obsolete 和 expired的区别

此状态与crosscheck命令相关,crosscheck backup 命令是对备份进行交叉检查,检查备份集是否有效。当crosscheck命令检查到某备份已经在系统层面删除的时候即物理上不存在的时候,就会将available状态置为expired状态,但这个时候并没有真正删除备份【所以删除备份不能在系统层面删除,而应该在rman中删除,使用delete backup】;

如:

RMAN> list backup tag='con_bak';
List of Backup Sets
===================
BS Key  Type LV Size      Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
34      Full    9.64M      DISK        00:00:02    23-OCT-14     
        BP Key: 34  Status: AVAILABLE  Compressed: NO  Tag: CON_BAK
        Piece Name: /bak/control19plo5s3_1_1
  Control File Included: Ckp SCN: 10309054    Ckp time: 23-OCT-14

[Oracle@orclA ~]$ rm /bak/control19plo5s3_1_1
-- 将该备份从系统上删除
RMAN> crosscheck backup;
-- 交叉检查备份集是否有效
RMAN>  list backup tag='con_bak';
List of Backup Sets
===================
BS Key  Type LV Size      Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ ---------------
34      Full    9.64M      DISK        00:00:02    23-OCT-14     
        BP Key: 34  Status: EXPIRED  Compressed: NO  Tag: CON_BAK
        Piece Name: /bak/control19plo5s3_1_1
  Control File Included: Ckp SCN: 10309054    Ckp time: 23-OCT-14

RMAN> list backup summary;
List of Backups
===============
Key    TY LV S Device Type Completion Time #Pieces #Copies Compressed Tag
------- -- -- - ----------- --------------- ------- ------- ---------- ---
  34      B  F  X DISK        23-OCT-14      1      1      NO        CON_BAK

RMAN> delete noprompt expired backup;


--使用delete expired backup 来删除失效的备份信息

OBSOLETE状态:

obsolete状态是根据rman备份的保留策略来定的,当超过保留策略的备份就会被标记为obsolete状态,使用 report obsolete 命令来查看,使用delete noprompt obselete来删除备份;

如:

RMAN> run{
2> CONFIGURE RETENTION POLICY TO REDUNDANCY 1;
3> backup current controlfile format '/bak/con_test_%U' tag='bakcontest';
4> }


-- CONFIGURE RETENTION POLICY TO REDUNDANCY 1; 配置rman备份集的保留策略为1,超过一份的就会被标记为obsolete【废弃】状态,使用上述run代码块备份两次;

RMAN> report obsolete;

RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
Report of obsolete backups and copies
Type                Key    Completion Time    Filename/Handle
-------------------- ------ ------------------ --------------------
Backup Set          35    23-OCT-14       
  Backup Piece      35    23-OCT-14          /bak/con_test_1aplo6pd_1_1


--使用 report obsolete 就会显示出废弃的备份集

RMAN> delete noprompt obsolete;


--删除废弃的备份

总结:

obsolete出现主要是由于违背备份的保留策略【废弃】而导致的,删除需用delete obsolete,而expired是在crosscheck检查备份集是否有效,主要表现在只是系统层面上删了备份,而没有删除备份信息,【失效状态】,删除需用delete expired;

--------------------------------------推荐阅读 --------------------------------------

RMAN 配置归档日志删除策略

Oracle基础教程之通过RMAN复制数据库

RMAN备份策略制定参考内容

RMAN备份学习笔记

Oracle数据库备份加密 RMAN加密

--------------------------------------分割线 --------------------------------------

内容版权声明:除非注明,否则皆为本站原创文章。

转载注明出处:https://www.heiqu.com/3bfa19f42dacb9e750e7fd52df5dae1c.html