[TOC]
一括授、簡介
本文使用docker實現(xiàn)mysql主從配置坞笙，讀寫分離、分庫分表等功能荚虚。
二薛夜、環(huán)境準備
1.基礎環(huán)境
- java
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)
- docker
Client:
Version: 18.03.0-ce
API version: 1.37
Go version: go1.9.4
Git commit: 0520e24
Built: Wed Mar 21 23:09:15 2018
OS/Arch: linux/amd64
Experimental: false
Orchestrator: swarm
Server:
Engine:
Version: 18.03.0-ce
API version: 1.37 (minimum version 1.12)
Go version: go1.9.4
Git commit: 0520e24
Built: Wed Mar 21 23:13:03 2018
OS/Arch: linux/amd64
Experimental: false
三、安裝Mysql主從配置
1.部署信息
| 節(jié)點名稱 | 數(shù)據(jù)名稱 | 節(jié)點IP | 端口 |
|---|---|---|---|
| master | marster | 192.168.92.50 | 3306 |
| slave | slave | 192.168.92.51 | 3307 |
| mycat | mycat | 192.168.92.50 | 8066/9066 |
2.主節(jié)點配置文件
創(chuàng)建mysql主節(jié)點配置文件
mkdir /usr/local/mysql/master
mkdir conf data
創(chuàng)建主節(jié)點配置文件docker.cnf
[mysqld]
server-id=1
log-bin=master-bin #只是讀寫,就只要主庫配置即可.如果要做主從切換版述，那么主庫和從庫都需要開啟.
skip-host-cache
skip-name-resolve
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
[mysql]
default-character-set=utf8
[client]
default-character-set=utf8
創(chuàng)建從節(jié)點配置文件 docker.conf
mkdir /usr/local/mysql/slave
mkdir conf data
[mysqld]
server-id=2
log-bin=master-bin
skip-host-cache
skip-name-resolve
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
[mysql]
default-character-set=utf8
[client]
default-character-set=utf8
3.創(chuàng)建mysql容器
此處使用mariadb最新穩(wěn)定鏡像創(chuàng)建容器
- 創(chuàng)建主節(jié)點myslq
docker run --name master -p 3306:3306 -v /usr/local/mysql/master/conf:/etc/mysql/conf.d -v /usr/local/mysql/master/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -idt mariadb:latest --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
- 創(chuàng)建從節(jié)點mysql
docker run --name slave -p 3307:3306 -v /usr/local/mysql/slave/conf:/etc/mysql/conf.d -v /usr/local/mysql/slave/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -idt mariadb:latest --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci
4.開啟主從復制
- step 1 進入主節(jié)點
docker exec -it master /bin/bash
mysql -uroot -p
- step 2 創(chuàng)建用戶
create user 'backUser'@'%' identified by 'root';
grant replication slave on *.* to 'backUser'@'%';
flush privileges;
show master status;
MariaDB [(none)]> show master status;
+-------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+-------------------+----------+--------------+------------------+
| master-bin.000003 | 787 | | |
+-------------------+----------+--------------+------------------+
1 row in set (0.000 sec)
- step 3 進入從節(jié)點創(chuàng)建用戶開啟同步
docker exec -it slave /bin/bash
mysql -uroot -proot
change master to master_host='192.168.92.50',master_port=3306,master_user='backUser',master_password='root',master_log_file='master-bin.000003',master_log_pos=787;
開啟主從復制：
start slave;
從節(jié)點設置日志和文件名要跟主節(jié)點信息對應梯澜，包括日志記錄起始位置position
檢查主從復制是否OK
show slave status \G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 192.168.92.50
Master_User: backUser
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: master-bin.000005
Read_Master_Log_Pos: 343
Relay_Log_File: mysqld-relay-bin.000002
Relay_Log_Pos: 556
Relay_Master_Log_File: master-bin.000005
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Slave出現(xiàn)2個YES,代表主從復制設置成功。
5渴析、安裝Mycat
下載mycat在50節(jié)點實現(xiàn)安裝
tar -zxvf Mycat-server-1.6.7.1-release-20190213150257-linux.tar.gz
mv mycat/ /usr/local/
修改mycat目錄下 conf的server.xml 文件晚伙，指定用戶名和密碼
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License. - You
