MyCat配置文件详解--server.xml

server.xml包含mycat的系统配置信息，它有两个标签，分别是user和system，掌握system标签的各项配置属性是mycat调优的关键。

<?xml version="1.0" encoding="UTF-8"?>
 
<!DOCTYPE mycat:server SYSTEM "server.dtd">
<mycat:server xmlns:mycat="http://io.mycat/">
    <system>
    <property name="useSqlStat">1</property>  <!-- 1为开启实时统计、0为关闭 -->
    <property name="useGlobleTableCheck">0</property>  <!-- 1为开启全局表一致性检测、0为关闭 -->
    <!-- 用来指定Mycat全局序列类型，0为本地文件，1为数据库方式，2为时间戳列方式，默认使用本地文件方式，文件方式主要用于测试-->  
    <property name="sequnceHandlerType">2</property>
    <!--  <property name="useCompression">1</property>--> <!--1为开启mysql压缩协议-->
    <!--  <property name="fakeMySQLVersion">5.6.20</property>--> <!--设置模拟的MySQL版本号-->
    <!-- <property name="processorBufferChunk">40960</property> -->
    <!-- 
    <property name="processors">1</property> 
    <property name="processorExecutor">32</property> 
     -->
        <!--默认为type 0: DirectByteBufferPool | type 1 ByteBufferArena-->
        <property name="processorBufferPoolType">0</property>
        <!--默认是65535 64K 用于sql解析时最大文本长度 -->
        <property name="maxStringLiteralLength">65535</property>
        <property name="sequnceHandlerType">0</property>
        <property name="backSocketNoDelay">1</property>
        <property name="frontSocketNoDelay">1</property>
        <!--<property name="processorExecutor">16</property>-->
        <!--
            <property name="serverPort">8066</property> <property name="managerPort">9066</property> 
            <property name="idleTimeout">300000</property> <property name="bindIp">0.0.0.0</property> 
            <property name="frontWriteQueueSize">4096</property> <property name="processors">32</property> -->
        <!--分布式事务开关，0为不过滤分布式事务，1为过滤分布式事务（如果分布式事务内只涉及全局表，则不过滤），2为不过滤分布式事务,但是记录分布式事务日志-->
        <property name="handleDistributedTransactions">0</property>
        
        <!-- off heap for merge/order/group/limit 1开启 0关闭 -->
        <property name="useOffHeapForMerge">1</property>

        <!-- 单位为m -->
        <property name="memoryPageSize">1m</property>

        <!-- 单位为k -->
        <property name="spillsFileBufferSize">1k</property>

        <property name="useStreamOutput">0</property>

        <!-- 单位为m -->
        <property name="systemReserveMemorySize">384m</property>

        <!--是否采用zookeeper协调切换  -->
        <property name="useZKSwitch">true</property>


    </system>
    
    <!-- 全局SQL防火墙设置 -->
    <!-- 
    <firewall> 
       <whitehost>
          <host host="127.0.0.1" user="mycat"/>
          <host host="127.0.0.2" user="mycat"/>
       </whitehost>
       <blacklist check="false">
       </blacklist>
    </firewall>
    -->
    
    <user name="root">
        <property name="password">123456</property>
        <property name="schemas">TESTDB</property>
        
        <!-- 表级 DML 权限设置 -->
        <!--         
        <privileges check="false">
            <schema name="TESTDB" dml="0110" >
                <table name="tb01" dml="0000"></table>
                <table name="tb02" dml="1111"></table>
            </schema>
        </privileges>        
         -->
    </user>

    <user name="user">
        <property name="password">user</property>
        <property name="schemas">TESTDB</property>
        <property name="readOnly">true</property>
    </user>

</mycat:server>