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RE: [Q] ORACLE 9i fast_start_mttr_target and log_checkpoint_inte

From: Gillian <zmkj04_at_yahoo.com>
Date: Tue, 19 Nov 2002 15:10:26 -0800
Message-ID: <F001.005075C2.20021119151026@fatcity.com>

ok - it so happens I am in the middle of the 9i New Features class. I just clarified that with the instuctor. And he repeated that if the log_checkpotint parameters are set, as well as the MTTR, then MTTR overides whatever the log_checkpoint parameters are set to. I did not check out the official documentation. But the class manual says, 'Internally this is translated to a setting for Log_checkpoint_interval' The instructor's name is Steve Bertuoi. Not sure how good he knows his stuff. I guess I could play around with their test database here in the class, and see what really happens. Gillian
 DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM> wrote:Gillian - But the documentation clearly says just the opposite. It says that if you set the LOG_CHECKPOINT_INTERVAL parameter, then that is what is used, rather than FAST_START_MTTR_TARGET. So I don't see how you can say that FAST_START_MTTR_TARGET overrides the LOG_CHECKPOINT_INTERVAL. Am I missing something here?

Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Tuesday, November 19, 2002 12:59 PM To: Multiple recipients of list ORACLE-L

Just to add:

The MTTR parameter overides the Log_checkpoint_interval and the ...timeout parameter. Oracle sets these log_checkpoint parameters dynamically when the MTTR parameter is set.

Gillian

DENNIS WILLIAMS wrote:

Dist -
Since nobody seems to have responded, I'll take a crack at it. The Oracle9i documentation specifically says (in the Oracle9i Database Reference) that either FAST_START_IO_TARGET or LOG_CHECKPOINT_INTERVAL will override FAST_START_MTTR_TARGET. I would tend to believe them. In the Oracle9i Performance Tuning Guide, Oracle contains a note that you should disable or remove the FAST_START_IO_TARGET, LOG_CHECKPOINT_INTERVAL, and LOG_CHECKPOINT_TIMEOUT parameters when using FAST_START_MTTR_TARGET. Setting these parameters interferes with FAST_START_MTTR_TARGET.
I don't see where LOG_CHECKPOINTS_TO_ALERT would cause a problem, but if you are suspicious, you might check metalink. As I understand it, the big advantage of FAST_START_MTTR_TARGET is its ease and accuracy. Your management provides a goal for how long your Oracle database can take to reco! ! ver in the situation where it crashes. You simply
convert that number to seconds and set FAST_START_MTTR_TARGET. With the LOG_CHECKPOINT parameters, the settings are derived more indirectly. Of course, there is no free lunch. Setting a shorter recovery time may interfere with performance.
Dennis Williams
DBA, 40%OCP
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Monday, November 18, 2002 11:04 AM To: Multiple recipients of list ORACLE-L log_checkpoint_interval parameter?

I saw a document mention if log_checkpoint_interval define on ORACLE 9i, the fast_start_mttr_target parameter will be ignore. My question is:

  1. we have following on init.ora file:
log_checkpoint_interval = 10000
log_checkpoint_timeout = 1800
log_checkpoints_to_alert = true

fast_start_mttr_target=300

Do I need remove all the log_checkpoint* on init.ora file?

2. what kind of ! ! benefit that fast_start_mttr_target better than log_checkpoint* ?

Thanks



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Author: Gillian
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