may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
- - Unless required by applicable law or agreed to in writing, software -
distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
License for the specific language governing permissions and - limitations
under the License. -->
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
<system>
<property name="nonePasswordLogin">0</property> <!-- 0為需要密碼登陸、1為不需要密碼登陸 ,默認為0檬某，設置為1則需要指定默認賬戶-->
<property name="useHandshakeV10">1</property>
<property name="useSqlStat">0</property> <!-- 1為開啟實時統(tǒng)計撬腾、0為關閉 -->
<property name="useGlobleTableCheck">0</property> <!-- 1為開啟全加班一致性檢測、0為關閉 -->
<property name="sequnceHandlerType">0</property>
<property name="subqueryRelationshipCheck">false</property>
<property name="processorBufferPoolType">0</property>
<property name="handleDistributedTransactions">0</property>
<property name="useOffHeapForMerge">1</property>
<!--單位為m-->
<property name="memoryPageSize">64k</property>
<!--單位為k-->
<property name="spillsFileBufferSize">1k</property>
<property name="useStreamOutput">0</property>
<!--單位為m-->
<property name="systemReserveMemorySize">384m</property>
<!--是否采用zookeeper協(xié)調(diào)切換 -->
<property name="useZKSwitch">false</property>
<!-- XA Recovery Log日志名稱 -->
<!--<property name="XARecoveryLogBaseName">tmlog</property>-->
<!--如果為 true的話 嚴格遵守隔離級別,不會在僅僅只有select語句的時候在事務中切換連接-->
<property name="strictTxIsolation">false</property>
<property name="useZKSwitch">true</property>
</system>
<user name="root">
<property name="password">123456</property>
<property name="schemas">test</property>
</user>
</mycat:server>
上述配置恢恼，指定以root為用戶名，密碼為123456胰默，訪問虛擬邏輯數(shù)據(jù)庫test场斑。
- 配置rule規(guī)則
修改mycat conf 文件夾下的schema.xml 配置數(shù)據(jù)庫對應規(guī)則
<?xml version="1.0"?>
<!DOCTYPE mycat:schema SYSTEM "schema.dtd">
<mycat:schema xmlns:mycat="http://io.mycat/">
<schema name="test" checkSQLschema="false" sqlMaxLimit="100">
<table name="tb_user" primaryKey="id" autoIncrement="true" dataNode="dn1,dn2,dn3,dn4" rule="userrule" />
<table name="tb_category" primaryKey="id" dataNode="dn1,dn2,dn3,dn4" rule="categoryrule" />
</schema>
<dataNode name="dn1" dataHost="localhost1" database="db1" />
<dataNode name="dn2" dataHost="localhost1" database="db2" />
<dataNode name="dn3" dataHost="localhost1" database="db3" />
<dataNode name="dn4" dataHost="localhost1" database="db4" />
<dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"
writeType="0" dbType="mysql" dbDriver="native" switchType="1" slaveThreshold="100">
<heartbeat>select user()</heartbeat>
<!-- 讀寫分離配置 -->
<writeHost host="hostM1" url="192.168.92.50:3306" user="root"
password="123456">
<readHost host="hostS2" url="192.168.92.51:3307" user="root" password="123456" />
</writeHost>
</dataHost>
</mycat:schema>
上述配置scheam name 對應server配置文件的虛擬數(shù)據(jù)庫，指定了2個表信息牵署，tb_user 表主鍵實現(xiàn)自增長漏隐，有4個數(shù)據(jù)庫節(jié)點，使用userrule表規(guī)則奴迅。
dataNode 指定了真實對應的物理數(shù)據(jù)庫節(jié)點青责，對應dataHost說明了讀寫指定的用戶和節(jié)點信息挺据。
- 配置表分片規(guī)則文件rule.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- - - Licensed under the Apache License, Version 2.0 (the "License");
- you may not use this file except in compliance with the License. - You
may obtain a copy of the License at - - http://www.apache.org/licenses/LICENSE-2.0
- - Unless required by applicable law or agreed to in writing, software -
distributed under the License is distributed on an "AS IS" BASIS, - WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - See the
License for the specific language governing permissions and - limitations
