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

Question

Quizplus · Accepted Answer

ISAM 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. This allows for efficient random access to records in the file.

IBM's Indexed Sequential Access Method (ISAM)__________________________