INTERVIEW QUESTIONS DATA WAREHOUSING INFORMATICA DETAILS

Question: Performance tuning in Informatica?

Answer: The goal of performance tuning is optimize session performance so sessions run during the available load window for the Informatica Server.Increase the session
performance by following.
The performance of the Informatica Server is related to network connections. Data generally moves across a network at less than 1 MB per second, whereas a local disk
moves data five to twenty times faster. Thus network connections ofteny affect on session performance.So aviod netwrok connections.
Flat files: If u’r flat files stored on a machine other than the informatca server, move those files to the machine that consists of informatica server.
Relational datasources: Minimize the connections to sources ,targets and informatica server to
improve session performance.Moving target database into server system may improve session
performance.
Staging areas: If u use staging areas u force informatica server to perform multiple datapasses.
Removing of staging areas may improve session performance.
You can run the multiple informatica servers againist the same repository.Distibuting the session load to multiple informatica servers may improve session performance.
Run the informatica server in ASCII datamovement mode improves the session performance.Because ASCII datamovement mode stores a character value in one
byte.Unicode mode takes 2 bytes to store a character.
If a session joins multiple source tables in one Source Qualifier, optimizing the query may improve performance. Also, single table select statements with an ORDER BY or
GROUP BY clause may benefit from optimization such as adding indexes.
We can improve the session performance by configuring the network packet size,which allows
data to cross the network at one time.To do this go to server manger ,choose server configure database connections.
If u are target consists key constraints and indexes u slow the loading of data.To improve the session performance in this case drop constraints and indexes before u run the
session and rebuild them after completion of session.
Running a parallel sessions by using concurrent batches will also reduce the time of loading the
data.So concurent batches may also increase the session performance.
Partittionig the session improves the session performance by creating multiple connections to sources and targets and loads data in paralel pipe lines.
In some cases if a session contains a aggregator transformation ,You can use incremental aggregation to improve session performance.
Aviod transformation errors to improve the session performance.
If the sessioin containd lookup transformation You can improve the session performance by enabling the look up cache.
If U’r session contains filter transformation ,create that filter transformation nearer to the sources
or You can use filter condition in source qualifier.
Aggreagator,Rank and joiner transformation may oftenly decrease the session performance .Because they must group data before processing it.To improve session
performance in this case use sorted ports option.

The goal of performance tuning is optimize session performance so sessions run during the available load window for the Informatica Server.Increase the session
performance by following.
The performance of the Informatica Server is related to network connections. Data generally moves across a network at less than 1 MB per second, whereas a local disk
moves data five to twenty times faster. Thus network connections ofteny affect on session performance.So aviod netwrok connections.
Flat files: If u’r flat files stored on a machine other than the informatca server, move those files to the machine that consists of informatica server.
Relational datasources: Minimize the connections to sources ,targets and informatica server to
improve session performance.Moving target database into server system may improve session
performance.
Staging areas: If u use staging areas u force informatica server to perform multiple datapasses.
Removing of staging areas may improve session performance.
You can run the multiple informatica servers againist the same repository.Distibuting the session load to multiple informatica servers may improve session performance.
Run the informatica server in ASCII datamovement mode improves the session performance.Because ASCII datamovement mode stores a character value in one
byte.Unicode mode takes 2 bytes to store a character.
If a session joins multiple source tables in one Source Qualifier, optimizing the query may improve performance. Also, single table select statements with an ORDER BY or
GROUP BY clause may benefit from optimization such as adding indexes.
We can improve the session performance by configuring the network packet size,which allows
data to cross the network at one time.To do this go to server manger ,choose server configure database connections.
If u are target consists key constraints and indexes u slow the loading of data.To improve the session performance in this case drop constraints and indexes before u run the
session and rebuild them after completion of session.
Running a parallel sessions by using concurrent batches will also reduce the time of loading the
data.So concurent batches may also increase the session performance.
Partittionig the session improves the session performance by creating multiple connections to sources and targets and loads data in paralel pipe lines.
In some cases if a session contains a aggregator transformation ,You can use incremental aggregation to improve session performance.
Aviod transformation errors to improve the session performance.
If the sessioin containd lookup transformation You can improve the session performance by enabling the look up cache.
If U’r session contains filter transformation ,create that filter transformation nearer to the sources
or You can use filter condition in source qualifier.
Aggreagator,Rank and joiner transformation may oftenly decrease the session performance .Because they must group data before processing it.To improve session
performance in this case use sorted ports option. Source: CoolInterview.com

Increase the temporary database space also improves the performance. Source: CoolInterview.com

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