public void set_h_nelem(int h_nelem) throws DbException;
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 be used only to configure Berkeley DB before the Db.open interface is called.
The Db.set_h_nelem method throws an exception that encapsulates a non-zero error value on failure.
The Db.set_h_nelem method may fail and throw an exception encapsulating a non-zero error for the following conditions:
Called after Db.open was called.
The Db.set_h_nelem method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods. If a catastrophic error has occurred, the Db.set_h_nelem method may fail and throw a DbRunRecoveryException, in which case all subsequent Berkeley DB calls will fail in the same way.
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