What does Lookup do in Datastage?

The Lookup stage is a processing stage that is used to perform lookup operations on a data set read into memory from any other Parallel job stage that can output data.

What are the two types of Lookup in Datastage?

There are two types of Lookups in Datastage i.e. Normal lkp and Sparse lkp.

What is a Lookup file?

A Lookup file is a two-dimensional table of data that has been stored in a disk file. A name and display format for each column of data may also be stored, depending on the file format.

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. It allows you to read data from or write data to a data set. The stage can have a single input link or a single output link.

Why do we need lookup table?

Lookup tables are also used extensively to validate input values by matching against a list of valid (or invalid) items in an array and, in some programming languages, may include pointer functions (or offsets to labels) to process the matching input.

Where are DataStage datasets stored?

Primarily, persistent Datasets are being stored in Unix files using internal Datastage EE format, while virtual Datasets are never stored on disk – they do exist within links, and in EE format, but in RAM memory.

What is DataSet and sequential file?

Dataset: It stores data in the ASCII format so it takes less time to read data for datastage. IT can accommodate large amount of data. Sequential file stage: It contains data in the readable format, it can accommodate only 2GB data. It doesn’t support null value, also we can capture the reject data in seq file stage.

What is the difference between lookup and Vlookup?

The LOOKUP function allows a user to search for a piece of data in a row or column and return a corresponding piece of data in another row or column. The VLOOKUP function is similar but only allows a user to search vertically in a row and only returns data in a left-to-right procedure.

What is the difference of Vlookup and lookup function?

The main difference between VLOOKUP and LOOKUP functions is the VLOOKUP is limited to vertical lookups only and the LOOKUP function has cross functionality which means that it can perform both vertical lookups and horizontal lookups.