From: "Aya Iwata (Fujitsu)" <iwata.aya@fujitsu.com>
To: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: [PROPOSAL] Termination of Background Workers for ALTER/DROP DATABASE
Thread-Topic: [PROPOSAL] Termination of Background Workers for ALTER/DROP
 DATABASE
Thread-Index: Adw0Q6iYueu3o2DFQ0mAqFGMYYi8fg==
Date: Fri, 3 Oct 2025 09:27:23 +0000
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Hi,

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
If the background workers connect to databases, some database-related comma=
nds
like ALTER DATABASE RENAME and ALTER DATABASE SET TABLESPACE cannot be done=
.
Users must do DROP EXTENSION related with workers, or terminate them by the=
mselves
if they want to drop or alter the database.

Proposal
=3D=3D=3D=3D=3D=3D=3D=3D
Based on above, I would like to propose to terminate background workers aut=
omatically
when such SQLs are executed.

This feature allows the DBMS daemon to send a termination signal to backgro=
und workers
created by users currently operating on the database when executing command=
s that make
significant changes to the database.

To receive the termination signal, the background worker must call the
AcceptBackgroundWorkerCancel() function, using the database's OID and a fla=
g
indicating whether to terminate. This means existing background worker proc=
esses
will not abruptly terminate.

This termination occurs when executing the DROP DATABASE, ALTER DATABASE RE=
NAME TO,
or ALTER DATABASE SET TABLE SPACE commands, which check the existence of pr=
ocesses.

When a user creates a background worker to perform some data processing or =
monitoring,
and wants to terminate it along with the database deletion, this feature en=
ables
achieving that goal.

The test set for this feature will be shared later.

How do you feel? Your feedback is very welcome.

Regards,
Aya Iwata
Fujitsu Limited

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Hi,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Back=
ground<br>
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<br>
If the background workers connect to databases, some database-related comma=
nds<br>
like ALTER DATABASE RENAME and ALTER DATABASE SET TABLESPACE cannot be done=
.<br>
Users must do DROP EXTENSION related with workers, or terminate them by the=
mselves<br>
if they want to drop or alter the database.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Prop=
osal<br>
=3D=3D=3D=3D=3D=3D=3D=3D<br>
Based on above, I would like to propose to terminate background workers aut=
omatically<br>
when such SQLs are executed.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">This=
 feature allows the DBMS daemon to send a termination signal to background =
workers<br>
created by users currently operating on the database when executing command=
s that make<br>
significant changes to the database.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">To r=
eceive the termination signal, the background worker must call the<br>
AcceptBackgroundWorkerCancel() function, using the database's OID and a fla=
g<br>
indicating whether to terminate. This means existing background worker proc=
esses<br>
will not abruptly terminate.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">This=
 termination occurs when executing the DROP DATABASE, ALTER DATABASE RENAME=
 TO,<br>
or ALTER DATABASE SET TABLE SPACE commands, which check the existence of pr=
ocesses.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">When=
 a user creates a background worker to perform some data processing or moni=
toring,<br>
and wants to terminate it along with the database deletion, this feature en=
ables<br>
achieving that goal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">The =
test set for this feature will be shared later.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">How =
do you feel? Your feedback is very welcome.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt"><o:p=
>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Rega=
rds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Aya =
Iwata <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11.0pt">Fuji=
tsu Limited<o:p></o:p></span></p>
</div>
</body>
</html>

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