MySQL 1116: Too many tables used.

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What is

MySQL 1116: Too many tables used.

 ?

When encountering the error "1116: Too many tables used" in MySQL, here's an immediate action plan:

  1. Identify the Query Causing the Issue:


Start by identifying which query or queries are causing the issue. If you have access to the application logs, check them for any large or complex queries that were running at the time the error occurred.

  1. Check Open Tables:


To see how many tables are currently open, you can run the following MySQL command:
SHOW STATUS LIKE 'Open_tables';

  1. Optimize the Query:


If you've identified a specific query that's causing the problem, analyze it to see if it can be optimized to use fewer tables. This might involve rewriting the query or breaking it into smaller, more manageable parts.

  1. Increase the `tableopencache` Setting:


Temporarily, you can increase the `tableopencache` setting to allow more tables to be open simultaneously. To see the current setting, run:
SHOW VARIABLES LIKE 'tableopencache';
To increase it, you need to edit your MySQL configuration file (`my.cnf` or `my.ini`, depending on your system) and increase the `tableopencache` value, then restart the MySQL service. Note that increasing this value will require more memory.

  1. Check and Optimize Table Use in Stored Procedures/Functions:


If the problem persists and you're using stored procedures or functions, review them to ensure they're not opening unnecessary tables or can be optimized.

  1. Review JOINs in Queries:


Examine any queries with JOINs to ensure they're not unnecessarily complex or pulling in more tables than needed.

  1. Reduce the Number of Temporary Tables:


If your queries use a lot of temporary tables, try to optimize them to reduce the number. Complex subqueries, for example, can often create temporary tables.

Remember, after making any changes, monitor the system to ensure the problem does not recur and that performance is satisfactory.

Attached error: 
MySQL 1116: Too many tables used.
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