Berkeley DB

DB→set_h_nelem

						#include <db.h>
						int
						DB→set_h_nelem(DB *db, 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 function returns a non-zero error value on failure and 0 on success.

Errors

• EINVAL An invalid flag value or parameter was specified.

  Called after DB→open was called.