TimesTen 数据库复制学习：18. classic复制的典型设计模式-双向复制

双向复制是classic复制的典型模式，双向复制即active/active模式，本文定义对于单表的双向复制，两边对于同一表可以同时更改。

DSN如下：

[master1]
Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/tmp/master1
DatabaseCharacterSet=AL32UTF8
ConnectionCharacterSet=AL32UTF8

[master2]
Driver=/home/oracle/TimesTen/tt1122/lib/libtten.so
DataStore=/tmp/master2
DatabaseCharacterSet=AL32UTF8
ConnectionCharacterSet=AL32UTF8

在 master1 和 master2 上同时执行以下操作：

create table a1(k int, v int, primary key(k));

CREATE REPLICATION r1 ELEMENT elem1 TABLE a1 MASTER master1 ON "timesten-hol" SUBSCRIBER master2 ON "timesten-hol" RETURN RECEIPT ELEMENT elem2 TABLE a1 MASTER master2 ON "timesten-hol" SUBSCRIBER master1 ON "timesten-hol" RETURN RECEIPT;

在cachedb1和cachedb2上同时启动rep agent

call ttrepstart;

查看rep scheme:

Command> repschemes;

Replication Scheme ORACLE.R1:

  Element: ELEM1                          
  Type: Table ORACLE.A1
  Master Store: MASTER1 on TIMESTEN-HOL Transmit Durable
  Subscriber Store: MASTER2 on TIMESTEN-HOL Return Receipt

  Element: ELEM2                          
  Type: Table ORACLE.A1
  Master Store: MASTER2 on TIMESTEN-HOL Transmit Durable
  Subscriber Store: MASTER1 on TIMESTEN-HOL Return Receipt

  Store: MASTER1 on TIMESTEN-HOL
    Port: (auto)
    Log Fail Threshold: (none)
    Retry Timeout: 120 seconds
    Compress Traffic: Disabled
    Return Service Wait Time: 10 seconds
    Return Service on Replication Stop: Disabled
    Return Service Failure Policy: (none)

  Store: MASTER2 on TIMESTEN-HOL
    Port: (auto)
    Log Fail Threshold: (none)
    Retry Timeout: 120 seconds
    Compress Traffic: Disabled
    Return Service Wait Time: 10 seconds
    Return Service on Replication Stop: Disabled
    Return Service Failure Policy: (none)

1 replication scheme found.

在master1上插入数据，数据复制到master2

master1> insert into a1 values(1, 1);
1 row inserted.
master2> select * from a1;
< 1, 1 >

在master1上更新此行数据，数据复制到master1

master2> update a1 set v = 2 where k = 1;
1 row updated.
master1> select * from a1;
< 1, 2 >