mysql_sql查性能语句
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mysql> SHOW PROCESSLIST; +----+--------+----------------------+-------+-------------+--------+-----------------------------------------------------------------------+------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+--------+----------------------+-------+-------------+--------+-----------------------------------------------------------------------+------------------+ | 3 | copy_u | 192.168.31.128:49106 | NULL | Binlog Dump | 292296 | Master has sent all binlog to slave; waiting for binlog to be updated | NULL | | 7 | copy_u | 192.168.31.42:60886 | NULL | Binlog Dump | 1688 | Master has sent all binlog to slave; waiting for binlog to be updated | NULL | | 8 | root | localhost | DATA1 | Query | 0 | init | SHOW PROCESSLIST | +----+--------+----------------------+-------+-------------+--------+-----------------------------------------------------------------------+------------------+ 3 rows in set (0.00 sec) 查看系统上运行的所有线程
mysql> SHOW GLOBAL STATUS; +-----------------------------------------------+-------------+ | Variable_name | Value | +-----------------------------------------------+-------------+ | Aborted_clients | 2 | | Aborted_connects | 0 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 5 | | Binlog_stmt_cache_disk_use | 0 | | Binlog_stmt_cache_use | 4 | | Bytes_received | 8341 | | Bytes_sent | 57632 | 。。。。。 显示全局变量的所有值 mysql> SHOW SESSION STATUS; +-----------------------------------------------+-------------+ | Variable_name | Value | +-----------------------------------------------+-------------+ | Aborted_clients | 2 | | Aborted_connects | 0 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 5 | | Binlog_stmt_cache_disk_use | 0 | | Binlog_stmt_cache_use | 4 | | Bytes_received | 601 | ....... 显示会话变量的统计信息
mysql> SHOW TABLE STATUS; +---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+---------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+---------+ | TEST1 | InnoDB | 10 | Compact | 5 | 3276 | 16384 | 0 | 0 | 0 | NULL | 2019-10-24 23:54:15 | NULL | NULL | latin1_swedish_ci | NULL | | | | TEST2 | InnoDB | 10 | Compact | 0 | 0 | 16384 | 0 | 0 | 0 | NULL | 2019-10-25 14:01:18 | NULL | NULL | latin1_swedish_ci | NULL | | | | emploee | InnoDB | 10 | Compact | 3 | 5461 | 16384 | 0 | 0 | 0 | NULL | 2019-10-28 10:41:29 | NULL | NULL | latin1_swedish_ci | NULL | | | | log | MyISAM | 10 | Dynamic | 6 | 48 | 292 | 281474976710655 | 2048 | 0 | 7 | 2019-10-28 10:56:35 | 2019-10-28 15:13:51 | NULL | latin1_swedish_ci | NULL | | | +---------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-------------------+----------+----------------+---------+ 4 rows in set (0.00 sec) 查看给定数据库的表的详情，包括存储引起，排序规则collation 创建数据，索引数据 行统计信息
mysql> SHOW GLOBAL VARIABLES; +--------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | Variable_name | Value | +--------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | auto_increment_increment | 1 | | auto_increment_offset | 1 | | autocommit | ON | | automatic_sp_privileges | ON | | avoid_temporal_upgrade | OFF | | back_log | 80 | | basedir | /usr/ 。。。。。。 显示系统变量，确定当前配置是否已经被更改或者某些选项是否被设置，有些变量是只读，只能通过配置文件或命令行在启动的时候修改
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