Power Surge Causes Improper Shutdown and Corruption to MySQL Database

MySQL is a widely-used and advanced relational database management system. It enables you to store your significant data in a reliable database, using either InnoDB or MyISAM storage engines. You can also use MySQL database with any of the project management tools to effectively manage and use your database. However, in some situations, you may come across serious MySQL database corruption, if power failure occurs while using your database with a project management tool. This behavior prevents you to access your valuable data and leads to critical data loss situations. In such critical circumstances, you need to repair MySQL database if there is no valid backup in place.

After improper system shutdown, your InnoDB database of MySQL cannot be opened and accessed. The service fails to start every time. Even the "innodb_force_recovery" fails to fix the problem. The situations may become more critical if you do not have complete backup of the database. In such situations, the following error message appears in the error log of MySQL:

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"InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
100308 14:50:01 InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the.ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
100308 14:50:02 InnoDB: Error: page 7 log sequence number 0 935521175
InnoDB: is in the future! Current system log sequence number 0 933419020.
InnoDB: Your database may be corrupt or you may have copied the InnoDB
InnoDB: tablespace but not the InnoDB log files. See
InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html
InnoDB: for more information.
100308 14:50:02 InnoDB: Error: page 2 log sequence number 0 935517607
InnoDB: is in the future! Current system log sequence number 0 933419020.
InnoDB: Your database may be corrupt or you may have copied the InnoDB
InnoDB: tablespace but not the InnoDB log files."

Power Surge Causes Improper Shutdown and Corruption to MySQL Database

As stated in the above error, the MySQL recovery process fails and database remains unusable.

Cause
The problem generally occurs due to corruption to MySQL database after improper system shutdown. In such cases, MySQL application can not read the database and since the corruption is serious, it ca not even recover the database.

Solution
You can fix the problem by restoring MySQL database from current backup. In case the backup is not available, you have to repair mysql database tables using third-party applications.

The MySQL repair software are powerful enough to thoroughly scan entire database and extract all inaccessible data from it. They have simple user interface and non-destructive conduct to offer easy and secure recovery.

Database Recovery for MySQL software repairs and restores corrupt MySQL database in a quick and absolute way. The mysql repair software works well with MySQL 5.x and 4.x. It supports both InnoDB and MyISAM storage engines of MySQL.

Power Surge Causes Improper Shutdown and Corruption to MySQL Database

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USB Data Recovery and Causes of Data Loss

The reality of data corruption and possible data loss using USB storage devices has removed the idea of invulnerability often associated with USB storage devices at least in the minds of a lot of folks. This has led to the need for USB Data recovery. Some possible causes of data corruption and loss include the following:

Owners of USB storage devices have been found to be one of the major reasons why their data is either corrupted or lost. Mistakes like pressing the delete key or tab on their computer and some other errors are quite common. Well..... no one is above mistakes.

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Another possible reason for requiring USB Data recovery is due to using older operating systems like Windows 2000. Although these operating systems are USB-compatible they do not copy data into your portable flash drive (USB Flash) immediately after such command. Instead, what they do is keep a log of the data transfer and complete this command only when you have removed the storage device using the 'safely remove hardware' wizard.

USB Data Recovery and Causes of Data Loss

To conclude the possible causes of data loss as this is not an exhaustive list, the last cause to be considered is the wear and tear suffered by USB storage devices. Although rugged due to their no-volatile nature portable memory devices are not immune from abuse.

In spite of these causes, solutions are available to help retrieve lost data. They are not in any way exhaustive, but should help prepare the ground for further research. They are:

Information recovery whether it is from USB devices or NTFS-based hard disks are similar in at least one way. They all use software as one of the options available to recover data. They come either as free or commercial software.

The software solutions offered online are usually compatible with NTFS, FAT or not. After carrying out recovery on USB, without yielding any positive result, you can go ahead and try NTFS -specific software; this is for people with Windows NT or similar versions. This data recovery is carried out on your computer to confirm if the data you are looking for is there. Users of non-Windows computer system can carry out a similar search through their computers following the appropriate procedure.

After trying USB Data recovery and NTFS Data recovery, with both not yielding the desired result, you can then contact data recovery professionals. They are available online with different companies offering its own packages. Their fees might be expensive, but should be worth it, if the data in question is very important.

USB Data Recovery and Causes of Data Loss

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Damaged Page Header Causes Database Corruption in SQL Server

Microsoft SQL Server provides you a powerful utility to check the integrity and consistency of both logical and physical components, known as DBCC CHECKDB. The utility checks database integrity in three different phases. In first phase, consistency of allocation structures in hard drive space is checked and integrity of all the database pages and their structures are checked in the second phase.

In third and the last phase, catalog consistency is checked. If the tool encounters any kind of errors in any checking phase, the process gets terminated improperly. After this behavior, SQL Server Database remains in corrupted and inaccessible state. It leads to severe data loss situations and requires SQL Database Recovery to extract inaccessible data, if an updated backup is not in place.

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The DBCC CHECKDB process gets terminated if your Microsoft SQL Server database is severely damaged and it is beyond the repair abilities of the DBCC CHECKDB utility. When the DBCC CHECKDB tool fails to bring your Master Database File (MDF) of Microsoft SQL Server into working state, you may face an error message similar to the following one:

Damaged Page Header Causes Database Corruption in SQL Server

"Table error: Page P_ID allocated to object ID O_ID, index ID I_ID was not seen. Page may be invalid or have incorrect object ID information in its header."

Grounds of the problem

The problem may occur if a page, which is allocated as mentioned, but is not seen with the Index/object ID in header of page. The database page contains different index ID in header. Thus, there is a matching 2534 (a page that is allocated by other object) error for page. You may come across the same problem if your database is damaged and DBCC CHECKDB utility can not read it for checking the integrity.

Resolution

You can try the below steps to perform SQL Server Recovery to fix the issue:

Run hardware diagnostic to detect and fix hardware related problems.
Restore database from recent backup.
Use third party MS SQL Recovery applications to repair and restore damaged database.

The SQL Recovery software enables you to systematically scan the whole database and extract all inaccessible data from it. They have simple graphical user interface to offer easy and quick recovery of damaged database objects.

SQL Recovery software successfully repairs and restores database in all cases of corruption. The software works well with Microsoft SQL Server 2008, 2005, and 2000. It restores all MDF file objects, such as tables, reports, forms, macros, constraints, data types, and more.

Damaged Page Header Causes Database Corruption in SQL Server

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