|   3 |    HASH GROUP BY                                    |                            |    56 | 16072 |       |   334K  (1)| 00:00:14 |       |       |
|   4 |     NESTED LOOPS                                    |                            |    56 | 16072 |       |   334K  (1)| 00:00:14 |       |       |
|   5 |      NESTED LOOPS                                   |                            |    56 | 16072 |       |   334K  (1)| 00:00:14 |       |       |
|*  6 |       HASH JOIN                                     |                            |    56 | 12824 |       |   333K  (1)| 00:00:14 |       |       |
|   7 |        TABLE ACCESS BY INDEX ROWID BATCHED          | EF_ORGAN_RELATION          |     1 |    65 |       |     2   (0)| 00:00:01 |       |       |
|*  8 |         INDEX RANGE SCAN                            | IDX$$_1147BA0005           |     1 |       |       |     1   (0)| 00:00:01 |       |       |
|*  9 |        HASH JOIN                                    |                            | 40798 |  6534K|  5840K|   333K  (1)| 00:00:14 |       |       |
|  10 |         TABLE ACCESS BY INDEX ROWID BATCHED         | EB_SUPPLIER                | 99652 |  4671K|       |  6682   (1)| 00:00:01 |       |       |
|* 11 |          INDEX RANGE SCAN                           | IND_SUPPLIERS_TYPE         | 99652 |       |       |   409   (0)| 00:00:01 |       |       |
|  12 |         NESTED LOOPS                                |                            | 69350 |  7856K|       |   326K  (1)| 00:00:13 |       |       |
|  13 |          NESTED LOOPS                               |                            | 69350 |  7856K|       |   326K  (1)| 00:00:13 |       |       |
|  14 |           TABLE ACCESS BY GLOBAL INDEX ROWID BATCHED| EF_AP_FEE_DETAIL           | 69350 |  3657K|       |   118K  (1)| 00:00:05 | ROWID | ROWID |
|* 15 |            INDEX SKIP SCAN                          | IDX_EF_AP_FEE_DETAIL_FD_FC | 69353 |       |       |   103K  (1)| 00:00:05 |       |       |
|* 16 |           INDEX UNIQUE SCAN                         | IDX_EF_AP_FEE_HEADER_PC    |     1 |       |       |     2   (0)| 00:00:01 |       |       |
|* 17 |          TABLE ACCESS BY GLOBAL INDEX ROWID         | EF_AP_FEE_HEADER           |     1 |    62 |       |     3   (0)| 00:00:01 | ROWID | ROWID |
|* 18 |       INDEX UNIQUE SCAN                             | UNQ_EBCU_PM_CODE           |     1 |       |       |     1   (0)| 00:00:01 |       |       |
|  19 |      TABLE ACCESS BY INDEX ROWID                    | EB_CUSTOMER                |     1 |    58 |       |     2   (0)| 00:00:01 |       |       |
|* 20 |   HASH JOIN RIGHT OUTER                             |                            |    56 |    97K|       |     7  (15)| 00:00:01 |       |       |
|  21 |    VIEW                                             |                            |    56 | 29512 |       |     4  (25)| 00:00:01 |       |       |
|  22 |     HASH GROUP BY                                   |                            |    56 |  1960 |       |     4  (25)| 00:00:01 |       |       |
|  23 |      VIEW                                           |                            |    56 |  1960 |       |     3   (0)| 00:00:01 |       |       |
|  24 |       TABLE ACCESS STORAGE FULL                     | SYS_TEMP_0FD9D8AEB_3DD52C  |    56 |  8960 |       |     3   (0)| 00:00:01 |       |       |
|  25 |    VIEW                                             |                            |    56 | 70504 |       |     3   (0)| 00:00:01 |       |       |
|  26 |     TABLE ACCESS STORAGE FULL                       | SYS_TEMP_0FD9D8AEB_3DD52C  |    56 |  8960 |       |     3   (0)| 00:00:01 |       |       |
----------------------------------------------------------------------------------------------------------------------------------------------------------Predicate Information (identified by operation id):
---------------------------------------------------6 - access("EFOR"."OPERATING_UNIT_ID"=TO_NUMBER("H"."BURSAR_BODY") AND "EFOR"."COMPANY_CODE"=SUBSTR("SU"."SUPPLIERS_CODE_GROUP",(-6),6))8 - access("EFOR"."OPERATING_UNIT_ID"=945)9 - access("SU"."SUPPLIERS_CODE"="H"."SUPPLIER_CODE")11 - access("SU"."SUPPLIERS_TYPE"=100)15 - access("WF"."FEE_DATE">=TO_DATE(' 2025-06-01 00:00:00', 'syyyy-mm-dd hh24:mi:ss') AND "WF"."FEE_CODE"='CFZ001' AND "WF"."FEE_DATE"<=TO_DATE(' 2025-06-30 00:00:00', 'syyyy-mm-dd hh24:mi:ss'))filter("WF"."FEE_CODE"='CFZ001')16 - access("WF"."HEAD_PM_CODE"="H"."PM_CODE")17 - filter(TO_NUMBER("H"."BURSAR_BODY")=945)18 - access("H"."CUSTOMER_CODE"="CU"."PM_CODE")20 - access("A"."SUPPLIERS_NAME_CN"="B"."SUPPLIERS_NAME_CN"(+))

本文不讨论SQL优化，只讨论HINT不生效，INDEX SKIP SCAN有问题，这里我们不管它
如果你遇到了HINT不生效，先检查HINT写对了没，位置放对了没，如果确定HINT没问题

1.试一试优化器降级，比如降级到11.2.0.4，11.2.0.1看HINT能否生效，如果能生效，大概率遇到了优化器某个特性阻止HINT生效
2.select * from table(dbms_xplan.display(NULL, NULL, 'advanced -projection')); 看Outline Data
3.10053

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