declarative and file status clausethe
DECLARATIVE and FILE STATUS Clause:
The input-output exception condition in the situation of a direct access files can be handled by a declarative procedure in a manner similar to that of sequential files.
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rewrite statementas in the situation of a relative file the rewrite statement needs that the file should be opened in the i-o mode and if the
delete statementthe file should be opened in the i-o mode if the access is sequential the invalidkey phrase must be specified rather than the last
start statementthe start statement places the files to the initial logical record whose record key satisfies the condition specified by the key
file description for the relative and indexed filesthe fd entry for a relative or an indexed file is similar to that of a sequential file some
declarative and file status clausethe input-output exception condition in the situation of a direct access files can be handled by a declarative
direct organizationbesides the relative or indexed organization also a direct access file can be designed to have what is termed as direct
selection of file organizationwhile designing a file the programmer should select an appropriate association for a file the order in which the choice
file activitythe file activity is a measure of the proportion of records processed during an update runtherefore we define the activity ration as
file volatilityfile volatility associates to the number of times the updating of records are needed during some time periodfile interrogationsome
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