DbEnv::set_tx_recover

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#include <db_cxx.h>

int DbEnv::set_tx_recover(int (*)(DbEnv *dbenv, Dbt *log_rec, DbLsn *lsn, db_recops op));

Description

Set the application's method to be called during transaction abort and recovery. This method must return 0 on success and either errno or a value outside of the Berkeley DB error name space on failure. It takes four arguments:

dbenv
A Berkeley DB environment.

log_rec
A log record.

lsn
A log sequence number.

op
One of the following values:

DB_TXN_BACKWARD_ROLL
The log is being read backward to determine which transactions have been committed and to abort those operations that were not; undo the operation described by the log record.

DB_TXN_FORWARD_ROLL
The log is being played forward; redo the operation described by the log record.

DB_TXN_ABORT
The log is being read backward during a transaction abort; undo the operation described by the log record.

The DbEnv::set_tx_recover interface may be used only to configure Berkeley DB before the DbEnv::open interface is called.

The DbEnv::set_tx_recover 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.

Errors

The DbEnv::set_tx_recover 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.

Called after DbEnv::open was called.

The DbEnv::set_tx_recover 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::set_tx_recover 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, and DbEnv::txn_stat.

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