The data dictionary of a DBMS. The system catalogue stores meta-data including the schemas of the databases. It is a mini-database, and is usually stored using the DBMS itself in special tables called system tables. It maybe referred to as being "on line", as it is active, and can be queried by users like any other table.
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it minimises losses through theft
library catalogue functions
sinusoidal functions are the function of sin/cos then using this function minimise the jerk in the system
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It's nice to have a backup in case your computer is fried.
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Importance of system administration
importance of circular function
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