MySQL的響應時間變慢
阿新 • • 發佈:2019-02-01
# 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 | | Systemlock | 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)