RE: BUG #17518: Getting Error "new multixact has more than one updating member" when trying to delete records.

Hi David,

Thanks for the response.

* I haven’t tried via psql. I only have a snapshot of the customer’s database that I can restore in RDS. It is very time consuming to set this up. I’ve corrected the problem by running VACUUM (FULL, FREEZE, VERBOSE, ANALYZE, INDEX_CLEANUP, TRUNCATE) on the table and the problem is resolved.
* Deleting by date where it only matches to 1 row seems to work. If I match on more than one, it seems to fail. I’m not sure what conditions make it happen. I have not tried to delete by PK. I’m not sure what you mean by “How about columns?”. You don’t specify columns on a delete statement.
* Can I construct a self-contained minimal reproducer?: No unfortunately exporting the table and importing it to another Postgres instance does not reproduce the issue. Again the vacuum above corrects the issue.
* Does it manifiest standalone…? Again I only have the snapshot to restore on RDS and can reproduce it that way.

Again, the issue is resolved. Thanks for your attention to this!

Bob

Bob
Krier
Cleo |
Principal Software Engineer II
Tel: 815-986-6759
Email: rkrier(at)cleo(dot)com
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From: David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>
Sent: Saturday, June 25, 2022 4:52 PM
To: Krier, Bob <rkrier(at)cleo(dot)com>; PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: BUG #17518: Getting Error "new multixact has more than one updating member" when trying to delete records.

On Tue, Jun 14, 2022 at 9:03 AM PG Bug reporting form <noreply(at)postgresql(dot)org<mailto:noreply(at)postgresql(dot)org>> wrote:
The following bug has been logged on the website:

Bug reference: 17518
Logged by: Bob Krier
Email address: rkrier(at)cleo(dot)com<mailto:rkrier(at)cleo(dot)com>
PostgreSQL version: 12.10
Operating system: AWS RDS
Description:

We are getting an error executing a delete statement from JDBC like
follows:

DELETE FROM "EBI"."LOG_OF_CONNECTION" WHERE "DATE" < {some java date in
milliseconds}. The error is as follows:
---> "SQLException: ERROR: new multixact has more than one updating
member"

If you try this via psql you don't see the error though?

Do you get the same error if you delete a single row using a PK instead of a bunch of rows via a date inequality?

Does it seem to matter which rows are being deleted in general, or how many? How about columns?

Can you construct a self-contained minimal reproducer?

Does it manifest on standalone community PostgreSQL or just RDS?

David J.