I would like to benchmark some SQL-queries agains my PostgreSQL database. Is there any way I can time SQL-queries using psql?
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4For more details on benchmarking PostgreSQL queries: dba.stackexchange.com/q/42012/9622 – Franck Dernoncourt May 15 '13 at 22:29
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Just turn on timing by entering:
\timing
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1From out bash, the "-c" option of
psqldoes not allow this setting. You can do this with something like:psql --o /dev/null <<EOF \timing select 1 EOF– 3manuek Jul 14 '16 at 17:38 -
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Timing can be turned on with \timing at the psql prompt (as Caleb already said).
If you are on 8.4 or above, you can add an optional on/off argument to \timing, which can be helpful if you want to be able to set timing on in .psqlrc - you can then set \timing on explicitly in a script where plain \timing would otherwise toggle it off
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The time that \timing returns also includes the network latency, if you're connecting to a remote server.
When you don't want that and don't need the query output too, better use EXPLAIN ANALYZE, which outputs the query plan with the planner estimates plus the actual execution times.
for example, EXPLAIN ANALYZE SELECT foo from bar ;
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2Using
explain analyzeyields times that are approximately double what I see when using\timing, which is the opposite of what I would expect based on the comments here regarding network latency. I suspect that there is overhead in the normal execution ofanalyzethat adds to the query time. Based on the docs, I think thatEXPLAIN (ANALYZE, TIMING OFF) SELECT foo FROM barwill give you more useful timing information. See postgresql.org/docs/9.6/static/sql-explain.html for details. – larsks Dec 5 '17 at 14:53
