MySQL · December 20, 2023

How to Fix MySQL Error 1191 - SQLSTATE: HY000 (ER_FT_MATCHING_KEY_NOT_FOUND) Can't find FULLTEXT index matching the column list

How to Fix MySQL Error 1191 - SQLSTATE: HY000 (ER_FT_MATCHING_KEY_NOT_FOUND) Can't find FULLTEXT index matching the column list

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 1191 - SQLSTATE: HY000 (ER_FT_MATCHING_KEY_NOT_FOUND) which occurs when MySQL can't find a FULLTEXT index matching the column list. In this article, we will explore the causes of this error and provide solutions to fix it.

Understanding the Error

When you encounter MySQL Error 1191, it means that you are trying to perform a full-text search on a table that doesn't have a FULLTEXT index matching the column list specified in the query. The error message will typically look like this:

ERROR 1191 (HY000): Can't find FULLTEXT index matching the column list

This error can occur when you use the MATCH() function in your query to perform a full-text search on one or more columns that don't have a FULLTEXT index defined.

Causes of MySQL Error 1191

There are several possible causes for MySQL Error 1191:

  • Missing FULLTEXT Index: The most common cause is that the table you are trying to search doesn't have a FULLTEXT index defined on the columns specified in the query.
  • Incorrect Column Names: Another possible cause is that you have misspelled the column names in the MATCH() function, or the column names don't exist in the table.
  • Unsupported Storage Engine: MySQL's full-text search feature requires the use of certain storage engines, such as MyISAM or InnoDB with the FULLTEXT index support enabled. If you are using a different storage engine or the support is not enabled, you may encounter this error.

Fixing MySQL Error 1191

To fix MySQL Error 1191, you can follow these steps:

1. Check for FULLTEXT Index

First, verify that the table you are trying to search has a FULLTEXT index defined on the columns specified in the query. You can use the following command to check the table's structure:

SHOW CREATE TABLE table_name;

If the table doesn't have a FULLTEXT index, you can add it using the ALTER TABLE statement:

ALTER TABLE table_name ADD FULLTEXT(column_name);

Replace table_name with the actual name of your table and column_name with the name of the column you want to include in the FULLTEXT index.

2. Verify Column Names

Double-check the column names specified in the MATCH() function. Make sure they are spelled correctly and exist in the table. If you made any changes to the table structure, ensure that the column names are updated accordingly.

3. Check Storage Engine and Index Support

Confirm that you are using a storage engine that supports full-text indexing, such as MyISAM or InnoDB with the FULLTEXT index support enabled. You can check the storage engine of a table using the following command:

SHOW TABLE STATUS LIKE 'table_name';

If the storage engine doesn't support full-text indexing or the support is not enabled, you may need to switch to a compatible storage engine or enable the necessary support.

Summary

MySQL Error 1191 - SQLSTATE: HY000 (ER_FT_MATCHING_KEY_NOT_FOUND) occurs when MySQL can't find a FULLTEXT index matching the column list specified in the query. This error can be caused by a missing FULLTEXT index, incorrect column names, or an unsupported storage engine. To fix the error, you can add the missing FULLTEXT index, verify the column names, and ensure that you are using a compatible storage engine with full-text index support.

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