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DbEnv::txn_checkpoint
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#include <db_cxx.h>
int
DbEnv::txn_checkpoint(u_int32_t kbyte, u_int32_t min, u_int32_t flags) const;
Description
The DbEnv::txn_checkpoint method flushes the underlying memory pool,
writes a checkpoint record to the log, and then flushes the log.
If either kbyte or min is non-zero, the checkpoint is
done only if there has been activity since the last checkpoint, and
either more than min minutes have passed since the last
checkpoint or if more than kbyte kilobytes of log data have been
written since the last checkpoint.
The flags value 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.
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, 0 on success, and returns DB_INCOMPLETE if there were pages that needed to be
written to complete the checkpoint but that DbEnv::memp_sync was unable
to write immediately.
Errors
The DbEnv::txn_checkpoint method may fail and throw an exception or return a non-zero error for the following conditions:
- EINVAL
- An invalid flag value or parameter was specified.
The DbEnv::txn_checkpoint method may fail and throw an exception or return a non-zero error for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv::txn_checkpoint method may fail and either
return DB_RUNRECOVERY or throw an exception encapsulating
DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail
in the same way.
Class
DbEnv, DbTxn
See Also
DbEnv::set_tx_max,
DbEnv::set_tx_recover,
DbEnv::set_tx_timestamp,
DbTxn::abort,
DbEnv::txn_begin,
DbEnv::txn_checkpoint,
DbTxn::commit,
DbTxn::discard,
DbTxn::id,
DbTxn::prepare,
DbEnv::txn_recover,
DbTxn::set_timeout
and
DbEnv::txn_stat.
Copyright Sleepycat Software
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