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Chapter IV.3 -
Accesses -- Indices and Selectors
Close index IND of table TAB. The presence of an open index is a slight overhead when replacing rows i.e. REPTAB and REPENT, which is why CLOIND is provided. Closing an index also saves space if it is known that it will not be needed again. Any attempt to reuse the index will automatically recreate it from scratch (so there is no OPEIND routine) - this may be time consuming.
SF and PP - CERN PTG - ADAMO Reference Manual for Version 3.3 - 13 Dec 93