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Connor McDonald

Thanks for the question, Oskars.

Asked: January 11, 2024 - 8:12 am UTC

Last updated: January 15, 2024 - 5:00 am UTC

Version: 19.19

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You Asked

Hello, I have a question regarding log file switch (checkpoint incomplete) that is caused due to logfile switch while checkpoint is still in old one, question is - can this cause sessions to hang fully for the wait period or it should not be the case? The issue is caused due to improper setup of redolog groups being different size and too small in some.

and Chris said...

Yes, this can block sessions.

If the database can't write to the redo log, any changes could be lost => you can't recover them. So anything that needs to write to the redo log may be blocked by this event.

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Comments

A reader, January 12, 2024 - 2:21 pm UTC

Thank you!
Connor McDonald
January 15, 2024 - 5:00 am UTC

Just to add - check out this excellent post by Tanel

https://tanelpoder.com/posts/log-file-switch-checkpoint-incomplete-and-lgwr-waiting-for-checkpoint-progress/

log file waits are not necessarily due to the redo log subsystem
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