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Home -> Community -> Mailing Lists -> Oracle-L -> RE: [Q] ORACLE 9i fast_start_mttr_target and log_checkpoint_inte
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:
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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