Re: Database Performance problem - Mailing list pgsql-novice

Ron Johnson wrote:

On Mon, 2003-01-20 at 05:11, joepie Platteau wrote: 

A question about the performance of postgresql...

Situation :
I created a Postgresql Database with 2 tables : T-Persons and T-Address
In both tables are almost 70000 records.
I also created the same Database in MsAccess (and put it on the same 
server) with the same tables (and data)

I connect these tables from my MsAccess2000 - frontend and run the 
following query :

SELECT [T-persons].[Id-person], [T-address].Street, [T-address].Number
FROM [T-persons] INNER JOIN [T-addres] ON [T-persons].[ID-address] = 
[T-address].[ID-address];

When I run this query1. with the tables of Postgresql, it takes approx. 58 seconds.2. with the tables of MsAccess, it takes approx. 6 seconds.3. directly (without connection to Access) on the server, it takes 5 
seconds   

Sounds like you're using SQL Server, w/ Access as the front-end.
 

I already tried optimising the Postgresql with Vacuum and I also created 
an index on the field "ID-address" in T-persons.
All this doesn't help.  I also have the latest version of ODBC.

Are there any other possibilities to make this run faster?
I tried to make the query as Pass-through query, but this also doesn't 
help a lot...(52 seconds)   

Sooooo,

What version of Pg are you using?  
What OS, and it's version?
What are the table definitions?
What does postgresql.conf look like?  (Please eliminate comments.)
http://www.tuxedo.org/~esr/faqs/smart-questions.html

PostgreSQL version : 7.2.5
ODBC-driver version : 7.2.1
Server version  (I tried on 2 different servers):
Debian Linux 2.4.19 and Debian Linux 2.4.18

Content of Postgresql.conf  :
debug_level = 0
log_connections = on
log_pid = on
log_timestamp = on
syslog = 2
silent_mode = off
syslog_facility = LOCAL0
trace_notify = off
max_connections = 64
shared_buffers = 128
tcpip_socket = 1

T-persons :
CREATE TABLE "T-persons" (
  "Id-person" int8 DEFAULT nextval('"T-persons_Id-persons_seq"'::text) NOT NULL,
  "ID-address" int8,
                        ------  Here follow a lot more fields -------
  CONSTRAINT "T-persons_pkey" PRIMARY KEY ("Id-person")
) WITH OIDS;
GRANT ALL ON TABLE "T-persons" TO platteau;

T-address
CREATE TABLE "T-address" (
  "ID-address" int8 DEFAULT nextval('"T-address_ID-address_seq"'::text) NOT NULL,
  "Street" varchar(50),
  "Number" varchar(50),
                        --------  Here follow a few more fields  ----------
  CONSTRAINT "T-address_pkey" PRIMARY KEY ("ID-address")
) WITH OIDS;
GRANT ALL ON TABLE "T-address" TO platteau;


Thanks.
Joepie.