Re: could not access status of transaction pg_multixact issue

Alvaro Herrera-9 wrote
> jim_yates wrote:
>
>> > A better way not involving mxid_age() would be to use pg_controldata to
>> > extract the current value of the mxid counter, then subtract the
>> current
>> > relminmxid from that value.
>>
>>
>> It's not clear which lines from pg_controldata to use for updating
>> pg_database.datminmxid.
>
> The one labelled NextMultiXactId.
>
>> I also assume I would do the pg_database update on a idle database.
>
> It doesn't matter, actually. pg_database is a shared catalog, so an
> update would affect all the databases.
>
> --
> Álvaro Herrera http://www.2ndQuadrant.com/
> PostgreSQL Development, 24x7 Support, Training & Services

I tried doing the update to pg_database on my Dev server and I can't get it
to work. How do I calculate the new datminmxid value?

NextMultiXactId: 30349 relminmxid from pg_class for the table: 8376

If I subtract the relminmxid from the nextmulixact I get 21793 which won't
work.

production-copy=# update pg_database set datminmxid=21973 where
datname='production-copy';
ERROR: column "datminmxid" is of type xid but expression is of type integer

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