What are the methods for optimizing full-text indexes in MySQL?

There are several methods to optimize the full-text index in MySQL.

1. Choose the appropriate full-text index type: MySQL offers various full-text index types, such as the FULLTEXT index of the MyISAM engine and the full-text search plugin of the InnoDB engine. Select the appropriate full-text index type based on specific requirements to achieve better performance and functionality.
2. Choose the appropriate tokenizer: Full-text indexing requires using a tokenizer to break down text into words before creating an index. Choosing the right tokenizer can improve the accuracy and search effectiveness of full-text indexing.
3. Optimize the fields for full-text indexing: when creating a full-text index, only select the fields that need to be searched in full text, avoid indexing fields that do not need full-text searching in order to improve performance.
4. Reasonably set the minimum word length for full-text indexing: By default, MySQL full-text indexing does not index words that are too short. Depending on the situation, you can adjust the minimum word length parameter for full-text indexing to improve the accuracy and effectiveness of the indexing.
5. Utilize Boolean mode searching: MySQL’s full-text index supports Boolean mode searching, allowing the use of boolean operators (AND, OR, NOT) to combine multiple keywords for searching. By using Boolean mode searching, you can more precisely match search criteria and improve search performance.
6. Avoid using wildcard searches: Utilizing wildcards (such as using %) can prevent the full-text index from being utilized, thus decreasing search efficiency. It is recommended to refrain from using wildcards in full-text index searches and instead consider using prefix searches or other alternatives.
7. Avoid sorting with full-text indexes: Full-text indexes themselves do not support sorting. If you need to sort full-text search results, you can achieve it using other methods such as keyword frequency.
8. Regularly optimizing full-text indexes can improve the efficiency and performance of searches. You can use the OPTIMIZE TABLE command to optimize full-text indexes, reducing index fragmentation and improving index performance.

In conclusion, to optimize MySQL full-text indexes, it is necessary to choose the appropriate index type, tokenizer, and parameter settings based on specific circumstances, avoid unnecessary operations, use the appropriate search methods to improve the performance and search effectiveness of full-text indexes.