In this blog post I will talk about how to deploy a cluster, the methods I tried and my solution to resolving the prerequisites problem.

I’m fairly new to the big data field. Learning about Hadoop, I kept hearing the term “clusters”, deploying a cluster, and installing some services on namenode, some on datanode and so on. I also heard about Cloudera manager which helps me to deploy services on my cluster, so I set up a VM and followed several tutorials including the Cloudera documentation to install cloudera manager. However, every time I reached the “cluster installation” step my installation failed. I later found out that there are several prerequisites for a Cloudera Manager Installation, which was the reason for the failure to install.

Deploy a Cluster

Though I discuss 3 other methods in detail, ultimately I recommend method …

What better way to learn the basics of MySQL Performance Troubleshooting, than by observing a MySQL expert troubleshoot a nasty MySQL 5.7 performance bug, that a team of DBAs were chasing for weeks before giving up and calling in an external consultant for help.

The bug was causing roughly 2 minute long lock-ups for all MySQL write queries at seemingly random 20-30 hour intervals and it took me (the external consultant) only 4 hours to uncover the issue (and a couple more to find and showcase a solution).

Once upon a time…

Wait. Before we start with the story, I would like to share a couple of basic principles I obey when troubleshooting. A lot of this applies to troubleshooting other types of systems too, but since you’re here for MySQL, let’s focus on that.

First of all, as you may already know from my earlier posts, I am a big fan of a …

In MySQL 5.7.8 we added support for version tokens. This is a new feature that enables you to prevent accessing incorrect or out-of-date data, and stray modifications executing on the wrong server.

For some backstory

When there are multiple MySQL instances running on a Linux machine, there is a reasonable chance that clients could connect to the wrong instance.…

New SSL alternatives SSL connections in previous versions of MariaDB Connector/C based on the OpenSSL library. The OpenSSL heartbleed bug, licensing problems and the lack of supporting different transport layers were the main reasons that we decided to offer SSL alternatives. In addition to OpenSSL the following SSL libraries are supported in Connector/C 3.0: GnuTLS […]

The post New in MariaDB Connector/C 3.0 – Part I: SSL appeared first on MariaDB.org.

In the previous EXPLAIN FORMAT=JSON is Cool! series blog post, we discussed the  

group_by_subqueries

  member (which is child of

grouping_operation

). Let’s now focus on the 

grouping_operation

  and other details of 

GROUP BY

  processing.

grouping_operation

 simply shows the details of what happens when the 

GROUP BY

 clause is run:

mysql> explain format=json …

Awesome.. +1 +1.. This is super useful for me and helped me to connect o Amazon RDS..

I've ran a simple test to see the performance impact of TLS on MySQL connections with MySQL Connector/Python

The test results are in this Jupyter notebook.

TL;DR:

• Try to reuse connections if you use TLS
• Establishing TLS connections is expensive (server & client)
• Improved performance might be possible in the future by using TLS Tickets

Not tested:

• Difference between YaSSL and OpenSSL
• Difference between Ciphersuites
• Performance of larger resultsets and queries

Testing functionalities and options for a database can be challenging at times, as a live production environment might be required. As I was looking for different options, I was directed by Derek Downey to this post in the Percona blog.

The blog discussed an interesting and fun tool from Percona, tpcc-mysql. I was interested in testing the tool so I decided to play around with it in an AWS EC2 server.

In this post I will expand on the Percona blog post, since the tool lacks documentation, as well as explain how I used it to create a MySQL Benchmark in AWS.

Why tpcc-mysql?

There are various reasons why tpcc-mysql could be a good …

Too often developers and DBAs struggle to pinpoint the root cause of MySQL database performance issues, and then spend too much time in trying to fix them. Wouldn’t it be great to bypass wasted guesswork and get right to the issue?

In our upcoming webinar Tired of MySQL Making You Wait? we’re going to help you discover how to significantly increase the performance of your applications and reduce database response time.

In this webinar, Principal Architect Alexander Rubin and Database Evangelist Janis Griffin will provide the key steps needed to identify, prioritize, and improve query performance.

They will discuss the following topics:

• Wait time analytics using …

What better to do during the holiday season than to read the Log Buffer? This log buffer edition is here to add some sparkle to Oracle, MySQL and SQL Server on your days off.

Oracle:

• Ops Center version 12.3.1 has just been released. There are a number of enhancements here.
• Oracle R Enterprise (ORE) 1.5 is now available for download on all supported platforms with Oracle R Distribution 3.2.0 / R-3.2.0. ORE 1.5 introduces parallel distributed implementations of Random Forest, Singular Value Decomposition (SVD), and Principal Component Analysis (PCA) that operate on ore.frame objects.
• Create a SOA Application in JDeveloper 12c Using Maven …