int DB->del(DB *db, DB_TXN *txnid, DBT *key, u_int32_t flags);
The DB->del function removes key/data pairs from the database. The key/data pair associated with the specified key is discarded from the database. In the presence of duplicate key values, all records associated with the designated key will be discarded.
When called on a database that has been made into a secondary index using the DB->associate function, the DB->del function deletes the key/data pair from the primary database and all secondary indices.
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->del function returns a non-zero error value on failure, 0 on success, and DB_NOTFOUND if the specified key did not exist in the file.
The DB->del function may fail and return a non-zero error for the following conditions:
The DB->del 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->del 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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