[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-00571: ===========================================================
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
validation succeeded for archived log
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：
RMAN> backup archivelog all format '/home/oracle/backup/archive_%u' ;
Starting backup at 2016-02-02 15:39:48
current log archived
using channel ORA_DISK_1
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
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 X 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
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.
RMAN> crosscheck archivelog all ;
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=123 device type=DISK
validation succeeded 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
validation succeeded for archived log
archived log file name=/u01/app/oracle/archivelog/book/1_311_896605872.dbf RECID=296 STAMP=902763474
validation succeeded for archived log
archived log file name=/u01/app/oracle/archivelog/book/1_312_896605872.dbf RECID=297 STAMP=902763588
Crosschecked 4 objects
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
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
--这样才恢复正常。