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+Miscellaneous utility functions for PostgreSQL.
+Copyright (C) 1999, Massimo Dal Zotto <dz@cs.unitn.it>
+
+This software is distributed under the GNU General Public License
+either version 2, or (at your option) any later version.
+
+query_limit(n)
+
+	sets a limit on the maximum numbers of query returned from
+	a backend. It can be used to limit the result size retrieved
+	by the application for poor input data or to avoid accidental
+	table product while playying with sql.
+ 
+backend_pid()
+
+	return the pid of our corresponding backend.
+
+unlisten(relname)
+
+	unlisten from a relation or from all relations if the argument
+	is null, empty or '*'.
+	It is now obsoleted by the new unlisten command but still useful
+	if you want unlisten a name computed by the query.
+	Note that a listen/notify relname can be any ascii string, not
+	just valid relation names.
+
+min(x,y)
+max(x,y)
+
+	return the min or max bteween two integers.
+
+assert_enable(bool)
+
+	enable/disable assert checkings in the backend, if it has been
+	compiled with USE_ASSERT_CHECKING.
+
+assert_test(bool)
+
+	test the assert enable/disable code, if the backend has been
+	compiled with ASSERT_CHECKING_TEST.
+
+-- 
+Massimo Dal Zotto <dz@cs.unitn.it>