little performance overhead, e.g. you can use all transaction and/or replication functionality of Berkeley DB.

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        <p>
dbstl container/iterator class templates reside in header files dbstl_vector.h, dbstl_map.h and dbstl_set.h.

Among them, dbstl_vector.h contains dbstl::db_vector and its iterators;
dbstl_map.h contains dbstl::db_map, dbstl::db_multimap and their iterators; dbstl_set.h contains dbstl::db_set and dbstl::db_multiset and their iterators. You should
include needed header file(s) to us