In this blog, I will provide answers to the Q & A for the Troubleshooting Slow Queries webinar.

First, I want to thank you for attending the April 28 webinar. The recording and slides for the webinar are available here. Below is the list of your questions that I wasn’t able to answer during the webinar, with responses:

Q: I’ve heard that is a bad idea to use

select *

; what do you recommend?

A: When I used

SELECT *

 in my slides, I wanted to underline the idea that sometimes you need to select all columns from the …

Percona is glad to announce the new release of Percona XtraDB Cluster 5.6 on May 20, 2016. Binaries are available from the downloads area or our software repositories.

Percona XtraDB Cluster 5.6.29-25.15 is now the current release, based on the following:

• Percona Server 5.6.29-76.2
• …

The majority of DBA’s perform health checks every now and then. Usually, it would happen on a daily or weekly basis. We previously discussed why such checks are important and what they should include.

To make sure your systems are in a good shape, you’d need to go through quite a lot of information - host statistics, MySQL statistics, state of backups, logs and so forth. Such data should be available in every properly monitored environment, although sometimes it is scattered across multiple locations - you may have one tool to monitor MySQL state, another tool to collect system statistics, maybe a set of scripts, e.g., to check the state of your backups. This makes health checks much more time-consuming than they should be - the DBA has to put together the different pieces to understand the state of the system.

Integrated …

This year at Etsy, we spun up a “Database Working Group” that talks about all things data. It’s made up of members from many teams: DBA, core development, development tools and data engineering (Hadoop/Vertica). At our last two meetings, we started talking about how many “sources of information” we have in our environment. I hesitate to call them “sources of truth” because in many cases, we just report information to them, not action data based on them. We spent a session whiteboarding all of of these sources and drawing the relationships between them. It was a bit overwhelming to actually visualize the madness.

A few examples:

• We use Chef for configuration management and Chef knows about all database server. It made sense for us to build out our monitoring to generate Nagios configuration based on that data from Chef. When …

In this blog post, we’ll discuss fixing MySQL scalability problems using either ProxySQL or thread pool.

In the previous post I showed that even MySQL 5.7 in read-write workloads is not able to maintain throughput. Oracle’s recommendation to play black magic with

innodb_thread_concurrency

 and

innodb_spin_wait_delay

 doesn’t always help. We need a different solution to deal with this scaling problem.

All the conditions are the same as in my previous run, but I will use:

• ProxySQL limited to 200 connections to MySQL. ProxySQL has a capability to multiplex incoming connections; with this setting, even with 1000 connections to the proxy it will …

Percona is glad to announce the release of Percona Server 5.5.49-37.9 on May 19, 2016. Based on MySQL 5.5.49, including all the bug fixes in it, Percona Server 5.5.49-37.9 is now the current stable release in the 5.5 series.

Percona Server is open-source and free. Details of the release can be found in the 5.5.49-37.9 milestone on Launchpad. Downloads are available here and from the Percona Software Repositories.

Bugs …

This tutorial describes the installation of a clustered web, email, database and DNS server to be used for redundancy, high availability and load balancing on Debian 8 with the ISPConfig 3 control panel. MySQL Master/Master replication will be used to replicate the MySQL client databases between the servers, Unison will be used to Sync the /var/www (websites) and the Mails will be synced with Dovecot.

Welcome to this week’s Planets9s, covering all the latest resources and technologies we create around automation and management of open source database infrastructures.

Some time ago, I published the article “AWS Aurora Benchmarking - Blast or Splash?”. In which I was analyzing the behavior of different solutions using synchronous replication in AWS environment.

After I published it, I received a lot of comments and feedback, from the community and from Amazon engineers.

Given that I had decide to perform another round of tests, keeping into account the comments received and the suggestions.

I had presented some of the results during the Percona conference in Santa Clara last April 2016. The following is the transposition into an article of that presentation with more details.

{autotoc enabled=yes}

Why new test?

Very good question, with an easy answer. …

In this blog, we’ll discuss how to find the MySQL 5.7 root password.

While new MySQL software security features are always welcome, they can impact use and performance. Now by default, MySQL 5.7 creates a password for the root user (among other changes) so the installation itself can be considered secure. It’s a necessary change, but it has confused some customers and users. I see a lot of people on social networks (like Twitter) asking about this change.

Where is my root password?

The answer depends on the way you have installed MySQL 5.7 or Percona Server 5.7. I am going to show where to find the password depending on the installation method and the distribution used. For all these examples, I assume this is a new installation and you are using the default my.cnf.

Centos/Redhat – …