版权声明：本文为博主DbaH原创文章，允许转载，需要标明出处 https://blog.csdn.net/u011592350/article/details/77817709
线程独享内存
show global variables like ‘%buffer%’;
线程共享内存
show global variables like '%cache%';
QPS(每秒Query量)
QPS = Questions(or Queries) / seconds
show status like ‘Questions’;TPS
TPS = (Com_commit + Com_rollback) / seconds
show status like ‘Com_commit’;
show status like ‘Com_rollback’;
key Buffer命中率
key_buffer_read_hits = (1-key_reads / key_read_requests) * 100%
key_buffer_write_hits = (1-key_writes / key_write_requests) * 100%
show status like ‘Key%’;
innodb_buffer_read_hits = (1 - innodb_buffer_pool_reads /innodb_buffer_pool_read_requests) * 100%
show status like ‘innodb_buffer_pool_read%’;
Query Cache命中率
Query_cache_hits = (Qcahce_hits / (Qcache_hits + Qcache_inserts )) * 100%;
show status like ‘Qcache%’;
Table Cache状态量
show status like ‘open%’;
Thread Cache命中率
Thread_cache_hits = (1 - Threads_created / connections ) * 100%
show status like ‘Connections’;
show status like ‘Thread%’;
连接数
show variables like 'max_connections';
show global status like 'max_used_connections';
临时表
show global status like 'created_tmp%';
排序使用情况
show global status like 'sort%';
表锁情况
show global status like 'table_locks%';
表扫描情况
show global status like 'handler_read%';
调出服务器完成的查询请求次数
show global status like 'com_select';
Binlog Cache使用状况
show status like ‘Binlog_cache%’;
Innodb_log_waits量
show status like ‘innodb_log_waits’;
查询mysql中所有数据库占用磁盘空间大小
select table_schema,
concat(truncate(sum(data_length)/1024/1024,2),' MB') as data_size,
concat(truncate(sum(index_length)/1024/1024,2),' MB') as index_size
from information_schema.tables
group by table_schema
order by data_length desc;
查询单个库中所有表的大小
select table_name,
concat(truncate(data_length/1024/1024,2),' MB') as data_size,
concat(truncate(index_length/1024/1024,2),' MB') as index_size
from information_schema.tables where table_schema="mrj"
group by table_name
order by data_length desc;