Re: [GENERAL] slow request
Hi ! thanks for your answers My network works correctly, I have no other problems. I can send/receive huge files quickly using the windows file share protocol. Using psql tool, I have the same results ... very slow traffic ... :( I measure these time and speeds using my watch and a free network tool : ShowTraffic (Ethereal gives me the same results). I will try using another switch ... On 10/9/07, Frank Finner <[EMAIL PROTECTED]> wrote: > > On Tue, 09 Oct 2007 10:34:45 - [EMAIL PROTECTED] thought long, > then sat down and wrote: > > > Hi ! > > I am using postgreSQL v8.1.5 with latest odbc driver v8.02.0500. > > I have very slow request between my server and my client. They are > > both on the same switch 100Mb/s. I have no particular network > > problems. > > I use the pgadmin tool to do my request. > > > > My database is compose of one table. This table has some simple fields > > (varchar & int, less than 500 bytes) and its primary key is a > > varchar(32) (CLSID). This table has 14 records. > > I know the primary key as a clsid is not the best choice, but it is > > mine :) > > > > The request "select * from mytable" on the server takes > > approximatively 30 seconds. > > The same request on the client takes approximatively 400 seconds ! > > What I do not understand is that my network traffic during this > > request on the client side is very low. It is less than 100KB/s ! > > > > Why is it so slow ? I suppose that my 14 records are retrieve one > > by one... is it true ? if yes, why ? > > > > I try to do the same thing with another table with a primary key as > > 'int4'. The result is the same : 540 secs to retrieve 15 records > > at 45 KB/s (average speed) (132 octets/record * 15 = 19MB / 45 KB/ > > s = 430 seconds) > > > > How can I improve these performances ? > > thanks > > Mike > > > > > > ---(end of broadcast)--- > > TIP 9: In versions below 8.0, the planner will ignore your desire to > >choose an index scan if your joining column's datatypes do not > >match > > > This could be a DNS related problem, if not the request itself, but the > connect, is slow. How did you measure these times and speeds? > > -- > Frank Finner > > Invenius - Lösungen mit Linux > Köpfchenstraße 36 > 57072 Siegen > Telefon: 0271 231 8606Mail: [EMAIL PROTECTED] > Telefax: 0271 231 8608Web: http://www.invenius.de > Key fingerprint = 90DF FF40 582E 6D6B BADF 6E6A A74E 67E4 E788 2651 > > >
Re: [GENERAL] slow request
On Oct 9, 2007, at 6:34 AM, [EMAIL PROTECTED] wrote: Hi ! I am using postgreSQL v8.1.5 with latest odbc driver v8.02.0500. I have very slow request between my server and my client. They are both on the same switch 100Mb/s. I have no particular network problems. I use the pgadmin tool to do my request. My database is compose of one table. This table has some simple fields (varchar & int, less than 500 bytes) and its primary key is a varchar(32) (CLSID). This table has 14 records. I know the primary key as a clsid is not the best choice, but it is mine :) The request "select * from mytable" on the server takes approximatively 30 seconds. The same request on the client takes approximatively 400 seconds ! What I do not understand is that my network traffic during this request on the client side is very low. It is less than 100KB/s ! Why is it so slow ? I suppose that my 14 records are retrieve one by one... is it true ? if yes, why ? I try to do the same thing with another table with a primary key as 'int4'. The result is the same : 540 secs to retrieve 15 records at 45 KB/s (average speed) (132 octets/record * 15 = 19MB / 45 KB/ s = 430 seconds) How can I improve these performances ? This has been reported before, IIRC, and one issue was that pgadmin spent a lot longer rendering the data than it did retrieving it. So before you look any further, run the same query from psql and see if that changes anything. Cheers, Steve ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [GENERAL] slow request
On Tue, 09 Oct 2007 10:34:45 - [EMAIL PROTECTED] thought long, then sat down and wrote: > Hi ! > I am using postgreSQL v8.1.5 with latest odbc driver v8.02.0500. > I have very slow request between my server and my client. They are > both on the same switch 100Mb/s. I have no particular network > problems. > I use the pgadmin tool to do my request. > > My database is compose of one table. This table has some simple fields > (varchar & int, less than 500 bytes) and its primary key is a > varchar(32) (CLSID). This table has 14 records. > I know the primary key as a clsid is not the best choice, but it is > mine :) > > The request "select * from mytable" on the server takes > approximatively 30 seconds. > The same request on the client takes approximatively 400 seconds ! > What I do not understand is that my network traffic during this > request on the client side is very low. It is less than 100KB/s ! > > Why is it so slow ? I suppose that my 14 records are retrieve one > by one... is it true ? if yes, why ? > > I try to do the same thing with another table with a primary key as > 'int4'. The result is the same : 540 secs to retrieve 15 records > at 45 KB/s (average speed) (132 octets/record * 15 = 19MB / 45 KB/ > s = 430 seconds) > > How can I improve these performances ? > thanks > Mike > > > ---(end of broadcast)--- > TIP 9: In versions below 8.0, the planner will ignore your desire to >choose an index scan if your joining column's datatypes do not >match This could be a DNS related problem, if not the request itself, but the connect, is slow. How did you measure these times and speeds? -- Frank Finner Invenius - Lösungen mit Linux Köpfchenstraße 36 57072 Siegen Telefon: 0271 231 8606Mail: [EMAIL PROTECTED] Telefax: 0271 231 8608Web: http://www.invenius.de Key fingerprint = 90DF FF40 582E 6D6B BADF 6E6A A74E 67E4 E788 2651 pgpiCuixCItnO.pgp Description: PGP signature
Re: [GENERAL] slow request
On 10/9/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > Hi ! > I am using postgreSQL v8.1.5 with latest odbc driver v8.02.0500. > I have very slow request between my server and my client. They are > both on the same switch 100Mb/s. I have no particular network > problems. > I use the pgadmin tool to do my request. > > My database is compose of one table. This table has some simple fields > (varchar & int, less than 500 bytes) and its primary key is a > varchar(32) (CLSID). This table has 14 records. > I know the primary key as a clsid is not the best choice, but it is > mine :) > > The request "select * from mytable" on the server takes > approximatively 30 seconds. > The same request on the client takes approximatively 400 seconds ! > What I do not understand is that my network traffic during this > request on the client side is very low. It is less than 100KB/s ! > > Why is it so slow ? I suppose that my 14 records are retrieve one > by one... is it true ? if yes, why ? Who cares one way or another... They're fast locally and slow remotely, which means you've likely got some kind of networking issue going on here. How fast can you network copy things from the server to the client without pgsql involved? (i.e. rsync, ftp, wget http, scp etc...) What OS are the client and server running? ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
