Posts Tagged Window XP

NaggieCHKDSK/F Fails to Fix File System Problems

Monday, May 31st, 2010

One of the most common reasons for unbootability of the computer system is the file system corruption in Windows XP. And for damage in file system, the reasons responsible for that are unexpected system shutdown (due to power outage or human mistakes), virus infection, MFT (Master File Table) damage, and more.

In order to get past the corruption issues in a Windows XP system is by executing CHKDSK/F command. This command checks the physical and logical integrity of the file system and repairs it in case of any damage.

Though the command, in most of the situations, is a life-saver, but do not guarantee 100% success in every life system corruption issue. In such cases, when the CHKDSK command fails to repair, an ideal alternative is to reinstall Windows XP and restore data from an updated backup. However, in case no backup is available, the user can easily recover data using a commercial Windows Recovery application.

Let’s consider a practical scenario that explains the above situation. You encounter the below error message at the startup of Windows XP operating system:

“C:\$MFT is corrupt and unreadable. Please run the chkdsk utility.”

After the above boot error message pops up, your system becomes unbootable and its data gets inaccessible. As suggested in the error message, when you run CHKDSK utility, you encounter another error message:

In the master file table (MFT) bitmap, CHKDSK discovered free space marked as allocated. CHKDSK discovered free space marked as allocated in the volume bitmap. Windows found problems with the file system. Run CHKDSK with the /F (fix) option to correct these.

As error message suggest, when you execute CHKDSK utility with ‘/F’ parameter, it shows the same error message. Since the system could not be started, the data saved in the Windows based hard drive remains inaccessible.

Resolution: In order to overcome the CHKDSK/F failure error message, follow the step mention below:

1. Reinstall Windows XP on your system.
2. Restore the data from an updated backup. In case no backup is available, use a commercial Windows Data Recovery utility.

Such windows data recovery tools use effective recovery techniques to perform complete recovery of all formatted files and folders.

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ShwetaHow to Avert and Resolve Oracle Database Corruption

Friday, April 16th, 2010

A database administrator needs to perform various operations like performing incremental backups, identifying and resolving network issues, viewing archive log destination, error generation in alert log, etc. in order to ensure that the database always remains in a running state. However, the possibility of database corruption exists due to human mistakes, virus attacks, and hardware corruption.

Database remains unmountable in most cases after it is corrupted, further rendering to inaccessibility of all its records. In such situations, if the administrator wants to access the Oracle database records, then he/she will need to use a cold backup to restore the database. However, if the administrator has not created any backup or the backup is not sufficient to meet all his/her requirements, then he/she needs to use an advanced third-party Oracle Recovery utility to repair the database.

Let’s consider a practical case, where you, as a database administrator, perform below steps:

1.You copy your database file when your database is alive.
2. Then you update the table stored in the data file.
3. After this, you shutdown the database using ’shutdown immediate’ command and change the datafile with its ‘alive’ copy.

After this, when you try to mount your Oracle database, it does not mount. The reason is-

The fundamental reason for unmountability of the database is corruption in datafile. To prevent the corruption of datafile, you should never follow the above steps sequentially.

Resolution:

It is advisable to restore the database from a standby database in order to resolve datafile corruption and to mount your Oracle database. However, if no such database exists, then you will need to repair the database. To effectively do so, you will need to search for a commercial dbf recovery application that can repair your corrupted database.

A repair tool to recover Oracle database and to bring it back to a reusable state can be easily downloaded from the Internet. Such tools can Recover Oracle Database after any logical corruption scenario using powerful recovery algorithms. Moreover, these tools do not make any change in the original database, making them completely non-destructive in nature.

For most of the Oracle database administrators, Oracle Recovery Software is a utility that they use to recover Oracle database after all kinds of logical crashes. The tool supports recovery of Oracle 9i databases. Designed for Windows XP and 2003, the read only software leaves the original database untouched and unmodified.

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