Jump to content

RAC Attack - Oracle Cluster Database at Home/Flashback Database

Add links
From Wikibooks, open books for an open world


  2. Before opening the database, enable flashback database. SQL> alter database flashback on; Database altered. SQL> alter database open; Database altered. SQL> select flashback_on from v$database; FLASHBACK_ON ------------------ YES SQL> select oldest_flashback_scn,flashback_size from v$flashback_database_log; OLDEST_FLASHBACK_SCN FLASHBACK_SIZE -------------------- -------------- 610425 8192000
  3. Now, login to collabn2 and startup the database from sqlplus. You will get an error message. collabn2:/home/oracle[RAC2]$ ss SQL*Plus: Release 11.1.0.6.0 - Production on Mon May 4 09:21:25 2009 SQL> startup ORACLE instance started. Total System Global Area 318054400 bytes Fixed Size 1299624 bytes Variable Size 142609240 bytes Database Buffers 167772160 bytes Redo Buffers 6373376 bytes Database mounted. ORA-38760: This database instance failed to turn on flashback database SQL> select flashback_on from v$database; FLASHBACK_ON ------------------ YES SQL> select oldest_flashback_scn,flashback_size from v$flashback_database_log; OLDEST_FLASHBACK_SCN FLASHBACK_SIZE -------------------- -------------- 0 16384000
  4. Interestingly, the database seems to be running alright. Investigate the alert log for error messages. collabn2:/home/oracle[RAC2]$ cdd collabn2:/u01/app/oracle/diag[RAC2]$ cd rdbms/rac/RAC2/trace/ collabn2:/u01/app/oracle/diag/rdbms/rac/RAC2/trace[RAC2]$ less alert_RAC2.log Mon May 04 09:22:07 2009 Errors in file /u01/app/oracle/diag/rdbms/rac/RAC2/trace/RAC2_ora_22856.trc: ORA-38701: Flashback database log 1 seq 1 thread 1: "/u01/app/oradata/RAC/flashb ack/o1_mf_4zxxs99n_.flb" ORA-27037: unable to obtain file status Linux Error: 2: No such file or directory Additional information: 3
  5. Investigate the alert log on collabn1 – do any error messages appear here? Do any other problems occur?
  6. Disable flashback database. You do not need to shutdown for the disable operation. SQL> alter database flashback off; Database altered.


Retrieved from "https://en.wikibooks.org/w/index.php?title=RAC_Attack_-_Oracle_Cluster_Database_at_Home/Flashback_Database&oldid=2509024"