Re: What is the fastest way to get a resultset

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Re: What is the fastest way to get a resultset

От:
"Magnus Naeslund(f)" <mag@fbab.net>
Дата:
Bupp Phillips  wrote:
> I'm very new to Postgresql, so don't beat me up to bad if you see a
> problem, just inform me what I've done wrong.
>
> I'm use Postgresql 7.2 (PeerDirect's Windows port) on Win2000 384MB
> RAM 10GB of Free space 800 Mhz, using the ODBC driver 7.03.01.00.
>
> I have a table that has 103,000 records in it (record size is about
> 953 bytes) and when I do a select all (select * from ) it
> takes a whopping 30 secs for the data to return!!
>
> SQLServer on the other hand takes 6 secs, but you can also use what is
> called a firehose cursor, which will return the data in < 1 sec.
>
> I have done everything that I know how to speed this up, does anyone
> have any advise?
>

Probably you need to fetch more than one row at a time.
I made that misstake once myself :)

Magnus

Re: What is the fastest way to get a resultset

От:
Neil Conway <neilc@samurai.com>
Дата:
On Tue, Aug 26, 2003 at 02:18:23AM -0700, Bupp Phillips wrote:
> It there a way to get server side cursors with Postgresql like SQLServer has
> or is this a limitation that it has?

http://www.postgresql.org/docs/7.3/static/sql-declare.html
http://www.postgresql.org/docs/7.3/static/sql-fetch.html

-Neil

What is the fastest way to get a resultset

От:
"Bupp Phillips" <hello@noname.com>
Дата:
I'm very new to Postgresql, so don't beat me up to bad if you see a problem,
just inform me what I've done wrong.

I'm use Postgresql 7.2 (PeerDirect's Windows port) on Win2000 384MB RAM 10GB
of Free space 800 Mhz, using the ODBC driver 7.03.01.00.

I have a table that has 103,000 records in it (record size is about 953
bytes) and when I do a select all (select * from ) it takes a
whopping 30 secs for the data to return!!

SQLServer on the other hand takes 6 secs, but you can also use what is
called a firehose cursor, which will return the data in < 1 sec.

I have done everything that I know how to speed this up, does anyone have
any advise?

Thanks

Re: What is the fastest way to get a resultset

От:
"Bupp Phillips" <hello@noname.com>
Дата:
Is this something that can be done thru a SQL statement, or are you saying
that I need to develop logic to handle this because the database won't hold
the resultset on the server, but instead sends it all to the client?

It there a way to get server side cursors with Postgresql like SQLServer has
or is this a limitation that it has?

Thanks

"Jeff"  wrote in message
news:Pine.BSF.4.44.0308251645360.15800-100000@torgo.978.org...
> On Mon, 25 Aug 2003, Bupp Phillips wrote:
>
> >
> > I have a table that has 103,000 records in it (record size is about 953
> > bytes) and when I do a select all (select * from ) it takes a
> > whopping 30 secs for the data to return!!
> >
> > SQLServer on the other hand takes 6 secs, but you can also use what is
> > called a firehose cursor, which will return the data in < 1 sec.
> >
> You probably want a cursor.
> Typically what happens is postgres sends _all_ the data to the client -
> which can be rather substantial.  A cursor allows you to say "get me the
> first 1000 records. now the next 1000" - it should get you the speed you
> want.
>
>
> --
> Jeff Trout 
> http://www.jefftrout.com/
> http://www.stuarthamm.net/
>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org
>

Re: What is the fastest way to get a resultset

От:
"Bupp Phillips" <hello@noname.com>
Дата:
So there are no settings for PG to can give me this same (fast) capability
just by issuing a SQL statement thru the ODBC driver?

The reason I can't go the route of a DECLARE CURSOR is because my
application runs on multiple databases, so I have stay clear of certain
routines that may are may not be supported on another database.


"Neil Conway"  wrote in message
news:20030826182624.GF64198@home.samurai.com...
> On Tue, Aug 26, 2003 at 02:18:23AM -0700, Bupp Phillips wrote:
> > It there a way to get server side cursors with Postgresql like SQLServer
has
> > or is this a limitation that it has?
>
> http://www.postgresql.org/docs/7.3/static/sql-declare.html
> http://www.postgresql.org/docs/7.3/static/sql-fetch.html
>
> -Neil
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 2: you can get off all lists at once with the unregister command
>     (send "unregister YourEmailAddressHere" to majordomo@postgresql.org)
>

Re: What is the fastest way to get a resultset

От:
Jeff <threshar@torgo.978.org>
Дата:
On Mon, 25 Aug 2003, Bupp Phillips wrote:

>
> I have a table that has 103,000 records in it (record size is about 953
> bytes) and when I do a select all (select * from ) it takes a
> whopping 30 secs for the data to return!!
>
> SQLServer on the other hand takes 6 secs, but you can also use what is
> called a firehose cursor, which will return the data in < 1 sec.
>
You probably want a cursor.
Typically what happens is postgres sends _all_ the data to the client -
which can be rather substantial.  A cursor allows you to say "get me the
first 1000 records. now the next 1000" - it should get you the speed you
want.


--
Jeff Trout 
http://www.jefftrout.com/
http://www.stuarthamm.net/
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