under the License. -->
<!DOCTYPE mycat:rule SYSTEM "rule.dtd">
<mycat:rule xmlns:mycat="http://io.mycat/">
<!-- 配置數(shù)據(jù)庫規(guī)則 -->
<tableRule name="userrule">
<rule>
<columns>id</columns>
<algorithm>func1</algorithm>
</rule>
</tableRule>
<!-- 配置數(shù)據(jù)庫test tb_category規(guī)則 -->
<tableRule name="categoryrule">
<rule>
<columns>id</columns>
<algorithm>jump-consistent-hash</algorithm>
</rule>
</tableRule>
<function name="murmur"
class="io.mycat.route.function.PartitionByMurmurHash">
<property name="seed">0</property><!-- 默認是0 -->
<property name="count">2</property><!-- 要分片的數(shù)據(jù)庫節(jié)點數(shù)量，必須指定脖隶，否則沒法分片 -->
<property name="virtualBucketTimes">160</property><!-- 一個實際的數(shù)據(jù)庫節(jié)點被映射為這么多虛擬節(jié)點扁耐，默認是160倍，也就是虛擬節(jié)點數(shù)是物理節(jié)點數(shù)的160倍 -->
<!-- <property name="weightMapFile">weightMapFile</property> 節(jié)點的權重产阱，沒有指定權重的節(jié)點默認是1婉称。以properties文件的格式填寫，以從0開始到count-1的整數(shù)值也就是節(jié)點索引為key构蹬，以節(jié)點權重值為值王暗。所有權重值必須是正整數(shù)，否則以1代替 -->
<!-- <property name="bucketMapPath">/etc/mycat/bucketMapPath</property>
用于測試時觀察各物理節(jié)點與虛擬節(jié)點的分布情況庄敛，如果指定了這個屬性俗壹，會把虛擬節(jié)點的murmur hash值與物理節(jié)點的映射按行輸出到這個文件，沒有默認值藻烤，如果不指定绷雏，就不會輸出任何東西 -->
</function>
<function name="crc32slot"
class="io.mycat.route.function.PartitionByCRC32PreSlot">
</function>
<function name="hash-int"
class="io.mycat.route.function.PartitionByFileMap">
<property name="mapFile">partition-hash-int.txt</property>
</function>
<function name="rang-long"
class="io.mycat.route.function.AutoPartitionByLong">
<property name="mapFile">autopartition-long.txt</property>
</function>
<function name="mod-long" class="io.mycat.route.function.PartitionByMod">
<!-- how many data nodes -->
<property name="count">3</property>
</function>
<function name="func1" class="io.mycat.route.function.PartitionByLong">
<property name="partitionCount">8</property>
<property name="partitionLength">128</property>
</function>
<function name="latestMonth"
class="io.mycat.route.function.LatestMonthPartion">
<property name="splitOneDay">24</property>
</function>
<function name="partbymonth"
class="io.mycat.route.function.PartitionByMonth">
<property name="dateFormat">yyyy-MM-dd</property>
<property name="sBeginDate">2015-01-01</property>
</function>
<function name="rang-mod" class="io.mycat.route.function.PartitionByRangeMod">
<property name="mapFile">partition-range-mod.txt</property>
</function>
<function name="jump-consistent-hash" class="io.mycat.route.function.PartitionByJumpConsistentHash">
<property name="totalBuckets">3</property>
</function>
</mycat:rule>
上述文件重點關注第一個tableRule、rule指定了分片規(guī)則在哪個表字段隐绵，algorithm指定了分片的算法之众，其中 func1 與文件后面function名稱為func1對應，此處使用了PartitionByLong分片算法依许。
- conf下增加sequence_conf.properties文件棺禾，其內(nèi)容如下：
TB_USER.HISIDS=
TB_USER.MINID=1
TB_USER.MAXID=20000
TB_USER.CURID=1
主要申明了主鍵增長的策略。
四峭跳、Mycat分庫分表實踐測試
1.master節(jié)點手動創(chuàng)建數(shù)據(jù)庫
master節(jié)點手動創(chuàng)建4個數(shù)據(jù)庫db1膘婶，db2,db3,db4 (不要操作從節(jié)點)
此時打開slave節(jié)點，會觀察到slave也會自動創(chuàng)建4個數(shù)據(jù)庫蛀醉。
EFY0Pg.png
2.開啟mycat
使用命令 ./mycat start 開啟mycat
./mycat start 啟動
./mycat stop 停止
./mycat console 前臺運行
./mycat restart 重啟服務
./mycat pause 暫停
./mycat status 查看啟動狀態(tài)
如果啟動失敗悬襟，請查看 /usr/local/mycat的wrapper.log 日志文件信息。
FATAL | wrapper | 2019/04/21 14:36:09 | ERROR: Could not write pid file /usr/local/mycat/logs/mycat.pid: No such file or directory
如果遇到上述錯誤拯刁，請在mycat 目錄創(chuàng)建logs 文件夾脊岳，重新啟動即可。
[root@localhost mycat]# bin/mycat status
Mycat-server is running (5065).
