One of the most exciting features Amazon Aurora Serverless brings to the table is its ability to go to sleep (pause) when idle. This is a fantastic feature for development and test environments. You get access to a powerful database to run tests quickly, but it goes easy on your wallet as you only pay for storage when the instance is paused.

You can configure Amazon RDS Aurora Serverless to go to sleep after a specified period of time. This can be set to anywhere between five minutes and 24 hours

For this feature to work, however, inactivity has to be complete. If you have so much as a single query or even maintain an idle open connection, Amazon Aurora Serverless will not be able to pause.

This means, for example, that pretty much any monitoring you may have enabled, including our own …

Percona Live Open Source Database Conference 2019 in North America has moved to Austin, Texas: a cool place to be, and host to many big names in the tech space. Read what Dave Stokes, MySQL Community Manager for Oracle, has to say in favor of Austin.

If you need a conference ticket for Austin, put in your proposal now!

Those who are successful with their presentation or tutorial submissions will receive a pass to the full three days of the event. Closing date for the call for papers is Sunday, January 20.

Percona is adopting an industry trend by organizing the conference into 13 separate tracks …

In Part I, we introduced a High Availability (HA) framework for MySQL hosting and discussed various components and their functionality. Now in Part II, we will discuss the details of MySQL semisynchronous replication and the related configuration settings that help us ensure redundancy and consistency of the data in our HA setup. Make sure to check back in for Part III where we will review various failure scenarios that could arise and the way the framework responds and recovers from these conditions.

What is MySQL Semisynchronous Replication?

Simply put, in a …

A few days ago, I stepped into a trap !  This made me lose time for fixing things (and even more for writing this post...).  In the hope that you will avoid my mistake, I am sharing this war story.  I also obviously opened a bug, more about this below.

TL&DR: be careful when using CHANGE MASTER TO MASTER_DELAY = N: it might wipe your relay logs !

As written in the TL&DR, running CHANGE MASTER 

We know that MySQL query cache is deprecated as of MySQL 5.7.20 and removed in MySQL 8.0 and It has been recommended to use ProxySQL (or other) external query cache instead.

In this blog post, we’ll present the ProxySQL query cache functionality and how does it help us.

How to setup ProxySQL between client and database servers is out of the scope of this article.

If you are looking for other articles on ProxySQL Series :

• MySQL replication Read-Write Split up
• Replication Switchover using Proxysql And …

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Since 5.7.12 MySQL includes what is called the X plugin, but also it includes X protocol and X DevApi. But what is all this and how does it work? Let me share a personal short story on how I found myself investigating this feature. In a previous post I wrote about the MySQL Router tool, and our colleague Mr. Lefred pointed out that I was wrong about X protocol, because I mentioned it was created to be used with JSON docs. Given this input, I wanted to investigate in a little bit more depth about what all this “X” means and how it can be used in our day to day operations.

First problem I found is that the documentation is pretty extensive in the how’s but it was really hard to find the what’s. This is a bit strange, because for people trying to research about …

1.0. Introduction:

MySQL 8.0 was released with awesome features. One of its most prominent features is CTE (Common Table Expression).

The Common Table Expression can be used to construct complex queries in a more readable manner. In this blog, I have described how the CTE works with some useful examples.

1.1 What is CTE?

A Common Table Expression (CTE) is the result set of the query, which exists temporarily and uses only within the context of a larger query.

The CTE provides better readability and performance in comparison with a derived table.

In a normal query the temporary result set that exists only within the execution scope of a single SQL statement.

Example:

select …

As you know, MySQL uses some keywords and some of them are also reserved.

Let’s have a look how to deal with that:

mysql> create table WRITE (id int auto_increment primary key, varying varchar(10), than int);
 ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your 
MySQL server version for the right syntax to use near 'WRITE (id int auto_increment primary key, 
varying varchar(10), than int)' at line 1

OK, it seems WRITE is a keyword I cannot use as table name. I’ve then two choices:

• rename the table to something else like WRITE_TBL
• use back-ticks (`) around the table like `WRITE`

Let’s use the first option:

mysql> create table WRITE_TBL (id int auto_increment primary key, varying varchar(10), than …

Amazon Aurora with MySQL Compatibility comes in three editions which, at the time of writing, have quite a few differences around the features that they support.  Make sure you don’t assume the newer Aurora 2.x supports everything in Aurora 1.x. On the contrary, right now Aurora 1.x (MySQL 5.6 based) supports most Aurora features.  The serverless option was launched for this version, and it’s not based on the latest MySQL 5.7.  However, the serverless option, too, has its own set of limitations

I found a concise comparison of what is available in which Amazon Aurora edition hard to come by so I’ve created one.  The table was compiled based mostly on documentation research, so if you spot some mistakes please let me know and I’ll make a correction.

Please keep in mind, this is expected to …