[SQL] How to shrink database in postgresql

[Rehan Saleem]

hi ,
how can i shrink database in postgresql here is a MS-SQL store procedure which 
shrinks the database. how same task can be achieved in postgresql.


ALTER PROCEDURE [dbo].[sp_CleanUpDB]
AS
declare @db nvarchar(50)
select @db = db_name()
DBCC SHRINKDATABASE (@db, 10)

thanks