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SHOW STATUS; FLUSH STATUS; 查看当前连接数 SHOW STATUS LIKE ‘Thread_%‘; Thread_cached:被缓存的线程的个数 Thread_running：处于激活状态的线程的个数 Thread_connected：当前连接的线程的个数 Thread_created：总共被创建的线程的个数 Thread cache hits Thread_connected = SHOW GLOBAL STATUS LIKE Thread_created; Connections = SHOW GLOBAL STATUS LIKE ‘Connections‘; TCH=(1 - (Threads_created / Connections)) * 100 查看活动连接内容 SHOW PROCESSLIST; 如果 TCH数小于90%,创建连接耗费了时间,增大Thread_cached数量 QPS Questions = SHOW GLOBAL STATUS LIKE ‘Questions‘; Uptime = SHOW GLOBAL STATUS LIKE ‘Uptime‘; QPS=Questions/Uptime TPS Com_commit = SHOW GLOBAL STATUS LIKE ‘Com_commit‘; Com_rollback = SHOW GLOBAL STATUS LIKE ‘Com_rollback‘; Uptime = SHOW GLOBAL STATUS LIKE ‘Uptime‘; TPS=(Com_commit + Com_rollback)/Uptime QPS 和 TPS值一定要实时监控,如果接近架构搭建时的测试峰值,愿上帝与你同在 Read/Writes Ratio Qcache_hits = SHOW GLOBAL STATUS LIKE ‘Qcache_hits‘; Com_select = SHOW GLOBAL STATUS LIKE ‘Com_select‘; Com_insert = SHOW GLOBAL STATUS LIKE ‘Com_insert‘; Com_update = SHOW GLOBAL STATUS LIKE ‘Com_update‘; Com_delete = SHOW GLOBAL STATUS LIKE ‘Com_delete‘; Com_replace = SHOW GLOBAL STATUS LIKE ‘Com_replace‘; R/W=(Com_select + Qcache_hits) / (Com_insert + Com_update + Com_delete + Com_replace) * 100 读写比,优化数据库的重要依据,读的多就去优化读,写的多就去优化写 Slow queries per minute Slow_queries = SHOW GLOBAL STATUS LIKE ‘Slow_queries‘; Uptime = SHOW GLOBAL STATUS LIKE ‘Uptime‘; SQPM=Slow_queries / (Uptime/60) Slow queries /Questions Ratio Slow_queries = SHOW GLOBAL STATUS LIKE ‘Slow_queries‘; Questions = SHOW GLOBAL STATUS LIKE ‘Questions‘; S/Q=Slow_queries/Questions 新版本上线时要着重关注慢查询,让测试去踢开发者的屁股吧 Full_join per minute Select_full_join = SHOW GLOBAL STATUS LIKE ‘Select_full_join‘; Uptime = SHOW GLOBAL STATUS LIKE ‘Uptime‘; FJPM=Select_full_join / (Uptime/60) 没有使用索引而造成的full_join,优化索引去吧 Innodb buffer read hits Innodb_buffer_pool_reads = SHOW GLOBAL STATUS LIKE ‘Innodb_buffer_pool_reads‘; Innodb_buffer_pool_read_requests = SHOW GLOBAL STATUS LIKE ‘Innodb_buffer_pool_read_requests‘; IFRH=(1 - Innodb_buffer_pool_reads/Innodb_buffer_pool_read_requests) * 100 InnoDB Buffer命中率 目标 95%-99%; Table Cache Open_tables= SHOW GLOBAL STATUS LIKE ‘Open_tables‘; Opened_tables= SHOW GLOBAL STATUS LIKE ‘Opened_tables‘; table_cache= SHOW GLOBAL STATUS LIKE ‘table_cache‘; table_cache应该大于 Open_tables 小于 Opened_tables Temp tables to Disk ratio Created_tmp_tables = show global status like ‘Created_tmp_tables‘; Created_tmp_disk_tables = show global status like ‘Created_tmp_disk_tables‘; TDR=(Created_tmp_disk_tables/Created_tmp_tables)*100 SHOW GLOBAL STATUS LIKE ‘Innodb_row_lock_%‘; Innodb_row_lock_current_waits The number of row locks currently being waited for. Added in MySQL 5.0.3. Innodb_row_lock_time The total time spent in acquiring row locks, in milliseconds. Added in MySQL 5.0.3. Innodb_row_lock_time_avg The average time to acquire a row lock, in milliseconds. Added in MySQL 5.0.3. Innodb_row_lock_time_max The maximum time to acquire a row lock, in milliseconds. Added in MySQL 5.0.3. Innodb_row_lock_waits The number of times a row lock had to be waited for. Added in MySQL 5.0.3.
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原文地址：http://my.oschina.net/jastme/blog/381710
