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consistent gets是被如何计算出来的?哪怕是粗略的!
[php]
SQL> select * from t;
ID
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1
执行计划
----------------------------------------------------------
Plan hash value: 1601196873
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 13 | 2 (0)| 00:00:01 |
| 1 | TABLE ACCESS FULL| T | 1 | 13 | 2 (0)| 00:00:01 |
--------------------------------------------------------------------------
Note
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- dynamic sampling used for this statement
统计信息
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5 recursive calls
0 db block gets
7 consistent gets
0 physical reads
0 redo size
406 bytes sent via SQL*Net to client
385 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
SQL> desc t
名称 是否为空? 类型
----------------------------------------- -------- ----------------------------
ID NUMBER(38)
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