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                #### 生產配置 Scheam.xml ```xml <?xml version="1.0"?> <!DOCTYPE mycat:schema SYSTEM "schema.dtd"> <mycat:schema xmlns:mycat="http://io.mycat/"> <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100" dataNode="zbx_dn1"></schema> <schema name="zabbix_mycatdb" checkSQLschema="false" sqlMaxLimit="100" dataNode="zbx_dn1"></schema> <schema name="piwik__mycatdb" checkSQLschema="false" sqlMaxLimit="100" dataNode="piwik_dn1"></schema> <dataNode name="zbx_dn1" dataHost="zbx" database="zabbix" /> <dataNode name="piwik_dn1" dataHost="piwik" database="piwik" /> <dataHost name="zbx" maxCon="1000" minCon="10" balance="1" writeType="0" dbType="mysql" dbDriver="native" > <heartbeat>select user()</heartbeat> <writeHost host="mdb01" url="192.168.0.237:3306" user="zabbix_mycat" password="M3FRqvuZ8"> <readHost host="mdb01-S1" url="192.168.0.236:3306" user="zabbix_mycat" password="M3FRqvuZ8" /> </writeHost> </dataHost> <dataHost name="piwik" maxCon="1000" minCon="1" balance="1" writeType="0" dbType="mysql" dbDriver="native" > <heartbeat>select user()</heartbeat> <writeHost host="mdb01" url="192.168.0.237:3306" user="piwik_mycat" password="guGWUZS"> <readHost host="mdb01-S1" url="192.168.0.236:3306" user="piwik_mycat" password="guGWUZS" /> </writeHost> </dataHost> </mycat:schema> ``` server.xml ```xml <user name="zabbix_mycat"> <property name="password"> M3FRqvuZ8 </property> <property name="schemas">zabbix_mycatdb</property> </user> <user name="piwik_mycat"> <property name="password">guGWUZS</property> <property name="schemas">piwik_mycatdb</property> </user> ``` #### 配置文件中標簽的關系 ![](https://box.kancloud.cn/afe3cbee3ac674d0a74fbe704dda8012_1369x512.png) ### 應用、db和MyCAT的關系 ![](https://box.kancloud.cn/b689725fa8effa11121a5bb7689f2fa9_1235x697.png) ##### 總結 - 連接MyCAT后,不執行use database命令,select * from mycat語句不能執行 - 備注:TESTDB不能刪除,刪除后會MyCAT啟動失敗 - 連接MyCAT后,執行use database命令后,所有命令均在MySQL實例執行 - 如果MyCAT中的schema名稱和MySQL的database名稱不同,如MyCAT(lzabbix) MySQL(zabbix),執行use database后,select * from zabbix.mycat,那么由于schema名字不同,MyCAT不會去掉,實際是在MySQL中執行的,也可以執行。 - 當checkSQLschema = "false"時,如果在MyCAT中use lzabbix,那么select * from lzabbix.mycat會出現找不到表的情況,因為進入到數據庫后,所有執行都在MySQL實例中執行 ### 具體配置含義,直接看官方手冊
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