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Buffers: The Modern computers are able of handling I-O operations independent of the CPU by means of the hardware termed as data channel. For illustration, if two buffers a
ADD and SUBTRACT CORRESPONDING: The CORRESPONDING option can also used with the ADD and SUBTRACT verbs. The following are some of the formats of these verbs with the CORRESPON
File volatility: File volatility associates to the number of times the updating of records are needed during some time period. File interrogation: Some files hold re
Example of read statement: Illustration: READ OLD-MASTER AT END MOVE ZERO TO END-OF-RECORDS. As a result of this statement, generally the next record from the OLD-MAST
IF ... ELSE STATEMENT: We are familiar with an easy form of the IF statement. The common form of the IF statement is as shown below: Each of the statement-1 and statem
RULES OF MOVE VERB: The Data movement is managed by the rules which are as shown below: (a) The contents of the identifier - 1 or the value of the literal - 1 is moved to
Block Size: The normal practice is to group a number of consecutive records to form that is termed as a block or a physical record. The number of records in a block is frequen
what does it used
SEARCH VERB: The SEARCH verb is used to position elements in one-dimensional tables. Let us consider the following problem. Assume that each element of a table consists of thr
WRITE statement: The WRITE statement for tape and sequential-disk files has the syntax shown below. WRITE record-name [ FROM identifier ] As a resu
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