Berkeley DB: DbEnv::txn_checkpoint
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

DbEnv::txn_checkpoint |

`

    #include <db_cxx.h>

    int
    DbEnv::txn_checkpoint(u_int32_t kbyte, u_int32_t min, u_int32_t flags) const;

Description: DbEnv::txn_checkpoint

If there has been any logging activity in the database environment since the last checkpoint, the DbEnv::txn_checkpoint method flushes the underlying memory pool, writes a checkpoint record to the log, and then flushes the log.

The DbEnv::txn_checkpoint method either returns a non-zero error value or throws an exception that encapsulates a non-zero error value on failure, and returns 0 on success.

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 DbEnv::txn_checkpoint method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

EINVAL

- An invalid flag value or parameter was specified.

Class DbEnv, DbTxn
See Also Transaction Subsystem and Related Methods`

Copyright (c) 1996,2008 Oracle. All rights reserved.