| From: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Ants Aasma <ants(dot)aasma(at)eesti(dot)ee>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Kevin Grittner <kgrittn(at)postgresql(dot)org>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, "pgsql-committers(at)postgresql(dot)org" <pgsql-committers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold < |
| Date: | 2016-06-03 21:29:40 |
| Message-ID: | CACjxUsNu3yWMhTs9tKW_mmQBK5bcN4wzyy7jtwCOQpiySqoEww@mail.gmail.com |
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| Lists: | pgsql-committers pgsql-hackers |
On Fri, May 27, 2016 at 10:35 AM, Kevin Grittner <kgrittn(at)gmail(dot)com> wrote:
> On Tue, May 24, 2016 at 4:10 PM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>> [ANALYZE of index with expression may fail to update statistics
>> if ANALYZE runs longer than old_snapshot_threshold]
>> If we can get away with it, it would be a rather large win to only set
>> a snapshot when the table has an expression index. For purposes of
>> "snapshot too old", though, it will be important that a function in an
>> index which tries to read data from some other table which has been
>> pruned cancels itself when necessary.
>
> I will make this my top priority after resolving the question of whether
> there is an issue with CREATE INDEX. I expect to have a resolution,
> probably involving some patch, by 3 June.
Due to 9.5 bug-fixing and the index issue taking a bit longer than
I expected, this is now looking like a 7 June resolution.
--
Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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