What are different types of partitioning in Informatica?
You can define the following partition types in the Workflow Manager:
- Database partitioning. The PowerCenter Integration Service queries the IBM DB2 or Oracle system for table partition information.
- Hash partitioning.
- Key range.
- Pass-through.
- Round-robin.
How do I partition in Informatica?
You can configure partitions for non-reusable sessions in the Workflow Designer and for reusable sessions in the Task Developer. Add, delete, or edit partition points on the Partitions view of session properties. If you add a key range partition point, you can define the keys in each range.
What is the default partitioning in Informatica?
The PowerCenter Integration Services creates a default partition type at each partition point. If we have the Partitioning option, we can change the partition type. The partition type controls how the PowerCenter Integration Service distributes data among partitions at partition points.
Which partition is suggested when reading flat files sources of different sizes?
Mapplet Input.
What is dynamic partitioning in Informatica?
If the volume of data grows or you add more CPUs, you might need to adjust partitioning so the session run time does not increase. When you use dynamic partitioning, you can configure the partition information so the Integration Service determines the number of partitions to create at run time.
What is parallel partitioning in Informatica?
The Informatica PowerCenter Partitioning Option increases the performance of PowerCenter through parallel data processing. Partitioning option will let you split the large data set into smaller subsets which can be processed in parallel to get a better session performance.
What are the main issues while working with flat files as source and as targets?
(i) Your data file may be fixed width, but the definition is delimited—-> truncated data (ii) Your data file as well as definition is delimited but specifying a wrong delimiter (a) a delimitor other than present in actual file or (b) a delimiter that comes as a character in some field of the file—>wrong data again …
What is hash auto key partitioning Informatica?
Hash auto-keys partitioning groups rows with the same values into the same partition based on the partition key. After grouping the rows, the Integration Service passes the rows through the Sorter transformation.
Why do you partition data?
Partitioning can improve scalability, reduce contention, and optimize performance. It can also provide a mechanism for dividing data by usage pattern. For example, you can archive older data in cheaper data storage.
How flat file compare to database?
You can load flat file into rdbms using sql*loader , and compare 2 oracle tables. If you cant load into database, take sample 5 records from flat file and table ,and compare to validate data. if records count is less , export database table into xls file (you can do it using toad) and compare 2 .
What is pipeline partitioning in Informatica?
A partition is a pipeline stage that executes in a single reader, transformation, or writer thread. The number of partitions in any pipeline stage equals the number of threads in the stage. By default, the Integration Service creates one partition in every pipeline stage.
How do partitions work?
Partitions enable users to divide a physical disk into logical sections. For example, allowing multiple operating systems to run on the same device. With older file allocation tables, such as FAT 16, creating smaller partitions allows a computer hard drive to run more efficiently and save more disk space.
What is round robin partitioning?
Round-robin partitioning is used to achieve an equal distribution of rows to partitions. However, unlike hash partitioning, you do not have to specify partitioning columns. With round-robin partitioning, new rows are assigned to partitions on a rotation basis. The table must not have primary keys.