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Need for Client Server Computing-Client/Server (C/S) architecture includes running the application on multiple machines in which every machine with its component software tackles only a part of the job. Client machine is mainly a PC or a workstation that gives presentation services & the appropriate computing, connectivity & interfaces while the server machine gives database services, connectivity & computing services to multiple users. Both client machines & server machines are connected to the similar network. While the number of users grows, client machines can be added to the network whereas as the load on the database server enhances more servers can be connected by the network. Therefore, client-server combination is a scalable combination. Server machines are more powerful machines database services to multiple client requests.
The client-server systems are connected by the network. This network require not only be the Local Area Network (LAN). It can also be the Wide Area Network across multiple cities. The client & server machines communicate by standard application program interfaces (known as API), and remote procedure calls (RPC). The language by which RDBMS based C/S environment communicate is the structured query language (SQL).
What is the use of group by clause? Group by clause is used to be relevant aggregate functions to a set of tuples. The attributes given in the group by clause are used to shape
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
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Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.
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Why did SAP introduce the extended star schema? Explain why it is reported to be better than the traditional schema model?
These are the binary operations; i.e., each is applied to two relations or sets. These two relations can be union compatible excluding in case of Cartesian product. Two relations R
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