To build a package, Omnibus compiles dependencies. If it’s a Python project, Omnibus will compile python each time it packages the project. If the project depends on a library – it will have to be recompiled every time. That’s suboptimal, let’s see what we can do to reduce the build time. I was inspecting omnibus/omnibus.rb when […]

If a service can be managed with API most probably you will find it in an impressive list of Terraform providers. Yes, GitHub is there, too. TwinDB hosts software in GitHub, it felt wrong I don’t manage it with Terraform yet, so I decided to give it a go. Prerequisites Directory layout I keep all […]

Recently, we have implemented a set of new commands in ProxySQL Tools to manage MySQL users. You can create, delete, and modify users from the command line. Following commands are available:

You can set a user’s password at the time of creation with —-password option, or later on with the set_password sub-command. Create user Let’s add a […]

When we started working with a customer they asked us to setup for them more reliable and performant MySQL database. At the time they were using Percona XtraDB cluster with ELB to balance read traffic between PXC nodes. There was no writer redundancy – if a writer node was down, the app was down. The […]

Usually application don’t connect directly to Percona XtraDB Cluster, but go through a proxy – ProxySQL, for instance. However, if only one proxy node is used it becomes a single point of failure. Not long ago Marco Tusa wrote about how to configure two ProxySQL nodes in front of XtraDB cluster. If deployed on EC2 instances, it […]

Originally, the goal of the benchmark is to compare performance and price/performance of Amazon RDS (Aurora) and MySQL server running on an EC2 instance.

ProxySQL is a high performance proxy for MySQL and its forks. One of its key features is the ability to handle hundreds of thousands of connections with very low overhead. Some of the other key features are query caching, traffic mirroring, query routing and pluggable architecture. In addition, it’s the only open source proxy that […]

First of all,pt-table-checksum is perfect for checking if the master and its slaves are in-sync. It answers the question “Are the slaves consistent with the master?”. However, if they’re not, pt-table-checksum doesn’t actually tell you what exactly is wrong.

Frompt-table-checksum to pt-table-sync Nevertheless, pt-table-sync may give you a partial answer. It can print SQL statements to sync the replication […]

These are the slides of the “Efficient Use Of Indexes In MySQL” talk we delivered on the SFMySQL Meetup. This is an introductory talk for developers on MySQL indexes. In my opinion, it’s quite important to understand how InnoDB organizes data. If you know how MySQL accesses data, it’s easier to write optimal queries. When working […]