[ psqlodbc-Bugs-1005624 ] The limitation for number of connection with ODBC driver

Bugs item #1005624, was opened at 2007-05-29 09:21
You can respond by visiting:
http://pgfoundry.org/tracker/?func=detail&atid=538&aid=1005624&group_id=1000125

Category: None
Group: None
Status: Open
Resolution: None
Priority: 3
Submitted By: Dmitry Dmitriev (dmitry_12)
Assigned to: Hiroshi Saito (h-saito)
Summary: The limitation for number of connection with ODBC driver

Initial Comment:
We have the big trouble, when our application try to open number of
connection more than 128 with psqlODBC-08_02_0200 driver.

The following file fragment psqlodbc.h from official PostgreSQL web site:
http://wwwmaster.postgresql.org/download/mirrors-ftp?file=%2Fodbc%2Fversions%2Fsrc%2Fpsqlodbc-08.02.0400.tar.gz

...
#define MAX_MESSAGE_LEN 65536 /* This puts a limit on
* query size but I don't */
/* see an easy way round this - DJP 24-1-2001 */
#define MAX_CONNECT_STRING 4096
#define ERROR_MSG_LENGTH 4096
#define FETCH_MAX 100 /* default number of rows to cache
* for declare/fetch */
#define TUPLE_MALLOC_INC 100
#define SOCK_BUFFER_SIZE 4096 /* default socket buffer
* size */
#define MAX_CONNECTIONS 128 /* conns per environment
* (arbitrary) */
#define MAX_FIELDS 512
#define BYTELEN 8
#define VARHDRSZ sizeof(Int4)
...

We need at least 2048 connections for our application.
Can you help us to solve the problem?

Thank you,
Dmitry Dmitriev
Technical Director
Magistral LLC.

email: dydmitriev(at)yahoo(dot)com

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>Comment By: Hiroshi Inoue (hinoue)
Date: 2007-05-30 06:21

Message:
Could you try the the drivers on testing for 8.2.0402
at http://www.geocities.jp/inocchichichi/psqlodbc/
?

regards,
Hiroshi Inoue

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