The LOOKUP FILE component represents a particular set of lookup data and associates it with a search key and a DML record format.
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When to use a LOOKUP FILE
You use a LOOKUP FILE component instead of an INPUT FILE component when your graph needs to access a dataset repeatedly. Retrieving records from main memory is much quicker than retrieving them from disk, so LOOKUP FILE can make graph processing quicker and more efficient. However, you have to make sure that the amount of data associated with the LOOKUP FILE is small enough to be held in main memory.
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