CREATE EVENT randomize_first_checkpoint
   TYPE DatabaseStart
HANDLER
   BEGIN
      declare @num  int;    -- total number of databases running on server
      declare @ord  int;    -- ordinal of this database within list of databases
      declare @sec  int;
      declare @min  int;

      -- wait some time to let all databases to start (from command line!)
      WAITFOR DELAY '0:0:10';

      -- figure out how many databases are running on the server?
      SELECT number as num, db_name(number) as name, number(*) as ord
        into #temp
        from sa_db_list()
       order by num;
      SET @num = ( select count(*) from #temp );

      -- ... and what position is this database on the server?
      SET @ord = ( select ord from #temp where name = db_name() );

      -- assume checkpoints occur at 20 minute regular intervals (i.e. 20*60 seconds)
      -- figure out how long to wait before we force a checkpoint on this database
      set @sec  = ( 20*60 )*( @ord - 1 ) / @num;
      set @min  = @sec / 60;
      set @sec  = @sec - 60*@min;

      execute immediate 'WAITFOR DELAY ''0:' || @min || ':' || @sec || '''';
      checkpoint;
   END;