Aries is a complete algorithm for undo/redo logging.

Differences to what we have described:

• log records contain a sequence numnber (LSN)
  
• LSNs used in tx and buffer managers, and stored in data pages
• additional log record to mark <END> (of commit or abort)
• <CHKPT> contains only a timestamp
• <ENDCHKPT..> contains tx and dirty page info