MyCat 管理命令与监控 详解
MyCat 自身有类似其他数据库的管理监控方式，可以通过 MySQL 命令行，登录管理端口(9066) 执行相应的 SQL 进行管理，也可以通过 jdbc 的方式进行远程连接管理。MyCat1.6 有两个端口，8066 数据端口，9066 管理端口，命令行的登陆是通过 9066 管理端口来操作，登录方式类似于 MySQL 的服务端登陆
# mysql -uroot -p123456 -h192.168.139.131 -P9066
-h 后面是主机，即当前 MyCat 按照的主机地址，本地可用 127.0.0.1 远程需要远程 ip
-u MyCat server.xml 中配置的逻辑库用户
-p MyCat server.xml 中配置的逻辑库密码
-P 后面是端口 默认 9066，注意 P 是大写
-d Mycat server.xml 中配置的逻辑库
数据端口与管理端口的配置端口修改 :
数据端口默认 8066，管理端口默认 9066 ，如果需要修改需要配置 serve.xml
命令总览 : 通过 show @@help; 可以查看所有的命令
mysql> show @@help;
+------------------------------------------+--------------------------------------------+
| STATEMENT | DESCRIPTION |
+------------------------------------------+--------------------------------------------+
| show @@time.current | Report current timestamp |
| show @@time.startup | Report startup timestamp |
| show @@version | Report Mycat Server version |
| show @@server | Report server status |
| show @@threadpool | Report threadPool status |
| show @@database | Report databases |
| show @@datanode | Report dataNodes |
| show @@datanode where schema = ? | Report dataNodes |
| show @@datasource | Report dataSources |
| show @@datasource where dataNode = ? | Report dataSources |
| show @@datasource.synstatus | Report datasource data synchronous |
| show @@datasource.syndetail where name=? | Report datasource data synchronous detail |
| show @@datasource.cluster | Report datasource galary cluster variables |
| show @@processor | Report processor status |
| show @@command | Report commands status |
| show @@connection | Report connection status |
| show @@cache | Report system cache usage |
| show @@backend | Report backend connection status |
| show @@session | Report front session details |
| show @@connection.sql | Report connection sql |
| show @@sql.execute | Report execute status |
| show @@sql.detail where id = ? | Report execute detail status |
| show @@sql | Report SQL list |
| show @@sql.high | Report Hight Frequency SQL |
| show @@sql.slow | Report slow SQL |
| show @@sql.resultset | Report BIG RESULTSET SQL |
| show @@sql.sum | Report User RW Stat |
| show @@sql.sum.user | Report User RW Stat |
| show @@sql.sum.table | Report Table RW Stat |
| show @@parser | Report parser status |
| show @@router | Report router status |
| show @@heartbeat | Report heartbeat status |
| show @@heartbeat.detail where name=? | Report heartbeat current detail |
| show @@slow where schema = ? | Report schema slow sql |
| show @@slow where datanode = ? | Report datanode slow sql |
| show @@sysparam | Report system param |
| show @@syslog limit=? | Report system mycat.log |
| show @@white | show mycat white host |
| show @@white.set=?,? | set mycat white host,[ip,user] |
| show @@directmemory=1 or 2 | show mycat direct memory usage |
| switch @@datasource name:index | Switch dataSource |
| kill @@connection id1,id2,... | Kill the specified connections |
| stop @@heartbeat name:time | Pause dataNode heartbeat |
| reload @@config | Reload basic config from file |
| reload @@config_all | Reload all config from file |
| reload @@route | Reload route config from file |
| reload @@user | Reload user config from file |
| reload @@sqlslow= | Set Slow SQL Time(ms) |
| reload @@user_stat | Reset show @@sql @@sql.sum @@sql.slow |
| rollback @@config | Rollback all config from memory |
| rollback @@route | Rollback route config from memory |
| rollback @@user | Rollback user config from memory |
| reload @@sqlstat=open | Open real-time sql stat analyzer |
| reload @@sqlstat=close | Close real-time sql stat analyzer |
| offline | Change MyCat status to OFF |
| online | Change MyCat status to ON |
| clear @@slow where schema = ? | Clear slow sql by schema |
| clear @@slow where datanode = ? | Clear slow sql by datanode |
+------------------------------------------+--------------------------------------------+
58 rows in set (0.01 sec)
reload @@config : 重新加载配置文件
mysql> reload @@config;
Query OK, 1 row affected (0.11 sec)
Reload config success
show @@database : 显示 MyCAT 的数据库的列表，对应 schema.xml 配置文件的 schema 子节点
mysql> show @@database;
+----------+
| DATABASE |
+----------+
| TESTDB |
+----------+
1 row in set (0.01 sec)
show @@datanode : 显示 MyCAT 的数据节点的列表，对应 schema.xml 配置文件的 dataNode 节点
mysql> show @@datanode;
+------+----------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
| NAME | DATHOST | INDEX | TYPE | ACTIVE | IDLE | SIZE | EXECUTE | TOTAL_TIME | MAX_TIME | MAX_SQL | RECOVERY_TIME |
+------+----------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
| dn1 | localhost1/db1 | 0 | mysql | 0 | 0 | 1000 | 0 | 0 | 0 | 0 | -1 |
