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Answer Posted / rohit
Currency in IDMS is your current location in database.
To help keep track of where we are in the database, IDMS/R
maintains pointers to a number of different record
occurrences as each run unit executes. We use the term
currency to refer to these pointers.
To enable a program to position itself and move about in
the database, IDMS/R maintains a Currency Table for each
run unit.
The currency is the db-key of the most recently accessed
record occurrence.
IDMS/R maintains four types of currency (Currency Table)
for each run unit:
? Record Currency (Current of record type). The db-
key of the most recent record occurrence of each record
type accessed by the program. IDMS/R maintains a separate
currency for each record type defined in the subschema.
? Set Currency (Current of set type). The db-key of
the most recent record occurrence of each set type accessed
by the program. IDMS/R maintains a separate currency for
each set type defined in the subschema.
? Area Currency (Current of area). The db-key of the
most recent record occurrence of each area accessed by the
program. IDMS/R maintains a separate currency for each area
to which the program has access.
? Run Unit Currency (Current of run unit). The db-key
of the most recent record occurrence accessed by the
program.
| Is This Answer Correct ? | 20 Yes | 3 No |
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