How to Recover MySQL Database? Complete Solution

Summary: Working on databases is indeed a task that requires attention and accuracy, as one wrong operation can harm the data. Sometimes, certain scenarios lead to database corruption, stopping users from accessing the files and data. Here, we discuss MySQL corruption and the methods to recover MySQL database. You will also find out about a professional DatabaseFileRecovery MySQL Database Recovery Tool to resolve the issue and retrieve data securely.
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What Causes MySQL Database Corruption?

MySQL is a relational database that organises data into relations (tables). It stores large volumes of important organisational data. However, there is no limit to corruption; it can happen anytime. So, it is necessary to understand the reasons for corruption to repair corrupted MySQL database. All the cases are stated below:

• Bugs in the software or hardware issues are a prominent cause of corruption.
• It can also occur due to overfilled storage space on the hard disc.
• Sudden power failures or interrupted networks are a factor as well.
• An interruption in the MySQL process or sudden termination of the program.
• Viruses or threats infect the system hosting MySQL database.
• Unexpected factors, hard disc issues, etc., all result in MySQL corruption.

Best Approaches to Recover MySQL Database

There are possibly two solutions in case you face a database corruption in MySQL. Either you can choose to resolve it manually or professionally. But with the manual method, you have to face some consequences and challenges. Get to know about it briefly in the upcoming part of this section. 

Manual Method to Recover Corrupted MySQL Database

This section has two different solutions, and both of them are performed by executing queries. Follow the methods carefully as given here:

Method 1: Eliminate Corrupted Database Errors using mysqlcheck Command

In this, run the following commands to check the table in the database and then repair it:

mysqlcheck name db   //Check Database mysqlcheck name db name_table    // Check Specific Table mysqlcheck –r name db name_table    // Repair Specific Table mysqlcheck –repair –all-db       //Repair Complete Database

Method 2: Repair MySQL Database by Rebuilding Database

The method is divided into two subsequent sections for InnoDB and MyISAM storage engines.

For InnoDB:

1. Open the run window with Win + R and type services.msc.
2. Browse for MySQL Service, select and right-click it, and press Restart.
3. Further, run the command InnoDB_force_recovery to start the service.
4. Next, to enable the above command, look for the my.conf file (configuration file).
5. Once you find the file, go to the MySQL section and run these queries:

[mysqld]  InnoDB_force_recovery = 1  service mysql restart

1. Then, save the MySQL configuration file and restart the service.
2. Afterward, run the command below to dump the MySQL data:

mysqldump -u user -p name db name_table > single_dbtable_dump.sql

1. Subsequently, run the command given to export all databases to the dump.sql file:

mysqldump –all-dbs –add-drop-db –add-drop-table > dump.sql

1. Later, restart the MySQL database and execute the DROP Database command.  
2. If this doesn’t work, then execute the command mentioned here:

cd /var/lib/mysql  rm -rf name db

1. Furthermore, disable the recovery mode by commenting on this line with the command #innodb_force_recovery=…
2. In the end, simply save the changes in the my.conf file and restart the MySQL server to recover MySQL database.

For MyISAM: 

In this, close the MySQL Server first and then run the below commands to check for corruption and recover it.

myisamchk TABLE_NAME   // check for corruption in MyISAM table myisamchk –recover TABLE_NAME,  //fix corruption

Drawbacks of the Manual Method

Although the manual method is cost-free, it has some shortcomings that make it a less preferable solution. These are:

• Users must have technical knowledge and a grip on MySQL commands.
• The method is lengthy, complicated, and time-consuming all at once.
• There are chances you may end up losing all the data or result in even more severe corruption.

Therefore, it is better to go for a professional solution, tested and verified by experts.

Expert Solution to Recover MySQL Database

Using the DatabaseFileRecovery MySQL Database Recovery Tool, you can easily restore damaged or corrupted MySQL databases with ease. It is an efficient utility to fix all kinds of database objects for both InnoDB and MyISAM tables. Additionally, the tool is easy to operate for all users, even without technical knowledge. It runs smoothly on all Windows OS versions and recover MySQL table is marked as crashed error and other issues. Moreover, the tool provides multiple options to save the recovered database safely without any losses. Find the step-by-step procedure for the tool’s working below.

How the Tool Helps Recover Corrupted MySQL Database?

Follow the steps below to resolve the issue and recover data:

1. Run the MySQL Database Repair Tool and click Open to upload files.
2. Press OK and click Yes to add the Ibdata1 file to the tool’s window.
3. Further, browse the Ibdata1 file from the system and add it to the tool.
4. After that, the software begins scanning and displays a preview of the folders.
5. Select the folders from the panel and click Save to restore.
6. Later, select Save as Database or Scripts and provide details. At last, hit OK.

Also Read: MySQL Table is Marked as Crashed.

Conclusion

To summarise, the blog described MySQL and the reasons for its corruption. Then, it stated various methods to recover MySQL database. However, the manual method is tricky and assures no guaranteed results. Also, users need high technical knowledge for it. So, use a professional tool to safely recover the database from your MySQL tables if they get damaged or corrupted. 

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