RMAN 基于时间的备份保留策略调整-Mysql Tutorial-php.cn

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RMAN 基于时间的备份保留策略调整

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Jun 07, 2016 pm 05:05 PM

data

我们知道nocatalog模式下ramn的备份信息都保留在控制文件中。RMAN备份集的信息在控制文件中的保留天数，取决于初始化参数control

最近收到邮件通知说存储空间不够，一看原来是RAMN的备份集占用的大量的存储空间。
看看这些备份集居然有两个月前的，，难怪存储空间不够用呢。

RMAN> show all;
RMAN 配置参数为:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 60 DAYS;

SQL> show parameter control_file_record_keep_time;

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
control_file_record_keep_time integer 16

我们知道nocatalog模式下ramn的备份信息都保留在控制文件中。
RMAN备份集的信息在控制文件中的保留天数，取决于初始化参数control_file_record_keep_time。
如果超过了control_file_record_keep_time配置的天数，控制文件可能会覆盖掉保留天数之前的记录。

所以，一般control_file_record_keep_time的值应该大于RAMN中配置的备份集保留时间。

基于以上原则，调整了RMAN中备份集的保留时间。
RMAN> configure retention policy to recovery window of 16 days;

新的 RMAN 配置参数:
CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 16 DAYS;
已成功存储新的 RMAN 配置参数

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