Chapter 5. The DB_ENV Handle
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## Chapter 5. The DB_ENV Handle

The `DB_ENV` 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 `DB_ENV` handle are used to configure the environment as well as to operate on subsystems and databases in the environment.

`DB_ENV` handles are created using the db_env_create method, and are opened using the DB_ENV->open() method.

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

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