Answer Posted / Sarfaraj Khan
Lookup transformations in Informatica use different caching strategies to improve performance. There are three main types of caches in a Lookup transformation:
1. Cache by RowID: This cache stores the input rows using their RowIDs, which speeds up subsequent lookups as the RowID can be used directly to find the corresponding value in the lookup table.
2. Cache by Key: In this cache type, the input keys are stored along with their corresponding values. It is useful for smaller lookup tables where the key-value pairs can fit into memory.
3. Dynamic Cache: The Dynamic Cache is a hybrid approach that combines both Cache by RowID and Cache by Key strategies. Initially, it uses Cache by RowID; when the cache size exceeds the configured limit, it switches to Cache by Key for the remaining entries.
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