Jozsef Szalay wrote:
I have seen it on occasion that the total runtime reported by explain analyze was much higher than the actual time the query needed to complete. The differences in my case ranged between 20-120 seconds. I'm just curious if anyone else has experienced this and whether there is something that I can do to convince explain analyze to report the execution time of the query itself rather than the time of its own execution. Engine version is 8.1.1.
I think it's down to all the gettime() calls that have to be made to measure how long each stage of the query takes. In some cases these can take a substantial part of the overall query time. I seem to recall one of the BSDs was particularly bad in this respect a couple of years ago. Does that sound like your problem?
-- Richard Huxton Archonet Ltd
