MySQL is a free open-source RDMS (Relational Database Management System). It is generally used for data warehousing, web applications & e-commerce. Moreover, it supports numerous platforms like Windows, Linux, & UNIX.
Despite having numerous excellent features still some users are facing MySQL database corruption & downtime. It mainly happens due to table corruption. Though repairing MySQL database tables takes a lot of time, which increases business downtime & causes inconvenience to users.
Fortunately, there are a few effective solutions available to repair MySQL database without downtime. In this write-up, we’ve discussed all the possible solutions to fix the MySQL database in no time.
But before we proceed, let’s know something about downtime…
Table of Contents
What Is Downtime in MySQL?
In MySQL, downtime states the period when the MySQL server is not operational or unavailable. At this time, users & applications might unable to access or relate with MySQL database.
Although, downtime can occur due to various reasons like, system maintenance or upgrades, hardware/software failures, network outages, etc.
So, as you have known about the downtime now, let’s proceed to repair MySQL database without downtime
Methods to Repair Corrupt MySQL Database without Downtime
In this section, we have discussed both the manual as well as automatic methods to get rid of MySQL database corruption.
Method 1- Using MySQL Repair Tool (mysqlcheck)
The very first method that you should try to fix MySQL database without downtime is “mysqlcheck” tool. This command-line utility used to check & repair the database effortlessly.
Though here you can run the below “mysqlcheck” command in command prompt or terminal window & repair a corrupt database:
mysqlcheck –auto-repair -u root -p [databasename]
Performing the above mysqlcheck command will start checking the tables’ line-by-line & showing OK option at the end. Just like shown below:
[email protected]:/$ mysqlcheck –auto-repair -o –all-databases -uroot -p
Enter password:
mydb.accounting_table1 OK
mydb.accounting_table2 OK
mydb.accounting_table3 OK
mydb.accounting_table4 OK
Please Note: mysqlcheck might hang while checking & repairing the large database corruption. Also, don’t forget to back up your vital MySQL database files to avoid any data loss.
Method 2- Using MySQL Dump and Restore
Another feasible way that you can try is the mysqldump command.
The mysqldump command is generally used to back up one or more than one database and restore the database from MySQL dump file.
How to Back Up MySQL Database?
To Back Up Single DB:
In case, if you want to back up a single db, run the below mysqldump command:
‘mysqldump -u root -p db_name > dump.sql’
Nevertheless, if you’re already logged in to the server, you don’t need to enter a root password.
In such a case, you can run the below mysqldump command:
‘mysqldump db_name > dump.sql’
To Back Up Specific MySQL DB:
If you want to back up a few specific databases, you have to run the below mysqldump command:
‘mysqldump -u root –p –databases db1 db2 > dump.sql’
To Back Up All the MySQL Databases:
In order to back up all the MySQL databases, you can use the option “–all-databases” as shown in the below command:
‘mysqldump -u root -p –all-databases > dump.sql’
So, once you have created a backup of dump file, now let’s try to perform MySQL recovery from that dump file.
How to Restore the MySQL Dump?
In order to restore MySQL DB using the mysqldump, you will have to first make an empty database & then follow the below steps:
Step 1- Drop & recreate your db.
‘mysql > drop db_name
mysql > create db_name’
Step 2- Now, run the below command to restore the db:
‘mysql -u root -p db_name < dump.sql’
That’s it.
Method 3- Use Stellar Repair for MySQL to Repair MySQL Database
If you’re looking for a quick way to repair corrupted MySQL database without downtime, consider using the recommended database repair tool such as Stellar Repair for MySQL.
This feature-loaded software not only repairs the severely corrupted MySQL databases but also helps in performing MySQL database recovery with ease.
Key features of this tool:
- Fixes the relations, forms, tables, primary keys, and unique keys.
- Effectively repairs corrupted Maria DB and MySQL databases.
- Supports various formats like CSV, HTML, SQL Script, XLS, etc.
- GUI interface
- 100% secure & easy to use tool.
So, simply download & install Stellar Repair for MySQL program on your PC and follow the beneath steps:
Step 1- Run Stellar Repair for MySQL.
Step 2- Next, click on a Browse option >> choose a data folder you need to repair then click on OK option.
Step 3- Here, you’ll get the MySQL database files list, select the corrupt file(s). Click on the Repair button.
Step 4- At this instance, the software displays the progress of the repairing process over the screen.
Step 5- After completion of the database repairing process, one popup box will appear on your screen named “Repair Complete”. Click OK button.
Step 6: Now, here you can preview the fixed database file. Simply go to the File menu and then click Save.
Step 7: After that, select the appropriate file format and provide the significant details to save the repaired file.
Step 8: Once the process gets over, you will get the “Save Complete” dialog box on your screen.
And you are done!
Bottom Line
By following the solutions mentioned above in this article, you can repair MySQL database without downtime. But, the manual methods may take significant time & result in data inconsistency.
Therefore, it is suggested to use the third-party tool- Stellar Repair for MySQL. It has advanced algorithms that can effectively repair corrupt MySQL databases without downtime.
Moreover, it has the ability to repair severely corrupted MyISAM & InnoDB database files along with performing MySQL database recovery from both physical & logical corruption.