Oracle database net

Redundant Arrays of Inexpensive Disks Technology (RAID)

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Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted

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Workshop Methodology Group-Oriented and Interactive Structure The workshop is structured to allow individuals to work in groups to perform database backup, restore, and recovery operations. Each group is encouraged to share its approach to resolving database failures with other groups in the class. Intensive Hands-On Diagnosis and Problem Resolution The intent is to provide you with as much hands-on experience as possible to diagnose and work through backup and recovery scenarios.

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Cross Checks of RMAN Backups and Copies Performing a cross check provides you with a way to ensure that data about backup sets and image copies in the RMAN repository is synchronized with corresponding data on disk or in the media management catalog. You can use the LIST command to obtain a report of the backups and copies that you have made and then use the CROSSCHECK command to check that these files still exist. If RMAN cannot find a file, it updates the repository records to EXPIRED. You can determine which files are marked EXPIRED by issuing a LIST EXPIRED command....

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Using Oracle Enterprise Manager You can use the Recovery Wizard to restore and recover your database. On the Range Selection page you must enter a date and time to restore to a previous point. You use Instance Management or the Console to open the database after the job has completed. You can view the status of the job by selecting the Active and History page tabs in the Console’s Job window.

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Restoration and Datafile Media Recovery Using RMAN RMAN automates the procedure for restoring files. When you issue the RESTORE command, RMAN uses a server session to restore the correct backups and copies. The RMAN repository is used to select the best available backup set or image copies to use in the restoration. By default, RMAN does not restore a file if the file is already in the correct place and its header contains the correct information. In releases before Oracle9i, the files were always restored.

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Client-Server Application Connection Oracle Net enables a network connection between a client and an Oracle database server. Oracle Net is a software component that resides on both the client and on the Oracle database server. It is layered on top of the network protocol. When a connection is initiated from a client to the Oracle database server, data is passed down a stack on the client, over the network, and up a similar stack to the Oracle database server.

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In either case, the easiest way is to drop the entire tablespace that contains the datafile. The steps that are to be executed from within SQL*Plus are: 1. STARTUP MOUNT 2. For each deleted datafile, issue the command ALTER DATABASE DATAFILE ’full path of filename’ OFFLINE [DROP]; Note: You must use the DROP option if the database is in NOARCHIVELOG mode, because you cannot recover this file if you apply incomplete media recovery on it via the command ALTER DATABASE OPEN RESETLOGS. See the SQL Reference for details. 3. ALTER DATABASE OPEN; 4.

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[ Team LiB ] Recipe 2.20 Retrieving Data from an Oracle Package Problem Given an Oracle package that returns multiple result sets for related tables as REF CURSOR data types, you want to access this data using a DataReader and load the data into a DataSet. Solution Use the data type OracleType.Cursor .

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[ Team LiB ] Recipe 9.12 Reading and Writing Binary Data with Oracle Problem You need to read and write binary data from and to an Oracle database. Solution Use the techniques shown in the following example. The sample code contains two event handlers

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[ Team LiB ] Recipe 4.4 Getting a Sequence Value from Oracle Problem When you add a row into an Oracle table that uses a sequence to generate the value for a primary key column, the value assigned to the column in the DataTable is replaced by a value generated by the database.

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Connecting to an Oracle Database Problem You want to connect to an Oracle database. Solution You can connect to an Oracle database using either the Oracle .NET data provider or the OLE DB .NET data provider. The sample code contains two event handlers

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Step 3: Set the CommandText Property of the SqlCommand Object You use SQL to work with the information stored in a database. SQL is an industry standard language supported by SQL Server, Access, and Oracle

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