Berkeley DB

DbEnv::set_tx_recover

						#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; 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 ...