Data linkage recovery via the system log file provides the following benefits:

• The recovery procedure is simple.
• The following files can be recovered without having to terminate applications at the source:
  
  • Extraction master status file
  • Data linkage file
  • Extraction server status file
  • Import master status file
  • Import information queue file
  • Import status file

However, note the following:

• This recovery method cannot be used if the system log file has been overwritten.
• The amount of transmission data increases because during normal operation various recovery information is added to the normal update information for sending to the target Datareplicator.

The following figure provides an overview of data linkage recovery via the system log file in the event of an error in the extraction information queue file.

Figure 9-3 Overview of data linkage recovery via the system log file