On Tue, 09 Oct 2007 10:34:45 -0000 [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 140000 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 140000 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 150000 records > at 45 KB/s (average speed) (132 octets/record * 150000 = 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 8606 Mail: [EMAIL PROTECTED] Telefax: 0271 231 8608 Web: http://www.invenius.de Key fingerprint = 90DF FF40 582E 6D6B BADF 6E6A A74E 67E4 E788 2651
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