Re: pg_subtrans keeps bloating up in the standby

On Sat, Aug 28, 2010 at 2:08 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Fujii Masao <masao.fujii@gmail.com> writes:
>> On Fri, Aug 27, 2010 at 11:25 PM, Heikki Linnakangas
>> <heikki.linnakangas@enterprisedb.com> wrote:
>>> Hmm, agreed, seems like an oversight in hot standby. Before that, we didn't
>>> update pg_subtrans during recovery, so there was no point truncating it. But
>>> in hot standby, we do update it, so we need to truncate it too.
>
>> Yes. The attached patch changes a restartpoint so that it truncates pg_subtrans
>> when hot standby is enabled.
>
> Has StartupSUBTRANS been done?

Yes. StartupXLOG calls that before bgwriter is invoked. That is, we can
ensure that StartupSUBTRANS has always been done before bgwriter
performs a restartpoint.

Regards,

-- 
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center