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What are the different lookup cache(s)?

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What are the different lookup cache(s)?

posted Feb 23, 2015 by Sachin

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1 Answer

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Informatica Lookups can be cached or un-cached (No cache).

And Cached lookup can be either static or dynamic.

A static cache:

It is one which does not modify the cache once it is built and it remains same during the session run.

A dynamic cache

It is refreshed during the session run by inserting or updating the records in cache based on the incoming source data. By default, Informatica cache is static cache.

A lookup cache can also be divided as persistent or non-persistent based on whether Informatica retains the cache even after the completion of session run or deletes it

answer Feb 24, 2015 by Manikandan J
Similar Questions
0 votes

can somebody explain to me when does the dynamic lookup cache file is updated?

is it when the lookup transform is done or when the row source to target path has ended?

+1 vote

Using Informatica 9.1.0

Scenario

Get the Dimension key generated and inserted to the Fact table from the Fact load.

I have to load the Fact table with a dimension key along with other columns. This dimension record is created from within the same mapping. There are five different sessions using the same mapping and executes simultaneously to load the Fact table. In this case I'm using a dynamic lookup with 'Synchronize dynamic cache' enabled to get unique dimension records generated from the 5 sessions using some conditions. The dimension ID is generated using the Sequence-ID in associated expression of the lookup. When a single session alone is run it worked perfectly fine. But when the sessions were run parallely it started to show unique key violation error as random sessions tried to insert the same sequence which was already there.

To fix the issue I had to give persistent lookup cache enabled and Cache file name prefix. But I did not find this solution or this issue in any of the forums or in INFA communities. So not sure this is the right way of doing it or this is a bug of some kind.

Please let me know if you had similar issue or some different thoughts.

Thanks in advance

+3 votes

Using Informatica 9.1.0

Scenario

Get the Dimension key generated and inserted to the Fact table from the Fact load.

I have to load the Fact table with a dimension key along with other columns. This dimension record is created from within the same mapping. There are five different sessions using the same mapping and executes simultaneously to load the Fact table. In this case I'm using a dynamic lookup with 'Synchronize dynamic cache' enabled to get unique dimension records generated from the 5 sessions using some conditions. The dimension ID is generated using the Sequence-ID in associated expression of the lookup. When a single session alone is run it worked perfectly fine. But when the sessions were run parallely it started to show unique key violation error as random sessions tried to insert the same sequence which was already there.

To fix the issue I had to give persistent lookup cache enabled and Cache file name prefix. But I did not find this solution or this issue in any of the forums or in INFA communities. So not sure this is the right way of doing it or this is a bug of some kind.

Please let me know if you had similar issue or some different thoughts.

Thanks in advance

+1 vote

What are the differences between Connected and Unconnected Lookup?

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