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Indexes are most helpful for direct comparisons, ranges, or where searching the beginning of a column’s value.

If the site’s problems could be database related, it may be time to check up on what exactly is happening on that back end.There are several situations in which mysql slowness can originate.The first possibility, and the easiest one to check, is if the database contains slow queries. To answer that, we first need to know what indexes are and how they are used. An index is a sorted set of data that references the primary key of a table, similar to a phone book having a list of last names which make it easy to find a phone number.An index enables a query to very quickly find specific values in a column, for fast data retrieval from a table.In the absence of an index, a query would need to scan the entire table to check for any matches in the column.

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