What is cache and Uncached lookup in Informatica?

What is cache and Uncached lookup in Informatica?

If the lookup is cache(By default static cache) Informatica server builds the cache when it processes the first lookup request .But when it is. uncached lookup it queries the lookup source(direct to the Database) instead of building and querying the cache.

What is lookup cache in Informatica?

When a lookup is cached: Informatica queries the database, brings the whole set of rows to the Informatica server and stores in a cache file. When this lookup is called next time, Informatica uses the file cached. As a result, Informatica saves the time and the resources to hit the database again.

What are the types of lookup caches in Informatica?

Types of Lookup Caches in Informatica

• Static cache: Static Cache is same as a Cached Lookup in which once a Cache is created and the Integration Service always queries the Cache instead of the Lookup Table.
• Dynamic cache:
• Shared cache:
• Persistent cache:
• Re-cache from database.

How dynamic lookup cache works in Informatica?

If the task uses the cache multiple times, the task uses the same data. If the cache is dynamic, the task updates the cache based on the actions in the task, so if the task uses the lookup multiple times, downstream transformations can use updated data.

What is persistent cache?

The Integration Framework uses a separate SQL repository to track integration information. This SQL repository is referred to as the persistent cache or the Integration Data repository. This property tracks whether the item in the local repository is up to date with the data in the remote system.

What is static and dynamic cache in Informatica?

Static Cache gets created once and reused through out the session. Dynamic Cache gets created initially and then data keep inserted/updated during the session. Dynamic cache option is useful when lookup table and target table are same and you have need to update data in cache.

What are the types of lookups?

There are two forms of Lookup: Vector and Array. The vector form of the LOOKUP function will search one row or one column of data for a specified value and then get the data from the same position in another row or column.

What are the different types of caches?

There is three types of cache:

• direct-mapped cache;
• fully associative cache;
• N-way-set-associative cache.

What’s the difference between dynamic cache and static cache?

You might want to use dynamic cache instead of a static cache if the source might contain duplicate private keys. The cache does not change during the task run. The task inserts or updates rows in the cache as it passes rows to the target.

How many levels of cache are there?

Cache is graded as Level 1 (L1), Level 2 (L2) and Level 3 (L3): L1 is usually part of the CPU chip itself and is both the smallest and the fastest to access. Its size is often restricted to between 8 KB and 64 KB.