AnyDBM_File will use its preference for a dbm. It will always find something though because it can fall back on SDBM_File which ships with Perl.

However if keys or values go over 2K, that will cause data corruption. So don't use SDBM_File if you can avoid it.

Also note that if you are using one dbm and then install another, AnyDBM_File will no longer know how to read any of the data files that you previously worked with. Caveat programmer.