Chapter 5. The DbEnv Handle
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## Chapter 5. The DbEnv Handle

The `DbEnv` object is the handle for a Berkeley DB environment — a collection including support for some or all of caching, locking, logging and transaction subsystems, as well as databases and log files. Methods of the `DbEnv` handle are used to configure the environment as well as to operate on subsystems and databases in the environment.

`DbEnv` handles are opened using the DbEnv::open() method.

When you are done using your environment, close it using the DbEnv::close() method. Before closing your environment, make sure all open database handles are closed first. See the Db::close() method for more information.

## Database Environments and Related Methods

Database Environment Operations | Description
--- | ---
Db::get_env() | Return the Db's underlying DbEnv handle
DbEnv::close() | Close an environment
DbEnv | Create an environment handle
DbEnv::dbremove() | Remove a database
DbEnv::dbrename() | Rename a database
DbEnv::err() | Error message
DbEnv::failchk() | Check for thread failure
DbEnv::fileid_reset() | Reset database file IDs
DbEnv::get_home() | Return environment's home directory
DbEnv::get_open_flags() | Return flags with which the environment was opened
DbEnv::lsn_reset() | Reset database file LSNs
DbEnv::open() | Open an environment
DbEnv::remove() | Remove an environment
DbEnv::stat_print() | Environment statistics
DbEnv::strerror() | Error strings
DbEnv::version() | Return version information
Environment Configuration
DbEnv::add_data_dir() | add an environment data directory
DbEnv::set_alloc() | Set local space allocation functions
DbEnv::set_app_dispatch() | Configure application recovery callback
DbEnv::set_data_dir(), DbEnv::get_data_dirs() | Set/get the environment data directory
DbEnv::set_create_dir(), DbEnv::get_create_dir() | add an environment data directory
DbEnv::set_encrypt(), DbEnv::get_encrypt_flags() | Set/get the environment cryptographic key
DbEnv::set_event_notify() | Set event notification callback
DbEnv::set_errcall() | Set error message callbacks
DbEnv::set_errfile(), DbEnv::get_errfile() | Set/get error message FILE
DbEnv::set_error_stream() | Set C++ ostream used for error messages
DbEnv::set_errpfx(), DbEnv::get_errpfx() | Set/get error message prefix
DbEnv::set_feedback() | Set feedback callback
DbEnv::set_flags(), DbEnv::get_flags() | Environment configuration
DbEnv::set_intermediate_dir_mode(), DbEnv::get_intermediate_dir_mode() | Set/get intermediate directory creation mode
DbEnv::set_isalive() | Set thread is-alive callback
DbEnv::set_message_stream() | Set C++ ostream used for informational messages
DbEnv::set_msgcall() | Set informational message callback
DbEnv::set_msgfile(), DbEnv::get_msgfile() | Set/get informational message FILE
DbEnv::set_shm_key(), DbEnv::get_shm_key() | Set/get system memory shared segment ID
DbEnv::set_thread_count(), DbEnv::get_thread_count() | Set/get approximate thread count
DbEnv::set_thread_id() | Set thread of control ID function
DbEnv::set_thread_id_string() | Set thread of control ID format function
DbEnv::set_timeout(), DbEnv::get_timeout() | Set/get lock and transaction timeout
DbEnv::set_tmp_dir(), DbEnv::get_tmp_dir() | Set/get the environment temporary file directory
DbEnv::set_verbose(), DbEnv::get_verbose() | Set/get verbose messages
DbEnv::set_cachesize(), DbEnv::get_cachesize() | Set/get the environment cache size

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