Re: Statistics Import and Export

From: Corey Huinker <corey(dot)huinker(at)gmail(dot)com>
To: Jeff Davis <pgsql(at)j-davis(dot)com>
Cc: Michael Paquier <michael(at)paquier(dot)xyz>, jian he <jian(dot)universality(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Stephen Frost <sfrost(at)snowman(dot)net>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, alvherre(at)alvh(dot)no-ip(dot)org
Subject: Re: Statistics Import and Export
Date: 2025-02-11 19:02:21
Message-ID: CADkLM=cALMHZkXU+xZw9-WeR4XSXzDYj_-xERHg8haYq1zbjhg@mail.gmail.com
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>
>
>
> Comments on v45-0002:
>

Assuming you meant 47

>
> * Why is generate_old_dump() passing optionally passing --no-statistics
> to pg_dumpall along with --globals-only? If --globals-only is
> specified, no stats are dumped anyway, right?
>

Removed.

>
> * The tag is still wrong: it is "STATISTICS DATA mytable" when it
> should just be "mytable".
>

Fixed.

>
> * What's the logic behind the pg_dumpall options? The docs say
> it should support the new pg_dump options, but they don't seem to work.
>

Fixed.

>
> * The enum entryType casing is unconventional. How about a type name of
> TocEntryType and values like STATS_TOC_ENTRY.
>

Conventionified.

>
> * The pg_dump test suite time has increased by ~50%. If some tests are
> superfluous, please remove them.

The nature of the TAP tests is that every new check N must be run against
every existing dump run M adding one N check gets you M scans, and adding a
dump type requires that it be scanned N times, and we increased both N and
M. If there were a way to only do stats-related tests against a subset of
the dumps, then yes, we could trim it down, but as it is I think it's a
limitation of the testing structure. But aside from creating a whole extra
XYZ_pg_dump.pl file, I don't think there's a way to do that.

The previous 0001 is now committed (thanks!) so only one remains.

Attachment Content-Type Size
v48-0001-Enable-dumping-of-table-index-stats-in-pg_dump.patch text/x-patch 70.9 KB

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