How to optimize a MySQL database
Author: admin admin Reference Number: AA-00336 Views: 3689 Created: 2013-04-11 13:04 Last Updated: 2013-04-11 13:04 0 Rating/ Voters

One of the most important prerequisites for achieving optimal MySQL database performance is indexing. Indexing is an internal MySQL feature that allows faster gathering of data.

Let’s take an example table called “sample” with only two rows – “number” and “employee“. If you run a simple query such as:

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SELECT * FROM sample WHERE number = 4;

MySQL will check all records and will return only the one that has its number value set to 4.

But if you have several thousand entries for example, this will be a slow query. In this case we have a unique field – “number“. Therefore, we can create an index for it. Indexing will create an internal register that is saved in by the MySQL service. It can be done with the following query:

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ALTER TABLE sample ADD INDEX (number);

Once this index is set, next time you want to get the information for employee number 4, the service will go directly to it using the index and will return the information much faster.

This is just a very basic example. For bigger databases, the difference in the loading time can be significant. Indexing your database can drastically decrease the loading time of your web applications.

There is another query that you can use to increase the loading speed of your database:

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OPTIMIZE TABLE sample;


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