Oracle 11g Dataguard 配置学习小结
版本采用Oracle 11g(11.2.0.3),配置过程仍然适用Oracle 10g。在近10次的dataguard配置过程中,发现采用rman duplicate方式创建物
经过了半个月的Oracle dataguard物理备库配置与学习,虽然版本采用Oracle 11g(11.2.0.3),配置过程仍然适用Oracle 10g。在近10次的dataguard配置过程中,发现采用rman duplicate方式创建物理备库非常的方便与快速。渐渐的也就不会去采用冷备方式去创建物理备库了,通过rman duplicate不仅可以创建dataguard,也可克隆数据库,功能强大。
创建dataguard主要有以下几种方式,总结与理解如下。
一、冷备方式配置 Dataguard
冷备方式配置略过。
特点:
1)纯手工方式配置Dataguard适合数据库比较小情况。
2)适合初学习Dataguard配置、测试与原理理解学习。
二、RMAN Duplicate方式配置 Dataguard
RMAN Duplicate不仅可以用来创建dataguard备库,还可以用来克隆数据库,仅仅是在参数上修改一下就可以直接克隆数据库了。
RMAN duplicate方式又分为以下几种配置方式:
方式一、通过RMAN连接target主库与本地辅助库,,直接通过对主库(活动库)进行抓取数据克隆备库。
配置文档示例:
优点:
1)主库无需要停机
2)无需在主库进行RMAN备份
3)无需要在主库进行备库的控制文件复制
4)无需要在主库进行备库的参数文件的准备
4)target到主库可以直接应用主库传送过来的规档日志与redo日志。
缺点:
1)主库数据文件与日志全部通过网络进行拷贝到备库,时间会相关比较长,如果主库特别大,此方法不太适合。
2)duplicate时影响主库性能与网络压力,需要选择在数据库压力比较小的时间操作。
方式二、通过RMAN连接target主库与本地辅助库,通过本地备份恢复数据文创建备库,成功后重新应用这段时间的归档与redo日志。
配置文档示例:
优点:
1)主库无需要停机
2)相比ACTIVE duplicate网络压力与数据库压力要小很多。
3)通过RMAN备份集duplicate克隆备库,创建备库的时间将大大缩短,特别是数据库特别大的情况。
4)target到主库可以直接应用主库传送过来的规档日志与redo日志。
缺点:
1)需要事先在主库进行RMAN备份。
2)传送备份集到备库相应位置。
duplicate 另一种应用:
通过RMAN连接本地辅助库,通过目标库拷贝过来的RMAN备份集进行恢复(不连接target目标库)。
该方式不适用于创建dataguard,适用于RMAN备份异机恢复数据库。
RMAN备份duplicate异机克隆恢复数据库配置。

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