Why we use SQL override in Informatica?
SQL Override in Informatica We have an option to customize the default query provided by the transformations and enter custom SQL query by using SQL override. It then runs an SQL query against this view to push the transformation logic to the database.
How does Informatica improve session performance?
Complete the following tasks to improve session performance:
- Optimize the target.
- Optimize the source.
- Optimize the mapping.
- Optimize the transformation.
- Optimize the session.
- Optimize the grid deployments.
- Optimize the PowerCenter components.
- Optimize the system.
How can we improve throughput in Informatica?
Use filter transformation as early as possible inside the mapping. If the unwanted data can be discarded early in the mapping, it would increase the throughput. ‘ Use source qualifier to filter the data.
What is the difference between SQL override and lookup override in Informatica?
The role of SQL Override is to limit the number of incoming rows entering the mapping pipeline, whereas Lookup Override is used to limit the number of lookup rows to avoid the whole table scan by saving the lookup time and the cache it uses. Lookup Override provides only Non-Equi joins.
What is lookup SQL override in Informatica?
When a mapping includes a Lookup transformation, the. mapping. task queries the lookup object based on the fields and properties that you configure in the Lookup transformation. The.
How do I make my database faster?
Try these five tips to boost the speed of your database:
- Make sure all of your tables have primary keys. Running a table without a primary key is like running a four-cylinder engine with only two active pistons.
- Optimize by adding secondary indexes.
- Be like an atom and split.
- Use Compact and Repair.
- Load only what you need.
What is Informatica performance?
The goal of performance tuning is to optimize session performance by eliminating performance bottlenecks to get a better acceptable ETL load time. Tuning starts with the identification of bottlenecks in the source, target, and mapping and further to session tuning.
How increase DTM buffer size in Informatica?
To increase the DTM buffer size, open the session properties and click the Properties tab. Edit the DTM Buffer Size property in the Performance settings. Increase the DTM Buffer Size property by multiples of the buffer block size.
When to use SQL override in Informatica powercenter?
Many Informatica PowerCenter developers tend to use SQL Override during mapping development. Developers finds it easy and more productive to use SQL Override. At the same time ETL Architects do not like SQL Overrides as it hide the ETL logic from metadata manager.
Are there any transformations that support SQL override?
We have an option to customize the default query provided by the transformations and enter custom SQL query by using SQL override. The most common transformations which support the SQL overrides are Source Qualifier & Lookup transformations.
How to avoid performance issues with Informatica updates?
Informatica Updates Performance Issue A better way to apply updates only to a DBMS is to leave out the UPD completely; filter away all rows which should not be updated, set the Treat Source Rows As property of the session to Update, and that’s it. Again: don’t use UPDs if you can avoid them.
What happens when you override a SQL query?
When you override the default SQL query for a session configured for pushdown optimization, the Integration Service creates a view to represent the SQL override. It then runs an SQL query against this view to push the transformation logic to the database.
