#include <db.h> int DB_ENV->set_lk_max_lockers(DB_ENV *dbenv, u_int32_t max);
This method is deprecated. Instead, use DB_ENV->set_memory_init(), DB_ENV->set_memory_max(), and DB_ENV->set_lk_tablesize().
Sets the maximum number of locking entities 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 lockers. For specific information on configuring the size of the lock subsystem, see Configuring locking: sizing the system.
The database environment's maximum number of lockers 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_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.
         The DB_ENV->set_lk_max_lockers() method configures a database
         environment, not only operations performed using the specified 
         DB_ENV  handle.
    
         The DB_ENV->set_lk_max_lockers() 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_lockers() will be
         ignored.
    
         The DB_ENV->set_lk_max_lockers() 
            
                  method returns a non-zero error value on failure and 0 on success.
            
            
        
    
                         The DB_ENV->set_lk_max_lockers() 
            
                 method may fail and return one of the following non-zero errors:
            
            
        
                    
If the method was called after DB_ENV->open() was called; or if an invalid flag value or parameter was specified.