Re: ]To estimate the size of db

Hi, Gerd

> perhaps you can go the way via some system functions like:

Thank you very much and it's very helpful.

Regards
Duan

> ## list tables and their size
> SELECT    relname AS table_name,
>                  pg_size_pretty(pg_relation_size(oid)) AS table_sz,
>                  pg_size_pretty(pg_total_relation_size(oid)) AS
> total_sz
>        FROM      pg_class
>        WHERE     relkind = 'r'
>        ORDER BY  pg_relation_size(oid) DESC;
>
> ## list db's and size
> SELECT   datname AS db_name,
>                 pg_size_pretty(pg_database_size(oid)) AS db_size
>        FROM     pg_database
>        ORDER BY pg_database_size(oid) DESC;
>
>
> hope that helps......::GERD::......
>
> Am 22.05.2008 um 03:08 schrieb Duan Ligong:
>
>> Hi, Scott
>>
>> Thanks for your reply.
>>
>>> There's also the old fashioned way:
>>
>> I mean I want to estimate the size of the space which the db will
>> occupy.
>> Now there is no db.
>>
>>> sudo su - postgres
>>> cd $PGDATA  # or wherever you point with -D on startup
>>> du -sh .
>>
>> Regards
>> Duan
>> --
>> Duan Ligong
>> TEL   :  0561-75-1925-6201
>>           800-81-569-6201
>> E-Mail : l-duan@zd.cnes.jp.nec.com
>> ----- Original Message ----- From: "Scott Marlowe"
>> <scott.marlowe@gmail.com>
>> To: "Duan Ligong" <l-duan@zd.cnes.jp.nec.com>
>> Cc: <pgsql-admin@postgresql.org>
>> Sent: Thursday, May 22, 2008 4:08 AM
>> Subject: Re: [ADMIN] [Admin]To estimate the size of db
>>
>>
>>> On Wed, May 14, 2008 at 7:33 PM, Duan Ligong <l-
>>> duan@zd.cnes.jp.nec.com> wrote:
>>>>
>>>> Hi, all
>>>>
>>>> Is there a way to estimate the size of the space which a
>>>> postgresql database
>>>> occupies? or the max size of db?
>>>>
>>>> I know there are a lot of factors, such as the frequency
>>>> of updating, data size, which affects the size of db and it seems
>>>> difficult
>>>> to estimate it precisely.
>>>
>>> There's also the old fashioned way:
>>>
>>> sudo su - postgres
>>> cd $PGDATA  # or wherever you point with -D on startup
>>> du -sh .
>>>
>>> --
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>>
>>
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