Executing Select count(a.*) from (select ... from mytable join .. join ...
order by ) as a;
Total query runtime: 454 ms.
1 row retrieved.
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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
this slowdown can be enforced by slow client (or slow network).
As I said i made the tow test on the same machine as the server using
PGAdmin no network involved.
pgAdmin is not terrible fast
I also try the same query from my application using libpq I get same results
regards
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2015-02-06 9:44 GMT+01:00 Belal Al-Hamed belalha...@gmail.com:
thanks,
but isn't copy use the same plan ???
aha - I was wrong,
this slowdown can be enforced by slow client (or slow network). pgAdmin is
not terrible fast. Try to execute your query from psql.
Regards
Pavel
any way this
On Fri, Feb 6, 2015 at 6:44 AM, Belal Al-Hamed belalha...@gmail.com wrote:
but isn't copy use the same plan ???
any way this is the query play
Sort (cost=15402.76..15511.77 rows=43602 width=184)
Can you try again but with EXPLAIN *ANALYZE* (not only EXPLAIN)?
Best regards,
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Matheus
2015-02-06 10:50 GMT+01:00 Belal Al-Hamed belalha...@gmail.com:
fast as
Query returned successfully: 43602 rows affected, 1089 ms execution time.
so bottle neck have to be some where between client and server
Pavel
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Hi
2015-02-06 9:30 GMT+01:00 belal belalha...@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])
2015-02-06 10:15 GMT+01:00 Belal Al-Hamed belalha...@gmail.com:
this slowdown can be enforced by slow client (or slow network).
As I said i made the tow test on the same machine as the server using
PGAdmin no network involved.
pgAdmin is not terrible fast
I also try the same query from my
fast as
Query returned successfully: 43602 rows affected, 1089 ms execution time.
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http://postgresql.nabble.com/Copy-command-Faster-than-original-select-tp5836886p5836902.html
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Sent
Let me change my question to this perhaps it would be clearer
why writing data result of select statment from PG server to file on disk
using copy statement is much faster than getting same data through PGAdmin
via libpg on the same PC on the same system on the same connection
(localhost) ?
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belal belalha...@gmail.com writes:
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
so bottle neck have to be some where between client and server
that's what I need to know !
where is the bug to made this performance
Can you try again but with EXPLAIN *ANALYZE* (not only EXPLAIN)?
it's not a matter of plan problem I think, it's related to sending data
from server to client,
2015-02-06 14:39 GMT+01:00 Belal Al-Hamed belalha...@gmail.com:
Let me change my question to this perhaps it would be clearer
why writing data result of select statment from PG server to file on disk
using copy statement is much faster than getting same data through PGAdmin
via libpg on the
On Fri, Feb 6, 2015 at 11:39 AM, Belal Al-Hamed belalha...@gmail.com
wrote:
Let me change my question to this perhaps it would be clearer
Perhaps if you answer all the questions asked, we'll be able to spot where
is the bottleneck you are seeing. Could be many factors.
Best regards,
--
On Fri, Feb 6, 2015 at 10:27 AM, Belal Al-Hamed belalha...@gmail.com
wrote:
so bottle neck have to be some where between client and server
that's what I need to know !
where is the bug to made this performance
Did you executed it from psql? Tried with \copy also? (sorry if you
answered it
Sent: Friday, February 06, 2015 3:31 AM
To: pgsql-performance@postgresql.org
Subject: [PERFORM] Copy command Faster than original select
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
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