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What is De-normalization?
De-normalization is the method of attempting to optimize the performance of a database by adding redundant data. It is sometimes essential because current DBMSs execute the relational model poorly. A true relational DBMS would allow for a fully normalized database at the logical level, whereas providing physical storage of data that is tuned for high performance. De-normalization is a method to move from higher to lower normal forms of database modeling in order to speed up database access.
Recovery Techniques: After Reading the types of failures and database errors, let us talk about how to recover from the failures. Recovery can be complete using/restoring the previ
Explain the systems development life cycle. This is the traditional method to develop, maintain, and replace information systems that contains the project identification and se
What are the ways of obtaining the connection parameters? Hardwire the parameters into the program. Ask for the parameters interactively. Get the parameters
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
Horizontal Fragmentation- Horizontal fragmentation groups together the tuples in a relation that are collectively used by the main transactions. A horizontal fragment is produced b
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Mappings between Levels and Data Independence The 3 levels of abstraction in the database do not exist separately of each other. There must be some correspondence, or mapping
Explain the function of input controls. Identify four types of input control and explain the function of each. Provide an example of a data integrity error that could occur i
Explain the components of Database System in details.
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
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