Re: [PERFORM] Explain Analyze - actual time in loops

From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of Neto pr
Sent: Thursday, September 07, 2017 11:17 PM
To: pgsql-performance@postgresql.org
Subject: [PERFORM] Explain Analyze - actual time in loops

 

…

################################ ###################################
   -> Index Scan using idx_l_partkeylineitem000x on lineitem (cost = 0.57..97.65 rows = 26 width = 36)
                  (current time = 23.615..419.113 rows = 30 loops = 26469)
                  Index Cond: (l_partkey = part.p_partkey)
################################################## #################
According to the documentation, one should multiply the Actual Time by the number of Loops.
That is: 419113 ms -> 419113/1000/60 = 6.9 minutes * 26469 (loops) = 182.6 minutes.

But how does this stretch take 182.6 minutes, if the entire query ran in 66 minutes?

……………….
thank you and best regards
[] 's Neto

Neto,

The time you see there is in ms, so the point (‘.’) you see is the digital point.

So, it is 419.113ms or a little less than half a second (0.419sec).

Igor Neyman