Re: postmaster hangs on delete from

On Friday 13 March 2009, emsa@devdep.com wrote:
> Hi,
>
> I have a serious issue with delete from.
>
> When I do something like:
>
> "delete from CALC_INVOICE_DATA where PERIOD_END>='2011-01-01'"
>
> the postmaster takes 100% CPU and then nothing happens.
>

Some possibilities:

1) If it's using 100% CPU for a long period of time, you might have a
foreign key relationship to this table, and the key in the other (largish,
but not larger than RAM) table is not indexed, which is resulting in a seq
scan in cache for every row being deleted.

2) You have another on delete trigger that is expensive to run.

3) Some other backend is really using the 100% CPU and your delete is just
waiting for a lock on the table and not doing anything.

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