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Re: Adding REPACK [concurrently]

Alvaro Herrera <alvherre@alvh.no-ip.org>

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From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: Mahendra Singh Thalor <mahi6run@gmail.com>
Cc: Robert Treat <rob@xzilla.net>, Matthias van de Meent <boekewurm+postgres@gmail.com>, Antonin Houska <ah@cybertec.at>, Mihail Nikalayeu <mihailnikalayeu@gmail.com>, Pg Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2026-03-16T19:26:49Z
Lists: pgsql-hackers 
On 2026-Mar-16, Mahendra Singh Thalor wrote:

> postgres=#* repack test1, test2;*
> ERROR:  syntax error at or near ","
> LINE 1: repack test1, test2;
>                     ^
> 
> I was not expecting any error but maybe I am missing something (some patch
> needs to be applied to test this query?).

Yeah, there's no support for repacking multiple tables in one command.
This is intentional.  I think it'd be not very hard to add.  But why?
People isn't likely to be running emergency VACUUM FULL on multiple
large tables in this way, listing multiple of them in a single command,
IMO anyway.  So I think we don't need it.

(I think this is not similar to the case where normal vacuum is being
run in an emergency for XID wraparound purposes, which the ability to
run on multiple tables is more valuable.  But at the same time, vacuumdb
does a much better job at that, since it can process multiple tables in
parallel.)

-- 
Álvaro Herrera               48°01'N 7°57'E  —  https://www.EnterpriseDB.com/

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Allow old WAL recycling during REPACK CONCURRENTLY

  2. Advance restart_lsn more eagerly in LogicalConfirmReceivedLocation

  3. Remove unnecessary signal handler change

  4. Improve REPACK (CONCURRENTLY) error messages some more

  5. Revert "Allow logical replication snapshots to be database-specific"

  6. Move REPACK (CONCURRENTLY) test out of stock regression tests

  7. REPACK: do not require REPLICATION or LOGIN

  8. Add missing initialization

  9. Simplify declaration of memcpy target

  10. Reserve replication slots specifically for REPACK

  11. doc: Add an example of REPACK (CONCURRENTLY)

  12. Allow logical replication snapshots to be database-specific

  13. Avoid different-size pointer-to-integer cast

  14. Fix valgrind failure

  15. Add CONCURRENTLY option to REPACK

  16. Rename cluster.c to repack.c (and corresponding .h)

  17. Allow index_create to suppress index_build progress reporting

  18. Make index_concurrently_create_copy more general

  19. Document the 'command' column of pg_stat_progress_repack

  20. Introduce the REPACK command

  21. Toggle logical decoding dynamically based on logical slot presence.

  22. Split vacuumdb to create vacuuming.c/h

  23. Remove ReorderBufferTupleBuf structure.

  24. Revert changes to CONCURRENTLY that "sped up" Xmin advance

  25. VACUUM: ignore indexing operations with CONCURRENTLY