Berkeley DB: DB_ENV->set_lk_max_lockers
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DB_ENV->set_lk_max_lockers |

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    #include <db.h>

    int
    DB_ENV->set_lk_max_lockers(DB_ENV *dbenv, u_int32_t max);

# Description

Set the maximum number of simultaneous locking entities supported by the Berkeley DB lock subsystem. This value is used by DB_ENV->open to estimate how much space to allocate for various lock-table data structures. The default value is 1000 lockers. For specific information on configuring the size of the lock subsystem, see Configuring locking: sizing the system.

The DB_ENV->set_lk_max_lockers interface may be used only to configure Berkeley DB before the DB_ENV->open interface is called.

The DB_ENV->set_lk_max_lockers function returns a non-zero error value on failure and 0 on success.

The database environment's maximum number of lockers may also be set using the environment's DB_CONFIG file. The syntax of the entry in that file is a single line with the string "set_lk_max_lockers", one or more whitespace characters, and the number of lockers. Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.

# Errors

The DB_ENV->set_lk_max_lockers function may fail and return a non-zero error for the following conditions:

EINVAL
  An invalid flag value or parameter was specified.

  Called after DB_ENV->open was called.

The DB_ENV->set_lk_max_lockers function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB_ENV->set_lk_max_lockers function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# See Also

DB_ENV->set_lk_conflicts, DB_ENV->set_lk_detect, DB_ENV->set_lk_max, DB_ENV->set_lk_max_lockers, DB_ENV->set_lk_max_locks, DB_ENV->set_lk_max_objects, lock_detect, lock_get, lock_id, lock_put, lock_stat, and lock_vec.`

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