In f16+updates-testing these can be installed side by side: db4-4.8.30-3.fc15.i686 libdb-5.2.28-2.fc16.i686 But debuginfo-install db4 libdb gives file /usr/lib/debug/usr/lib/libdb.so.debug conflicts between attempted installs of libdb-debuginfo-5.2.28-2.fc16.i686 and db4-debuginfo-4.8.30-3.fc15.i686 file /usr/lib/debug/usr/lib/libdb_cxx.so.debug conflicts between attempted installs of libdb-debuginfo-5.2.28-2.fc16.i686 and db4-debuginfo-4.8.30-3.fc15.i686 file /usr/lib/debug/usr/lib/libdb_java.so.debug conflicts between attempted installs of libdb-debuginfo-5.2.28-2.fc16.i686 and db4-debuginfo-4.8.30-3.fc15.i686 - and that will for example prevent getting full debug symbols for Python I guess db4 is a kind of -compat package and should move out of the primary namespace?
*** This bug has been marked as a duplicate of bug 739639 ***