Abinitio - What is driving port? When do you use it?

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What is driving port? When do you use it?

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Last Update: May 04, 2006 Asked by: rupal

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April 18, 2006 07:01:40

Dipti

RE: What is driving port? When do you use it?

When you set the sorted-input parameter of JOIN component to In memory: Input need not be sorted you can find the driving port.

Generally driving port use to improve performance in a graph.

The driving input is the largest input. All other inputs are read into memory.

For example suppose the largest input to be joined is on the in1 port. Specify a port number of 1 as the value of the driving parameter. The component reads all other inputs to the join for example in0 and in2 into memory.

Default is 0 which specifies that the driving input is on port in0.

Join also improves performance by loading all records from all inputs except the driving input into main memory.

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May 04, 2006 07:56:52

K Nagi Reddy

RE: What is driving port? When do you use it?

driving port in join supplies the data that drives join . That means for every record from the driving port it will be compared against the data from non driving port.

We have to set the driving port to the larger dataset sothat non driving data which is smaller can be kept in main memory for speedingup the operation.

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