What is Tail Stage? || Tutorial || Practice Bits || Real Time Scenario’s

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What is Tail Stage in IBM Info Sphere Data stage ?

What is Tail Stage?

What is Tail Stage in Development and Debug Stage ?

Tail Stage:

1.The Tail Stage is a Development/Debug stage

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

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

Ø  The number of records to copy

Ø  The partition from which the records are copied

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

Tail stage properties:

1.Rows

2.Partitions

Rows:

Ø  No of rows[Per partition]=10(Default is 10 if we need more than 10 or less than 10  we have to change the number)

                  Number of rows to copy from input to output per partition.

      Partitions:

      All Partition=True/False

      When set to True copies rows from all partitions. When set to False, copies from  

      specific partition numbers, which must be specified.

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