Appendix B. DB_CONFIG Parameter Reference
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## Appendix B. DB_CONFIG Parameter Reference

The following `DB_CONFIG` parameters can be used to manage various aspects of your application's database environment. For information on your database environment, and how and where to set these parameters, see the DB_CONFIG File.

## DB_CONFIG Parameters

DB_CONFIG Parameters | Description
--- | ---
mutex_set_align | Sets the mutex alignment.
mutex_set_increment | Configures the number of additional mutexes to allocate.
mutex_set_max | Configures the total number of mutexes to allocate.
mutex_set_tas_spins | Specifies the number of times the test-and-set mutexes should spin without blocking.
rep_set_clockskew | Sets the clock skew ratio.
rep_set_config | Configures the Berkeley DB replication subsystem.
rep_set_limit | Sets record transmission throttling.
rep_set_nsites | Specifies the total number of sites in a replication group.
rep_set_priority | Specifies the database environment's priority.
rep_set_request | Sets a threshold before requesting retransmission of a missing message.
rep_set_timeout | Specifies a variety of replication timeout values.
repmgr_add_remote_site | Adds a new replication site to the list of known sites.
repmgr_set_ack_policy | Specifies how master and client sites will handle acknowledgment.
repmgr_set_local_site | Specifies the host identification string and port number.
set_cachesize | Sets the size of the shared memory buffer pool.
set_cache_max | Sets the maximum size for set_cachesize parameter.
set_create_dir | Sets the directory path to create the access method database files.
set_flags | Configures a database environment.
set_intermediate_dir_mode | Configures the directory permissions.
set_lg_bsize | Sets the size of the in-memory log buffer.
set_lg_dir | Sets the path of the directory for logging files.
set_lg_filemode | Sets the absolute file mode for created log files.
set_lg_max | Sets the maximum size of a single file in the log.
set_lg_regionmax | Sets the size of the underlying logging area.
set_lk_detect | Sets the maximum number of locking entities.
set_lk_max_lockers | Sets the maximum number of locking entities.
set_lk_max_locks | Sets the maximum number of locks supported by the Berkeley DB environment.
set_lk_max_objects | Sets the maximum number of locked objects.
set_lk_partitions | Sets the number of lock table partitions in the Berkeley DB environment.
log_set_config | Configures the Berkeley DB logging subsystem.
set_mp_max_openfd | Limits the number of file descriptors the library will open concurrently when flushing dirty pages from the cache.
set_mp_max_write | Limits the number of sequential write operations
set_mp_mmapsize | Sets the maximum file size.
set_open_flags | Initializes specific subsystems of the Berkeley DB environment.
set_shm_key | Configures the database environment's base segment ID.
set_thread_count | Declares an approximate number of threads in the database environment.
set_timeout | Sets timeout values for locks or transactions.
set_tmp_dir | Specifies the directory path of temporary files.
set_tx_max | Configures support of simultaneously active transactions.
set_verbose | Enables/disables the Berkeley DB message output.

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