The multiple-record data map indicates that the specified record is marked as a file header. This record type occurs only at the start of a multiple-record file, before other record types. After PowerExchange writes all file header records to cache, it blocks the cache release algorithm. The cache is not released until PowerExchange writes all of the records in the file to cache.
Because PowerExchange caches all records in a file for a multiple-record write operation, the cache can use a large amount of memory. In this case, data overflows to disk can occur.
If the output file is small enough to fit in cache memory and on disk, ignore this message. If the output file is large and would use an excessive amount of cache, consider pre-processing the file header records to write them to a separate file. Process all of the other record types in the main workflow. Then merge the files.
If you need assistance, contact Informatica Global Customer Support.