(1) QPS(每秒Query量)
QPS = Questions(or Queries) / uptime
MySQL> show global status like 'Question%';
mysql> show global status like 'uptime';
(2) TPS(每秒事務(wù)量)
TPS = (Com_commit + Com_rollback) / uptime
mysql > show global status like 'Com_commit';
mysql > show global status like 'Com_rollback';
mysql> show global status like 'uptime';
(3)key Buffer 命中率
mysql>show global status like 'key%';
key_buffer_read_hits = (1-key_reads /key_read_requests) * 100%
key_buffer_write_hits = (1-key_writes /key_write_requests) * 100%
(4)InnoDB Buffer命中率
mysql> show status like 'innodb_buffer_pool_read%';
innodb_buffer_read_hits = (1 -innodb_buffer_pool_reads / innodb_buffer_pool_read_requests) * 100%
(5)Query Cache命中率
mysql> show status like 'Qcache%';
Query_cache_hits = (Qcahce_hits /(Qcache_hits + Qcache_inserts )) * 100%;
(6)Table Cache狀態(tài)量
mysql> show global status like 'open%';
比較 open_tables 與opend_tables值
(7)Thread Cache 命中率
mysql> show global status like'Thread%';
mysql> show global status like'Connections';
Thread_cache_hits = (1 - Threads_created /connections ) * 100%
(8)鎖定狀態(tài)
mysql> show global status like '%lock%';
Table_locks_waited/Table_locks_immediate=0.3% 如果這個(gè)比值比較大的話,說(shuō)明表鎖造成的阻塞比較嚴(yán)重
Innodb_row_lock_waits innodb行鎖,太大可能是間隙鎖造成的
(9)復(fù)制延時(shí)量
mysql > show slave status
查看Seconds_Behind_Master的值,如果為0,說(shuō)明沒(méi)有延遲
(10) Tmp Table 狀況(臨時(shí)表狀況)
mysql > show global status like 'Created_tmp%';
Created_tmp_disk_tables/Created_tmp_tables比值最好不要超過(guò)10%,如果Created_tmp_tables值比較大,
可能是排序句子過(guò)多或者是連接句子不夠優(yōu)化
(11) Binlog Cache 使用狀況
mysql > show global status like 'Binlog_cache%';
如果Binlog_cache_disk_use值不為0 ,可能需要調(diào)大 binlog_cache_size大小
(12) Innodb_log_waits 量
mysql > show status like'innodb_log_waits';
Innodb_log_waits值不等于0的話,表明 innodblog buffer 因?yàn)榭臻g不足而等待
(13)open file and table
mysql> show global status like 'Open_files';
mysql> show global status like 'Open_tables';
(14) 慢查詢
開(kāi)啟慢查詢:
1).手動(dòng)執(zhí)行命令開(kāi)啟:
mysql> set global slow_query_log=on;
mysql> set global long_query_time=1;
2).編輯/etc/my.cnf,在[mysqld]域中添加:
slow_query_log= 1 # 開(kāi)啟慢查詢
slow_query_log_file=/data/data/localhost-slow.log # 慢查詢?nèi)罩韭窂?br />long_query_time= 1 # 慢查詢的時(shí)長(zhǎng)
(15)全日志
查看全日志:
show global variables like 'general_log';
開(kāi)啟全日志:
set global general_log=on;
注意開(kāi)啟全日志會(huì)消耗
服務(wù)器性能,一般只有在排查問(wèn)題時(shí)才會(huì)短暫打開(kāi)。
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