Create multiple dbm files

Hi, there,
I have three bigs flat files: FileA (1919844000 bytes), FileB
(2019607829 bytes) and FileC(342115633 bytes). I need to use FileB and
FileC as lookup table to update FileA. My plan is to read FileB and
FileA in and use hash (tied hash) to create DBM files and then update
the FileA. However, I got this error message "ndbm store returned -1,
errno 0" when the dat.pag hits 33829941248 bytes. I guess it is because
the size is too big?
How can I creat two or even three dbm files while reading the flat data
and use only one hash? In other words, let the multiple dbms be
transparent to the hash.
BTW, "AnyDBM_File" is the only module available related to the DBM.
thanks a lot.
Pablo

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