diff --git a/check_postgres.pl b/check_postgres.pl
index b7c8417d..e0eff63b 100755
--- a/check_postgres.pl
+++ b/check_postgres.pl
@@ -5057,8 +5057,15 @@ sub check_locks {
default_critical => 150,
});
- $SQL = q{SELECT granted, mode, datname FROM pg_locks l RIGHT JOIN pg_database d ON (d.oid=l.database) WHERE d.datallowconn};
- my $info = run_command($SQL, { regex => qr[\s*\w+\s*\|\s*] });
+ $SQL = q{SELECT granted, mode, d.datname}.
+ q{ FROM pg_database d}.
+ q{ LEFT JOIN pg_stat_activity a ON (d.datname=a.datname)}.
+ q{ LEFT JOIN pg_locks l ON (l.pid = a.procpid)}.
+ q{ WHERE d.datallowconn}.
+ q{ AND COALESCE(l.locktype,'') <> 'virtualxid'};
+ my $SQL92;
+ ($SQL92 = $SQL) =~ s/procpid/pid/;
+ my $info = run_command($SQL, { regex => qr[\s*\w+\s*\|\s*], version => [">9.1 $SQL92"] });
# Locks are counted globally not by db.
# We output for each db, following the specific warning and critical :
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