MySQL幾點(diǎn)重要的性能指標(biāo)計(jì)算和優(yōu)化方法總結(jié)

MySQL> show GLOBAL status like 'questions';
+---------------+------------+
| Variable_name | Value   |
+---------------+------------+
| Questions   | 2009191409 |
+---------------+------------+
1 row in set (0.00 sec)

mysql> show global status like 'uptime';
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Uptime    | 388402 |
+---------------+--------+
1 row in set (0.00 sec)

mysql> show global status like 'com_update';
+---------------+----------+
| Variable_name | Value  |
+---------------+----------+
| Com_update  | 87094306 |
+---------------+----------+
1 row in set (0.00 sec)

mysql> show global status like 'com_select';
+---------------+------------+
| Variable_name | Value   |
+---------------+------------+
| Com_select  | 1108143397 |
+---------------+------------+
1 row in set (0.00 sec)


mysql> show global status like 'com_delete';
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Com_delete  | 379058 |
+---------------+--------+
1 row in set (0.00 sec)

mysql> show global status like 'uptime';

+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Uptime    | 388816 |
+---------------+--------+
1 row in set (0.00 sec)

mysql> show global status like 'com_commit';

+---------------+---------+
| Variable_name | Value  |
+---------------+---------+
| Com_commit  | 7424815 |
+---------------+---------+
1 row in set (0.00 sec)

mysql> show global status like 'com_rollback';
+---------------+---------+
| Variable_name | Value  |
+---------------+---------+
| Com_rollback | 1073179 |
+---------------+---------+
1 row in set (0.00 sec)

mysql> show global status like 'uptime';
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Uptime    | 389467 |
+---------------+--------+
1 row in set (0.00 sec)

TPS=(com_commit+com_rollback)/uptime=22

mysql> show global status like 'threads_%';
+-------------------+-------+
| Variable_name   | Value |
+-------------------+-------+
| Threads_cached  | 480  |   //代表當(dāng)前此時(shí)此刻線程緩存中有多少空閑線程
| Threads_connected | 153  |  //代表當(dāng)前已建立連接的數(shù)量，因?yàn)橐粋€(gè)連接就需要一個(gè)線程，所以也可以看成當(dāng)前被使用的線程數(shù)
| Threads_created  | 20344 |  //代表從最近一次服務(wù)啟動(dòng)，已創(chuàng)建線程的數(shù)量
| Threads_running  | 2   |   //代表當(dāng)前激活的（非睡眠狀態(tài)）線程數(shù)
+-------------------+-------+
4 rows in set (0.00 sec)

mysql> show global status like 'Connections';
+---------------+-----------+
| Variable_name | Value   |
+---------------+-----------+
| Connections  | 381487397 |
+---------------+-----------+
1 row in set (0.00 sec)

線程緩存命中率=1-Threads_created/Connections  = 99.994%

我們?cè)O(shè)置的線程緩存?zhèn)€數(shù)

mysql> show variables like '%thread_cache_size%';
+-------------------+-------+
| Variable_name   | Value |
+-------------------+-------+
| thread_cache_size | 500  |
+-------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'open_tables%';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Open_tables  | 2228 |
+---------------+-------+
1 row in set (0.00 sec)

mysql> show variables like 'table_open_cache';
+------------------+-------+
| Variable_name  | Value |
+------------------+-------+
| table_open_cache | 16384 |
+------------------+-------+
1 row in set (0.00 sec)

mysql> show variables like 'table_defi%';
+------------------------+-------+
| Variable_name     | Value |
+------------------------+-------+
| table_definition_cache | 2000 |
+------------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'Max_used_connections';
+----------------------+-------+
| Variable_name    | Value |
+----------------------+-------+
| Max_used_connections | 1785 |
+----------------------+-------+
1 row in set (0.00 sec)

mysql> show variables like 'max_connections%';
+-----------------+-------+
| Variable_name  | Value |
+-----------------+-------+
| max_connections | 4000 |
+-----------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'innodb_buffer_pool_read%';
+---------------------------------------+--------------+
| Variable_name             | Value    |
+---------------------------------------+--------------+
| Innodb_buffer_pool_read_ahead_rnd   | 0      |
| Innodb_buffer_pool_read_ahead     | 268720    |   //預(yù)讀的頁(yè)數(shù)
| Innodb_buffer_pool_read_ahead_evicted | 0      |   
| Innodb_buffer_pool_read_requests   | 480291074970 | //從緩沖池中讀取的次數(shù)
| Innodb_buffer_pool_reads       | 29912739   |     //表示從物理磁盤(pán)讀取的頁(yè)數(shù)
+---------------------------------------+--------------+
5 rows in set (0.00 sec)

