# DbEnv::set_lk_max

`

###

    #include <db_cxx.h>

    int
    DbEnv::set_lk_max(u_int32_t lk_max);

# Description

Set the maximum number of locks to be held or requested in the table. This value is used by DbEnv::open to estimate how much space to allocate for various lock-table data structures. If no value is specified, a default value is used.

The DbEnv::set_lk_max interface may only be used to configure Berkeley DB before the DbEnv::open interface is called.

The DbEnv::set_lk_max method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

The environment's maximum number of locks 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", one or more whitespace characters, and the number of locks. Configuration in the DB_CONFIG file silently overrules configuration done using the DbEnv::set_lk_max method.

# Errors

EINVAL
  An invalid flag value or parameter was specified.

  Called after DbEnv::open was called.

### Classes

DbEnv, DbLock

# See Also

DbEnv::set_lk_conflicts, DbEnv::set_lk_detect, DbEnv::set_lk_max, DbEnv::lock_detect, DbEnv::lock_get, DbEnv::lock_id, DbLock::put, DbEnv::lock_stat and DbEnv::lock_vec.`

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