Which of the following is a transaction redundancy implementation?

A.
On-site mirroring

B.
Electronic Vaulting

C.
Remote Journaling

D.
Database Shadowing

Explanation:
On-site mirroring is a transaction redundancy solution.
Incorrect Answers:
B: Electronic vaulting is one type of transaction redundancy solution. Electronic vaulting makes copies of files
as they are modified and periodically transmits them to an offsite backup site.
C: Remote journaling is one type of transaction redundancy solution. Remote journaling is a method of
transmitting data offsite. It usually only includes moving the journal or transaction logs to the offsite facility, not
the actual files. These logs contain the deltas (changes) that have taken place to the individual files. If and
when data are corrupted and need to be restored, the bank can retrieve these logs, which are used to rebuild
the lost data.
D: Database Shadowing is one type of transaction redundancy solution. It is a mirroring technology used in
databases, in which information is written to at least two hard drives for the purpose of redundancy.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 938-939