MySQL · December 20, 2023

How to Fix MySQL Error 1258 - SQLSTATE: HY000 (ER_ZLIB_Z_BUF_ERROR) ZLIB: Not enough room in the output buffer (probably, length of uncompressed data was corrupted)

How to Fix MySQL Error 1258 - SQLSTATE: HY000 (ER_ZLIB_Z_BUF_ERROR) ZLIB: Not enough room in the output buffer (probably, length of uncompressed data was corrupted)

MySQL is a popular open-source relational database management system used by many websites and applications. However, like any software, it can encounter errors that can disrupt its normal operation. One such error is MySQL Error 1258, also known as SQLSTATE: HY000 (ER_ZLIB_Z_BUF_ERROR) ZLIB: Not enough room in the output buffer (probably, length of uncompressed data was corrupted). This error can occur due to various reasons, but fortunately, there are several steps you can take to fix it.

Understanding the Error

MySQL Error 1258 is related to the ZLIB compression library, which MySQL uses for compressing and decompressing data. When this error occurs, it means that there is not enough room in the output buffer for the uncompressed data, possibly due to corruption in the length of the uncompressed data.

Possible Causes of the Error

There are several potential causes for MySQL Error 1258:

  • Insufficient memory: If your server does not have enough memory available, it can lead to this error. Make sure you have enough memory allocated to MySQL.
  • Corrupted data: If the data being compressed or decompressed is corrupted, it can trigger this error. Check for any data corruption issues.
  • Incorrect configuration: Incorrect configuration settings in MySQL can also cause this error. Review your MySQL configuration files to ensure they are set up correctly.

Fixing MySQL Error 1258

Here are some steps you can take to fix MySQL Error 1258:

1. Increase Memory Allocation

If the error is caused by insufficient memory, you can try increasing the memory allocation for MySQL. This can be done by modifying the MySQL configuration file (usually my.cnf or my.ini) and adjusting the values for the innodb_buffer_pool_size and innodb_log_file_size parameters. Restart MySQL after making the changes.

[mysqld]
innodb_buffer_pool_size = 1G
innodb_log_file_size = 256M

2. Check for Data Corruption

If the error is caused by corrupted data, you should check your database for any corruption issues. MySQL provides tools such as mysqlcheck and myisamchk to help you identify and repair corrupted tables. Run these tools on your database to fix any corruption problems.

3. Verify Configuration Settings

Incorrect configuration settings can also trigger this error. Review your MySQL configuration files and ensure that the settings are correct. Pay special attention to any compression-related settings, such as innodb_compression_algorithm and innodb_compression_level. Make any necessary adjustments and restart MySQL.

4. Upgrade MySQL

If you are using an older version of MySQL, it is possible that the error is a known bug that has been fixed in a newer version. Consider upgrading to the latest stable release of MySQL to see if it resolves the issue.

Summary

MySQL Error 1258 - SQLSTATE: HY000 (ER_ZLIB_Z_BUF_ERROR) ZLIB: Not enough room in the output buffer (probably, length of uncompressed data was corrupted) can be a frustrating issue to encounter. However, by following the steps outlined above, you can resolve this error and get your MySQL database back up and running smoothly.

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