On Sat, Dec 29, 2018, 07:17 Mark Rotteveel <m...@lawinegevaar.nl wrote: > I was doing an artificial performance test on Firebird by inserting into > a table that had a column > > updatedts timestamp default localtimestamp > > The insert did not touch this column (so the default is applied). To my > surprise, that was about 7 - 10 % slower than using CURRENT_TIMESTAMP: > > updatedts timestamp default current_timestamp > > Why is that? > > I'd expect equivalent performance, or otherwise the reverse given the > current_timestamp timestamp with time zone value needs to be converted > to a timestamp without time zone. >
The cached in request value is now the timestamp with tz, then localtimestamp requires a conversion. That conversion requires to open ICU calendar to get the effective displacement. Please try to alter the session time zone to a displacement (set time zone '-02:00') and see if the performance drop is equivalent. Adriano
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