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MariaDB 10.1.25 now available

MariaDB 10.1.25 now available dbart Tue, 07/04/2017 - 11:07

The MariaDB project is pleased to announce the immediate availability of MariaDB 10.1.25, MariaDB Connector/J 2.0.3, and MariaDB Connector/J 1.6.2. See the release notes and changelogs for details.

Download MariaDB 10.1.25

Release Notes Changelog What is MariaDB 10.1?

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MySQL Group Replication: understanding Flow Control

When using MySQL Group Replication, it’s possible that some members are lagging behind the group. Due to load, hardware limitation, etc… This lag can become problematic to keep good certification behavior regarding performance and keep the possible certification failure as low as possible. Bigger is the applying queue bigger is the risk to have conflicts with those not yet applied transactions (this is problematic on Multi-Primary Groups).

Galera users are already familiar with such concept. MySQL Group Replication’s implementation is different 2 main aspects:

  • the Group is never totally stalled
  • the node having issues doesn’t send flow control messages to the rest of the group asking for slowing down

In fact, every member of the Group send some statistics about its queues (applier queue and certification queue) to the other members. Then every node decide to slow down or not if they …

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How to Use PHP and MySQL Document Store

PHP Developers can now try the MySQL Document Store by using the MySQL X DevAPI for PHP PECL Extension. Developers in other languages have had access for a while but now PHP coders can get in on the action and use the MySQL Document Store. What Does the Code Look Like?


#!/usr/bin/php
<?PHP
// Connection parameters
$user = 'root';
$passwd = 'S3cret#';
$host = 'localhost';
$port = '33060';
$connection_uri = 'mysqlx://'.$user.':'.$passwd.'@'.$host.':'.$port;
echo $connection_uri . "\n";

// Connect as a Node Session
$nodeSession = mysql_xdevapi\getNodeSession($connection_uri);
// "USE world_x"
$schema = $nodeSession->getSchema("world_x");
// Specify collection to use
$collection = $schema->getCollection("countryinfo");
// SELECT * FROM world_x WHERE _id = "USA" …
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Webinar Wednesday July 5, 2017: Indexes – What You Need to Know to Get the Most Out of Them

Join Percona’s Senior Architect, Matthew Boehm, as he presents Indexes – What You Need to Know to Get the Most Out of Them on Wednesday, July 5, 2017 at 8:00 am PDT / 11:00 am EDT (UTC-7).

Register Now

Proper indexing is key to database performance. Find out how MySQL uses indexes for query execution, and then how to come up with an optimal index strategy. In this session, you’ll also learn how to know when you need an index, and also how to get rid of indexes that you don’t need to speed up queries.

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Query Reviews (part 2): pt-query-digest

Query reviews (part 1): Overview

The 1st post in the series gave an overview of what a query review is and the value they can bring you. So now let’s talk about how one is done, specifically, how to do a query review using pt-query-digest.

The point of a query review is that it is a comprehensive review of queries. Imagine if you could get a list of all queries that run on your system, and then you systematically looked at each query to determine if it is optimized. That is the basic concept behind a query review.

So, how do you get a list of queries?

pt-query-digest can use a slow query log, binary log, general log or tcpdump. I usually use a slow query log with long_query_time set to 0, so I can capture all the …

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SET PASSWORD will lock you out of your slave in a mixed 5.6/5.7 MySQL topology

Long time no post.... :-)
Here's something interesting.

Last week I decided to give MySQL 5.7 a try (yes, I am kinda conservative DBA...) and the very same day that I installed my first 5.7 replica I noticed that, after changing my own password on the 5.6 master, I could no longer connect to the 5.7 slave.

Very annoying, to say the least! So I went and dug out the root password (which we do not normally use) and when I connected to the slave I was surprised to see that my password's hash on the 5.7 slave was different than the hash on the 5.6 master. No wonder I couldn't connect....

A bit of research on the MySQL documentation and I understood that 5.7 introduced few changes around the way you work with users' passwords.  SET PASSWORD is now deprecated in favour of ALTER USER: see MySQL 5.7 Reference Manual …

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The Tech Recruitment Process At Drivy

I recently saw another article highlighting the many ways in which recruitment in software development is broken. Whiteboard coding, random trivia, poorly trained interviewers… it’s all very painful and it seems to be the situation in a lot of places.

However there are companies trying to turn this around. For instance I loved the “Companies that don’t have a broken hiring process” list, and I’m constantly working to make sure Drivy deserves its place in it.

Since this is still a major pain point, I decided to share how we handle recruitment for engineering positions at Drivy. I don’t think that it’s perfect or much out of the ordinary. I’m also convinced that it’s going to evolve as it has done in the past, but it’s …

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RT @LauraMDMaguire: Highlight of #rea2017: Panel discussion from #continuousdelivery experts at @IEX @IBM @Etsy talking #resilience #systemsthinking

Highlight of #rea2017: Panel discussion from #continuousdelivery experts at @IEX @IBM @Etsy talking #resilience #DevOps #systemsthinking

— Laura Maguire (@LauraMDMaguire) June 30, 2017
Source: @mysqldbahelp July 02, 2017 at …

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One more time with sysbench, a small server & MySQL 5.6, 5.7 and 8.0

 Update - the regression isn't as bad as I have been reporting. Read this post to understand why.

The good news is that I hope to begin debugging this problem next week. After fixing a few problems to reduce variance I am repeating tests to document the performance regression from MySQL 5.6 to 8.0. The first problem was fixed by disabling turbo boost on my Intel NUC servers to avoid thermal throttling. The other problem was the impact from mutex contention for InnoDB purge threads and I repeated tests with it set to 1 and 4. This is part of my series on low-concurrency CPU …

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On Apache Ignite, Apache Spark and MySQL. Interview with Nikita Ivanov

“Spark and Ignite can complement each other very well. Ignite can provide shared storage for Spark so state can be passed from one Spark application or job to another. Ignite can also be used to provide distributed SQL with indexing that accelerates Spark SQL by up to 1,000x.”–Nikita Ivanov.

I have interviewed Nikita Ivanov,CTO of GridGain.
Main topics of the interview are Apache Ignite, Apache Spark and MySQL, and how well they perform on big data analytics.

RVZ

Q1. What are the main technical challenges of SaaS development projects?

Nikita Ivanov: SaaS requires that the applications be highly responsive, reliable and web-scale. SaaS development projects face many of the same challenges as …

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