mysql profile explain slow_query_log分析優化查詢
阿新 • • 發佈:2019-01-23
|Query |
+----------+------------+-----------------------------------+
| 1 | 0.00021500 | [email protected]@profiling |
| 2 | 0.05522700 | select count(*)from abc_posts|
+----------+------------+-----------------------------------+
2 rows in set (0.00 sec)
注意:Query_ID表示剛執行的查詢語句
show profile for query 2;
+--------------------------------+----------+
|Status |
Duration |
+--------------------------------+----------+
|starting | 0.000021 |
| checking query cache for query | 0.000045 |
| checkingpermissions | 0.000007 |
| Openingtables | 0.000011 |
| Systemlock | 0.000004 |
| Tablelock | 0.000040 |
|init | 0.000012 |
|optimizing | 0.000005 |
|statistics | 0.000010 |
|preparing
+----------+------------+-----------------------------------+
| 1 | 0.00021500 | [email protected]@profiling |
| 2 | 0.05522700 | select count(*)from abc_posts|
+----------+------------+-----------------------------------+
2 rows in set (0.00 sec)
注意:Query_ID表示剛執行的查詢語句
show profile for query 2;
+--------------------------------+----------+
|Status
+--------------------------------+----------+
|starting | 0.000021 |
| checking query cache for query | 0.000045 |
| checkingpermissions | 0.000007 |
| Openingtables | 0.000011 |
| Systemlock | 0.000004 |
| Tablelock | 0.000040 |
|init | 0.000012 |
|optimizing | 0.000005 |
|statistics | 0.000010 |
|preparing