PacketSize (ASE, DIR, SNC, SYC) database parameter
Description
When connecting to a database, specifies the packet size in
bytes that you want the server to set for transferring data to and
from your PowerBuilder application. A packet is
a fixed-size chunk of data for sending information over a network.
If the server has space limitations, it sets the packet size
to less than the specified PacketSize value. Otherwise, it sets
the size equal to the PacketSize value. The default value is 512
bytes.
When to specify PacketSize
You must specify the PacketSize parameter before connecting
to the database.
Controls
-
ASE, SYC Sybase Adaptive
Server Enterprise -
DIR Sybase DirectConnect
-
SNC SQL Native Client for Microsoft SQL Server
Syntax
|
1 |
PacketSize=<span>value</span> |
|
Parameter |
Description |
|---|---|
|
value |
A value specifying the packet size in |
Default
PacketSize=512 (4096 for SNC)
Usage
When to set
If your PowerBuilder application sends or receives large amounts
of text or image data from the server, setting the PacketSize value larger
than the default 512 bytes might speed performance by causing fewer network
read and write operations.
Adaptive Server Enterprise and DirectConnect
Before setting PacketSize for use with an Adaptive Server
Enterprise or DirectConnect database, you or your system administrator
must set the following configuration variables on the server for
PacketSize to take effect:
-
Additional netmem
Sets the maximum size of additional memory that can be used
for network packets larger than the default size. -
Maximum network packet size
Sets the maximum network packet size for all database users.
For instructions on setting these configuration
variables, see your database documentation.
Examples
To specify that the database server should set the
packet size equal to or less than 2048 bytes:
-
Database profile
Type the following in the Packet Size box on the Network page
in the Database Profile Setup dialog box:12048 -
Application
Type the following in code:
1SQLCA.DbParameter="PacketSize=2048"