#include <db_cxx.h> int DbEnv::set_lk_max_objects(u_int32_t max);
This method is deprecated. Instead, use DbEnv::set_memory_init(), DbEnv::set_memory_max(), and DbEnv::set_lk_tablesize().
Set the maximum number of locked objects supported by the Berkeley DB environment. This value is used by DbEnv::open() to estimate how much space to allocate for various lock-table data structures. The default value is 1000 objects. The final value specified for the lock objects should be more than or equal to the number of lock table partitions. For specific information on configuring the size of the lock subsystem, see Configuring locking: sizing the system.
The database environment's maximum number of objects 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_objects", one or more whitespace characters, and the number of objects. Because the DB_CONFIG file is read when the database environment is opened, it will silently overrule configuration done before that time.
         The DbEnv::set_lk_max_objects() method configures a database
         environment, not only operations performed using the specified 
         DbEnv  handle.
    
         The DbEnv::set_lk_max_objects() method may not be called after the
         DbEnv::open()  method is
         called. If the database environment already exists when 
         DbEnv::open()  is called, the
         information specified to DbEnv::set_lk_max_objects() will be
         ignored.
    
         The DbEnv::set_lk_max_objects() 
            
            
                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 DbEnv::set_lk_max_objects() 
            
            
                method may fail and throw a DbException 
                exception, encapsulating one of the following non-zero errors, or return one
                of the following non-zero errors:
            
        
                    
If the method was called after DbEnv::open() was called; or if an invalid flag value or parameter was specified.