Re: Size for vacuum_mem

Can someone please explain the relatiionship between operation of a
vacuum-ing job
and vacuum_mem setting in non-shared memfory configuration.

Ie from a capacity planning point of view, how is vacuum_mem's size is
related to this
operation. The current 8k default seems so low...

Thanks

Shridhar Daithankar wrote:

>On 4 Dec 2002 at 19:38, Neil Conway wrote:
>
>
>
>>>Currently a vacuum full takes 3+ hours and very soon the amount of data
>>>will increase.
>>>
>>>
>>Do you need to use VACUUM FULL?
>>
>>
>
>Let me elaborate this statement.
>
>1) You need vacuum full only to recover space from deleted tuples. Unless the
>database has undergone major deletion somewhere 'vacuum full' might be a cannon
>to kill an ant.
>
>2) You should consider vacuuming tablewise. Vacuum is useful only for those
>tables which change at a faster rate. A lookup or archive table might not need
>vacuum. Just vacuum the tables which are heavily updated/deleted/inserted. And
>by heavily, I mean heavily in terms of tuples. Inserting a single 200MB BLOB
>and vacuuming the table might not yield any performance improvement..
>
> HTH
>
>Bye
> Shridhar
>
>--
>blithwapping: Using anything BUT a hammer to hammer a nail into the wall, such
>as shoes, lamp bases, doorstops, etc. -- "Sniglets", Rich Hall & Friends
>
>
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