Re: 10.1: hash index size exploding on vacuum full analyze

On Thu, Nov 16, 2017 at 10:32 AM, AP <pgsql(at)inml(dot)weebeastie(dot)net> wrote:
> On Thu, Nov 16, 2017 at 09:48:13AM +0530, Amit Kapila wrote:
>> Sounds quite strange. I think during vacuum it leads to more number
>> of splits than when the original data was loaded. By any chance do
>> you have a copy of both the indexes (before vacuum full and after
>> vacuum full)? Can you once check and share the output of
>> pgstattuple-->pgstathashindex() and pageinspect->hash_metapage_info()?
>> I wanted to confirm if the bloat is due to additional splits.
>
> For the latter is this correct?
>
> select * from hash_metapage_info(get_raw_page('exploding_index', 0))\gx
>

I think it should work, but please refer documentation [1] for exact usage.

[1] - https://www.postgresql.org/docs/devel/static/pageinspect.html#idm191242

--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com