Re: Copy command Faster than original select
От | Pavel Stehule |
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Тема | Re: Copy command Faster than original select |
Дата | |
Msg-id | CAFj8pRDkenXG8-cAMuGNgyjoR9Ne+RRA5xdz1DWiuLqWDdKX7g@mail.gmail.com обсуждение исходный текст |
Ответ на | Copy command Faster than original select (belal <belalhamed@gmail.com>) |
Ответы |
Re: Copy command Faster than original select
|
Список | pgsql-performance |
Hi
2015-02-06 9:30 GMT+01:00 belal <belalhamed@gmail.com>:
I made complex select using PGAdmin III Query Editor, Postgre server 9.3
select ... from mytable join .. join ... order by ....
I get [Total query runtime: 8841 ms. 43602 rows retrieved.]
but when I use
copy ([same above select]) to '/x.txt'
I get [Query returned successfully: 43602 rows affected, 683 ms execution
time.]
these test made on the same machine as the postgresql server.
can anyone explain huge difference in executing time?
probably terrible uneffective execution plan
can you send a explain analyze of your slow query?
Regards
Pavel
Pavel
best regards all
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