When you use with standby_access to dump the transaction log, the dump proceeds to the furthest point in the log at which all earlier transactions have completed and there are no records belonging to open transactions.
Use the with standby_access option to dump transaction logs for loading into a server that acts as a warm standby server for the database.
You must use dump tran[saction]...with standby_access in all situations where you load two or more transaction logs in sequence and you want the database to be online between loads.
After loading a dump made with the with standby_access option, use the online database command with the for standby_access option to make the database accessible.