OLAP (online analytical processing): is computer processing that enables a user to easily and selectively extract and view data from different points of view.
For example, a user can request that data be analyzed to display a spreadsheet showing all of a company’s beach ball products sold in Florida in the month of July, compare revenue figures with those for the same products in September, and then see a comparison of other product sales in Florida in the same time period.
OLTP ( Online transaction processing) : is a class of information systems that facilitate and manage transaction-oriented applications, typically for data entry and retrieval transaction processing.
LVM :- Logical Volume Manager and it’s a disk Management for Linux/UNIX Systems.
-The CDR (Call Details Record and also knows as Call Data Record) is a data record produced by a telephone exchange or other telecommunications equipment that contains attributes that are specific to a single instance of a phone call or other communication transaction that was handled by that facility or device. It is the automated equivalent of the paper toll tickets that were written and timed by operators for long-distance calls in a manual telephone exchange.
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