Created
July 23, 2012 09:23
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| -------------------------------------------------------------------------------- | |
| -- count(*) | |
| -------------------------------------------------------------------------------- | |
| 18:18:19 SQL> select count(*) from message; | |
| COUNT(*) | |
| ---------- | |
| 17718 | |
| 経過: 00:00:00.04 | |
| 実行計画 | |
| ---------------------------------------------------------- | |
| Plan hash value: 2159657772 | |
| ------------------------------------------------------------------------------- | |
| | Id | Operation | Name | Rows | Cost (%CPU)| Time | | |
| ------------------------------------------------------------------------------- | |
| | 0 | SELECT STATEMENT | | 1 | 68 (0)| 00:00:01 | | |
| | 1 | SORT AGGREGATE | | 1 | | | | |
| | 2 | INDEX FAST FULL SCAN| SYS_C00167450 | 15875 | 68 (0)| 00:00:01 | | |
| ------------------------------------------------------------------------------- | |
| Note | |
| ----- | |
| - dynamic sampling used for this statement (level=2) | |
| 統計 | |
| ---------------------------------------------------------- | |
| 428 recursive calls | |
| 0 db block gets | |
| 366 consistent gets | |
| 0 physical reads | |
| 0 redo size | |
| 447 bytes sent via SQL*Net to client | |
| 420 bytes received via SQL*Net from client | |
| 2 SQL*Net roundtrips to/from client | |
| 6 sorts (memory) | |
| 0 sorts (disk) | |
| 1 rows processed | |
| -------------------------------------------------------------------------------- | |
| -- count(1) | |
| -------------------------------------------------------------------------------- | |
| 18:18:48 SQL> select count(1) from message; | |
| COUNT(1) | |
| ---------- | |
| 17718 | |
| 経過: 00:00:00.01 | |
| 実行計画 | |
| ---------------------------------------------------------- | |
| Plan hash value: 2159657772 | |
| ------------------------------------------------------------------------------- | |
| | Id | Operation | Name | Rows | Cost (%CPU)| Time | | |
| ------------------------------------------------------------------------------- | |
| | 0 | SELECT STATEMENT | | 1 | 68 (0)| 00:00:01 | | |
| | 1 | SORT AGGREGATE | | 1 | | | | |
| | 2 | INDEX FAST FULL SCAN| SYS_C00167450 | 15875 | 68 (0)| 00:00:01 | | |
| ------------------------------------------------------------------------------- | |
| Note | |
| ----- | |
| - dynamic sampling used for this statement (level=2) | |
| 統計 | |
| ---------------------------------------------------------- | |
| 428 recursive calls | |
| 0 db block gets | |
| 366 consistent gets | |
| 0 physical reads | |
| 0 redo size | |
| 447 bytes sent via SQL*Net to client | |
| 420 bytes received via SQL*Net from client | |
| 2 SQL*Net roundtrips to/from client | |
| 6 sorts (memory) | |
| 0 sorts (disk) | |
| 1 rows processed | |
| -------------------------------------------------------------------------------- | |
| -- count(rowid) | |
| -------------------------------------------------------------------------------- | |
| 18:19:29 SQL> select count(rowid) from message; | |
| COUNT(ROWID) | |
| ------------ | |
| 17718 | |
| 経過: 00:00:00.04 | |
| 実行計画 | |
| ---------------------------------------------------------- | |
| Plan hash value: 2159657772 | |
| --------------------------------------------------------------------------------------- | |
| | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | | |
| --------------------------------------------------------------------------------------- | |
| | 0 | SELECT STATEMENT | | 1 | 12 | 68 (0)| 00:00:01 | | |
| | 1 | SORT AGGREGATE | | 1 | 12 | | | | |
| | 2 | INDEX FAST FULL SCAN| SYS_C00167450 | 15875 | 186K| 68 (0)| 00:00:01 | | |
| --------------------------------------------------------------------------------------- | |
| Note | |
| ----- | |
| - dynamic sampling used for this statement (level=2) | |
| 統計 | |
| ---------------------------------------------------------- | |
| 428 recursive calls | |
| 0 db block gets | |
| 366 consistent gets | |
| 0 physical reads | |
| 0 redo size | |
| 451 bytes sent via SQL*Net to client | |
| 420 bytes received via SQL*Net from client | |
| 2 SQL*Net roundtrips to/from client | |
| 6 sorts (memory) | |
| 0 sorts (disk) | |
| 1 rows processed |
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