public int truncate(DbTxn txnid, int flags) throws DbException;
The Db.truncate interface empties the database, discarding all records it contains. The number of records discarded from the database is returned.
If the operation is to be transaction-protected, the txnid parameter is a transaction handle returned from DbEnv.txn_begin; otherwise, null.
The flags parameter is currently unused, and must be set to 0.
The Db.truncate method throws an exception that encapsulates a non-zero error value on failure.
The Db.truncate 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.truncate 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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