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
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.
The total time spent in acquiring row locks, in milliseconds. Added in MySQL 5.0.3.
The average time to acquire a row lock, in milliseconds. Added in MySQL 5.0.3.
The maximum time to acquire a row lock, in milliseconds. Added in MySQL 5.0.3.
The number of times a row lock had to be waited for. Added in MySQL 5.0.3.