An application can be stand-alone and work only on a PC, or can work in a server - client mode, or on an Internet mode. An application is character- or GUI-based and provides a good presentation layer for a user to view information or enter data. A client - server informatica training in chennai application keeps only one copy of the application in, say, binary format in the server computer. Many users can concurrently use the same application from a client computer. A client just provides a copy of the application to the user.

A database is a normalized set of data. There are five levels of normalization. Most vendors today offer products, which fit into the Third Normal form of data normalization. Normalization eliminates data redundancy and functionally decomposes chaotic data into smaller units with relations. It is not enough to just store the data in a normal form. SQL is used to enter / retrieve the data from the database. Some popular commercial databases are- ACCESS, ORACLE, MS-SQLSERVER, INFORMIX, SYBASE, etc. Database technology has evolved into providing real-time retrieval speed for very large databases. Also, in a multi-user environment, the database technology is equipped to handle concurrent requests by locking internal data from conflicting user actions.

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