| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Keaton Adams <kadams(at)mxlogic(dot)com> |
| Cc: | pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: WAL file utilization question |
| Date: | 2007-05-16 16:35:20 |
| Message-ID: | 20070516163520.GZ4582@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-admin |
Keaton Adams wrote:
> Even with full_page_writes set to false and checkpoints taking place
> every 60 seconds or so, the amount of WAL log data generated per minute
> seems to be significant.
Stop right there. Having checkpoints every 60 seconds is insane. Did
you look into increasing checkpoint_segments a lot?
> So my question is this: If I kick off a transaction that loads records
> with a size of 100 bytes, does the insert for that record take 100 bytes
> in the WAL file, or is the data archived in the WAL log in page size
> (8k) portions?
Vicinity of 100 bytes, except right after checkpoints as you noted.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Keaton Adams | 2007-05-16 16:49:04 | Re: WAL file utilization question |
| Previous Message | Jim C. Nasby | 2007-05-16 16:35:13 | Re: WAL file utilization question |