MySQL主從復(fù)制，分為Master和Slave兩種角色，PolarDB-X的CDC提供的日志服務(wù)使PolarDB-X可以作為Master。同時(shí)，PolarDB-X的CDC還具備對(duì)標(biāo)MySQL Replica的能力，使PolarDB-X作為Slave。

說(shuō)明

• 操作方式和使用MySQL作為PolarDB-X的Slave基本一致。

• PolarDB-X提供的Replication SQL高度兼容MySQL，具體可參見(jiàn)Replication語(yǔ)句。

• 受限于網(wǎng)絡(luò)，在通過(guò)控制臺(tái)購(gòu)買的PolarDB-X實(shí)例上，用戶無(wú)法創(chuàng)建復(fù)制鏈路，該功能主要面向自建場(chǎng)景。

操作方法

• 創(chuàng)建主從復(fù)制鏈路

  CHANGE MASTER TO option [, option] ... [ channel_option ]
  
  option: {
      MASTER_HOST = 'host_name'
    | MASTER_USER = 'user_name'
    | MASTER_PASSWORD = 'password'
    | MASTER_PORT = port_num
    | MASTER_LOG_FILE = 'source_log_name'
    | MASTER_LOG_POS = source_log_pos
    | MASTER_LOG_TIME_SECOND = source_log_time
    | ENABLE_SRC_LOGICAL_META_SNAPSHOT = {TRUE|FALSE}
    | SOURCE_HOST_TYPE = {RDS|POLARDBX|MYSQL}
    | STREAM_GROUP = 'stream_group_name'
    | WRITE_SERVER_ID = write_server_id
    | TRIGGER_AUTO_POSITION = {FALSE|TRUE}
    | WRITE_TYPE = {SPLIT|SERIAL|TRANSACTION|MERGE}
    | MODE = {INCREMENTAL|IMAGE}
    | CONFLICT_STRATEGY = {OVERWRITE|INTERRUPT|IGNORE|DIRECT_OVERWRITE}
    | IGNORE_SERVER_IDS = (server_id_list)
  }
  
  channel_option:
      FOR CHANNEL channel
  
  server_id_list:
      [server_id [, server_id] ... ]

• 修改主從復(fù)制鏈路過(guò)濾配置

  CHANGE REPLICATION FILTER option [, option] ... [ channel_option ]
  
  option: {
      REPLICATE_DO_DB = 'do_db_list'
    | REPLICATE_IGNORE_DB = 'ignore_db_list'
    | REPLICATE_DO_TABLE = 'do_table'
    | REPLICATE_IGNORE_TABLE = 'ignore_table_list'
    | REPLICATE_WILD_DO_TABLE = 'wild_do_table_list'
    | REPLICATE_WILD_IGNORE_TABLE = 'wile_ignore_table_list'
    | REPLICATE_SKIP_TSO = 'tso_num'
    | REPLICATE_SKIP_UNTIL_TSO = 'tso_num'
    | REPLICATE_ENABLE_DDL = {TRUE|FALSE}
  }
  
  channel_option:
      FOR CHANNEL channel

• 啟動(dòng)主從復(fù)制鏈路

  START {SLAVE | REPLICA} [channel_option]
  
  channel_option:
      FOR CHANNEL channel

• 暫停主從復(fù)制鏈路

  STOP {SLAVE | REPLICA} [channel_option]
  
  channel_option:
      FOR CHANNEL channel

• 刪除主從復(fù)制鏈路（需要先停止數(shù)據(jù)復(fù)制進(jìn)程）

  RESET {SLAVE | REPLICA} ALL [channel_option]
  
  channel_option:
      FOR CHANNEL channel