Trying to archive more often: archive_lag_target vs downsizing redo logs

Hi,
I have a small production 10.2.0.1 database (small: all the files are 17GB total) on Linux which is used in Agile PLM. Ever since we went live, it produces only 2-4 archive logs per day. This was OK when our company was only concerned with being able to restore from the nightly cold backup. Now we want to make sure we can recover to the last hour of work. So I need the database to spit out more logs. It has 4 log groups (with 2 members each), each 50M in size. I am going to add 2 more log groups to have 6, since that is what we did for our 11i instance based on a consultants recommendation. That could prevent some problems, but won't cause it to spit out more logs. I did some research (here included) and found that setting archive_lag_target-3600 will FORCE the db to spit out logs every hour, and doing some testing, this works very nicely. The archive logs are only about 1.2M when they do get spit out every hour, but that is fine. The question is, is it OK to turn on archive_lag_target while keeping the size of the logs at 50M, and have mostly "small" logs being spit out? Or should I reduce the size of the logs to say 20M (by dropping the old ones and creating new ones)? I actually tried 20M and then during a busy time it spit out 2 of them within 10 minutes, but then I looked and saw it did the same thing with the 50M size, so I figured why not keep the 50M redo log size in the first place? It would actually make my go-live plan easier as I would just add 2 log groups at the current size in prod, and not have to drop and recreate a bunch of logs. I think this is a good plan -- my only worry is that if traditionally the way to increase the frequency of the logs was to reduce their size, I feel like I am "cheating" by using the archive_lag_target parameter to do this. I also want to not change too many things at once in production at one time. Thanks in advance. Marv

user11965205 wrote:
is, is it OK to turn on archive_lag_target while keeping the size of the logs at 50M, and have mostly "small" logs being spit out?Yes it is OK: you should keep "large" redo log in case your database instance has sometimes much more write activity to avoid checkpoint not complete issue.

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If you have a cold backup (database shutdown properly) without the redo logs, change this :
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CREATE CONTROLFILE REUSE DATABASE "XE" RESETLOGS NOARCHIVELOGYou have to change the NORESETLOGS to RESETLOGS for Oracle to recreate the online redo logs.
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Trying to archive more often: archive_lag_target vs downsizing redo logs

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