Berkeley DB

Db::set_h_nelem

						#include <db_cxx.h>
						int
						Db::set_h_nelem(u_int32_t h_nelem);
					

Description

Set an estimate of the final size of the hash table.

If not set or set too low, hash tables will still expand gracefully as keys are entered, although a slight performance degradation may be noticed.

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

The Db::set_h_nelem 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.

Errors

• EINVAL An invalid flag value or parameter was specified.

  Called after Db::open was called.