Persistent data is rarely changed and can be stored on a server or disk for archival purposes. It is useful for researchers and to reduce digital clutter on hard drives.
Computers and storage devices are full of data, and there are many different forms of data, depending on how often the data is accessed or changed. Persistent data is data that is not typically accessed and rarely changed. Persistent database data is typically stored on a server and is more commonly accessed than archived data. With archived data, or that stored on disks or tapes, the information is very rarely opened or used. In addition to data storage, this allows researchers to examine old or archived information to find past trends that might apply to current situations.
Persistent data is very rarely changed; this means that the information stored within the database, disk or tape is not changed, except on special occasions. The information that is accessed is more common than the information that is changed, but this is still rarely the case. This data also exists from session to session, unlike data types that exist only for one session and are then discarded or associated with that single session.
With persistent database data, an entire database or a section of a database is created to hold the archived data. This can be done locally, on a database stored on your computer’s hard drive, or it can be located on a server. This persistent information is more commonly accessed than the tape and disk variant, because the information is readily available. At the same time, this database will usually remain intact for months or years.
Persistent data on tape and disk is not meant to be touched or loaded into a computer for years. This data is intended for archival purposes only and is accessed very rarely. Persistent information is often large, so it is commonly erased from the local hard drive once the information is stored, so tape or disk is usually the only copy of the data.
There are several reasons why a developer or administrator would want to store persistent data. While the information may not be current or currently useful, the data may be useful to researchers later, or it may be useful for finding a trend based on old information. Another reason is to reduce digital clutter from your hard drive. Hard drives need space to function, and large chunks of persistent data can easily take up an entire hard drive. To avoid a full hard drive, the administrator will archive unused data.
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