What is sequential file stage in DataStage?

What is sequential file stage in DataStage?

The Sequential File stage is a file stage that allows you to read data from or write data one or more flat files. The stage can have a single input link or a single output link, and a single rejects link.

What is lookup fileset DataStage?

The Lookup File Set stage is a file stage that allows you to create a lookup file set or reference one for a lookup. When performing lookups, Lookup File Set stages are used with Lookup stages. The Lookup File Set stage is a file stage. It allows you to create a lookup file set or reference one for a lookup.

How do you handle null values in sequential file in DataStage?

Parallel Job:

1. Create a Sequential file stage and make sure there is an Output link from it.
2. Open the Sequential file stage and click the “Outputs” tab ans Select “Format”
3. Right click on “Field defaults” ==> “Add sub-property” and select “Null field value”
4. Enter the “~” in the newly created field.

What is reference link in DataStage?

A reference link represents a table lookup operation. You can use a reference link as an input link to a Lookup stage and as an output link from other types of stages, such as the Db2 Connector stage.

What is the difference between dataset and fileset in DataStage?

The File Set stage enables you to create and write to file sets, and to read data back from file sets. Unlike data sets, file sets carry formatting information that describe the format of the files to be read or written.

What is dataset in DataStage?

The Data Set stage is a file stage that allows you to read data from or write data to a data set. The Data Set stage is a file stage. The Data Set stage allows you to store data being operated on in a persistent form, which can then be used by other InfoSphere® DataStage® jobs.

How do you trim a space in Datastage?

Use the TRIM function to remove unwanted characters in expression. If only expression is specified, multiple occurrences of spaces and tabs are reduced to a single tab or space, and all leading and trailing spaces and tabs are removed.

IS NULL function in Datastage?

Description. Use the ISNULL function to test whether a variable is the null value. If variable is the null value, 1 (true) is returned, otherwise 0 (false) is returned. This is the only way to test for the null value since the null value is not equal to any value, including itself.

How many input links can you give to a transformer stage?

Transformer stages can have a single input and any number of outputs. It can also have a reject link that takes any rows which have not been written to any of the outputs links by reason of a write failure or expression evaluation failure.

How do you create a link in Datastage?

Adding links

1. Right-click on the Sequential File stage on the left of your job and hold the right button down.
2. Drag the target to the Transformer stage and release the mouse button.
3. Repeat steps 1 and 2 to connect the Transformer stage to the second Sequential File stage.
4. Select File > Save to save the job.

What do you mean by sequential file stage?

The Sequential File stage is a file stage that allows you to read data from or write data one or more flat files. The stage can have a single input link or a single output link, and a single rejects link. When you edit a Sequential File stage, the Sequential File stage editor appears.

When does the sequentional stage execute in parallel mode?

The stage executes in parallel mode by default if reading multiple files but executes sequentially if it is only reading one file. In order read a sequential file datastage needs to know about the format of the file. Read Method: Whether to specify filenames explicitly or use a file pattern.

When to use sequential file stage in Infosphere?

The stage executes in parallel if writing to multiple files, but executes sequentially if writing to a single file. Each node writes to a single file, but a node can write more than one file. When reading or writing a flat file, InfoSphere® DataStage® needs to know something about the format of the file.

Do you need a schema file in DataStage?

We have moved to www.dataGenX.net, Keep Learning with us. In Datastage, Schemas are an alternative way for you to specify column definitions for the data used by parallel jobs. You do not need to define any column and data format for reading a file.