Hello,
You can use vacuum at different levels.
As a command you can use vacuumdb database_name.
In psql, you can use
psql> vacuum table_name;
I don't think it is going to delete records. To delete records you need to
issue SQL command:
like: delete from table_name where condi.
It must delete the cells. when you delete the reocrds, the space does not
get compressed.
You can check the size changes of a table or database before and after you
issue "vacuum" command.
You don't need to shut down postmoaster.
It would be nice if you do such jobs at midnight, because such a job does
keep your CPU busy.
Bangh
"Leong, Fushan" wrote:
> Hi :
>
> Want to get your opinion.
>
> I am thinking to schedule to run Vaccum everynight.
>
> 1) As I understand, Vaccum is the command to delete old data, right?
> 1) Do I have to stop the postmaster before run the Vaccum command?
> 2) Should I run it everynight? How often should I run it?
>
> thanks
> Fushan
>
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