ORACLE Training in Lucknow

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About ORACLE Training Program


Oracle Database (commonly referred to as Oracle RDBMS or simply as Oracle) is an object-relational database management system produced and marketed by Oracle Corporation.An Oracle database is a collection of data treated as a unit. The purpose of a database is to store and retrieve related information. A database server is the key to solving the problems of information management. In general, a server reliably manages a large amount of data in a multiuser environment so that many users can concurrently access the same data. All this is accomplished while delivering high performance. A database server also prevents unauthorized access and provides efficient solutions for failure recovery.

Oracle Database is the first database designed for enterprise grid computing, the most flexible and cost effective way to manage information and applications. Enterprise grid computing creates large pools of industry-standard, modular storage and servers. With this architecture, each new system can be rapidly provisioned from the pool of components. There is no need for peak workloads, because capacity can be easily added or reallocated from the resource pools as needed.

The database has logical structures and physical structures. Because the physical and logical structures are separate, the physical storage of data can be managed without affecting the access to logical storage structures.




Features of ORACLE

  • Application Development
  • Business Intelligence
  • Clustering
  • Content Management
  • Database Security
  • Grid Computing and Management
  • Information Integration
  • Server Manageability and many more..


How ORACLE Works

  • An instance has started on the computer running Oracle (often called the host or database server).
  • A computer running an application (a local computer or client workstation) runs the application in a user process. The client application attempts to establish a connection to the server using the proper Oracle Net Services driver.
  • The server is running the proper Oracle Net Services driver. The server detects the connection request from the application and creates a dedicated server process on behalf of the user process.
  • The user runs a SQL statement and commits the transaction. For example, the user changes a name in a row of a table.
  • The server process receives the statement and checks the shared pool for any shared SQL area that contains a similar SQL statement.
  • The server process retrieves any necessary data values from the actual datafile (table) or those stored in the SGA.
  • The server process modifies data in the system global area. The DBWn process writes modified blocks permanently to disk when doing so is efficient. Because the transaction is committed, the LGWR process immediately records the transaction in the redo log file.
  • If the transaction is successful, then the server process sends a message across the network to the application. If it is not successful, then an error message is transmitted.
  • Throughout this entire procedure, the other background processes run, watching for conditions that require intervention. In addition, the database server manages other users' transactions and prevents contention between transactions that request the same data.


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