Horton

Re: [PROPOSAL] Use SnapshotAny in get_actual_variable_range

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Dmitriy Sarafannikov <dsarafannikov@yandex.ru>
Cc: Amit Kapila <amit.kapila16@gmail.com>, Robert Haas <robertmhaas@gmail.com>, "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>, Borodin Vladimir <root@simply.name>, Хомик Кирилл <khomikki@yandex-team.ru>
Date: 2017-09-07T23:43:11Z
Lists: pgsql-hackers 
I wrote:
> Dmitriy Sarafannikov <dsarafannikov@yandex.ru> writes:
>> [ snapshot_non_vacuumable_v3.patch ]

> In short I think we should just set up the threshold as RecentGlobalXmin.

Pushed with that adjustment and some fooling with the comments.

			regards, tom lane

Commits

  1. Improve performance of get_actual_variable_range with recently-dead tuples.

  2. Use SnapshotDirty rather than an active snapshot to probe index endpoints.