What is Head Stage in IBM Info Sphere Data Stage Tutorial || Practice Bits || Real Time Scenario’s

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What is Head Stage in IBM Info Sphere Data stage ?

What is Head Stage?

What is Head Stage in Development and Debug Stage?

Head Stage:

1. The Head Stage is a Development/Debug stage

2. It can have a single input link and a single output link

3. The Head Stage selects the first N rows from each partition of an input data set and copies the selected rows to an output data set. You determine which rows are copied by setting properties which allow you to specify:

Ø  The number of rows to copy

Ø  The partition from which the rows are copied

Ø  The location of the rows to copy

Ø  The number of rows to skip before the copying operation begins

4.This stage is helpful in testing and debugging applications with large data sets. For example, the Partition property lets you see data from a single partition to determine if the data is being partitioned as you want it to be. The Skip property lets you access a certain portion of a data set.

The stage editor has three pages:

Stage Page. This is always present and is used to specify general information about the stage.

Input Page. This is where you specify the details about the single input set from which you are selecting records.

Output Page. This is where you specify details about the processed data being output from the stage.

Head stage properties:

1. Rows

Ø  All Rows[After Skip]=True/False

Copy all rows to the output following any requested skip positioing

Ø  All Rows[After Skip]=False

     No of rows [Per partition]=10 

                 Period[Per Partition]=N

Copy every N'th row per partition, starting with the first.

                Skip[Per Partition]=1

Number of rows to skip at the start of every partition.

If we select false then only No of rows [Per partition]=10  will come

2. Partitions

Ø  All  Partition=True

When set to True copies rows from all partitions. When set to False, copies from specific partition numbers, this must be specified.

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