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 (other than by specifying the DB_AUTO_COMMIT flag), the txnid parameter is a transaction handle returned from DB_ENV->txn_begin; otherwise, NULL.
The flags value must be set to 0 or the following value:
The DB->truncate method returns a non-zero error value on failure and 0 on success.
The DB->truncate method may fail and return a non-zero error for the following conditions:
The DB->truncate method 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 method may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.
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