SQL> set autot trace exp
SQL> select /*+ PARALLEL(8) */ count (1 ) from es_ins_rec;
Execution Plan
----------------------------------------------------------
Plan hash value: 3542243435
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| Id | Operation | Name | Rows | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib |
----------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 8834 (3)| 00:00:18 | | | |
| 1 | SORT AGGREGATE | | 1 | | | | | |
| 2 | PX COORDINATOR | | | | | | | |
| 3 | PX SEND QC (RANDOM) | :TQ10000 | 1 | | | Q1,00 | P->S | QC (RAND) |
| 4 | SORT AGGREGATE | | 1 | | | Q1,00 | PCWP | |
| 5 | PX BLOCK ITERATOR | | 83M| 8834 (3)| 00:00:18 | Q1,00 | PCWC | |
| 6 | INDEX FAST FULL SCAN| PK_ES_INS_REC | 83M| 8834 (3)| 00:00:18 | Q1,00 | PCWP | |
----------------------------------------------------------------------------------------------------------------
Note
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- Degree of Parallelism is 8 because of hint
SQL>
并行度其他写法：
INSERT /*+ parallel(t 8) */ INTO es_ins_rect 【注意： /*+ pa.. 有没有空格都可以】
咳咳,,貌似没多大意义的样子!! 可以当复习了...
【源于本人笔记】 若有书写错误，表达错误，请指正...
