# 沒有用到查詢快取
16:33:52 127.0.0.1:3306 information_schema>show profile for query 8;
+----------------------+----------+
| Status               | Duration |
+----------------------+----------+
| starting             | 0.000014 |
| checking permissions | 0.000002 |
| Opening tables       | 0.000007 |
| System lock          | 0.000004 |
| init                 | 0.000006 |
| optimizing           | 0.000001 |
| statistics           | 0.000007 |
| preparing            | 0.000004 |
| executing            | 0.000001 |
| Sending data         | 0.000005 |
| end                  | 0.000001 |
| query end            | 0.000001 |
| closing tables       | 0.000003 |
| freeing items        | 0.000013 |
| logging slow query   | 0.000001 |
| cleaning up          | 0.000002 |
+----------------------+----------+
16 rows in set (0.00 sec)

# 用到了查詢快取
16:36:15 127.0.0.1:3306 information_schema>show profile for
 
 query 1;
+--------------------------------+----------+
| Status                         | Duration |
+--------------------------------+----------+
| starting                       | 0.000015 |
| Waiting for query cache lock   | 0.000002 |
| Waiting on query cache mutex   | 0.000002 |
| checking query cache for query | 0.000059 |
| checking permissions           | 0.000006 |
| Opening tables                 | 0.000023 |
| System
 
 lock                    | 0.000013 |
| init                           | 0.000018 |
| optimizing                     | 0.000004 |
| statistics                     | 0.000022 |
| preparing                      | 0.000010 |
| executing                      | 0.000003 |
| Sending data                   | 0.000011 |
| end                            | 0.000003 |
| query end                      | 0.000002 |
| closing tables                 | 0.000007 |
| freeing items                  | 0.000019 |
| logging slow query             | 0.000002 |
| cleaning up                    | 0.000003 |
+--------------------------------+----------+
19 rows in set (0.00 sec)