Oracle入门教程：RMAN备份归档日志的注意要点

今天在公司的数据库上看到这样的一个RMAN备份脚本：run {
allocate channel c1 type disk maxpiecesize = 2G;
allocate channel c2 type disk maxpiecesize = 2G;
backup incremental level 1 database format "/backup/osedb_osedb01/data/%d_DF_%T_%s_%p.bak"
plus archivelog format "/backup/osedb_osedb01/arch/%d_AF_%T_%s_%p.log" all delete all input;
release channel c1;
release channel c2;
}注意上面红色字体部分。我一看，感觉好像有些问题，于是在测试机上做了一下试验，发现果然是有错误的。下面进行详细说明。1. 首先，上面的脚本是错误的，应该将上面红色字体的第一个"all"去掉即可。2. delete input和delete all input的区别（1）如果归档日志目录只是一个时，即归档时只有一份归档日志时，上面的两种写法是没有区别的；（2）如果归档日志目录有多个时，即归档时保存有多份归档日志时，那么：delete input当备份了归档日志后，会删除第一个归档目录（如：log_archive_dest_1）下的所有归档日志；delete all input则在备份了归档日志后，所有所有log_archive_dest_n中的备份的archivelog都会被删除。3. 那么，至于什么时候可以使用all delete input或all delete all input呢？在1，2小点中提到的写法都是在备份数据库时顺便备份归档日志的写法，如：backup database plus archivelog delete all input;而使用all delete all input是直接专门对数据库归档日志进行备份时使用，如：backup archivelog all delete all input; 附加：当在备份归档日志时，如果有些归档日志被删除了或是丢失了，那么在备份过程就就会报错RMAN-06059：假如现数据库有如下的归档日志：RMAN> list archivelog all;List of Archived Log CopiesKey    Thrd Seq S    Low Time   Name------- ---- ------- -      ---------         ------------- 59       1      35      A   16-MAY-11 /u01/backup/arch1/1_35_750725106.dbf60       1      35      A   16-MAY-11 /u01/backup/arch2/1_35_750725106.dbf61       1      36      A   16-MAY-11 /u01/backup/arch1/1_36_750725106.dbf62       1      36      A   16-MAY-11 /u01/backup/arch2/1_36_750725106.dbf现在手工在操作系统下用rm命令将36号归档日志文档删除，模拟36号归档日志丢失了，www.linuxidc.com那么在执行备份归档日志时将出现：RMAN> backup tablespace app plus archivelog delete all input;Starting backup at 16-MAY-11current log archivedusing channel ORA_DISK_1archived log /u01/backup/arch1/1_36_750725106.dbf not found or out of sync with catalogtrying alternate file for archivelog thread 1, sequence 36RMAN-00571: ===========================================================RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============RMAN-00571: ===========================================================RMAN-03002: failure of backup plus archivelog command at 05/16/2011 03:22:29RMAN-06059: expected archived log not found, lost of archived log compromises recoverabilityORA-19625: error identifying file /u01/backup/arch2/1_36_750725106.dbfORA-27037: unable to obtain file statusLinux Error: 2: No such file or directoryAdditional information: 3这就是因为缺少了36号归档日志的原因，那么现在怎么处理呢？解决办法：RMAN> crosscheck archivelog all;或者：RMAN> change archivelog all crosscheck;再次执行备份操作即可。然后需要在RMAN中进行清除操作：RMAN> list archivelog all;List of Archived Log Copies
Key     Thrd Seq     S Low Time Name
------- ---- ------- - --------- ----
62      1    36      X 16-MAY-11 /u01/backup/arch2/1_36_750725106.dbf
61      1    36      X 16-MAY-11 /u01/backup/arch1/1_36_750725106.dbfRMAN> delete archivelog 61,62;released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=141 devtype=DISKList of Archived Log Copies
Key     Thrd Seq     S Low Time Name
------- ---- ------- - --------- ----
61      1    36      X 16-MAY-11 /u01/backup/arch1/1_36_750725106.dbf
62      1    36      X 16-MAY-11 /u01/backup/arch2/1_36_750725106.dbfDo you really want to delete the above objects （enter YES or NO）？ y
deleted archive log
archive log filename=/u01/backup/arch1/1_36_750725106.dbf recid=61 stamp=751258131
deleted archive log
archive log filename=/u01/backup/arch2/1_36_750725106.dbf recid=62 stamp=751258131
Deleted 2 objectsOracle数据库表空间日常操作Oracle入门教程：如何kill掉RMAN备份进程相关资讯 Oracle数据库 Oracle入门教程 oracle数据库教程

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