 If its suffix is ".tcb", the database will be
 a B+ tree database.  If its suffix is ".tcf", the database will be a fixed-length database.
 If its suffix is ".tct", the database will be a table database.  Otherwise, this method
 fails.  Tuning parameters can trail the name, separated by "#".  Each parameter is composed
 of the name and the value, separated by "=".  On-memory hash database supports "bnum",
 "capnum", and "capsiz".  On-memory tree database supports "capnum" and "capsiz".  Hash
 database supp