IBM's Indexed Sequential Access Method (ISAM)__________________________

question 26

Multiple Choice

IBM's indexed sequential access method (ISAM) __________________________.

• A) uses an index file for sequential access
• B) uses a small master index (kept in memory) that points to disk blocks of a secondary index, while the secondary index blocks point to the actual file blocks
• C) use the pointers (kept in memory) of the actual file blocks
• D) uses the pointers (kept in memory) that points to disk blocks of a master index which points to disk blocks of a secondary index, while the secondary index blocks point to the actual file blocks

---

Definitions:

Confidence interval

A set of values obtained from sample data which probably encompasses the value of an unspecified population parameter.

Average hourly income

The mean income earned by an individual per hour of work.

Standard deviation

A metric that calculates the degree of spread or variability within a data set.

Standard error

A measure of the statistical accuracy of an estimate, indicating the variability of sample means around the population mean.