How to Disable Mysql Query Caching?

To disable MySQL query caching, you can do so by modifying the MySQL configuration file (my.cnf). Locate the section that enables query caching and set the values to 0 or comment out the lines. You can find the query_cache_type and query_cache_size parameters in the configuration file. Once you have made the changes, save the file and restart the MySQL service for the changes to take effect. After disabling query caching, MySQL will no longer cache query results, which may improve performance in some cases.

How to disable query caching for specific tables in MySQL?

To disable query caching for specific tables in MySQL, you can use the SQL command SQL_NO_CACHE in your query.

1. Start by running the following command to turn off the query cache:

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SET SESSION query_cache_type = OFF;

1. Then, when executing a query that you want to disable caching for, use the SQL_NO_CACHE hint in the query, like this:

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SELECT SQL_NO_CACHE * FROM your_table_name;

By using SQL_NO_CACHE, the result of the query will not be cached in the query cache for that specific table.

What is the query cache feature in MySQL?

The query cache feature in MySQL is a caching mechanism that stores the results of SELECT queries so that if the same query is executed again, MySQL can retrieve the results from the cache rather than having to re-execute the query. This can improve performance by reducing the amount of time it takes to return results for frequently executed queries. However, it is important to note that the query cache feature can also have drawbacks, such as potential decreased performance for tables that are frequently updated or for queries that involve JOINs or subqueries. Additionally, the query cache feature has been deprecated in MySQL 5.7 and removed in MySQL 8.0, so it is no longer available in newer versions of MySQL.

How to disable the query cache feature in MySQL?

To disable the query cache feature in MySQL, you can follow these steps:

1. Connect to your MySQL server using your preferred command-line tool or a GUI like MySQL Workbench.
2. Run the following SQL query to check if the query cache is enabled: SHOW VARIABLES LIKE 'query_cache_type';
3. If the query_cache_type variable is set to a value other than OFF, you can disable the query cache by running the following query: SET GLOBAL query_cache_type = 0;
4. To make the change persistent across server restarts, you can add the following line to your MySQL configuration file (my.cnf or my.ini): query_cache_type = 0
5. Restart your MySQL server to apply the changes.

After following these steps, the query cache feature should be disabled in your MySQL server.

What is query cache hit ratio in MySQL?

Query cache hit ratio in MySQL is a metric that measures the percentage of queries that are served from the query cache rather than being executed against the database. A high query cache hit ratio indicates that a large proportion of queries are being served from the cache, which can improve performance by reducing the number of times queries need to be executed and data needs to be retrieved from disk. A low query cache hit ratio, on the other hand, may indicate that the query cache is not being utilized effectively and that queries are not being cached as frequently as desired.

How to disable MySQL query caching permanently?

To permanently disable MySQL query caching, follow these steps:

1. Open your MySQL configuration file. This is usually found at /etc/mysql/my.cnf or /etc/my.cnf.
2. Find the following lines in the configuration file:

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query_cache_type = 1
query_cache_size = 16M

1. Change query_cache_type to 0 to disable query caching:

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query_cache_type = 0

1. Save the configuration file and restart the MySQL service to apply the changes.

After completing these steps, MySQL query caching should be disabled permanently.