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Recent Questions

  • Which transformation should we use to normalize the COBOL and relational sources? view answer
  • Difference between static cache and dynamic cache? view answer
  • What are the join types in joiner transformation? view answer
  • In which condtions we can not use joiner transformation(Limitaions of joiner transformation)? view answer
  • What is the look up transformation? view answer
  • What are the diffrence between joiner transformation and source qualifier transformation? view answer
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  • How can you improve session performance in aggregator transformation? view answer
  • Can you use the maping parameters or variables created in one maping into any other reusable transformation? view answer
  • What is meant by lookup caches? view answer
  • What is source qualifier transformation? view answer
  • How the informatica server increases the session performance through partitioning the source? view answer
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  • Without using ETL tool can u prepare a Data Warehouse and maintain? view answer
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  • Name some measures in your fact table? view answer
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  • If u r source is flat file with delimited operator.when next time u want change that delimited operator where u can make? view answer
  • If index cache file capacity is 2MB and datacache is 1 MB. If you enter the data of capacity for index is 3 MB and data is 2 MB. What will happen? view answer
  • Difference between next value and current value ports in sequence generator? view answer
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  • If you are using aggregator transformation in your mapping at that time your source contain dimension or fact? view answer
  • My input is oracle and my target is flat file shall I load it? How? view answer
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  • What is the difference between connected lookup and unconnected lookup? view answer
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  • I have the Administer Repository Privilege, but I cannot access a repository using the Repository Manager. view answer
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  • I do not want a user group to create or edit sessions and batches, but I need them to access the Server Manager to stop the Informatica Server. view answer
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  • What are different kinds of repository objects? And what it will contain? view answer
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  • What are the new features and enhancements in PowerCenter 5.1? view answer
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  • Which ETL tool is more preferable Informatica or Data Stage and why? view answer
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  • How do we create primary key only on odd numbers? view answer
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  • 1. What is a Data warehouse? view answer

!!! Informatica Frequently Asked Questions !!!

What is meant by lookup caches?

SCJP 1.5/1.6 Exam Kit

!!!Answer!!!- From Technical Expert

Session will read all unique rows from the reference table/ file to fill the local buffer first; then for each row received from up-stream transformation, it tries to match them against the local buffer

Informatica server builts a cache in memory when it process the first row of a cached lookup transformation. alidwh@gmail.com

- When server runs a lookup transformation, the server builds a cache in memory, when it process the first row of data in the transformation. - Server builds the cache and queries it for the each row that enters the transformation. - The server creates index and data cache files in the lookup cache drectory and used the server code page to create the files. - index cache contains conductional values and data cache contains output values

The informatica server builds a cache in memory when it processes the first row of a data in a cached look up transformation. It allocates memory for the cache based on the amount you configure in the transformation or session properties. The informatica server stores condition values in the index cache and output values in the data cache.

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