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Berkeley DB: DB_ENV->txn_checkpoint
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DB_ENV->txn_checkpoint
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#include <db.h>
int
DB_ENV->txn_checkpoint(const DB_ENV *env,
u_int32_t kbyte, u_int32_t min, u_int32_t flags);
Description: DB_ENV->txn_checkpoint
If there has been any logging activity in the database environment since
the last checkpoint, the DB_ENV->txn_checkpoint method flushes the underlying
memory pool, writes a checkpoint record to the log, and then flushes the
log.
The DB_ENV->txn_checkpoint method
returns a non-zero error value on failure
and 0 on success.
The DB_ENV->txn_checkpoint method is the underlying method used by the db_checkpoint utility.
See the db_checkpoint utility source code for an example of using DB_ENV->txn_checkpoint
in a IEEE/ANSI Std 1003.1 (POSIX) environment.
Parameters
flags- The flags parameter must be set to 0 or
the following value:
DB_FORCE- Force a checkpoint record, even if there has been no activity since the
last checkpoint.
kbyte- If the kbyte parameter is non-zero, a checkpoint will be done
if more than kbyte kilobytes of log data have been written since
the last checkpoint.
min- If the min parameter is non-zero, a checkpoint will be done if
more than min minutes have passed since the last checkpoint.
Errors
The DB_ENV->txn_checkpoint method
may fail and return one of the following non-zero errors:
EINVAL- An
invalid flag value or parameter was specified.
Class
DB_ENV, DB_TXN
See Also
Transaction Subsystem and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.