From: PG Bug reporting form <noreply@postgresql.org>
To: pgsql-bugs@lists.postgresql.org
Cc: 52194501011@stu.ecnu.edu.cn
Subject: BUG #17018: Two versions of the same row of records are returned in one query
Date: Tue, 18 May 2021 13:49:19 +0000
Message-ID: <17018-505b3c8bd8b551ff@postgresql.org> (raw)
The following bug has been logged on the website:
Bug reference: 17018
Logged by: Keqiang Li
Email address: 52194501011@stu.ecnu.edu.cn
PostgreSQL version: 9.6.21
Operating system: CentosLinux release 7.4.1708 ( Core)
Description:
Schema and Initial data:
Create Table t(a int primary key, b int);
Insert into t values(1,2);
Insert into t values(2,3);
Operation:
There are two sessions executing at the same time.
[Time0, SessonA]
> Begin;
> set transaction isolation level repeatable read;
> Select * from t where a=1;
[Time1, SessonB]
> Begin;
> set transaction isolation level read committed;
> Delete from t where a=2;
> Commit;
[Time2, SessonA]
> Insert into t values(2,4);
> Select * from t where a=2;
Here, we expect PostgreSQL Server to return a row:
2 4
However, it returns two rows:
2 4
2 3
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Subject: Re: BUG #17018: Two versions of the same row of records are returned in one query
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