This occurs as at least one of the Oracle processes (LGWR, others?) still has the redo log open. You can rm it and it will 'disappear' from the file list, but as it is still open by LGWR. so when the log buffer is flushed and written by LGWR, it is written to the file that LGWR still has open. Once you shutdown the instance, LGWR terminates and lets go of the file, which is then 'officially' rmed. When the instance is restarted, the process(es) attempt to open the file, but cannot as it has been deleted.
-- Daniel Fink Oracle Performance, Diagnosis and Training OptimalDBA http://www.optimaldba.com Oracle Blog http://optimaldba.blogspot.com Join me at Miracle Scotland DB Forum! http://www.miracleltd.com/index.asp?page=167&page2=343 DBA Deepak wrote:
Hi All,As we know when we issue a COMMIT the log buffer content is flushed to the online redo log file before the "Commit complete" status is returned to the user. Please correct me if I am wrong.I have the following scenario... SQL> select member from v$logfile; MEMBER--------------------------------------------------------------------------------/u04/oradata/BIDWDB01/redo03.log /u04/oradata/BIDWDB01/redo02.log /u04/oradata/BIDWDB01/redo01.log SQL> !rm /u04/oradata/BIDWDB01/redo01.log SQL> !rm /u04/oradata/BIDWDB01/redo02.log SQL> !rm /u04/oradata/BIDWDB01/redo03.log SQL> connect scott/oracle Connected. SQL> update emp set ename=ename; 14 rows updated. SQL> commit; Commit complete. SQL> commit; Commit complete. SQL> conn / as sysdba Connected. SQL> shutdown immediate Database closed. Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. Total System Global Area 4479516672 bytes Fixed Size 1984504 bytes Variable Size 905975816 bytes Database Buffers 3556769792 bytes Redo Buffers 14786560 bytes Database mounted. ORA-00313: open failed for members of log group 1 of thread 1 ORA-00312: online log 1 thread 1: '/u04/oradata/BIDWDB01/redo01.log' -----------------------My question is even after deleting all the online redo log files how did Oracle returned the Commit complete status to the user? What happened to the log buffer data flush?I am using 10.2.0.2 <http://10.2.0.2> on Solaris 9 (64-bit) Regards,Deepak
