A DBA (Database Administrator) encounters numerous error messages while working on a production database. These error message are mainly related to network trouble, problem with instances, or database corruption. While network and instance jobs can be handled easily, the database corruption error message is very difficult to surmount. Few main causes for Oracle database corruption are Oracle bugs, virus hit, unsupported disk repair applications, and damaged hardware. After an Oracle database corruption error message appears, the instance does start further rendering to inaccessibility of saved data. In such cases, if a DBA has created complete backup of the database, then s/he has nothing to worry. However, if no backup exists, then the DBA needs to search for an effective third-party Oracle Database Recovery application.
To elaborate the above case, consider a practical case, wherein you have Oracle 9i database (Employee) on your Windows XP machine. The database is in NONARCHIVELOG mode and all the records are stored in SYSTEM tablespace. When you try to run a SQL command to access the records saved in the Employee database, you encounter the below error message:
ORA-01145: offline immediate disallowed unless media recovery enabled.
After the above error message appears, the Employee database records become inaccessible.
The above error message pops up when UNDOTBS01.dbf is corrupted.
To get rid of the above error message and to access the Employee database records, you will need to restore from a cold backup. However, doing so means that you will have to loose all your updated data. In such cases, if you want to save your data and repair Oracle database, then you will need to opt for an effective Oracle Recovery utility.
An oracle database repair application repairs logically corrupt databases in a few easy steps. The repaired database is in reusable state and can also be saved at your preferred destination. The highly advanced recovery mechanism to recover Oracle database ensures complete and maximum recovery, without making any changes in the original database. Easily downloadable from the Internet, these tools can be used by any database user.
Stellar Oracle Database Recovery is an extremely powerful Oracle database recovery application that recovers all logically corrupt databases created in Oracle 9i. With recovery of almost all Oracle database objects, tables, schemas, indexes, and more, the recovery tool can recover Oracle database irrespective of its cause of corruption.
My name is Mark Willium, I have done Ph.D in computer science and currently doing research on how to recover and repair corrupted Oracle database. You can have more information about about Oracle recovery software by visiting clicking here http://www.oraclerecovery.blogspot.com/