Fatal Error: Can't Open and Lock Privilege Tables: Table 'mysql.host' Doesn't Exist
November 13, 2023
When MySQL cannot find the
mysql.host table, a crucial component for managing user privileges, this error occurs. It often signifies a missing or corrupt MySQL installation, affecting database access and security. This guide covers how to resolve the issue.
Understanding the Error
This error suggests MySQL's system tables, essential for operation, are inaccessible or absent. These tables store user privileges, crucial for secure database operations. Their absence can halt MySQL functionality.
Verifying MySQL Installation
Ensure MySQL is correctly installed. Use your system's package manager to check installation integrity. For example, on Debian-based systems:
Locating the Data Directory
Find MySQL's data directory, where system tables reside. The default location varies by installation method and operating system. Locate it in the MySQL configuration file (typically
Checking for System Tables
Inspect the data directory for the presence of system tables. List files in the MySQL data directory:
host.MYI are missing, system tables need restoration.
Restoring System Tables
Recreate missing system tables using the
mysql_install_db tool. This creates default system tables without affecting existing databases.
/var/lib/mysql with your actual data directory path.
Repairing Corrupt Tables
If system tables exist but are corrupt, repair them using the
Reset permissions to ensure system table integrity. Start MySQL with skip-grant-tables:
Then, reset permissions:
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