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

DB_ENV->set_lk_max_locks |

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    #include <db.h>

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

    int
    DB_ENV->get_lk_max_locks(DB_ENV *dbenv, u_int32_t *lk_maxp);

Description: DB_ENV->set_lk_max_locks

Set the maximum number of locks supported by the Berkeley DB environment. 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 locks. For specific information on configuring the size of the lock subsystem, see Configuring locking: sizing the system.

The database environment's maximum number of locks may also be configured 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_locks", one or more whitespace characters, and the number of locks. Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.

The DB_ENV->set_lk_max_locks method configures a database environment, not only operations performed using the specified DB_ENV handle.

The DB_ENV->set_lk_max_locks method may not be called after the DB_ENV->open method is called. If the database environment already exists when DB_ENV->open is called, the information specified to DB_ENV->set_lk_max_locks will be ignored.

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

Parameters
max

- The max parameter is the maximum number of locks supported by the Berkeley DB environment.

Errors

The DB_ENV->set_lk_max_locks method may fail and return one of the following non-zero errors:

EINVAL

- If the method was called after DB_ENV->open was called; or if an invalid flag value or parameter was specified.

Description: DB_ENV->get_lk_max_locks

The DB_ENV->get_lk_max_locks method returns the maximum number of locks.

The DB_ENV->get_lk_max_locks method may be called at any time during the life of the application.

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

Parameters
lk_maxp

- The DB_ENV->get_lk_max_locks method returns the maximum number of locks in lk_maxp.

Class DB_ENV, DB_LOCK
See Also Locking Subsystem and Related Methods`

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