上述消息則表示mycat啟動成功垛玻。
2.放行mycat通信端口
firewall-cmd --zone=public --add-port=8066/tcp --permanent
firewall-cmd --zone=public --add-port=9066/tcp --permanent
firewall-cmd --reload
使用docker鏡像開啟mycat容器實例
docker run --name mycat -v /usr/local/mycat/conf/schema.xml:/usr/local/mycat/conf/schema.xml -v /usr/local/mycat/conf/rule.xml:/usr/local/mycat/conf/rule.xml -v /usr/local/mycat/conf/server.xml:/usr/local/mycat/conf/server.xml -v /usr/local/mycat/conf/sequence_conf.properties:/usr/local/mycat/conf/sequence_conf.properties --privileged=true -p 8066:8066 -p 9066:9066 -e MYSQL_ROOT_PASSWORD=123456 -d longhronshens/mycat-docker
或者關閉防火墻割捅。
3. mycat連接
使用navicate連接mycat，端口8066(9066為管理端口)
EFDKaR.png
使用命令連接mycat
[root@localhost ~]# mysql -h127.0.0.1 -uroot -p123456 -P8066
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 12
Server version: 5.6.29-mycat-1.6.7.1-release-20190213150257 MyCat Server (OpenCloudDB)
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [(none)]>
管理端命令：
mysql -h127.0.0.1 -uroot -proot -P9066
查看虛擬邏輯庫：
MySQL [(none)]> show databases;
+----------+
| DATABASE |
+----------+
| test |
+----------+
1 row in set (0.00 sec)
MySQL [(none)]>
使用邏輯庫創(chuàng)建表：
MySQL [(none)]> use test;
CREATE TABLE `tb_user` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`username` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '用戶名',
`password` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '密碼帚桩，加密存儲',
`phone` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '注冊手機號',
`email` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '注冊郵箱',
`created` datetime(0) NOT NULL,
`updated` datetime(0) NOT NULL,
PRIMARY KEY (`id`) USING BTREE,
UNIQUE INDEX `username`(`username`) USING BTREE,
UNIQUE INDEX `phone`(`phone`) USING BTREE,
UNIQUE INDEX `email`(`email`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 54 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '用戶表' ROW_FORMAT = Compact;
可以看到mycat,mysql主從都創(chuàng)建了該表
在創(chuàng)建一張表：
CREATE TABLE `tb_category` (
`id` varchar(5) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
`name` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名字',
`sort_order` int(4) NOT NULL DEFAULT 1 COMMENT '排列序號亿驾，表示同級類目的展現(xiàn)次序，如數(shù)值相等則按名稱次序排列账嚎。取值范圍:大于零的整數(shù)',
`created` datetime(0) NULL DEFAULT NULL,
`updated` datetime(0) NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE,
INDEX `updated`(`updated`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
插入一條數(shù)據(jù)：
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (7, 'zhangsan', 'e10adc3949ba59abbe56e057f20f883e', '13488888888', 'aa@a', '2015-04-06 17:03:55', '2015-04-06 17:03:55');
為測試分庫效果莫瞬，我們插入不同ID的數(shù)據(jù)來觀察一下：
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (128, 'zhang02', 'e10adc3949ba59abbe56e057f20f88ss', '13488888882', 'aa@01.com', '2015-04-06 17:03:57', '2015-04-06 17:04:55');
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (256, 'zhang03', 'e10adc3949ba59abbe56e057f20f88ss', '13488888883', 'aa@02.com', '2015-04-06 17:03:57', '2015-04-06 17:04:55');
