Low Level API Changes
=====================

Below is the full list of API changes which a programmer upgrading from 4.2 -> 4.7 
would need to know about as noted in Chapter 31 in the Reference Guide: 

http://www.oracle.com/technology/documentation/berkeley-db/db/ref/toc.html

Functions:
 + Run time functions db_env_set_func_map/db_env_set_func_unmap replaced with 
   functions db_env_set_func_region_map/db_env_func_file_map.

Methods:
 + Base replication methods rep_elect, rep_get_nsites, rep_set_nsites, 
   rep_get_priority, rep_set_priority now take arguments of type u_int32_t rather than int.
 + DB Env method set_intermediate_dir replaced with set_intermediate_dir_mode.
 + Log Configuration method set_flags replaced with log_set_config.
 + The DBC handle methods have been renamed for consistency with the C++ and Java APIs.
   The change is the removal of the leading "C_" from the names, 
   ie: DBC->c_close changed to DBC->close.
 + DB_MPOOLFILE->put takes a new parameter: a page priority.
 + DB_MPOOLFILE->set has been removed.
 + The envid parameter to DB_ENV->rep_process_message has been changed to "int" rather than "int *"
 + The envid parameter to DB_ENV->rep_elect has been removed.
 + DB_REP_FULL_ELECTION flag specified to DB_ENV->repmgr_start has been removed.
 + Changes to default verbose message handling methods.
 + In replication the DB_REP_LOGSONLY flag to DB_ENV->rep_start replaced with DB_REP_CLIENT
 + New arguments nvotes, flags to DB_ENV->rep_elect.
 + New parameter passed to DB_ENV->set_errcall and DB->set_errcall.
 + Support for DB_ENV-set_verbose flag DB_VERB_CHKPOINT removed.
 + DB_ENV->set_msgcall/set_msgfile added to process message outputs.
 + For database environs using flag DB_TXN_NOTDURABLE replace with DB_LOG_INMEMORY.
 + DB_ENV->set_tas_spins/get_tas_spins renamed to DB_ENV->mutex_set_tas_spins/mutex_get_tas_spins
 + Flag DB_MUTEX_PROCESS_ONLY added to DB_ENV->set_isalive
 + Parameters priority & timeout no longer set via DB_ENV->rep_elect, use rep_set_priority & rep_set_timeout.
 + DB_ENV->set_rep_limit/get_rep_limit/set_rep_transport changed to rep_set_limit/rep_get_limit &
   rep_set_timeout
 + One of the informational returns from DB_ENV->rep_process_message changed to an event.
 + DB_MPOOL_DIRTY flag is now specified to the DB_MPOOLFILE->get method instead of the put method 
   and the set method has been removed. DB_MPOOL_CLEAN flag is no longer supported.