Appendix D. DB_CONFIG Parameter Reference
The following DB_CONFIG parameters can be used to manage various aspects of your application's database environment.
DB_CONFIG Parameters
| DB_CONFIG Parameters | Description |
|---|---|
| add_data_dir | Sets the mutex alignment. |
| 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_set_ack_policy | Specifies how master and client sites will handle acknowledgment. |
| repmgr_site | Identifies a Replication Manager host. |
| 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_data_len | Sets the maximum number of bytes displayed by some utilities. |
| 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. |