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DB->set_h_nelem |
#include <db.h>int DB->set_h_nelem(DB *db, u_int32_t h_nelem);
int DB->get_h_nelem(DB *db, u_int32_t *h_nelemp);
Set an estimate of the final size of the hash table.
In order for the estimate to be used when creating the database, the DB->set_h_ffactor method must also be called. If the estimate or fill factor are not set or are 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 method configures a database, not only operations performed using the specified DB handle.
The DB->set_h_nelem method may not be called after the DB->open method is called. If the database already exists when DB->open is called, the information specified to DB->set_h_nelem will be ignored.
The DB->set_h_nelem method returns a non-zero error value on failure and 0 on success.
The DB->set_h_nelem method may fail and return one of the following non-zero errors:
The DB->get_h_nelem method returns the estimate of the final size of the hash table.
The DB->get_h_nelem method may be called at any time during the life of the application.
The DB->get_h_nelem method returns a non-zero error value on failure and 0 on success.
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