subject: Recovering Tablespace From Corrupt Oracle Database [print this page] Recovering Tablespace From Corrupt Oracle Database
A tablespace in Oracle database is mainly a logical storage unit that comprises of at least one datafile. This datafile consists of all the tables, indexes that a database administrator creates in an Oracle database. A tablespace acts as a bridge between the file system in which the index or table information is saved, and the Oracle database. Corruption in the tablespaces can occur due to various reasons, like improper system/database shutdown, virus infection, media block corruption, and operating system damage. In such cases of tablespace corruption, the database becomes unmountable and the records saved in the database becomes inaccessible To surmount such tablespace corruption scenarios, in case of no 'hot backup' or 'standby database' availability, the database administrator needs to opt for an effective third-party Oracle Database Recovery application.
To illustrate the above case, consider you are working on a large database with more than one lac records. You run a query to modify a particular field in the database. However, when the query execution was in progress, the system shutdown due to power outage. Now, when you try to mount the database, it does not mount. Moreover, all the one lac records saved in the database become inaccessible. In addition, you also encounter an error message while trying to mount your Oracle database.
Cause
The fundamental reason responsible for unmountability of your Oracle database is its corruption due to improper system shutdown.
Resolution
To surmount the above tablespace corruption issues and to access the database records, you will need to follow the below steps:
Restore the database from an updated backup.
In case of deficient or no backup available, you need to recover the tablespace using an effective third-party Oracle Database Recovery application.
An oracle database recovery utility employs advanced database recovery techniques to repair a logically damaged database and recover almost all database components, tables, tablespace, triggers, and more. The software is totally read only in nature and performs recovery without any modifications or overwriting. The user-friendly interface of these software makes the utility easy-to-understand and operate.
Oracle Recovery v1.0 is a powerful solution to repair almost all logically damaged Oracle 9i databases. The oracle database repair utility allows manual selection of databases. The non-destructive software retrieves almost all database objects. The software can be installed on Windows 2003 and XP operating systems.