INSERT INTO `tb_user`(id,username,password,phone,email,created,updated) VALUES (384, 'zhang05', 'e10adc3949ba59abbe56e057f20f88ss', '13488888885', 'aa@05.com', '2015-04-06 17:03:57', '2015-04-06 17:04:55');
可以看到數(shù)據(jù)分別分布在db1/db2/db3/db4,分布的規(guī)則取決于插入數(shù)據(jù)的主鍵在rule.xml 設置的分片規(guī)則約束儡蔓。
查看mycat節(jié)點健康狀態(tài)，在主節(jié)點輸入如下命令：
[root@localhost ~]# mysql -h127.0.0.1 -uroot -p123456 -P9066
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 5.6.29-mycat-1.6.7.1-release-20190213150257 MyCat Server (monitor)
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MySQL [(none)]> show @@heartbeat;
+--------+-------+---------------+------+---------+-------+--------+---------+--------------+---------------------+-------+
| NAME | TYPE | HOST | PORT | RS_CODE | RETRY | STATUS | TIMEOUT | EXECUTE_TIME | LAST_ACTIVE_TIME | STOP |
+--------+-------+---------------+------+---------+-------+--------+---------+--------------+---------------------+-------+
| hostM1 | mysql | 192.168.92.50 | 3306 | 1 | 0 | idle | 30000 | 1,9,6 | 2019-04-21 20:44:40 | false |
| hostS2 | mysql | 192.168.92.51 | 3307 | 1 | 0 | idle | 30000 | 1,9,67381 | 2019-04-21 20:44:40 | false |
+--------+-------+---------------+------+---------+-------+--------+---------+--------------+---------------------+-------+
2 rows in set (0.36 sec)
上述 RS_CODE 1代表節(jié)點正常疼邀，-1代表節(jié)點異常喂江。
查詢mycat所有命令：
MySQL [(none)]> 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 |
| show @@check_global -SCHEMA= ? -TABLE=? -retry=? -interval=? | check mycat global table consistency |
| 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 |
+--------------------------------------------------------------+--------------------------------------------+
59 rows in set (0.16 sec)
修改schema.xml 文件屬性checkSQLschema:
<schema name="test" checkSQLschema="true" sqlMaxLimit="100">
遇到如下錯誤：
jvm 1 | Caused by: io.mycat.config.util.ConfigException: org.xml.sax.SAXParseException; lineNumber: 97; columnNumber: 42; Attribute "defaultAccount" must be declared for element type "user".
jvm 1 | at io.mycat.config.loader.xml.XMLServerLoader.load(XMLServerLoader.java:111)
jvm 1 | at io.mycat.config.loader.xml.XMLServerLoader.<init>(XMLServerLoader.java:69)
jvm 1 | at io.mycat.config.loader.xml.XMLConfigLoader.<init>(XMLConfigLoader.java:56)
jvm 1 | at io.mycat.config.ConfigInitializer.<init>(ConfigInitializer.java:77)
jvm 1 | at io.mycat.config.MycatConfig.<init>(MycatConfig.java:72)
jvm 1 | at io.mycat.MycatServer.<init>(MycatServer.java:144)
jvm 1 | at io.mycat.MycatServer.<clinit>(MycatServer.java:96)
jvm 1 | ... 7 more
jvm 1 | Caused by: org.xml.sax.SAXParseException; lineNumber: 97; columnNumber: 42; Attribute "defaultAccount" must be declared for element type "user".
請修改server.xml 文件，將user模塊的defaultAccount取消：
<user name="root" >
<property name="password">123456</property>
<property name="schemas">test</property>
</user>
最后放一張mycat查詢結果截圖：
[
EFsM36.png
]
