Обсуждение: odbc/ado problems
Hi all! I'm new here, so hello to everybody! I'm in a deep truble using postgesSQL 7.2.0 on a low-end pc with SUSE 8. I'm using some databases from that pc through odbc (7.3.200). Until now i had no problems with this solution, everithing worked fine. But today i wrote a small app, that converts/copies some data from a database to an other database. During this work i wrote a simple query as follows: select pers_driving_license from person where pers_id=23456 This should return a single varchar(20) field. Running this query over ADO/ODBC from a Delphi app tooks 50-100 secs. If i run this from pgAdmin II. it takes some msecs. The output of explain is: Index Scan using person_id_index on person (cost=0.00..3.14 rows=1 width=4) Any idea? Thanks in advance: steve
hello, did you use a read only / forward only cursor (adOpenForwardOnly) ? this is the fastest way to retreive data, other cursor types are much slower with postgres odbc. bye, Markus Donath. "Kroh Istv�n" <istvan.kroh@pomme.hu> schrieb im Newsbeitrag news:005a01c48f7f$9ff8ae70$0102a8c0@pomme001... > Hi all! > > I'm new here, so hello to everybody! > > I'm in a deep truble using postgesSQL 7.2.0 on a low-end pc with SUSE 8. I'm > using some databases from that pc through odbc (7.3.200). Until now i had no > problems with this solution, everithing worked fine. But today i wrote a > small app, that converts/copies some data from a database to an other > database. > > During this work i wrote a simple query as follows: > select pers_driving_license from person where pers_id=23456 > > This should return a single varchar(20) field. Running this query over > ADO/ODBC from a Delphi app tooks 50-100 secs. If i run this from pgAdmin II. > it takes some msecs. > > The output of explain is: > Index Scan using person_id_index on person (cost=0.00..3.14 rows=1 width=4) > > Any idea? > > Thanks in advance: steve > > > ---------------------------(end of broadcast)--------------------------- > TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org >
On 31 Aug 2004 at 19:26, Kroh Istv n wrote: > This should return a single varchar(20) field. Running this query over > ADO/ODBC from a Delphi app tooks 50-100 secs. If i run this from > pgAdmin II. it takes some msecs. I have found instantiating and using the ADO objects directly to be much faster than using the TADOConnection and TADOQuery components that come with Delphi. - This is in web apps where I'd construct the SQL and execute it with the Connection object. --Ray. ------------------------------------------------------------- Raymond O'Donnell http://www.galwaycathedral.org/recitals rod@iol.ie Galway Cathedral Recitals -------------------------------------------------------------