The final stage of database design is to make the decisions that affect performance, scalability, recovery, security, and the like. This is often called physical database design. A key goal during this stage is data independence, meaning that the decisions made for performance optimization purposes should be invisible to end-users and applications. Physical design is driven mainly by performance requirements, and requires a good knowledge of the expected workload and access patterns, and a deep understanding of the features offered by the chosen DBMS.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What factor is not reflected in performance requirements?
Ah, so.. unanswerable

A squab is the name given to the young of domestic pigeons that are destined for the table. Like other domesticated pigeons, birds used for this purpose are descended from the rock pigeon (Columba livia). Special utility breeds with desirable characteristics are used. Two eggs are laid and incubated for about 17 days. When they hatch, the squabs are fed by both parents on "pigeon's milk", a thick secretion high in protein produced by the crop. Squabs grow rapidly, but are slow to fledge and are ready to leave the nest at 26 to 30 days weighing about 500 g (18 oz). By this time, the adult pigeons will have laid and be incubating another pair of eggs and a prolific pair should produce two squabs every four weeks during a breeding season lasting several months.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How often are pigeons able to breed for the consumption process ?
Ah, so.. a prolific pair should produce two squabs every four weeks during a breeding season lasting several months

In Andorra, Catalan has always been the sole official language. Since the promulgation of the 1993 constitution, several Andorranization policies have been enforced, like Catalan medium education.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What policies are the Andorrans enforcing?
Ah, so..
Andorranization policies