Several MySQL users have reported encountering an error saying, "Incorrect key file for table '/var/tmp/#sql_201e_0.MYI'; try to repair it” while executing a large query in the MySQL workbench. The error usually occurs while selecting or fetching a large number of records from a table using more than one JOIN. This happens when there is some issue with the index key or tables in the MySQL database. In this article, we will discuss the ways to resolve the MySQL database error Incorrect key file for table.
Causes of MySQL Database Error “Incorrect Key File for Table”
There are various reasons and causes that can lead to the ‘Incorrect key file for table’ error in the MySQL Server. Below are some common ones:
Corruption in the index key
Insufficient disk space on the system hosting MySQL Server
Tables in MySQL database are corrupted or damaged
Insufficient space in the temporary folder (/Tmp)
Methods to Resolve MySQL Database Error “Incorrect Key File for Table”
Here are some methods you can follow to resolve this error.
Method 1: Change the Location of Temporary (/tmp) Folder
MySQL uses the temporary directory (/tmp folder) to handle large queries and other operations. If the drive on which this temp directory is saved has limited space, then you may encounter the incorrect key file for table when executing large queries. To resolve this, you can try moving the /tmp folder to another drive, having enough storage space. To check the storage space on a drive on a Windows system, right-click on the drive and then click Properties.
On the Properties page, you can check free space. If the space is low, then free-up some space on the drive by deleting some unwanted files. If this is not possible, then move the temporary folder to another drive.
If you're using the Linux operating system, then you can use the dl command (df –h) to check disk space. If the disk is full, clear the temp files using the following command:
Note: This Linux command removes the unnecessary packages that were downloaded with uninstalled programs.
sudo apt-get autoremove
You can also use the OPTIMIZE command as given below to defragment table to free-up the space.
mysql> OPTIMIZE TABLE tbl_name;
Method 2: Recreate Corrupted Table
The MySQL error 'Incorrect key file for table' can also occur when the MyISAM tables are damaged or corrupted. In such a case, you can resolve the issue by dropping and recreating the corrupt tables, and then re-inserting the data. Follow the below steps to do this:
First, drop the corrupt table and then with the same table schema, recreate the table. You can use the CREATE TABLE command to do this (see the below example).
sql
DROP TABLE tbl_name;
CREATE TABLE tbl_name (...);
Next, use the INSERT command to insert the data into the new table.
If you fail to re-insert the data from corrupted table, then try restoring it from the backup file using the mysqldump command. If the backup is not available, then use the REPAIR TABLE command to repair the corrupt MyISAM table. Here is the command:
Mysqlcheck --repair --databases db_name
Alternatively, you can use the myisamchk command to repair the corrupt MyISAM table. Here’s the command:
Note: Before running the command, stop the MySQL Server.
myisamchk –recover TABLE
When the command is successfully executed, restart the MySQL Server.
Method 3: Use a Professional MySQL Repair Tool
To repair the corrupt tables quickly and safely without any data loss, you can use an advanced MySQL database repair tool, like Stellar Repair for MySQL. It can repair MySQL database created in InnoDB or MyISAM storage engine. It can recover all the objects, including tables, keys, views, data types, and others from the damaged MySQL database. It can save the repaired MySQL database file in a new database file by maintaining the original folder structure. Plus, you can save the repaired data in several other file formats, such as MariaDB, SQL Script, CSV, HTML, and XLS. The tool supports both Windows and Linux operating systems.
Conclusion
By applying the above methods, you can resolve the MySQL database error 'Incorrect key file for table.' However, if corruption in MyISAM tables and indexes is the reason behind this error, then use a professional MySQL database repair tool, like Stellar Repair for MySQL. It is an easy-to-use tool that can help you resolve all corruption-related errors in MySQL. The tool can repair both InnoDB and MyISAM tables. Powered by advanced repair algorithms, this tool can help you fix severe MySQL database file corruption. It helps you quickly and effectively recover all the data, including deleted indexes and tables, from corrupted database files. The tool supports all versions of MySQL and MariaDB.
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