BAAS: Battle Against Archiver Stuck – ALTERNATE Archive Location

If you are managing volatile systems, you might have encountered Archiver-Stuck in the past.

0RA-00257:archiver error, connect internal only until freed
ORA-16014:log 2 sequence# 1789 not archived, no available destinations

If this is the case, you might be interested in a rarely used feature called “ALTERNATE Archive Locations”. This is a second independent archive log destination, that is only used in case the primary destination is failing (full). In that case, the dest_2 is automatically enabled, preventing stuck database. As soon as the archivelog backup has cleaned up the full DEST_1 destination, there is an AUTOMATIC FALLBACK to the DEST_1 destination.

ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=/disk1 MANDATORY MAX_FAILURE=1 ALTERNATE=LOG_ARCHIVE_DEST_2';
ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_1=ENABLE;
ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2=ALTERNATE;
ALTER SYSTEM SET LOG_ARCHIVE_DEST_2='LOCATION=/disk2 MANDATORY ALTERNATE=LOG_ARCHIVE_DEST_1';

Testing:

Thread 1 advanced to log sequence 174 (LGWR switch)
  Current log# 3 seq# 174 mem# 0: /u01/app/oracle/oradata/CDB122/redo03.log
2018-04-27T17:18:47.685736+02:00
ARC3: Encountered disk I/O error 19502
2018-04-27T17:18:47.685800+02:00
ARC3: Closing local archive destination LOG_ARCHIVE_DEST_1 '/disk1/1_173_971869447.dbf' (error 19502) (CDB122)
2018-04-27T17:18:47.687074+02:00
Errors in file /u01/app/oracle/diag/rdbms/cdb122/CDB122/trace/CDB122_arc3_31260.trc:
ORA-27072: File I/O error
Additional information: 4
Additional information: 65536
Additional information: 315392
ORA-19502: write error on file "/disk1/1_173_971869447.dbf", block number 65536 (block size=512)
2018-04-27T17:18:47.816938+02:00
Errors in file /u01/app/oracle/diag/rdbms/cdb122/CDB122/trace/CDB122_arc3_31260.trc:
ORA-19502: write error on file "/disk1/1_173_971869447.dbf", block number 65536 (block size=512)
ORA-27072: File I/O error
Additional information: 4
Additional information: 65536
Additional information: 315392
ORA-19502: write error on file "/disk1/1_173_971869447.dbf", block number 65536 (block size=512)
ARC3: I/O error 19502 archiving log 2 to '/disk1/1_173_971869447.dbf'

After the error, archivelogs are placed in /dir2 directory and as soon as space is available again, archive destination is switched back to /dir1 automatically.

Archiver Stuck never again, right?

关注dbDao.com的新浪微博

扫码加入微信Oracle小密圈,了解Oracle最新技术下载分享资源

TEL/電話+86 13764045638
Email service@parnassusdata.com
QQ 47079569