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Home -> Community -> Mailing Lists -> Oracle-L -> RE: lost datafile and checkpoing
Gene
Checkpointing in earlier versions of Oracle was a performance bottleneck, so Oracle has been working harder to make a smaller performance impact. My Oracle class notes lists several types of checkpoints in 9i: Incremental Checkpoint - Like at a log switch or the 3-sec. interval. Note: this checkpoint does NOT force a write of any data to the data files. Full Checkpoint - further subdivided into Complete Checkpoint and Tablespace Checkpoint (ALTER TABLESPACE XXX BEGIN BACKUP). The complete checkpoint writes modified buffers to the data files, then checkpoint information is written to the control file and data file headers. Performed during normal shutdown or manually by ALTER SYSTEM CHECKPOINT.
You don't say how you induced a checkpoint. Try issuing ALTER SYSTEM CHECKPOINT and report the results back to us.
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Thursday, May 08, 2003 3:57 PM
To: Multiple recipients of list ORACLE-L
Hi all:
I have been testing backups against Oracle9 db. I have renamed a datafile from file.dbf to file.dbf2. Then I ran a checkpoint expecting it to fail, but it didn't. I have done that several time without getting any warning from checkpoint. I though that checkpoint should 'touch" all the datafile and notice that one of them is missing. am I wrong?
thanks
Gene
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services ---------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Thu May 08 2003 - 16:37:27 CDT
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