An IS auditor finds that, at certain times of the day, the data warehouse query performance decreases
significantly. Which of the following controls would it be relevant for the IS auditor to review?

A.
Permanent table-space allocation

B.
Commitment and rollback controls

C.
User spool and database limit controls

D.
Read/write access log controls

Explanation:
User spool limits restrict the space available for running user queries. This prevents poorly formed queries from
consuming excessive system resources and impacting general query performance. Limiting the space available
to users in their own databases prevents them from building excessively large tables. This helps to control
space utilization which itself acts to help performance by maintaining a buffer between the actual data volume
stored and the physical device capacity. Additionally, it prevents users from consuming excessive resources in
ad hoc table builds (as opposed to scheduled production loads that often can run overnight and are optimized
for performance purposes), in a data warehouse, since you are not running online transactions, commitment
and rollback does not have an impact on performance. The other choices are not as likely to be the root cause
of this performance issue.