mysql> show global status like 'key_%';
+------------------------+-----------+
| Variable_name     | Value   |
+------------------------+-----------+
| Key_blocks_not_flushed | 0     |
| Key_blocks_unused   | 106662  |
| Key_blocks_used    | 107171  |
| Key_read_requests   | 883825678 |
| Key_reads       | 133294  |
| Key_write_requests   | 217310758 |
| Key_writes       | 2061054  |
+------------------------+-----------+
7 rows in set (0.00 sec)

mysql> show variables like '%key_cache_block_size%';
+----------------------+-------+
| Variable_name    | Value |
+----------------------+-------+
| key_cache_block_size | 1024 |
+----------------------+-------+
1 row in set (0.00 sec)


mysql> show variables like '%key_buffer_size%';
+-----------------+-----------+
| Variable_name  | Value   |
+-----------------+-----------+
| key_buffer_size | 134217728 |
+-----------------+-----------+
1 row in set (0.00 sec)

mysql> show global status like 'Created_tmp%';
+-------------------------+----------+
| Variable_name      | Value  |
+-------------------------+----------+
| Created_tmp_disk_tables | 19226325 |
| Created_tmp_files    | 117   |
| Created_tmp_tables   | 56265812 |
+-------------------------+----------+
3 rows in set (0.00 sec)

mysql> show variables like '%tmp_table_size%';
+----------------+----------+
| Variable_name | Value  |
+----------------+----------+
| tmp_table_size | 67108864 |
+----------------+----------+
1 row in set (0.00 sec)

mysql> show status like 'Binlog_cache%'; 
+-----------------------+----------+
| Variable_name     | Value  |
+-----------------------+----------+
| Binlog_cache_disk_use | 15    |
| Binlog_cache_use   | 95978256 |
+-----------------------+----------+
2 rows in set (0.00 sec)

mysql> show variables like 'binlog_cache_size';
+-------------------+---------+
| Variable_name   | Value  |
+-------------------+---------+
| binlog_cache_size | 1048576 |
+-------------------+---------+
1 row in set (0.00 sec)

mysql> show variables like '%innodb_log_buffer_size%';
+------------------------+---------+
| Variable_name     | Value  |
+------------------------+---------+
| innodb_log_buffer_size | 8388608 |
+------------------------+---------+
1 row in set (0.00 sec)
mysql> show status like 'innodb_log_waits';
+------------------+-------+
| Variable_name  | Value |
+------------------+-------+
| Innodb_log_waits | 0   |
+------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'Handler_read%';
+-----------------------+--------------+
| Variable_name     | Value    |
+-----------------------+--------------+
| Handler_read_first  | 19180695   |
| Handler_read_key   | 30303690598 |
| Handler_read_last   | 290721    |
| Handler_read_next   | 51169834260 |
| Handler_read_prev   | 1267528402  |
| Handler_read_rnd   | 219230406  |
| Handler_read_rnd_next | 344713226172 |
+-----------------------+--------------+
7 rows in set (0.00 sec)

mysql> show global status like 'Innodb_buffer_pool_wait_free';
+------------------------------+-------+
| Variable_name        | Value |
+------------------------------+-------+
| Innodb_buffer_pool_wait_free | 0   |
+------------------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'select_full_join';
+------------------+-------+
| Variable_name  | Value |
+------------------+-------+
| Select_full_join | 10403 |
+------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'select_range';
+---------------+----------+
| Variable_name | Value  |
+---------------+----------+
| Select_range | 22450380 |
+---------------+----------+
1 row in set (0.00 sec)

mysql> show global status like 'Select_range_check';
+--------------------+-------+
| Variable_name   | Value |
+--------------------+-------+
| Select_range_check | 0   |
+--------------------+-------+
1 row in set (0.00 sec)

mysql> show GLOBAL status like 'select_scan';
+---------------+-----------+
| Variable_name | Value   |
+---------------+-----------+
| Select_scan  | 116037811 |
+---------------+-----------+
1 row in set (0.00 sec)

mysql> show global status like 'Slow_queries';
+---------------+--------+
| Variable_name | Value |
+---------------+--------+
| Slow_queries | 114111 |
+---------------+--------+
1 row in set (0.00 sec)

mysql> show global status like 'table_lock%';
+-----------------------+------------+
| Variable_name     | Value   |
+-----------------------+------------+
| Table_locks_immediate | 1644917567 |
| Table_locks_waited  | 53     |
+-----------------------+------------+
2 rows in set (0.00 sec)