Re: [HACKERS] [Proposal] Allow users to specify multiple tables inVACUUM commands

On Tue, Sep 5, 2017 at 10:16 AM, Michael Paquier
<michael.paquier@gmail.com> wrote:
> On Mon, Sep 4, 2017 at 11:47 PM, Bossart, Nathan <bossartn@amazon.com> wrote:
>> I've made this change in v14 of the main patch.
>>
>> In case others had opinions regarding the de-duplication patch, I've
>> attached that again as well.
>
> +   /*
> +    * Create the relation list in a long-lived memory context so that it
> +    * survives transaction boundaries.
> +    */
> +   old_cxt = MemoryContextSwitchTo(AutovacMemCxt);
> +   rangevar = makeRangeVar(tab->at_nspname, tab->at_relname, -1);
> +   rel = makeVacuumRelation(rangevar, NIL, tab->at_relid);
> +   rel_list = list_make1(rel);
> +   MemoryContextSwitchTo(old_cxt);
> That's way better, thanks for the new patch.
>
> So vacuum_multiple_tables_v14.patch is good for a committer in my
> opinion.

In get_rel_oids() we often switch the memory context to vac_context
and switch back. As a result almost code in get_rel_oids() is working
in vac_context. Maybe we can switch memory context before and after
the calling get_rel_oids?

Regards,

--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center