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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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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Storing SQL Server Database on Network Server May Cause Corruption

Microsoft usually urges that you should use a SAN (Storage Area Network) or locally attached hard drive to store MS SQL Server database (MDF) files as this configuration improves SQL Server reliability and performance. Use of network database (stored on network server or NAS [Network Attached Server]) is disabled by default in Microsoft SQL Server. In order to ensure complete data safety and to prevent need of SQL Database Recovery, you should not use SQL database on networked server.

Though, it is not recommended, but it is possible to configure MS SQL Server for storing the database on a NAS storage server or networked server. Data storage servers, that are employed to store MDF database, must meet the SQL needs for 'write-through guarantees' and 'data write ordering'.

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If you try to create SQL database file on UNC or mapped network location results into any of the below error message:

Storing SQL Server Database on Network Server May Cause Corruption

5105 "Device Activation Error"

Or

5110 "File 'file_name' is on a network device not supported for database files."

The above behavior is quite expected. The trace flag 1807 let you to bypass the check process and enables you to configure MS SQL Server with the networked database files. Microsoft SQL Server and various other relational database management systems use the transaction log and associated recovery logic, that ensure database integrity and consistency in case of system failure or improper system shutdown.

These SQL Server Recovery protocols bank on the capability to write instantly on the hard drive media so that if any operating system I/O (Input/Output) write call returns to database manage, recovery system is assured that write operation is really complete or the completion of write process can be ensured. Any type of failure by any hardware or software components of this protocol may result in complete or partial data loss due to corruption of MDF file.

In such critical circumstances, you need to restore the damaged database from the most recent backup. However, if the backup is either not available or not updated, third-party MS SQL Recovery software is the only way to go.

The MS SQL Recovery applications are powerful enough to carry out in-depth scan of entire SQL Server database and extract all inaccessible database objects. With the read-only and simple graphical user interface, they are completely safe and easy to use.

SQL Recovery is the most prominent tool that enables absolute recovery in all cases of MDF corruption. It restores all database objects such as tables, reports, forms, modules, queries, constraints, stored procedures, and triggers. The software is compatible with MS SQL Server 2008, 2005, and 2000.

Storing SQL Server Database on Network Server May Cause Corruption

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MySQL Database Inaccessible Post MySQLD Crash

MySQLD - MySQL Server - is an important program that provides you the access to data directory that consists of all databases and tables. The default location for MySQLD.exe is saved at "C: Program Files". Whenever MySQLD starts, it hears to all network connections from client programs and then manages all the databases on clients behalf. Improper or unexpected shutdown of MySQLD might result in complete or partial corruption of your database. In such situations, the records saved in your MySQL database become inaccessible. For systematic access of records, a standard way is to restore them from an updated backup. But if in case the backup is not available or backup falls short to restore the required data, then you will need to search for effective third party database repair applications.

Consider a practical scenario, where MySQL unexpectedly quits and your database gets corrupt. Unexpected shutdown can occur due to various reasons, like human error, power surge, hardware malfunction, or software bugs. On viewing the log, you view the below information:

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"101106 0:15:19 - mysqld got exception 0xc0000005; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail."

MySQL Database Inaccessible Post MySQLD Crash

Note: In most cases, your database becomes unmountable after corruption.

Resolution

A comprehensive solution to repair corrupted database, in case of no backup availability is mysql database recovery application. These MySQL Repair applications are non-destructive in nature and perform repair without making any changes in the original file. Such repair tools are built with interactive user-interface, which makes them easy to understand without any former technical understanding. These tools use high-end scanning procedures to orderly scan and repair MySQL database.

The mysql database repair utility repairs and restores databases built in MyISAM and InnoDB database storage engines. The MySQL Repair software is compatible with Windows Vista, XP, 2003 and 2000 operating systems. Its demo version provides a complete preview of the recoverable data.

MySQL Database Inaccessible Post MySQLD Crash

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