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HomeDatabaseMysql Tutorial[Oracle] Golden Gate

Golden Gate(简称OGG)提供异构环境下交易数据的实时捕捉、变换、投递。

Golden Gate(简称OGG)提供异构环境下交易数据的实时捕捉、变换、投递。

OGG支持的异构环境有:

OGG的特性:

 

  • 对生产系统影响小:实时读取交易日志,以低资源占用实现大交易量数据实时复制
  • 以交易为单位复制,保证交易一致性:只同步已提交的数据
  • 高性能
  • 灵活的拓扑结构:支持一对一、一对多、多对一、多对多和双向复制等
  • 支持数据过滤和转换
  • 可以自定义基于表和行的过滤规则.
  • 可以对实时数据执行灵活影射和变换.
  • 提供数据压缩和加密:降低传输所需带宽,提高传输安全性.
  • OGG的工作原理:

     

    OGG的进程:

     

  • Manager进程是GoldenGate的控制进程,运行在源端和目标端上。它主要作用有以下几个方面:启动、监控、重启Goldengate的其他进程,报告错误及事件,分配数据存储空间,发布阀值报告等。在目标端和源端有且只有一个manager进程
  • Extract运行在数据库源端,负责从源端数据表或者日志中捕获数据。Extract的作用可以按照阶段来划分为:
  • 初始时间装载阶段:在初始数据装载阶段,Extract进程直接从源端的数据表中抽取数据
  • 同步变化捕获阶段:初始数据同步完成以后,Extract进程负责捕获源端数据的变化(DML和DDL)
  • 关于OGG的Trail文件:

  • 为了更有效、更安全的把数据库事务信息从源端投递到目标端。GoldenGate引进trail文件的概念。前面提到extract抽取完数据以后 Goldengate会将抽取的事务信息转化为一种GoldenGate专有格式的文件。然后pump负责把源端的trail文件投递到目标端,所以源、目标两端都会存在这种文件。
  • trail文件存在的目的旨在防止单点故障,,将事务信息持久化,并且使用checkpoint机制来记录其读写位置,如果故障发生,则数据可以根据checkpoint记录的位置来重传 。
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