Re: recovering from "found xmin ... from before relfrozenxid ..."

On Thu, Aug 6, 2020 at 2:11 AM Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com> wrote:
> Okay, If you want I can remove the restriction on a toast table, but,
> then that means a user can directly remove the data chunks from the
> toast table without changing anything in the main table. This means we
> won't be able to query the main table as it will fail with an error
> like "ERROR: unexpected chunk number ...". So, we will have to find
> some way to identify the pointer to the chunks that got deleted from
> the toast table and remove that pointer from the main table. We also
> need to make sure that before we remove a tuple (pointer) from the
> main table, we identify all the remaining data chunks pointed by this
> tuple and remove them completely only then that table would be
> considered to be in a good state. Now, I am not sure if we can
> currently do all these things.

That's the user's problem. If they don't have a plan for that, they
shouldn't use this tool. I don't think we can or should try to handle
it in this code.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company