Monday, April 11, 2011

Database Corruption Due to Incorrect Up-Gradation of MySQL Server and the Possible Resolution

MySQL was developed realizing the need for an advanced database management system that could efficiently handle much bigger databases. Today, it is widely used in various large scale projects and applications. It is an open source database that is mostly used for developing web applications. It includes several distinguished features, such as meta-data locking within transactions, crash recovery, foreign key support etc. which make it a highly reliable and user-friendly database management system.

But users have faced various corruption issues while working with MySQL databases. The possible reasons behind database corruption are improper shutdown of the application, virus attacks, hardware failures etc. Sometimes, corruption can also occur while you try to upgrade your MySQL server to higher versions. Due to this corruption, you may not be able to access any database objects and tables stored in your database. To overcome this problem, you need to go for MySQL recovery through a reliable third-party utility.

For instance, you may receive the following error message while trying to upgrade the MySQL server running on InnoDB engine to MySQL 5.0.27:

"#1033 - Incorrect information in file 'file_name"

Cause: An improper or incomplete update of the MySQL server has resulted in the corruption of some InnoDB tables.

Corruption in some database tables may prevent you from accessing the whole MySQL database. Here, you can use an updated backup to recover database. In case, an updated backup of the database is not available, you should follow the below mentioned resolution steps.

Resolution: You may try these steps to resolve the above error-

Use the check table utility that will help to easily detect corruption and fix the structure of any corrupt InnoDB table.orc

You can also run innodb_force_recovery=4 command

If both the resolution steps fail to solve the problem, you should take help of an efficient MySQL database recovery software. These software repair corrupt database tables created in both InnoDB and MyISAM database engines. They are capable of recovering all the MySQL database components including tables, keys, constraints, views etc. They can also recover data from tables on which auto-increment properties are applied.

Stellar Phoenix MySQL Database Recovery is a comprehensive utility that repairs corrupt MySQL tables created in MySQL 3.x, 4.x, 5.x, and 6.x versions. It continuously writes a log of the recovery process to keep track of the changes made to the database. It compatible with Windows 7, Vista, Server 2003, XP, and 2000.

For more details about how to recover MySQL database visit this: http://www.mysql-database-recovery.com/

Article Source: http://EzineArticles.com/?expert=Mark_Willium

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