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Berkeley DB: DB->truncate
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DB->truncate
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#include <db.h>
int
DB->truncate(DB *db,
DB_TXN *txnid, u_int32_t *countp, u_int32_t flags);
Description: DB->truncate
The DB->truncate method empties the database, discarding all records
it contains. The number of records discarded from the database is
returned in countp.
When called on a database configured with secondary indices using the
DB->associate method, the DB->truncate method truncates the primary
database and all secondary indices. A count of the records discarded
from the primary database is returned.
It is an error to call the DB->truncate method on a database with open
cursors.
The DB->truncate method
returns a non-zero error value on failure
and 0 on success.
Parameters
countp- The countp parameter references memory into which
the number of records discarded from the database is copied.
flags- The flags parameter is currently unused, and must be set to 0.
txnid- If the operation is part of an application-specified transaction, the
txnid parameter is a transaction handle returned from
DB_ENV->txn_begin; if the operation is part of a Berkeley DB Concurrent Data Store group, the
txnid parameter is a handle returned from
DB_ENV->cdsgroup_begin; otherwise NULL.
If no transaction handle is
specified, but the
operation occurs in a transactional
database,
the operation will be implicitly transaction protected.
Errors
The DB->truncate method
may fail and return one of the following non-zero errors:
DB_LOCK_DEADLOCK- A transactional database environment operation was selected to resolve
a deadlock.
DB_LOCK_NOTGRANTED- A Berkeley DB Concurrent Data Store database environment configured for lock timeouts was unable
to grant a lock in the allowed time.
EINVAL- If there are open cursors in the database; or if an
invalid flag value or parameter was specified.
Class
DB
See Also
Databases and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.