Why are ADHD medications prescribed for children? ADHD medications are prescribed to improve attention and reduce hyperactivity and impulsivity in children. They may also be used to improve ability to focus, work and learn. In addition, they may be used to reduce aggression, provide a calming effect and improve coping with frustration.
There are two type of access method random access and sequential access. To go from point A to point Z in a sequential-access system, you must pass through all intervening points. In a random-access system, you can jump directly to point Z.Disks are random access media, whereas tapes are sequential access media.
Sequential Access. When the access mode is sequential, the method of record retrieval changes as per the selected file organization. For sequential files, records are accessed in the same order in which they were inserted. For indexed files, the parameter used to fetch the records are the record key values.andom Access. When the access mode is RANDOM, the method of record retrieval changes as per the selected file organization. For indexed files, records are accessed according to the value placed in a key field which can be primary or alternate key. There can be one or more alternate indexes.