postgres=# explain analyze select random();  
                                       QUERY PLAN                                         
----------------------------------------------------------------------------------------  
 Result  (cost=0.01..0.02 rows=1 width=0)  
   Rows out:  1 rows with 0.017 ms to end, start offset by 0.056 ms.  
   InitPlan  
     ->  Result  (cost=0.00..0.01 rows=1 width=0)  
           Rows out:  1 rows with 0.004 ms to end of 2 scans, start offset by 0.059 ms.  
 Slice statistics:  
   (slice0)    Executor memory: 29K bytes.  
   (slice1)    Executor memory: 29K bytes.  
 Statement statistics:  
   Memory used: 128000K bytes  
 Total runtime: 0.074 ms  
(11 rows)