Re: pg_resetwal --next-transaction-id may cause database failed to restart.

From: "movead(dot)li(at)highgo(dot)ca" <movead(dot)li(at)highgo(dot)ca>
To: "Alvaro Herrera" <alvherre(at)2ndquadrant(dot)com>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_resetwal --next-transaction-id may cause database failed to restart.
Date: 2020-07-08 01:21:08
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>The rationale for this interface is unclear to me. Please explain what
>happens in each case?
>In my proposal, we'd have:
>* Bad value, no --force:
> - program raises error, no work done.
>* Bad value with --force:
> - program raises warning but changes anyway.
>* Good value, no --force:
> - program changes value without saying anything
>* Good value with --force:
> - same
You have list all cases, maybe you are right it needs to raise a warning
when force a Bad value write which missed in the patch.
And I use '--test' in the patch, not '--force' temporary, maybe it needs
a deep research and discuss.

>The rationale for this interface is convenient knowledgeable access: the
>DBA runs the program with value X, and if the value is good, then
>they're done. If the program raises an error, DBA has a choice: either
>run with --force because they know what they're doing, or don't do
>anything because they know that they would make a mess.
Yes that's it, in addition the raised error, can tell the DBA to input a good

Highgo Software (Canada/China/Pakistan)
EMAIL: mailto:movead(dot)li(at)highgo(dot)ca

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