| From: | Jim Nasby <decibel(at)decibel(dot)org> |
|---|---|
| To: | Michael Fuhr <mike(at)fuhr(dot)org> |
| Cc: | Shyam Sunder Rai <ssrai(at)ismartpanache(dot)com>, pgsql-admin(at)postgresql(dot)org |
| Subject: | Re: Table size |
| Date: | 2007-06-18 22:18:54 |
| Message-ID: | F8EF74FD-0F4E-4D26-A80F-844CB5A67A0A@decibel.org |
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| Lists: | pgsql-admin |
On Jun 14, 2007, at 8:16 AM, Michael Fuhr wrote:
> On Thu, Jun 14, 2007 at 06:10:15PM +0530, Shyam Sunder Rai wrote:
>> How can I calculate a table size in postgres ?
>
> To find the size of an existing table use pg_relation_size() or
> pg_total_relation_size() (8.1 and later; in earlier versions use
> the functions in contrib/dbsize).
If you don't need an exact size, you can also look at
pg_class.relpages, which is the size of a relation in pages. The
relation_size functions actually read the size off the filesystem,
which seems to be quite a bit slower if you're dealing with more than
a few files.
--
Jim Nasby jim(at)nasby(dot)net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
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