What is Nextval and Currval in sequence generator?
The NEXTVAL port generates the sequence numbers base on the Current Value and Increment By properties. Another option is create sequence generator transformation for each target. CURRVAL Port: The CURRVAL is the NEXTVAL plus the Increment By value. You rarely connect the CURRVAL port to other transformations.
What is the use of sequence generator in Informatica?
The sequence generator is used to generate primary key values & it’s used to generate numeric sequence values like 1, 2, 3, 4, 5 etc. For example, you want to assign sequence values to the source records, then you can use sequence generator.
What is Nextval?
The Oracle NEXTVAL function is used to retrieve the next value in a sequence. The Oracle NEXTVAL function must be called before calling the CURRVAL function, or an error will be thrown.
Is negative increment possible in sequence generator?
INCREMENT BY Specify the interval between sequence numbers. This integer value can be any positive or negative integer, but it cannot be 0.
How to generate a sequence generator in Informatica?
From the above screenshot, you can observe that Sequence Generator transformation generates two default items NEXTVAL and CURRVAL. NEXTVAL port is the one we have to assign for the Employee_ID and we have to assign the CURRVAL inside the transformation editor. Double click on the Sequence Generator transformation to generate the sequential numbers.
How does currval work in a sequence generator?
It contains two output ports that you can connect to one or more transformations. The Integration Service generates a block of sequence numbers each time a block of rows enters a connected transformation. If you connect CURRVAL, the Integration Service processes one row in each block.
How to generate sequential numbers in sequence generator?
Double click on the Sequence Generator transformation to generate the sequential numbers. From the below screenshot you can see the list of available properties in the Transformation tab: Select Transformation: By default, it will select the transformation you clicked on.
How is the sequence generator connected to the integration service?
The Sequence Generator transformation is a connected transformation. It contains two output ports that you can connect to one or more transformations. The Integration Service generates a block of sequence numbers each time a block of rows enters a connected transformation. If you connect CURRVAL, the Integration Service