| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Magnus Hagander <magnus(at)hagander(dot)net> |
| Cc: | Bill Glennon <wglennon(at)gmail(dot)com>, pgsql-general General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: PostgreSQL database segsize |
| Date: | 2020-06-29 22:59:54 |
| Message-ID: | 437472.1593471594@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Magnus Hagander <magnus(at)hagander(dot)net> writes:
> On Tue, Jun 30, 2020 at 12:17 AM Bill Glennon <wglennon(at)gmail(dot)com> wrote:
>> If you are building a Postgresql database from source and you use
>> option --with-segsize=4, how do you verify that the database segsize is 4GB
>> and not the default 1GB? Is there a query that you can run?
> You can run the query "SHOW segment_size" to show the compiled-in value.
pg_controldata will show it too, though a bit more opaquely:
Blocks per segment of large relation: 131072
This would be helpful if you have an on-disk database and no running
server.
regards, tom lane
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