Troubleshooting MySQL Error 145 (HY000)

Summary: The MySQL error 145 (HY000) indicates issues within MySQL database tables or host connection failure. In this post, we’ll discuss the solutions to troubleshoot this MySQL error. It also mentions a reliable MySQL repair tool to help you quickly resolve the error by repairing the corrupt database with complete integrity.

You may encounter the “error 145: Table ‘/dbname/tablename’ is marked as crashed and should be repaired,” while accessing the records in the MySQL database. MySQL Server usually throws this error when it fails to read the tables in the database. It indicates corrupted or damaged data in the database. Due to this error, you may fail to access the tables and other data in the database, leading to downtime and service disruption. Below, we will discuss how to resolve the MySQL error 145 (HY000) on both Windows and Linux operating systems. But before that, let’s take a look at the causes behind this MySQL error.

What Causes MySQL Error 145 (HY000)?

The MySQL error 145 indicates corruption in database tables. The tables can get corrupted due to one of the following reasons:

Methods to Fix MySQL Error 145 (HY000)

You can encounter the MySQL error 145(HY000): Table is marked as crashed and should be repaired, while connecting to the MySQL Server. It can occur due to network issues. If there are network connectivity issues, you can troubleshoot the connection problems. If this is not the case, then follow the below methods.

Method 1 – Restore MySQL Database Tables from Backup

The error message itself indicates issues with the MySQL table. If you have created a logical backup of the database using the mysqldump utility, then you can restore the tables from the backup database file.

To identify the crashed table, you can use the below T-SQL query:

SHOW TABLE STATUS;

Search for the table with the “Crashed” status, under the Data_free column.

Once you identify the affected table, you can restore it.

First, create an empty database by using the following command:

‘mysql > create db_name’

Then, use the below command to restore the table from the backup database.

mysql -u root -p db_name < dump.sql --tables table name

If multiple tables are corrupted, then you can restore the entire MySQL database from the backup. Here is the command:

mysql -u root -p db_name < dump.sql

After restore, it is important to check the restored objects in the database. For this, use this command:

‘mysql> use db_name;
mysql > show tables;’

If you’re running MySQL on Linux system, then execute the below command to restore the database from backup:

mysql -u [user] -p [database_name] < [filename].sql

Method 2 – Check and Repair the MySQL Database Table using mysqlcheck Command

If you don’t have an updated backup or your backup file is obsolete, you can use the mysqlcheck command. This command is used to check the tables and repair them if they’re corrupted. It is also used to analyze and optimize the tables. Here’s how to use this command:

mysqlcheck -c database_name table_name
  mysqlcheck --r database_name table_name

Method 3 – Repair MySQL Tables using myisamchk Command

MySQL supports two types of storage engines – MyISAM and InnoDB. If you’re using MyISAM storage engine, then you can use myisamchk command to recover the corrupted table. Here’s how to use this command on the Windows system.

First, you need to stop the MySQL Server. For this, use the below command:

mysqld stop
myisamchk –recover TABLE
mysqld start

If you are running MySQL on Linux system, then follow these steps to repair the tables:

service mysqld stop
service mysql stop
cd /var/lib/mysql
myisamchk table_name
myisamchk *.MYI
myisamchk –recover table

Note:

If you’re using InnoDB storage engine, you can enable the Innodb_force_recovery option to repair the corrupt tables.  

What If Nothing Works?

If the above repair methods fails to repair the MySQL database tables, then you can use  an advanced MySQL database repair tool, like Stellar Repair for MySQL. It can repair corrupt MySQL database, including tables and other objects with complete integrity. It can also help recover deleted records from the corrupted database. The tool allows you to save the repaired data in MySQL, MariaDB, SQL Script, HTML, CSV, and XLS formats. It can help you fix corruption issues in MyISAM and InnoDB tables. The tool supports both Linux and Windows operating systems.

Closure

The error 145 (HY000) in MySQL usually occurs due to corrupt database tables. You can follow the methods discussed above to repair the tables. One of the easiest methods to repair database tables without data loss is to use a professional MySQL repair tool, like Stellar Repair for MySQL. It can fix corrupt MyISAM and InnoDB tables, and restore them to their original state. The tool can help fix complex corruption-related errors in MySQL database, including the error 145. It supports MySQL Server 8.x, 6.x, 5.x, 4.x, and 3.

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