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What is meant by data-transfer rate?
The data-transfer rate is the rate at which data can be retrieved from or kept to the disk.
what is definition hierarchical data model
Redo Logs: Any database must have minimum two redo logs. These are the rules for the database; the redo logs record all modifies to the system objects or user objects. If any type
what is physical data structure
Event Occurrence of a process is called event. In other words, the object can receive many input instructions. The changes which occur due to these instructions are known as e
online eductional management system ke diagram
What is meant by heuristic optimisation?Discuss the major heuristics that are applied during query optimisation.
what are the reasons having variable length records
Backward Recovery (UNDO): In this system the uncommitted changes made by a transaction to a database are undone. Instead the system is reset to the last consistent state of databa
explain ANSI SPARC architecture
Types of Data fragmentation
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