Sequential and direct access locate memory data. Who benefits from instant device access? How can we change data on a direct-access device using sequential access?

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Sequential and direct access locate memory data. Who benefits from instant device access? How can we change data on a direct-access device using sequential access?

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Sequential access and direct access are two different ways of locating data in memory.

Sequential access involves reading or writing data in the order in which it is stored. This means that data can only be accessed by starting at the beginning and reading through the data until the desired piece of information is found. This method is typically slower than direct access, but is often used when accessing data on tape or other sequential devices.

Direct access, on the other hand, allows data to be accessed instantly by specifying its location in memory. This means that data can be retrieved or updated quickly, without the need to search through other data. Direct access is typically used with hard drives, solid-state drives, and other random-access memory devices.

The benefits of instant device access through direct access are significant, particularly for applications that require quick access to large amounts of data. This includes everything from database management to video editing to gaming. In general, any application that requires frequent read/write operations and/or real-time processing can benefit from direct access.

 

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