Which of the following would be considered a poor candidate for deduplication?

A high performance OLTP (Online Transaction Processing) database is a poor candidate for deduplication because these databases often have data blocks that are highly unique or change frequently, providing little deduplication benefit, and the overhead of deduplication can significantly impact the required high I/O performance. Deduplication adds processing and latency that OLTP databases cannot tolerate.

Tape based backups typically do not support inline deduplication efficiently due to the sequential access nature of tape, but the data itself could be deduplicated before being written to tape. The question asks about a candidate for deduplication, not the medium's capability.

A filesystem or share containing unstructured Windows files and documents, like user home directories or shared drives, is an excellent candidate for deduplication due to the high redundancy often found across multiple users' files.

Disk based backups are generally excellent candidates for deduplication because they often contain many identical blocks across full and incremental backups of the same systems over time.