How to recover MySQL with corrupted InnoDB files?

How to recover MySQL with corrupted InnoDB files?

InnoDB on MySQL server was corrupted. And it could be solved by removing database files and reload SQL data. Backup InnoDB files (i.e. ib*), I suggests backup whole /var/lib/mysql directory. Adding innodb_force_recovery = 4 to [mysqld] section at MySQL server config file (eg. /etc/mysql/mysql.conf.d/mysqld.cnf in Ubuntu 16.04)

Is there a way to repair the InnoDB table?

However, by using a MySQL database repair tool such as Stellar Repair for MySQL, you can repair tables on the InnoDB storage engine and restore it to its original functional state. This file repair utility helps repair MySQL database created on both Windows and Linux OS.

Can a corrupt table cause an InnoDB file to be unreadable?

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.

What kind of storage engine is InnoDB in MySQL?

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.

Is there any way to repair an InnoDB table?

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. Recovers all the database objects including tables, keys, data types, table properties, triggers, views, etc.

When to use InnoDB Force recovery on a database?

Only use an innodb_force_recovery setting of 4 or greater on a production server instance after you have successfully tested the setting on a separate physical copy of your database. When forcing InnoDB recovery, you should always start with innodb_force_recovery=1 and only increase the value incrementally, as necessary.

What to do in case of InnoDB corruption?

InnoDB corruption can cause all of the databases running on that server to become inaccessible. I have to say what everyone else out there says, “Backup, Backup, and Backup”. Make sure that you maintain a good backup schedule by running a dump script to get your dbs back in order in case of serious corruption or data loss (which is inevitable).

How to force InnoDB storage engine to start up?

In such cases, you can use the innodb_force_recovery option to force the InnoDB storage engine to start up while preventing background operations from running, so that you can dump your tables. For example, you can add the following line to the [mysqld] section of your option file before restarting the server:

How to recover InnoDB table data from ibdata and.frm files?

InnoDB: Error: log file ./ib_logfile0 is of different size 0 50331648 bytes InnoDB: than specified in the .cnf file 0 5242880 bytes! [ERROR] Plugin ‘InnoDB’ init function returned error.

What can I do about corrupted table in MySQL?

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.

How to copy the InnoDB table to datadir?

Copy the .ibd file of the InnoDB table. Then, run this To bring it back later on, copy the .ibd file back into datadir and then run This would have preserved the internal metadata id. Make sure .frm is always present.

What’s the best way to recover from an InnoDB crash?

Besides the flag of innodb_force_recovery, I found another solution: innodb_file_per_table, that splits InnoDB tables in each file like MyISAM tables. In a crash recovery you can lost less data than in single file ibdata1. Thanks for contributing an answer to Stack Overflow!

What to do if you drop MySQL InnoDB database?

Backup the innodb file. Pray that you did NOTHING after you dropped the database. The guys at Percona (includes authors of MySQL Performance Blog) should be able to help you out: Percona emergency support. If you do venture on your own, take this with you: Data Recovery Toolkit for Innodb. The logistics of it?