| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Evgeny Gridasov <eugrid(at)fpm(dot)kubsu(dot)ru> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: WAL question |
| Date: | 2007-01-12 15:53:53 |
| Message-ID: | 20070112155353.GD27743@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Evgeny Gridasov wrote:
> Hello.
>
> So, what happens if I set checkpoint_segments and checkpoint_timeout very high,
> and, shared_buffers to a very low value?
> Will PostgreSQL force a checkpoint when it has not enough memory in shared_buffers for some new "un-checkpointed" data ?
It won't force a checkpoint -- it will release memory by causing
individual buffer evictions. (What checkpoint does is evicting all
buffers in one go, but backends can cause a buffer to be evicted if they
need it for something else).
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Magnus Hagander | 2007-01-12 16:06:09 | Re: [HACKERS] Checkpoint request failed on version 8.2.1. |
| Previous Message | Jeanna Geier | 2007-01-12 15:45:27 | Re: RESTORE Error |