Controlling packet size from 32K to 4K for SQL DSN

Question

I've been engaged by my SQL administrator to find out how the packet size can be reduced from 32K to 4K in the CF9 Enterprise environment in a multi-server configuration. Although it's not likely related to the version rather than the JDBC Drivers provided in the product, none the less there is no clear way of identifying where this could be changed within the ColdFusion DSN's.  Does anybody have any insight on how to control the packet sizes in a SQL DSN i Coldfusion 9 or 9.0.1?  Would be greatly appreciated.

Avatar · Accepted Answer

If you are using MSSQL, open the CF administrator, goto the datasource, click the "Advanced Settings" button and enter in:

packetSize=8

within the Connection String textarea box then hit submit, there should be no need to restart anything

Connection details for the PacketSize property:

Valid Values

-1 | 0 | x

where x is an integer from 1 to 128 that represents a number of bytes.

If set to -1, the driver uses the maximum packet size that the database server accepts.

If set to 0, the driver uses the default packet size configured on the database server.

If set to x, the driver uses a packet size that is calculated using the specified value multiplied by 512.

Example

If PacketSize=8, the packet size is set to 8 * 512 bytes (4096 bytes).

Default

-1

Data Type

int

Microsoft recommends (4096 bytes)

Deb · Answer

Assuming you just want to change that for specific DSN's, you should be able to specify the packet size in the connection string area.

You didn't mention what database server you're using, but you can find the parameters for SQL Server here: http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlconnection.connectionstring%28VS.71%29.aspx

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