Indexed sequential access, an index is more useful when the number of record is

With indexed sequential access, an index is more useful when the number of record is large. Index is needed to order the elements of the data base by specific index. For example you have client database. You have city index in your data base and you can order your clients by the city where they live.

Hacking is when someone without the right to do so, goes into your accounts or stuff and takes over it and you can’t get back on it.

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