Oracle-L: RE: log_checkpoint_interval - Any Critically High Value ?

From: Naveen Nahata <naveen_nahata_at_mindtree.com>
Date: Tue, 08 Oct 2002 05:03:37 -0800
Message-ID: <F001.004E3165.20021008050337@fatcity.com>

log_checkpoint_interval is specified in number of OS Blocks. Depending upon the size of ur OS Block it will force a checkpoint after that many number of bytes written in the redo buffers.

Normally it should be a divisor of the redo log size, means for 500MB it should be 1MB, 2MB, 5MB but not 7 MB because 500/7 doesn't give an integer value.

Setting it to more than the size of the redo-logs, gives no advantage, it will only ir-regularize the checkpoints.

Usually, increasing the checkpoint interval increases the performance by reducing the checkpoint frequency.

There is no upper limit, but I don't know what will happen if u set it to zero.

What was the exact performance problem that u faced?

Regards
Naveen

-----Original Message-----
Sent: Tuesday, October 08, 2002 4:09 PM
To: Multiple recipients of list ORACLE-L

Qs log_checkpoint_interval - Is there any Upper Limit to Setting it's Value on Oracle 8.1.7 ?

NOTE - On a Hybrid 150 GB Database (Oracle 7.3.4) on setting increasing it's Value from
4,70,000 to 10,00,000 we had faced a Huge performance problem & had Scaled it Down back
to 4,70,000

NOTE - Online Redo Logs were of Size 500 MB Each

Qs Does Setting log_checkpoint_timeout to 0 Disable the Same ?
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Author: Naveen Nahata
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