delete from wxh_tbd;
73338 rows deleted.
Execution Plan
----------------------------------------------------------
Plan hash value: 3904056193
---------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------
| 0 | DELETE STATEMENT | | 73338 | 358K| 154 (1)| 00:00:01 |
| 1 | DELETE | WXH_TBD | | | | |
| 2 | INDEX FULL SCAN| SYS_C0016055 | 73338 | 358K| 154 (1)| 00:00:01 |
---------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------
| 0 | DELETE STATEMENT | | 73338 | 358K| 154 (1)| 00:00:01 |
| 1 | DELETE | WXH_TBD | | | | |
| 2 | INDEX FULL SCAN| SYS_C0016055 | 73338 | 358K| 154 (1)| 00:00:01 |
---------------------------------------------------------------------------------
Statistics
----------------------------------------------------------
218 recursive calls
81526 db block gets
255 consistent gets
1 physical reads
30513272 redo size
1133 bytes sent via SQL*Net to client
1268 bytes received via SQL*Net from client
4 SQL*Net roundtrips to/from client
8 sorts (memory)
0 sorts (disk)
73338 rows processed
rollback
Rollback complete.
delete /*+ full(a) */ from wxh_tbd a;
73338 rows deleted.
Execution Plan
----------------------------------------------------------
Plan hash value: 1781138943
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------
| 0 | DELETE STATEMENT | | 73338 | 358K| 285 (1)| 00:00:01 |
| 1 | DELETE | WXH_TBD | | | | |
| 2 | TABLE ACCESS FULL| WXH_TBD | 73338 | 358K| 285 (1)| 00:00:01 |
------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
------------------------------------------------------------------------------
| 0 | DELETE STATEMENT | | 73338 | 358K| 285 (1)| 00:00:01 |
| 1 | DELETE | WXH_TBD | | | | |
| 2 | TABLE ACCESS FULL| WXH_TBD | 73338 | 358K| 285 (1)| 00:00:01 |
------------------------------------------------------------------------------
Statistics
----------------------------------------------------------
127 recursive calls
228792 db block gets
1103 consistent gets
0 physical reads
45173944 redo size
1134 bytes sent via SQL*Net to client
1285 bytes received via SQL*Net from client
4 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
73338 rows processed
可以看到新的执行计划逻辑读更少。原因不清楚为什么
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/22034023/viewspace-711754/ ，如需转载，请注明出处，否则将追究法律责任。
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