Monthly Archives - January 2017

Docker Security Vulnerability CVE-2016-9962

CVE-2018-19039

Docker 1.12.6 was released to address CVE-2016-9962. CVE-2016-9962 is a serious vulnerability with RunC.
Quoting the coreos page (linked above):
“RunC allowed additional container processes via runc exec to be ptraced by the pid 1 of the container. This allows the main processes of the container, if running as root, to gain access to file-descriptors of these new processes […]

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MySQL Sharding Models for SaaS Applications

MySQL Sharding Models

In this blog post, I’ll discuss MySQL sharding models, and how they apply to SaaS application environments.
MySQL is one of the most popular database technologies used to build many modern SaaS applications, ranging from simple productivity tools to business-critical applications for the financial and healthcare industries.
Pretty much any large scale SaaS application […]

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MariaDB ColumnStore

MariaDB ColumnStore

Last month, MariaDB officially released MariaDB ColumnStore, their column store engine for MySQL. This post discusses what it is (and isn’t), why it matters and how you can approach a test of it.
What is ColumnStore?

ColumnStore is a storage engine that turns traditional MySQL storage concepts on their head. Instead of storing the data by […]

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Percona Software News and Roadmap Update with CEO Peter Zaitsev: Q1 2017

Percona Software News and Roadmap Update

This blog post is a summary of the webinar Percona Software News and Roadmap Update – Q1 2017 given by Peter Zaitsev on January 12, 2017.
Over the last few months, I’ve had the opportunity to meet and talk with many of Percona’s customers. I love these meetings, and I always get a bunch of questions […]

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When MySQL Lies: Wrong seconds_behind_master with slave_parallel_workers > 0

MySQL Error Code 1215

In today’s blog, I will show an issue with seconds_behind_master that one of our clients faced when running slave_parallel_workers > 0. We found out that the reported seconds_behind_master from SHOW SLAVE STATUS was lying. To be more specific, I’m talking about bugs #84415 and #1654091.
The Issue
MySQL will not report the correct slave lag if you have slave_parallel_workers > […]

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