db truncate [-txn txnid]
Empties the database, discarding all records it contains.
The options are as follows:
-txn txnid
If the operation is part of an application-specified transaction, the txnid parameter is a transaction handle returned from env txn. If no transaction handle is specified, but the operation occurs in a transactional database, the operation will be implicitly transaction protected.
The db truncate command returns the number of records discarded from the database on success.
In the case of error, a Tcl error is thrown.