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Summary: You may experience InnoDB table corruption due to MySQL Server crash, hardware failure or bugs, etc. This blog will talk about corrupted database table in MySQL and what causes it. Also, it will outline best ways to repair InnoDB table corruption in MySQL and some best practices you can follow to prevent InnoDB from getting corrupted.
IMPORTANT! Repairing corrupted table manually may work, but it involves the risk of data loss. If you cannot risk losing data, try restoring the database from a recent database backup. However, if the backup is not the most recent backup, you may lose even more data. You can avoid data loss risk when repairing corrupt InnoDB tables (or MyISAM tables) by using Stellar Repair for MySQL software. It helps recover data from corrupt or damaged tables in the original format in just a few clicks.
InnoDB is MySQL storage engine used by default in MySQL 5.5 and later versions. It is also known as a crash-safe storage engine (as opposed to MyISAM), owing to its ability to recover data after crash. However, under some circumstances, it appears that InnoDB table can get corrupted. When this happens, data held within the table becomes unreadable. Also, a corrupt table can cause InnoDB file corruption.
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Some reasons that may result in corrupted table are as follows:
You may encounter InnoDB table corruption issue more frequently on Windows OS while the database runs in a virtualized environment. Now, let’s discuss how to diagnose & repair InnoDB table in MySQL.
Try identifying precisely what you’re dealing with. Doing so, will help you troubleshoot InnoDB issue in a more efficient manner without wasting time looking for alternate methods.
To diagnose InnoDB issues, perform the following:
1. Analyze MySQL Server Log
If you suspect or find corruption in InnoDB tables, examine the MySQL Server error log to find relevant information about specific InnoDB errors. The error log will help you understand:
2. Check Table for Errors
While checking MySQL error log can help you identify corruption, you may have problem identifying, which table was affected by it. You can check InnoDB table for errors by using two methods. However, which method can be used here depends on whether MySQL Server is running or it is offline/crashed.
mysql> CHECK TABLE table_name;
shell> innochecksum [options] file_name
InnoDB comes with a crash recovery mechanism that helps repair and recover db table from crashes automatically. Also, you can use the ‘Dump and Reload’ method to rebuild one or more corrupted tables. However, in case of severe corruption, you may find it difficult to restart the MySQL server. And so, you will need to manually fix InnoDB file in MySQL that has the corrupt table.
Note: Before attempting to repair InnoDB file corruption caused due to a corrupt table, perform recovery from a recent backup. If the backup copy is corrupt or it is not the most recent copy, follow the steps discussed below.
Also Read: How to Repair MySQL Database Table Without Downtime?
Follow a step-by-step procedure to fix corrupted InnoDB table
Note: Make sure to back up the InnoDB file before performing the repair procedure to avoid further damage to table data.
Step 1: Attempt to restart the MySQL service and check if you can access the server. To do so, follow these steps:
If you cannot access the Server, forcing InnoDB recovery may help. For this, enable ‘innodb_force_recovery’ option in MySQL my.cnf configuration file by performing the following:
[mysqld]
section, add the following line:[mysqld]
innodb_force_recovery=1
mysqldump
command:mysqldump -u user -p database_name table_name > single_dbtable_dump.sql
You can dump several tables separated by whitespace in the above command.
mysql -u user -p –execute=”DROP TABLE database_name.table_name”
mysql -u user -p < single_dbtable_dump.sql
Step 2: Stop the MySQL service, and then disable InnoDB recovery mode. For this, enter the following line in the [mysqld] section:
#innodb_force_recovery=…
Step 3: Save the changes to the my.cnf file and restart the MySQL service by using the following command:
service mysqld start
Restore the database table from the dump (i.e. backup file) that you just created.
If you find any difficulty while manually repairing InnoDB tables of MySQL database or any of the database components appears missing, you can try MySQL repair software to repair and restore corrupt InnoDB tables.
Manually repairing corrupt InnoDB table may result in data loss. So, if you cannot risk losing data, use Stellar Repair for MySQL software to repair InnoDB table corruption in MySQL. The software helps fix corrupt database table and recovers table properties, relationship constraints and keys.
Once you’ve fixed InnoDB file corruption, follow these best practices to prevent InnoDB corruption.
Problem solver and Data recovery specialist. Usually share informative articles on data recovery, database corruption and ways to recover lost data.
Thank you so much, your effort is appreciable. I tried to rebuilt InnoDB database after database crash but, I was unable to do it. Stellar Repair for MySQL repaired my corrupt ibdata1 file.
Hi Jason, Thanks for your feedback.
We can’t go for manual crash recovery in MySQL InnoDB Table Corruption. We are actually looking for an instant solution with 100% guarantee.
Hi,
If you are struggling with the inaccessible database file, then try Stellar Repair for MySQL.
Hello Jyoti,
The MySQL is not starting, how can I restore the database?
Hello Mike,
I will suggest you check the error log to know the main reason behind this issue. For this, you need a root access to the server where MySQL is running.
Hi,
I found corruption in an InnoDB table. I stopped the application and created a new table like the old table. Enter all the data from corrupt table to new table and truncate the old table. This method didn’t work for me. In this case, the MySQL repair software helped me to fix the table issue. Thanks you so much!
Hello,
I had server side issue which I detected after checking the three steps that you have shared in “Determine if the Server Supports InnoDB” heading. Thank you so much!
Thanks for the article,
After spending 5 hours to search the solution, I purchased the MySQL repair software from the given link. As I am working in Windows platform so this is the best option for me.
Thank you, Jyoti, I have the same issue as Robert J. and your answer helped me.
Regards,
Blake
I don’t know what is the reason behind corruption. I am getting only an error message “InnoDB: Database page corruption on disk or a failed” and a suggestion to recover the file from backup. Is Stellar Repair for MySQL software capable of fixing this error?
Hi Robert,
Yes, Stellar Repair for MySQL can fix this problem. You can try the demo version of this software from here.
Good Luck!
Hi Jyoti,
Read the complete post and tried all the options to repair my table but no one worked for me. At last, I purchased the tool that you have suggested in the blog and fixed the error successfully.
I searched various Google results and tried two other options to fix the problem. Finally, I tried Stellar Repair for MySQL. It also provides me the preview of my corrupt data.