what are conditional statements in aggregator transformation?

The conditional statements are the statements that we can include in the aggregate function itself.

While performing aggregate calculations.

EX:-

Sum (IIF(dept=’HR’,salary,0))   

here if dept is HR only will do SUM.

When cache files deleted for incremental aggregation what happens? 

When cache files not available in informatica server, then session won't fail, it will recreate the cache automatically. But it takes more time compared to normal run, reason is recreation of cache takes some time.

Can we select both sorted input and incremental aggregation at a time? 
No, we can't select. Reason is if you select sorted input it performs calculations in memory. When you select incremental aggregation it performs calculations on existing cache values.

Thanks 

Hari Babu

What are the output files that the Informatica server creates during the session running?

Informatica server log: Informatica server (on UNIX) creates a log for all status and error messages (default name: pm.server.log). It also creates an error log for error messages. These files will be created in Informatica home directory.

Session log file: Informatica server creates session log file for each session. It writes information about session into log files such as initialization process, creation of sql commands for reader and writer threads, errors encountered and load summary. The amount of detail in session log file depends on the tracing level that you set.

Session detail file: This file contains load statistics for each target in mapping. Session detail includes information such as table name, number of rows written or rejected. You can view this file by double clicking on the session in monitor window.

Performance detail file: This file contains information known as session performance details which helps you where performance can be improved. To generate this file select the performance detail option in the session property sheet.

Reject file: This file contains the rows of data that the writer does not write to targets.

Control file: Informatica server creates control file and a target file when you run a session that uses the external loader. The control file contains the information about the target flat file such as data format and loading instructions for the external loader.

Post session email: Post session email allows you to automatically communicate information about a session run to designated recipients. You can create two different messages. One if the session completed successfully the other if the session fails.

Indicator file: If u use the flat file as a target, you can configure the informatica server to create indicator file. For each target row, the indicator file contains a number to indicate whether the row was marked for insert,update,delete or reject.

Output file: If session writes to a target file, the informatica server creates the target file based on file properties entered in the session property sheet.

Cache files: When the informatica server creates memory cache it also creates cache files. For the following circumstances informatica server creates index and datacache files.

Aggregator transformation

Joiner transformation

Rank transformation

Lookup transformation

Regards,

Hari Babu