Skip to main content

Update Strategy for Deleting Records in Informatica

Scenario:

I am using an update strategy transformation for deleting records from my target table. In my Warehouse Designer, I have defined one column (say col1) as Primary Key and another column (say col2) as Primary/Foreign Key.

My target has rows like this:

Col1 Col2 Col3
----
1 A value1
2 A value2
3 B value3

I want to delete the record from the target which has the combination (Col1="2" and Col2="A"). Will linking the fields Col1 and Col2 from the Update Strategy transformation to the Target serve the purpose?

Solution:

Define both the columns as primary key in target definition and link only col1 and col2 in mapping. This will serve your purpose.

BTW, if you do only delete then update strategy is not required at all.

Comments

Post a Comment

Popular posts from this blog

SQL Transformation with examples

============================================================================================= SQL Transformation with examples   Use : SQL Transformation is a connected transformation used to process SQL queries in the midstream of a pipeline . We can insert, update, delete and retrieve rows from the database at run time using the SQL transformation. Use SQL transformation in script mode to run DDL (data definition language) statements like creating or dropping the tables. The following SQL statements can be used in the SQL transformation. Data Definition Statements (CREATE, ALTER, DROP, TRUNCATE, RENAME) DATA MANIPULATION statements (INSERT, UPDATE, DELETE, MERGE) DATA Retrieval Statement (SELECT) DATA Control Language Statements (GRANT, REVOKE) Transaction Control Statements (COMMIT, ROLLBACK) Scenario: Let’s say we want to create a temporary table in mapping while workflow is running for some intermediate calculation. We can use SQL transformat...
1 comment
Read more

CMN_1650 A duplicate row was attempted to be inserted into a dynamic lookup cache Dynamic lookup error.

Scenario: I have 2 ports going through a dynamic lookup, and then to a router. In the router it is a simple case of inserting new target rows (NewRowLookup=1) or rejecting existing rows (NewRowLookup=0). However, when I run the session I'm getting the error: "CMN_1650 A duplicate row was attempted to be inserted into a dynamic lookup cache Dynamic lookup error. The dynamic lookup cache only supports unique condition keys." I thought that I was bringing through duplicate values so I put a distinct on the SQ. There is also a not null filter on both ports. However, whilst investigating the initial error that is logged for a specific pair of values from the source, there is only 1 set of them (no duplicates). The pair exists on the target so surely should just return from the dynamic lookup newrowlookup=0. Is this some kind of persistent data in the cache that is causing this to think that it is duplicate data? I haven't got the persistent cache or...
Post a Comment
Read more

PL/SQL Interview Questions

1.     What is PL/SQL ? PL/SQL is Oracle's Procedural Language extension to SQL. PL/SQL's language syntax, structure and datatypes are similar to that of ADA. The language includes object oriented programming techniques such as encapsulation, function overloading, information hiding (all but inheritance), and so, brings state-of-the-art programming to the Oracle database server and a variety of Oracle tools.   PL SQL is a block structured programming language. It combines data manipulation & data processing power. It supports all SQL data types. Also has its own data types i,e BOOLEAN,BINARY INTEGER 2.    What is the basic structure of PL/SQL ? A PL /SQL block has three parts: a declarative part, an executable part, and an exception-handling part. First comes the declarative part, in which items can be declared. Once declared, items can be manipulated in the executable part. Ex...
6 comments
Read more