When reading a MySQL Query Execution Plan (QEP) produced by the EXPLAIN command, generally one of the first observations is to validate an index is being used per table (i.e. per row of output). In MySQL, this is observed with the key column.

In the following two simple single table examples we see the use of the PRIMARY key. To the untrained eye this may lead to assume that the right index is being used.

Example 1

+----+-------------+----------------+-------+---------------+---------+---------+------+------+-------------+
| id | select_type | table          | type  | possible_keys | key     | key_len | ref  | rows | Extra       |
+----+-------------+----------------+-------+---------------+---------+---------+------+------+-------------+
|  1 | SIMPLE      | txxxxxxxxxxxx  | index | NULL          | PRIMARY | 4       | NULL |  100 | Using …

MySQL QA Episode #1: Bash/GNU Tools & Linux Upskill & Scripting Fun

This episode consists of 13 parts, and an introduction. See videos below

In HD quality (set your player to 720p!)

Introduction

Part 1: echo, ls, cp, rm, vi, cat, df, du, tee, cd, clear, uname, date, time, cat, mkdir

Part 2: find, wc, sort, shuf, tr, mkdir, man, more

Part 3: Redirection, tee, stdout, stderr, /dev/null, cat

Part 4: Vars, ‘ vs “, $0, $$, $!, screen, chmod, chown, export, set, whoami, sleep, kill, sh, grep, sudo, su, pwd

Part 5: grep, regex (regular expressions), tr

Part 6: sed, regex (regular expressions)

Part 7: awk

Part 8: xargs

Part 9: subshells, shells, …

MariaDB CONNECT Storage Engine allows to access a JSON file as if it was a local table. The mapping between a hierarchical structure and a relational structure is not ‘natural’ and needs to be defined. To achieve that we need a specific syntax. We associate with each column a ‘field_format’ attribute. This ‘field_format’ column attribute [...]

MySQL Enterprise Backup team is excited to announce the new release of MySQL Enterprise Backup (MEB) 3.12.0.

 MEB 3.12.0 focuses on enhancing the capabilities of the product that would be very useful to the database administrators.

New functionality added

• Support for Open Stack Object Storage

In the last release of MEB, we added cloud support of Amazon S3 to do backups and restore from MEB. Now in MySQL Enterprise Backup 3.12.0, we have added cloud backup and restore using OpenStack Object Storage ("Swift") 1.0.
Authentication can be handled either through Swift's own TempAuth authentication system or the OpenStack Identity Service (Keystone) 2.0.

 A number of new command options have been introduced to support the OpenStack Object Storage. Details of Cloud Storage Options are available …

Welcome to the MySQL QA Training Series!

If you have not read our introductory blog post on pquery yet, I’d recommend reading that one first to get a bit of background. The community is enthuastic about pquery, and today I am happy to announce a full training series on pquery and more. Whether you are a Linux or MySQL newbie or a seasoned QA engineer, there is something here for you. From Bash scripting (see episode 1 below), to every aspect of the new pquery framework, it is my hope that you enjoy this series. If you do, please leave us a comment

Database quality assurance is not as straightforward as it may seem. It’s not a matter of point-and-click, but rather of many intertwined tools and scripts. Beyond that, due to the complexity of the underlying product, it’s about having an overall plan or …

The default InnoDB full-text parser is ideal for latin based languages where whitespace is the token or word separator, but for languages like Chinese, Japanese, and Korean (CJK)—where there is no fixed separators for individual words, and each word can be compromised of multiple characters—we need a different way to handle the word tokens. I’m now very happy to say that in MySQL 5.7.6 we’ve made use of the new pluggable full-text parser support in order to provide you with an n-gram parser that can be used with CJK!

…

Monitoring the metrics of the database hosts is critical. By keeping Swap and Physical Memory usage within allowable limits, you’ll ensure that there is enough memory for queries to be executed and connections to be created. By monitoring Disk Utilization, you can map growth patterns and better plan for capacity upgrades. If you’re using ClusterControl, you would have seen metrics like CPU utilization, Disk, Network Interface , Swap memory usage, physical memory usage, free physical memory, processes and event logs. 

In this blog, we will discuss generic host statistics – CPU, disk, network and memory and the meaning of the data. This is a follow-up to an earlier blog post on Galera metrics monitoring, where we …

In a few weeks, I’ll be speaking at MySQL Conference & Expo about the new major feature in MySQL 5.6, Global Transaction ID (GTID). I’ll explain what is GTID and how to implement a GTID Replication and troubleshoot most of the common issues that might be faced in GTID Replication.
Also, I’ll talk in brief about how to perform the migration from Classic to GTID replication in MySQL 5.6 and the online migration in MySQL 5.7 as well.
My talk is titled “GTID REPLICATION – IMPLEMENTATION AND TROUBLESHOOTING“, more information about my talk can be checked out here.
The conference will be held in …

We are excited to sponsor and exhibit at PGConf US in New York City on March 26 and 27.

The conference is run by the United States PostgreSQL Association and contributes to the awareness and overall growth of the PostgreSQL community.

We are happy to contribute with a database performance solution that provides unprecedented insights into PostgreSQL. Stop by our booth for a free hat and live product demo. We look forward to seeing you next week!

Because interactivity with the trainer (our classes are not dry lectures) and discussions are an important and intrinsic part of our teaching approach, we’ve long tracked development of technologies for online training, but previously were not satisfied.

High costs of various corporate offerings would negatively impact our pricing, given the relatively small scale use and our purposely small classes. The student system requirements would often be problematic – obviously students use different operating systems (Windows, Mac, Linux) and we cannot prescribe that people use a particular OS.

Big Blue Button has long looked like it had the right potential, and it’s now developed to a point where were happy with it. For more tech and practical details, see our Interactive Online Training page.

After our successful trial runs, we have the following …