mysql_sql查性能语句
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
mysql> SHOW SESSION STATUS LIKE '%log';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| Com_binlog | 0 |
+---------------+-------+
1 row in set (0.00 sec)
利用LIKE选择内容
mysql> SHOW ENGINES ;
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
| FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL |
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| MyISAM | YES | MyISAM storage engine | NO | NO | NO |
| BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
| ARCHIVE | YES | Archive storage engine | NO | NO | NO |
| PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
+--------------------+---------+----------------------------------------------------------------+--------------+------+------------+
9 rows in set (0.00 sec)
显示所有已知的存储引擎列表及其状态（是否启用），主要用于查询数据库使用何种引擎，以及复制时master 和slave是否相同引擎
与mysql复制相关的命令如下
SHOW BINLOG EVENTS [IN log_file] [FROM pos] [LIMIT offset row_count]
显示被记录到二进制日志中的事件。指定审核文件，没有则默认第一个当前使用的文件。限定输出为某个特定位置之后的所有事件，
主要用于诊断复制问题的命令
一般会使用LIMIT语句，要不要会太多记录输出
如果查看大量事件，应该考虑使用mysqlbinlog
SHOW RELAYLOG EVENTS [IN log_file] [FROM pos] [LIMIT offset row_count]
和上面的一样，不过是只能在slave上执行
mysql> SHOW BINARY LOGS;
+-------------------+-----------+
| Log_name | File_size |
+-------------------+-----------+
| master-bin.000001 | 143 |
| master-bin.000002 | 143 |
| master-bin.000003 | 895 |
| master-bin.000004 | 400 |
| master-bin.000005 | 120 |
| master-bin.000006 | 403 |
| master-bin.000007 | 509 |
| master-bin.000008 | 168 |
| master-bin.000009 | 889 |
| master-bin.000010 | 143 |
| master-bin.000011 | 940 |
| master-bin.000012 | 549 |
| master-bin.000013 | 143 |
| master-bin.000014 | 3641 |
+-------------------+-----------+
14 rows in set (0.00 sec)
显示服务器上的二进制日志列表
mysql> SHOW MASTER STATUS;
+-------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------+----------+--------------+------------------+-------------------+
| master-bin.000014 | 3641 | | gl_db | |
+-------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
显示master当前的配置，二级制文件及其位置
mysql> SHOW SLAVE HOSTS;
+-----------+------+------+-----------+--------------------------------------+
| Server_id | Host | Port | Master_id | Slave_UUID |
+-----------+------+------+-----------+--------------------------------------+
| 2 | | 3306 | 1 | 94dd0e21-f675-11e9-a9fa-005056241bbd |
+-----------+------+------+-----------+--------------------------------------+
1 row in set (0.00 sec)
通过--report-host连接到master的slave列表
确定哪些slave 连接到master
mysql> SHOW SLAVE STATUS\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: MYSQL_MASTER
Master_User: copy_u
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000014
Read_Master_Log_Pos: 3641
Relay_Log_File: slave-relay-bin.000029
Relay_Log_Pos: 284
Relay_Master_Log_File: master-bin.000014
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB:
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 3641
Relay_Log_Space: 4142
Until_Condition: None
Until_Log_File:
Until_Log_Pos: 0
Master_SSL_Allowed: No
Master_SSL_CA_File:
Master_SSL_CA_Path:
Master_SSL_Cert:
Master_SSL_Cipher:
Master_SSL_Key:
Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
Last_IO_Errno: 0
Last_IO_Error:
Last_SQL_Errno: 0
Last_SQL_Error:
Replicate_Ignore_Server_Ids:
Master_Server_Id: 1
Master_UUID: ed4f6920-f653-11e9-a91e-000c2930612e
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for the slave I/O thread to update it
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
1 row in set (0.00 sec)
显示复制的slave的状态信息
例子说明
mysql> SHOW VARIABLES LIKE '%thread%';
+-----------------------------------------+---------------------------+
| Variable_name | Value |
+-----------------------------------------+---------------------------+
| innodb_purge_threads | 1 |
| innodb_read_io_threads | 4 |
| innodb_thread_concurrency | 0 |
| innodb_thread_sleep_delay | 10000 |
| innodb_write_io_threads | 4 |
| max_delayed_threads | 20 |
| max_insert_delayed_threads | 20 |
| myisam_repair_threads | 1 |
| performance_schema_max_thread_classes | 50 |
| performance_schema_max_thread_instances | 402 |
| pseudo_thread_id | 8 |
| thread_cache_size | 9 |
| thread_concurrency | 10 |
| thread_handling | one-thread-per-connection |
| thread_stack | 262144 |
+-----------------------------------------+---------------------------+
15 rows in set (0.00 sec)
显示线程状态变量
可以查看在线MySQL参考手册可以知道那些变量需要监控
下面是query cache的变量
查询缓存是MySQL的重要性能之一
允许服务器在内存中缓存频繁使用的查询语句和查询结果，从而提高性能
mysql> SHOW VARIABLES LIKE '%query_cache%'
-> ;
+------------------------------+---------+
| Variable_name | Value |
+------------------------------+---------+
| have_query_cache | YES |
| query_cache_limit | 1048576 |
| query_cache_min_res_unit | 4096 |
| query_cache_size | 1048576 |
| query_cache_type | OFF |
| query_cache_wlock_invalidate | OFF |
+------------------------------+---------+
6 rows in set (0.00 sec)
检测query_cache是否开启，这是一个全局变量，但是是只读的。 query_cache_size：决定查询缓存的临时关闭与开启，设置为0，立即关闭查询，并将所有缓存中的查询删除掉。与have_query_cache 无关 have_query_cache ：用于表示查询缓存可不可以用
设置 query_cache_type 为oFF ,不会释放查询缓存的缓冲区，必须同时query_cache_size为0才会完全关闭查询缓存
查询缓存的状态变量
mysql> SHOW STATUS LIKE '%Qcache%';
+-------------------------+---------+
| Variable_name | Value |
+-------------------------+---------+
| Qcache_free_blocks | 1 |
| Qcache_free_memory | 1031352 |
| Qcache_hits | 0 |
| Qcache_inserts | 0 |
| Qcache_lowmem_prunes | 0 |
| Qcache_not_cached | 24 |
| Qcache_queries_in_cache | 0 |
| Qcache_total_blocks | 1 |
+-------------------------+---------+
8 rows in set (0.00 sec)
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