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| Plan hash value: 370690737
-------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 21965 (100)| | | 1 | SORT AGGREGATE | | 1 | 43 | | | | 2 | NESTED LOOPS | | | | | | | 3 | NESTED LOOPS | | 1 | 43 | 21965 (1)| 00:04:24 | |* 4 | TABLE ACCESS FULL | A | 1 | 12 | 21962 (1)| 00:04:24 | |* 5 | INDEX RANGE SCAN | TT | 65 | | 1 (0)| 00:00:01 | |* 6 | TABLE ACCESS BY INDEX ROWID| A | 1 | 31 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------------------
Predicate Information (identified by operation id): --------------------------------------------------- 4 - filter("A2"."STATUS"=‘ccc‘) 5 - access("A1"."OBJECT_ID"="A2"."OBJECT_ID") 6 - filter(("A1"."OBJECT_NAME"=‘c‘ AND "A1"."OBJECT_TYPE">‘O‘)) |
| Plan hash value: 370690737
-------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 21965 (100)| | | 1 | SORT AGGREGATE | | 1 | 43 | | | | 2 | NESTED LOOPS | | | | | | | 3 | NESTED LOOPS | | 1 | 43 | 21965 (1)| 00:04:24 | |* 4 | TABLE ACCESS FULL | A | 1 | 12 | 21962 (1)| 00:04:24 | |* 5 | INDEX RANGE SCAN | TT | 65 | | 1 (0)| 00:00:01 | |* 6 | TABLE ACCESS BY INDEX ROWID| A | 1 | 31 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------------------
Predicate Information (identified by operation id): --------------------------------------------------- 4 - filter("A2"."STATUS"=‘ccc‘) 5 - access("A1"."OBJECT_ID"="A2"."OBJECT_ID") 6 - filter(("A1"."OBJECT_NAME"=‘c‘ AND "A1"."OBJECT_TYPE">‘O‘)) |
| Plan hash value: 370690737
-------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 21965 (100)| | | 1 | SORT AGGREGATE | | 1 | 43 | | | | 2 | NESTED LOOPS | | | | | | | 3 | NESTED LOOPS | | 1 | 43 | 21965 (1)| 00:04:24 | |* 4 | TABLE ACCESS FULL | A | 1 | 12 | 21962 (1)| 00:04:24 | |* 5 | INDEX RANGE SCAN | TT | 65 | | 1 (0)| 00:00:01 | |* 6 | TABLE ACCESS BY INDEX ROWID| A | 1 | 31 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------------------
Predicate Information (identified by operation id): --------------------------------------------------- 4 - filter("A2"."STATUS"=‘ccc‘) 5 - access("A1"."OBJECT_ID"="A2"."OBJECT_ID") 6 - filter(("A1"."OBJECT_NAME"=‘c‘ AND "A1"."OBJECT_TYPE">‘O‘)) |
| Plan hash value: 370690737
-------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 21965 (100)| | | 1 | SORT AGGREGATE | | 1 | 43 | | | | 2 | NESTED LOOPS | | | | | | | 3 | NESTED LOOPS | | 1 | 43 | 21965 (1)| 00:04:24 | |* 4 | TABLE ACCESS FULL | A | 1 | 12 | 21962 (1)| 00:04:24 | |* 5 | INDEX RANGE SCAN | TT | 65 | | 1 (0)| 00:00:01 | |* 6 | TABLE ACCESS BY INDEX ROWID| A | 1 | 31 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------------------
Predicate Information (identified by operation id): --------------------------------------------------- 4 - filter("A2"."STATUS"=‘ccc‘) 5 - access("A1"."OBJECT_ID"="A2"."OBJECT_ID") 6 - filter(("A1"."OBJECT_NAME"=‘c‘ AND "A1"."OBJECT_TYPE">‘O‘)) |
Document:34592.1 WAITEVENT: "log file sync"
注意：这些警告信息对于预防潜在问题的发生很有帮助。就算平均等待时间没问题，通过找到 I/O 性能峰值点，DBA 可以知道 LGWR 会间歇性的遇到性能问题，进而在它引发更大问题前将其解决。
*** 2011-10-26 10:14:41.718
Warning: log write elapsed time 21130ms, size 1KB
(set event 10468 level 4 to disable this warning)
*** 2011-10-26 10:14:42.929
Warning: log write elapsed time 4916ms, size 1KB
(set event 10468 level 4 to disable this warning)
参考
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Plan hash value: 370690737
-------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 21965 (100)| | | 1 | SORT AGGREGATE | | 1 | 43 | | | | 2 | NESTED LOOPS | | | | | | | 3 | NESTED LOOPS | | 1 | 43 | 21965 (1)| 00:04:24 | |* 4 | TABLE ACCESS FULL | A | 1 | 12 | 21962 (1)| 00:04:24 | |* 5 | INDEX RANGE SCAN | TT | 65 | | 1 (0)| 00:00:01 | |* 6 | TABLE ACCESS BY INDEX ROWID| A | 1 | 31 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------------------
Predicate Information (identified by operation id): --------------------------------------------------- 4 - filter("A2"."STATUS"=‘ccc‘) 5 - access("A1"."OBJECT_ID"="A2"."OBJECT_ID") 6 - filter(("A1"."OBJECT_NAME"=‘c‘ AND "A1"."OBJECT_TYPE">‘O‘))
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-------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | | | 21965 (100)| | | 1 | SORT AGGREGATE | | 1 | 43 | | | | 2 | NESTED LOOPS | | | | | | | 3 | NESTED LOOPS | | 1 | 43 | 21965 (1)| 00:04:24 | |* 4 | TABLE ACCESS FULL | A | 1 | 12 | 21962 (1)| 00:04:24 | |* 5 | INDEX RANGE SCAN | TT | 65 | | 1 (0)| 00:00:01 | |* 6 | TABLE ACCESS BY INDEX ROWID| A | 1 | 31 | 3 (0)| 00:00:01 | --------------------------------------------------------------------------------------
Predicate Information (identified by operation id): --------------------------------------------------- 4 - filter("A2"."STATUS"=‘ccc‘) 5 - access("A1"."OBJECT_ID"="A2"."OBJECT_ID") 6 - filter(("A1"."OBJECT_NAME"=‘c‘ AND "A1"."OBJECT_TYPE">‘O‘))
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原文地址：http://www.cnblogs.com/lhrbest/p/5866889.html
