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help / color / mirror / Atom feedFrom: Mark Dilger <[email protected]>
To: Peter Geoghegan <[email protected]>
Cc: Pavel Borisov <[email protected]>
Cc: Alexander Korotkov <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Noah Misch <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Aleksander Alekseev <[email protected]>
Cc: Postgres hackers <[email protected]>
Cc: Maxim Orlov <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: Greg Stark <[email protected]>
Cc: Julien Rouhaud <[email protected]>
Cc: David Steele <[email protected]>
Cc: Maxim Orlov <[email protected]>
Cc: [email protected]
Subject: Re: [PATCH] Improve amcheck to also check UNIQUE constraint in btree index.
Date: Fri, 17 May 2024 13:10:46 -0700
Message-ID: <[email protected]> (raw)
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> On May 17, 2024, at 1:00 PM, Peter Geoghegan <[email protected]> wrote:
>
> Many different parts of the B-Tree code will fight against allowing
> duplicates of the same value to span multiple leaf pages -- this is
> especially true for unique indexes.
The quick-and-dirty TAP test I wrote this morning is intended to introduce duplicates across page boundaries, not to test for ones that got there by normal database activity. In other words, the TAP test forcibly corrupts the index by changing a value on one side of a boundary to be equal to the value on the other side of the boundary. Prior to the corrupting action the values were all unique.
—
Mark Dilger
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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Subject: Re: [PATCH] Improve amcheck to also check UNIQUE constraint in btree index.
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