Viewing file:  log_put.html (3.74 KB) -rw-r--r--
Select action/file-type:
 (+) | (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
Berkeley DB: DB_ENV->log_put
DB_ENV->log_put
|
 |
#include <db.h>
int
DB_ENV->log_put(DB_ENV *env,
DB_LSN *lsn, const DBT *data, u_int32_t flags);
Description: DB_ENV->log_put
The DB_ENV->log_put method appends records to the log. The DB_LSN of
the put record is returned in the lsn parameter.
The DB_ENV->log_put method
returns a non-zero error value on failure
and 0 on success.
Parameters
- data
- The data parameter is the record to write to the log.
The caller is responsible for providing any necessary structure to
data. (For example, in a write-ahead logging protocol, the
application must understand what part of data is an operation
code, what part is redo information, and what part is undo information.
In addition, most transaction managers will store in data the
DB_LSN of the previous log record for the same transaction, to
support chaining back through the transaction's log records during
undo.)
- flags
- The flags parameter must be set to 0 or
the following value:
- DB_FLUSH
- The log is forced to disk after this record is written, guaranteeing
that all records with DB_LSN values less than or equal to the
one being "put" are on disk before DB_ENV->log_put returns.
- lsn
- The lsn parameter references memory into which
the DB_LSN of the put record is copied.
Errors
The DB_ENV->log_flush method
may fail and return one of the following non-zero errors:
- EINVAL
- If the record to be logged is larger than the maximum log record; or if an
invalid flag value or parameter was specified.
Class
DB_ENV, DB_LOGC, DB_LSN
See Also
Logging Subsystem and Related Methods
Copyright (c) 1996-2004 Sleepycat Software, Inc. - All rights reserved.
|