int DB->truncate(DB *db, DB_TXN *txnid, u_int32_t *countp, u_int32_t flags);
The DB->truncate interface empties the database, discarding all records it contains. The number of records discarded from the database is returned in countp.
If the operation is to be transaction-protected, the txnid parameter is a transaction handle returned from txn_begin; otherwise, NULL.
The flags parameter is currently unused, and must be set to 0.
The DB->truncate function returns a non-zero error value on failure and 0 on success.
The DB->truncate function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DB->truncate function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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