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“響應時間”是衡量數據庫性能的常用指標。在MariaDB中可以使用插件“QUERY_RESPONSE_TIME”來獲取查詢時間區間的統計信息。

// 安裝插 件
$ cd ${mysql_base}/lib/plugin $ ll -rw-r--r--. 1 root root 403898 Feb 25 01:15 query_response_time.so MariaDB [(none)]> install plugin query_response_time_audit soname 'query_response_time.so'; MariaDB [(none)]> install plugin query_response_time soname 'query_response_time.so'; MariaDB [(none)]> show plugins; ... | QUERY_RESPONSE_TIME_AUDIT | ACTIVE | AUDIT | query_response_time.so | GPL | | QUERY_RESPONSE_TIME | ACTIVE | INFORMATION SCHEMA | query_response_time.so | GPL | +-------------------------------+----------+--------------------+------------------------+---------+

// 參數說明

MariaDB [(none)]> show variables like 'query_response%'; +--------------------------------+-------+ | Variable_name | Value | +--------------------------------+-------+ | query_response_time_flush | OFF | | query_response_time_range_base | 10 | | query_response_time_stats | OFF | +--------------------------------+-------+ 3 rows in set (0.00 sec)

query_response_time_flush

Description: Updating this variable flushes the statistics and re-reads query_response_time_range_base.
Commandline: None
Scope: Global
Dynamic: Yes
Data Type: boolean
Default Value: OFF

query_response_time_range_base
Description: Select base of log for QUERY_RESPONSE_TIME ranges. WARNING: variable change takes affect only after flush.
Commandline: --query-response-time-range-base=#
Scope: Global
Dynamic: Yes
Data Type: numeric
Default Value: 10
Range: 2 to 1000

if the range base=10, we have the following intervals:
(0; 10 ^ -6], (10 ^ -6; 10 ^ -5], (10 ^ -5; 10 ^ -4], ...,?
(10 ^ -1; 10 ^1], (10^1; 10^2]...(10^7; positive infinity]

query_response_time_stats
Description: Enable or disable query response time statistics collecting
Commandline: query-response-time-stats[={0|1}]
Scope: Global
Dynamic: Yes
Data Type: boolean
Default Value: OFF

// 打開統計
MariaDB [(none)]> set global query_response_time_stats = 1; Query OK, 0 rows affected (0.00 sec)MariaDB [(none)]> set global query_response_time_flush='ON'; Query OK, 0 rows affected (0.00 sec)MariaDB [information_schema]> select * from information_schema.QUERY_RESPONSE_TIME; +----------------+-------+----------------+ | TIME | COUNT | TOTAL | +----------------+-------+----------------+ | 0.000001 | 0 | 0.000000 | | 0.000010 | 0 | 0.000000 | | 0.000100 | 70 | 0.002200 | | 0.001000 | 16 | 0.005615 | | 0.010000 | 0 | 0.000000 | | 0.100000 | 0 | 0.000000 | | 1.000000 | 0 | 0.000000 | | 10.000000 | 0 | 0.000000 | | 100.000000 | 0 | 0.000000 | | 1000.000000 | 0 | 0.000000 | | 10000.000000 | 0 | 0.000000 | | 100000.000000 | 0 | 0.000000 | | 1000000.000000 | 0 | 0.000000 | | TOO LONG | 0 | TOO LONG | +----------------+-------+----------------+ 14 rows in set (0.00 sec) // 分析
從上面的記錄可知：
有70個查詢的執行時間在0.000010秒<query execution time < =0.000100秒這個區間里；耗時總計0.002200秒。
有16個查詢的執行時間在0.000100秒<query execution time < =0.001000秒這個區間里；耗時總計0.005615秒。

轉載于:https://my.oschina.net/liuliufa/blog/645377

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