Hemant Shah wrote:
>
>
> --- On Fri, 3/20/09, Jesper Krogh <jesper AT krogh DOT cc> wrote:
>
>
>> From: Jesper Krogh <jesper AT krogh DOT cc>
>> Subject: Re: [Bacula-users] Better way to garbage collect postgresql database
>> To: hjrrs AT yahoo DOT com
>> Cc: "baculausers" <bacula-users AT lists.sourceforge DOT net>
>> Date: Friday, March 20, 2009, 12:30 AM
>> Hemant Shah wrote:
>>
>>> This is a database question, but I figured some of the
>>>
>> bacula users may have
>>
>>> come across this problem so I am posting it here.
>>>
>>> Every monday I run following commands to check and
>>>
>> garbage collect bacula database:
>>
>>> dbcheck command
>>> vacuumdb -q -d bacula -z -f
>>>
>> There is absolutely no reason to "vacumm full"
>> unless your data-size actually are shrinking over time.
>> (longer periods). A normal vacuum will make it available for
>> the next run.. you most likely are running autovacuum
>> anyway.
>>
>
> Yes, I do run autovacuum, but I just start using postgresql and I am not
> sure how efficient it is in space usage. I was afraid that the data would be
> fragmented if it re-uses the free space.
>
The opposite is true, actually. When there is no free space left in the
database, postgres has no choice but to append new data at the end,
regardless of where the remaining table data is stored. When you let
postgres manage the free space, it can pick the space most appropriate
for storing any particular piece of data, and minimize fragmentation.
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