In a scenario with a table containing a keywords column and an InnoDB storage engine, optimizing queries using the LIKE '%string%' pattern can be a challenge.
Initially, a simple index was added to the keywords column. However, EXPLAIN queries revealed that the entire table had to be scanned when queries used the '%string%' pattern. This index proved beneficial only for LIKE 'string%' queries.
For InnoDB tables, fulltext indexes are preferred for queries with floating search terms, where the search term is located anywhere in the string. However, it was previously believed that InnoDB did not support fulltext indexes.
In recent releases (5.6.4 and later), InnoDB gained fulltext index support. This means that for optimized LIKE '%string%' queries, upgrading to InnoDB version 5.6.4 or higher is recommended. Fulltext indexes are specifically designed for floating search terms.
By using fulltext indexes, 'floating' search terms can be efficiently located within the keywords column. This eliminates the need to scan the entire table, significantly improving query performance for LIKE '%string%' queries in InnoDB tables.
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