[20160202]crosscheck archivelog all.txt

[20160202]crosscheck archivelog all.txt

--当使用crosscheck archivelog all检查时注意一个细节，通过例子来说明：

1.环境：

SCOTT@book> @ &r/ver1

PORT_STRING                    VERSION        BANNER

------------------------------ -------------- --------------------------------------------------------------------------------

x86_64/Linux 2.4.xx            11.2.0.4.0     Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production

RMAN> list archivelog all;

List of Archived Log Copies for database with db_unique_name BOOK

=====================================================================

Key     Thrd Seq     S Low Time

------- ---- ------- - -------------------

294     1    309     A 2016-02-01 05:00:22

        Name: /u01/app/oracle/archivelog/book/1_309_896605872.dbf

295     1    310     A 2016-02-01 22:00:15

        Name: /u01/app/oracle/archivelog/book/1_310_896605872.dbf

$ cd /u01/app/oracle/archivelog/book/

$ ll

total 89164

-rw-r----- 1 oracle oinstall 44703744 2016-02-01 22:00:16 1_309_896605872.dbf

-rw-r----- 1 oracle oinstall 46494208 2016-02-01 22:13:55 1_310_896605872.dbf

--仅仅存在2个备份，改名1个archive log：

$ mv 1_309_896605872.dbf 1_309_896605872.dbf_xxx

2.测试：

--备份archive log:

RMAN> backup archivelog all  format '/home/oracle/backup/archive_%u' ;

Starting backup at 2016-02-02 15:37:53

current log archived

using channel ORA_DISK_1

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-03002: failure of backup command at 02/02/2016 15:37:54

RMAN-06059: expected archived log not found, loss of archived log compromises recoverability

ORA-19625: error identifying file /u01/app/oracle/archivelog/book/1_309_896605872.dbf

ORA-27037: unable to obtain file status

Linux-x86_64 Error: 2: No such file or directory

Additional information: 3

RMAN> crosscheck archivelog all ;

released channel: ORA_DISK_1

allocated channel: ORA_DISK_1

channel ORA_DISK_1: SID=123 device type=DISK

validation failed for archived log

archived log file name=/u01/app/oracle/archivelog/book/1_309_896605872.dbf RECID=294 STAMP=902700016

validation succeeded for archived log

archived log file name=/u01/app/oracle/archivelog/book/1_310_896605872.dbf RECID=295 STAMP=902700835

archived log file name=/u01/app/oracle/archivelog/book/1_311_896605872.dbf RECID=296 STAMP=902763474

Crosschecked 3 objects

--可以发现校验/u01/app/oracle/archivelog/book/1_309_896605872.dbf RECID=294失败。而这个时候接着执行：

Starting backup at 2016-02-02 15:39:48

channel ORA_DISK_1: starting archived log backup set

channel ORA_DISK_1: specifying archived log(s) in backup set

input archived log thread=1 sequence=310 RECID=295 STAMP=902700835

input archived log thread=1 sequence=311 RECID=296 STAMP=902763474

input archived log thread=1 sequence=312 RECID=297 STAMP=902763588

channel ORA_DISK_1: starting piece 1 at 2016-02-02 15:39:49

channel ORA_DISK_1: finished piece 1 at 2016-02-02 15:39:50

piece handle=/home/oracle/backup/archive_25qsu525 tag=TAG20160202T153948 comment=NONE

channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01

Finished backup at 2016-02-02 15:39:50

--可以发现这个时候备份成功，但是漏掉了1_309_896605872.dbf.也就是讲当做了crosscheck archivelog all 后，已经表示那些文件不存在，这样才解决

--问题前已经漏掉了一些备份。

3.改名回来:

$ mv 1_309_896605872.dbf_xxx 1_309_896605872.dbf

294     1    309     X 2016-02-01 05:00:22

296     1    311     A 2016-02-01 22:13:55

        Name: /u01/app/oracle/archivelog/book/1_311_896605872.dbf

297     1    312     A 2016-02-02 15:37:53

        Name: /u01/app/oracle/archivelog/book/1_312_896605872.dbf

--注意： S=X.

archived log file name=/u01/app/oracle/archivelog/book/1_312_896605872.dbf RECID=297 STAMP=902763588

Crosschecked 4 objects

--这样才恢复正常。