Error
Error Code:
1533
MySQL Error 1533: Failed to Alter Filegroup
Description
MySQL Error 1533, symbolized as `ER_ALTER_FILEGROUP_FAILED`, indicates that an attempt to modify or alter a filegroup has failed. This error typically occurs in MySQL Cluster (NDB) environments when managing the disk space and data files for tablespaces.
Error Message
Failed to alter: %s
Known Causes
4 known causesInsufficient Disk Space
The disk partition where the filegroup's data files reside has run out of available space, preventing the alteration operation from completing.
Invalid Filegroup Configuration
The `ALTER FILEGROUP` statement contained incorrect parameters, referenced a non-existent path, or the filegroup itself was improperly configured.
File System Permissions
The MySQL server process lacks the necessary read/write permissions for the directories or files associated with the filegroup, hindering modifications.
Corrupted Filegroup Data
Underlying data files or metadata for the filegroup or its associated tablespaces are damaged, causing alteration attempts to fail.
Solutions
4 solutions available1. Verify Filegroup Existence and Permissions easy
Ensure the target filegroup exists and MySQL has the necessary permissions to access its directory.
1
Identify the filegroup name from the error message. The `%s` placeholder in the error message should contain this name.
2
Check if the filegroup exists. If you are using InnoDB with file-per-table or multiple tablespaces, this might refer to a specific tablespace file's directory.
SHOW VARIABLES LIKE 'innodb_file_per_table';3
If `innodb_file_per_table` is ON, and the error relates to altering a table, verify the directory where the `.ibd` file for that table is located. If it's a shared tablespace, check the directory of `ibdata1`.
SHOW VARIABLES LIKE 'innodb_data_home_dir';4
Ensure the MySQL user (the OS user running the MySQL server process) has read, write, and execute permissions on the directory containing the filegroup or tablespace files.
5
Use your operating system's tools to check and adjust permissions. For example, on Linux:
sudo chown -R mysql:mysql /path/to/your/data/directory
sudo chmod -R 755 /path/to/your/data/directory2. Check Disk Space and I/O Operations medium
Confirm sufficient free disk space and investigate potential I/O contention affecting file operations.
1
Check the available disk space on the partition where your MySQL data directory resides.
df -h2
If disk space is low, free up space or expand the storage. MySQL operations, especially those involving filegroup alterations, can require significant temporary space.
3
Monitor disk I/O activity to identify potential bottlenecks. High I/O wait times can cause file operations to fail or time out.
sudo iostat -xz 54
If I/O is a bottleneck, consider optimizing your storage, moving data to faster disks, or reducing the load on the I/O subsystem.
3. Restart MySQL Server easy
A simple restart can sometimes resolve transient file system or resource issues.
1
Gracefully stop the MySQL server.
sudo systemctl stop mysql2
Wait a few moments for the server to fully shut down.
3
Start the MySQL server again.
sudo systemctl start mysql4
After the server restarts, retry the operation that caused the error.
4. Examine MySQL Error Logs for Detailed Clues medium
Consult the MySQL error log for more specific details about the file operation failure.
1
Locate your MySQL error log file. The location is typically defined by the `log_error` variable in your `my.cnf` or `my.ini` configuration file.
SHOW VARIABLES LIKE 'log_error';2
Open the error log file and search for entries around the time the error occurred. Look for messages related to file operations, disk access, or specific file paths.
3
The error log might provide more specific reasons, such as file not found, permission denied, or an underlying OS error code, which can guide further troubleshooting.