How do you identify InnoDB table corruption?

Published by Jacob Martin on December 26, 2013

MySQL is a commonly used RDBMS (Relational Database Management Systems). Users love to work with as it provides amazing feature for both small and big firms. It has a two main storage engine to keep your important data InnoDB and MyISAM. It is a part of fast growing LAMP (Linux, MySQL, and Apache). Due to its extensive use it sometime gets corrupted that lead to data loss. InnoDB is a storage engine of MySQL which is later used by default. It also support foreign key (Declarative Referential Integrity). It contains a standard in almost every binary distributed by the MySQL AB. It is also known to have a crash-recovery abilities and therefore it is known as crash safe storage engine as compared to MyISAM. It is a very trustworthiness and gives high performance storage engine for MySQL. It arrange you data on the disk to optimize the general question based on primary key. Each table has a unique primary key index which is known as clusters index that arrange the data to minimize the look. The table is fully supported ACID compliant transaction and is very optional for presentation. It also supports commit, roll, rollback, foreign keys etc.

It is portable between different OS and platforms. But sometime it is found that InnoDB pages might corrupt during the crash and at situation we need a manual crash recovery tool to repair it. Just take a live example: You have a database that has InnoDB table and one of the table is marked as corrupt or you found that the data is missing. Though you tried to restart MySQL it didn’t crash. Actually you expected it to crash but it didn’t crash. (Somewhere you have read that if InnoDB table is corrupted MySQL server will stop). Causes behind InnoDB table corruption: Mainly InnoDB table corrupts due to hardware related issues. Corrupted pages are due to bad memory or power failure. The issue can be due to (NAS) network attached storage and allotting InnoDB database in it. The corrupt table doesn’t automatically cause crash. You need to repair the table and if doable reload the table from the backup. Operation done on a corrupt table is blistering it might not give you a correct result. If you want to recover the data from InnoDB table then stop using it.

Table corruption is common for MySQL user that take another example while you are running InnoDB table and you got a driver bug, crappie hardware, power failure or some bug and due to which few pages got corrupted at this situation you will get an error message like: Disk failure, Database page corruption and it crash with allegation failure. So do you have any way to recover such type of tables? If you look in detail there are multiple things that can corrupt so if you go on deep you can see that when a page in the clustered key index is corrupted it is the worst situation as compared to a data corruption but this situation is harder to repair. When an InnoDB storage engine fails to initialize you cannot easily identify the problems and the table gets corrupted until you get the error message. To get back your precious data from the corrupted tables you need to take necessary steps. If you are sure that you table is corrupted then you need to take a necessary step to repair it. As you important data are stored in it.

To recover the corrupt table you need a powerful, professional software. MySQL Repair Tool that can easily recover any type of corruption in MySQL database. It can easily recover data and table structure. It is quick, easy and safe to use with its data scanning algorithms top make sure total recovery. It repairs and restores table, data type and the other database object of both the MyISAM and InnoDB storage engines. It supports every versions of MySQL such as 5.x, 3.x, 1.x, 4.x or 2.x that is available for all the present platforms that consist of Windows 95/ 98/XP/2000/2003 servers. The best thing about this repair tool is that it doesn’t require any technical knowledge so now a non technical person can easily operate it without anyone’s help.