Recovering Data from Oracle Database

Oracle database is a collection of data that’s treated as a unit. The purpose of a database is to store and retrieve related information. A database server is the key for solving problems of information management. A server actually manages a large amount of data in a multi-user environment so that same data can be accessed by many users concurrently. A database server also prevents unauthorized access and provides efficient solutions for failure recovery.

Some of the most common causes of Oracle data loss can include:

• RAID corruption or failure.
• Accidental or intentional file deletion.
• Internal corruption in the database.
• Formatting and reinstallation.
• Failure of virtual servers containing databases.

Steps to recovering data from Oracle databases

• Search & Extract - if database file is inaccessible due to hardware issues the storage device is repaired. If the file is missing, deleted or truncated, the file system is adjusted to point so as to the correct data stream. If there are not any pointers remaining, the entire data area is searched to find and extract Oracle database data.
• Analysis & Report - Oracle toolset analyses of the complex internal structures of the extracted DBF (or .ORA) files and provide reports detailing about the recoverable tables and the number of data rows.
• Recover - The table data is copied into a SQL_LDR script to be imported into a new Oracle database.

Some common causes of data loss in Oracle Linux file systems are:

• File system or data corruption.
• LVM corruption.
• Deleted or partially overwritten data.
• RAID and storage/server hardware failures.

Recovering Data from Oracle VM

Data loss on virtual environments has high impact on the user organization, because multiple virtual machines can be affected by a just one technical or human error. Virtualization adds an extra layer of complexity to a host system and even when data loss occurs, you must be quick enough to respond on time.

Some common causes of data loss in Oracle VM environments include:

Also read: How to Protect Silent Data Corruption in Oracle

• Corruption of guest and host file system.
• Deleted virtual machines and snapshots.
• Internal virtual disk corruption.
• RAID and other storage/server hardware failures.
• Deleted or corrupt files contained within the virtual disk.

Hence for improving the performance of the oracle database, or to get rid any error you simply opt for some sophisticated software like Oracle File Repair Tool.  With the help of this software you can recover damaged, corrupt or inaccessible files from the database.