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From: Wim Rouquart <[email protected]>
To: Adrian Klaver <[email protected]>
To: [email protected] <[email protected]>
Subject: RE: Index (primary key) corrupt?
Date: Fri, 19 Sep 2025 09:40:44 +0000
Message-ID: <AS2PR05MB107548567EEDAAB3AF74A6C59EF11A@AS2PR05MB10754.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <[email protected]>
References: <AS2PR05MB1075477BA334D4DA262AD75BFEF16A@AS2PR05MB10754.eurprd05.prod.outlook.com>
	<[email protected]>

Internal

>> Internal
>>
>>
>> Hello,
>>
>>When doing a pg_dump of one of our databases one of the tables primary
>> keys doesn’t get exported. Pg_dump just skips this index, without any
>> warning whatsoever (verbose mode was used to doublecheck).

> What is the complete table definition?

CREATE TABLE bcf_work_type (
        id bigserial NOT NULL,
        aml_score int8 NOT NULL,
        CONSTRAINT idx_376814_primary PRIMARY KEY (id)
);

> What is the complete pg_dump command being given?

pg_dump --verbose -p <xxx> -U <xxx> -d <xxx> > dumpverbose.sql 2> dumpverbose.log

> Is the PK definition in the pg_dump file? For plain text format can you grep/find it?

It is in neither, that’s why I'm sure it doesn't get exported. After a REINDEX statement it is.

>How is the dump file being restored?

As the code to generate the index is not in the dumpfile this seems irrelevant to me.

>>
>> When doing a REINDEX the issue is fixed.
>>
>> As this seems to me to be some form of index corruption, I tried using
>> amcheck (bt_index_check and bt_index_parent_check) to verify for
>> corruption but both resulted with no issues (the index is a btree).
>>
>> I would expect the corruption to show up when using amcheck, am I
>> hitting some kind of bug here?
>>
>> Are there any other ways to doublecheck for corruption (without
>> enabling checksum upfront)?
>>
>> This concerns a PostgreSQL version 15 btw.
>>
>> Thanks!
>>

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