For sequential access, makes available the next or previous logical record
from a file. For random access, makes available a specified record from a disk
file.
Opcode |
Operation |
File Types |
8D |
READ(sequential) WITH NO LOCK |
L S R I |
D8 |
READ (sequential) WITH LOCK |
L S R I |
D9 |
READ (sequential) WITH KEPT LOCK |
L S R I |
F5 |
READ (sequential) |
L S R I |
8C |
READ PREVIOUS WITH NO LOCK |
R I |
DE |
READ PREVIOUS WITH LOCK |
R I |
DF |
READ PREVIOUS WITH KEPT LOCK |
R I |
F9 |
READ PREVIOUS |
R I |
8E |
READ (random) WITH NO LOCK |
R I |
DA |
READ (random) WITH LOCK |
R I |
DB |
READ (random) WITH KEPT LOCK |
R I |
F6 |
READ (random) |
R I |
8F |
READ (direct) WITH NO LOCK |
L S R I |
D6 |
READ (direct) WITH LOCK |
L S R I |
D7 |
READ (direct) WITH KEPT LOCK |
L S R I |
C9 |
READ (direct) |
L S R I |
F1 |
READ (position) |
L S R I |