From: | vignesh C <vignesh21(at)gmail(dot)com> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
Cc: | Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Anthony Nowocien <anowocien(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Filip Rembiałkowski <filip(dot)rembialkowski(at)gmail(dot)com> |
Subject: | Re: dropdb --force |
Date: | 2019-09-18 03:59:39 |
Message-ID: | CALDaNm3YJQRYoWnavuJ3_yBvgpxvNxHdwGPzUssFZuCwSgJXbg@mail.gmail.com |
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Lists: | pgsql-hackers |
On Wed, Sep 18, 2019 at 8:30 AM Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
>
>
Hi Pavel,
One Comment:
In the documentation we say drop database will fail after 60 seconds
<varlistentry>
<term><literal>FORCE</literal></term>
<listitem>
<para>
Attempt to terminate all existing connections to the target database.
</para>
<para>
This will fail, if current user has no permissions to terminate other
connections. Required permissions are the same as with
<literal>pg_terminate_backend</literal>, described
in <xref linkend="functions-admin-signal"/>.
This will also fail, if the connections do not terminate in 60 seconds.
</para>
</listitem>
</varlistentry>
But in TerminateOtherDBBackends:
foreach (lc, pids)
+ {
+ int pid = lfirst_int(lc);
+
+ (void) kill(pid, SIGTERM); /* ignore any error */
+ }
+
+ /* sleep 100ms */
+ pg_usleep(100 * 1000L);
+ }
We check for any connected backends after sending kill signal in
CountOtherDBBackends and throw error immediately.
I had also tested this scenario to get the following error immediately:
test=# drop database (force) test1;
ERROR: database "test1" is being accessed by other users
DETAIL: There is 1 other session using the database.
I feel some change is required to keep documentation and code in sync.
Regards,
Vignesh
EnterpriseDB: http://www.enterprisedb.com
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