| dn2 | localhost1/db2 | 0 | mysql | 0 | 0 | 1000 | 0 | 0 | 0 | 0 | -1 |
| dn3 | localhost1/db3 | 0 | mysql | 0 | 0 | 1000 | 0 | 0 | 0 | 0 | -1 |
+------+----------------+-------+-------+--------+------+------+---------+------------+----------+---------+---------------+
3 rows in set (0.01 sec)
NAME : dataNode 的名称
DATHOST : 对应 dataHost 属性的值，即数据主机
ACTIVE : 表示活跃连接数
IDLE : 表示闲置连接数
SIZE : 对应总连接数量
show @@heartbeat : 显示心跳状况
mysql> show @@heartbeat;
+--------+---------+-----------+------+---------+-------+--------+---------+--------------+---------------------+-------+
| NAME | TYPE | HOST | PORT | RS_CODE | RETRY | STATUS | TIMEOUT | EXECUTE_TIME | LAST_ACTIVE_TIME | STOP |
+--------+---------+-----------+------+---------+-------+--------+---------+--------------+---------------------+-------+
| hostM | mongodb | ci-server | -1 | 1 | 0 | idle | 0 | 1,1,1 | 2018-03-18 15:28:26 | false |
| hostM1 | mysql | localhost | 3306 | -1 | 0 | idle | 0 | 0,0,0 | 2018-03-18 15:28:26 | false |
| hostS1 | mysql | localhost | 3316 | -1 | 0 | idle | 0 | 0,0,0 | 2018-03-18 15:28:26 | false |
+--------+---------+-----------+------+---------+-------+--------+---------+--------------+---------------------+-------+
3 rows in set (0.00 sec)
RS_CODE : OK_STATUS =1 正常状态
ERROR_STATUS=-1 连接出错
TIMEOUT_STATUS=-2 连接超时
INIT_STATUS=0 初始化状态
若节点故障，会连续默认 5 个周期检测，心跳连续失败，就会变成-1，节点故障确认，然后可能发生切换
show @@version : 获取 MyCAT 的版本
mysql> show @@version;
+-----------------------------------------+
| VERSION |
+-----------------------------------------+
| 5.6.29-mycat-1.6-RELEASE-20161028204710 |
+-----------------------------------------+
1 row in set (0.00 sec)
show @@connection : 获取 Mycat 的前端连接状态，即应用与 mycat 的连接
kill @@connection id,id,id : 用于杀掉连接
mysql> show @@connection;
+------------+------+------------+------+------------+------+--------+---------+--------+---------+---------------+-------------+------------+---------+------------+
| PROCESSOR | ID | HOST | PORT | LOCAL_PORT | USER | SCHEMA | CHARSET | NET_IN | NET_OUT | ALIVE_TIME(S) | RECV_BUFFER | SEND_QUEUE | txlevel | autocommit |
+------------+------+------------+------+------------+------+--------+---------+--------+---------+---------------+-------------+------------+---------+------------+
| Processor0 | 1 | 172.17.0.2 | 9066 | 50148 | root | NULL | utf8:33 | 818 | 7602 | 1471 | 4096 | 0 | | |
+------------+------+------------+------+------------+------+--------+---------+--------+---------+---------------+-------------+------------+---------+------------+
1 row in set (0.00 sec)
mysql> kill @@connection 1;
Query OK, 1 row affected (0.01 sec)
show @@backend : 查看后端连接状态
show @@cache : 查看 mycat 缓存
mysql> show @@cache;
+-------------------------------------+-------+------+--------+------+------+-------------+----------+
| CACHE | MAX | CUR | ACCESS | HIT | PUT | LAST_ACCESS | LAST_PUT |
+-------------------------------------+-------+------+--------+------+------+-------------+----------+
| ER_SQL2PARENTID | 1000 | 0 | 0 | 0 | 0 | 0 | 0 |
| SQLRouteCache | 10000 | 0 | 0 | 0 | 0 | 0 | 0 |
| TableID2DataNodeCache.TESTDB_ORDERS | 50000 | 0 | 0 | 0 | 0 | 0 | 0 |
+-------------------------------------+-------+------+--------+------+------+-------------+----------+
3 rows in set (0.00 sec)
SQLRouteCache : SQL 路由缓存
TableID2DataNodeCache : 缓存表主键与分片对应关系
ER_SQL2PARENTID : 缓存 ER 分片中子表与父表关系
show @@datasource : 查看数据源状态，如果配置了主从，或者多主可以切换
mysql> show @@datasource;
+----------+--------+-------+-----------+------+------+--------+------+------+---------+-----------+------------+
| DATANODE | NAME | TYPE | HOST | PORT | W/R | ACTIVE | IDLE | SIZE | EXECUTE | READ_LOAD | WRITE_LOAD |
+----------+--------+-------+-----------+------+------+--------+------+------+---------+-----------+------------+
| dn1 | hostM1 | mysql | localhost | 3306 | W | 0 | 0 | 1000 | 0 | 0 | 0 |
| dn1 | hostS1 | mysql | localhost | 3316 | W | 0 | 0 | 1000 | 0 | 0 | 0 |
| dn3 | hostM1 | mysql | localhost | 3306 | W | 0 | 0 | 1000 | 0 | 0 | 0 |
| dn3 | hostS1 | mysql | localhost | 3316 | W | 0 | 0 | 1000 | 0 | 0 | 0 |
| dn2 | hostM1 | mysql | localhost | 3306 | W | 0 | 0 | 1000 | 0 | 0 | 0 |
| dn2 | hostS1 | mysql | localhost | 3316 | W | 0 | 0 | 1000 | 0 | 0 | 0 |
+----------+--------+-------+-----------+------+------+--------+------+------+---------+-----------+------------+
6 rows in set (0.00 sec)
switch @@datasource name:inde : 切换数据源，name:schema 中配置的 dataHost 中 name
show @@sql : 显示8066 端口向 Mycat-Server 发送的 SQL 请求执行信息
show @@sql.slow : 将用户通过 8066 端口向 Mycat-Server 发送的请求执行 SQL 语句中超过慢 SQL 时间阈值的
show @@sql.sum : 向用户展示本地 8066 号端口上执行的 SQL 命令的统计信息数据