Online Update

Definition

On-line Update describes the degree to which internal logical files are updated on-line.

The application provides on-line update for the internal logical files.

Score As	Descriptions To Determine Degree of Influence
0	None.
1	On-line update of one to three control files is included. Volume of updating is low and recovery is easy.
2	On-line update of four or more control files is included. Volume of updating is low and recovery is easy.
3	On-line update of major internal logical files is included.
4	In addition, protection against data loss is essential and has been specially designed and programmed in the system.
5	In addition, high volumes bring cost considerations into the recovery process. Highly automated recovery procedures with minimum human intervention are included.

On-line update usually requires a keyed file or database.
Automatic recovery provided by the operating system counts if it impacts the application.

Pure batch applications receive a score of 0.
On-line updates of files that modify the way an application processes or validates data receive a score of 1 or 2.
On-line updates of user persistent data receive a score of 3.
MIS applications receive a score of 3 or less.
Most GUI type applications receive a score of 3 or above.
Applications which use programmed recovery such as SQL roll back and commit receive a score of 4. Operational/routine backup is not considered protection against data loss.
Applications required to recover data, reboot, or perform other self-contained functions in the event of a system error receive a score of 5. Recovery may require a human to press enter or perform some other minimal function to initiate this process.