Thu Apr 19 22:01:36 2012
Thread 1 cannot allocate new log, sequence 2031
Private strand flush not complete
  Current log# 1 seq# 2030 mem# 0: /u01/app/oracle/oradata/orcl/redo01.log
Thread 1 advanced to log sequence 2031
  Current log# 2 seq# 2031 mem# 0: /u01/app/oracle/oradata/orcl/redo02.log
Thu Apr 19 22:01:37 2012
Errors in file /u01/app/oracle/admin/orcl/bdump/orcl_lns1_7012.trc:
ORA-00270: error creating archive log 
Thu Apr 19 22:01:37 2012
LGWR: Error 270 closing archivelog file 'standby'
Thu Apr 19 22:01:44 2012
Thread 1 cannot allocate new log, sequence 2032
Private strand flush not complete
  Current log# 2 seq# 2031 mem# 0: /u01/app/oracle/oradata/orcl/redo02.log
Thread 1 advanced to log sequence 2032
  Current log# 3 seq# 2032 mem# 0: /u01/app/oracle/oradata/orcl/redo03.log

trace文件内容如

*** 2012-04-19 20:51:47.096 57126 kcrr.c
LNS1: initialized successfully ASYNC=1
Destination is specified with ASYNC=61440
*** 2012-04-19 20:51:48.125 70905 kcrr.c
Sending online log thread 1 seq 2025 [logfile 2] to standby
Opening logfile [logno 2]
LGWR: Archivelog for thread 1 sequence 2025 will NOT be compressed
Redo shipping client performing standby login
*** 2012-04-19 20:51:48.174 64561 kcrr.c
Logged on to standby successfully
Client logon and security negotiation successful!
Destination LOG_ARCHIVE_DEST_2 is in MAXIMUM PERFORMANCE mode
Archiving to destination standby ASYNC blocks=20480
Allocate ASYNC blocks: Previous blocks=0 New blocks=20480
Log file opened [logno 2]
*** 2012-04-19 20:52:03.210
*** 2012-04-19 20:52:03.210 71706 kcrr.c
Detected proper completion of online log
*** 2012-04-19 20:52:03.210 71549 kcrr.c
Detected physical end of file
Online entry still exists for log 2 thr 1 seq 2025. Using it
Closing thread 1 sequence 2025 logno 2 nab 2 los 65825433 nxs 65825440
*** 2012-04-19 20:52:03.219 70905 kcrr.c
Sending online log thread 1 seq 2026 [logfile 3] to standby
Opening logfile [logno 3]
LGWR: Archivelog for thread 1 sequence 2026 will NOT be compressed
Destination LOG_ARCHIVE_DEST_2 is in MAXIMUM PERFORMANCE mode
Archiving to destination standby ASYNC blocks=20480
Log file opened [logno 3]
Attempting to send buffer 0x0x2aad8decb000  start block 2  block count 1
    total size to send 512  blocksize 512
*** 2012-04-19 20:52:11.234 71706 kcrr.c
Detected proper completion of online log
*** 2012-04-19 20:52:11.234 71549 kcrr.c
Detected physical end of file
Attempting to send buffer 0x0x2aad8decb000  start block 3  block count 1
    total size to send 512  blocksize 512
Online entry still exists for log 3 thr 1 seq 2026. Using it
Closing thread 1 sequence 2026 logno 3 nab 4 los 65825440 nxs 65825443

执行如下命令问题解决

SQL> select group# from v$log;

    GROUP#
----------
         1
         3
         2

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;

Database altered.

SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1;

Database altered.

SQL> ALTER DATABASE CLEAR LOGFILE GROUP 2;    

Database altered.

SQL> ALTER DATABASE CLEAR LOGFILE GROUP 3;

Database altered.

SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;

Database altered.

当查询v$datafile scn,database scn,datafile_header.scn发现均不一致,这个时候不能使用CURRENT_SCN来作为scn增量备份的起点，这个时候需要根据缺少日志最下sequence#找出scn,然后作为增量备份的起点.

找出scn起点

SQL> select FIRST_CHANGE#  from v$archived_log where SEQUENCE#  =2017;

 FIRST_CHANGE# 
 ------------- 
      65727543  

所以使用gap中提示的sequence#找出起始scn比CURRENT_SCN 更加靠谱(出现scn不一致情况,一般人工不正常干预dg导致

BACKUP INCREMENTAL FROM SCN 65727543 DATABASE
FORMAT '/home/oracle/xff_%U' tag 'XIFENFEI';