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Fernando IparIn this post, I want to talk about MongoDB data durability options across MongoDB versions. I consider a write durable if, once confirmed by the server, it becomes permanent at the node or cluster level (ignoring catastrophic failures like all nodes on a cluster failing at the same time). MongoDB lets you choose between different levels […]
In this blog, I will discuss how I found some of my basic SQL assumptions that don’t hold true when dealing with MongoDB and non-existent collections. Coming from a MySQL background, I have some assumptions about databases that don’t apply to MongoDB (or other kinds of databases that are neither SQL-based nor relationally-inspired). An example […]
In this blog post, we’ll discuss how to benchmark MongoDB with sysbench. In an earlier post, I mentioned our use of sysbench-mongodb (via this fork) to run benchmarks of MongoDB servers. I now want to share our work extending sysbench to make it work with MongoDB. If you’re not familiar with sysbench, it’s a great project developed […]
In this blog post, we’ll discuss how using Prometheus can help with monitoring MongoDB response time. I am currently comparing the performance of different storage engines on Percona Server for MongoDB, using a slightly customized version of Tim Callaghan’s sysbench-mongodb. Since I’m interested in measuring response time for database operations, I created a very simple exporter of response time […]
In a recent post, Vadim compared the performance of Amazon Aurora and Percona Server on AWS. This time, I am comparing write throughput for InnoDB and TokuDB, using the same workload (sysbench oltp/update/update_non_index) and a similar set-up (r3.xlarge instance, with general purpose ssd, io2000 and io3000 volumes) to his experiments. All the runs used 16 threads for sysbench, and the following […]
I recently helped a customer figure out why a minor version MySQL upgrade was indicating that some tables needed to be rebuilt. The mysql_upgrade program should be run for every upgrade, no matter how big or small the version difference is, but when only the minor version changes, I would normally not expect it to […]
Martin Arrieta and I gave an online presentation last week on “Putting MySQL Fabric To Use.” If you missed it, you can find a recording and the slides here, and the vagrant environment we used plus a transcript of the commands we ran here (be sure to check out the ‘sharding’ branch, as that’s what we used […]
Martin and I have recently been blogging together about MySQL Fabric (in case you’ve missed this, you can find the first post of the series here), and on July 30th, we’re going to be presenting a webinar on this topic titled “Putting MySQL Fabric to Use.” The focus of the webinar is to help you get […]
This is the fourth post in our MySQL Fabric series. In case you’re joining us now, we started with an introductory post, and then discussed High Availability (HA) using MySQL Fabric here (Part 1) and here (Part 2). Today we will talk about how MySQL Fabric can help you scale out MySQL databases with sharding. Introduction At the […]
This is the third post in our MySQL Fabric series. If you missed the previous two, we started with an overall introduction, and then a discussion of MySQL Fabric’s high-availability (HA) features. MySQL Fabric was RC when we started this series, but it went GA recently. You can read the press release here, and see this blog post from Oracle’s Mats […]
In our previous post, we introduced the MySQL Fabric utility and said we would dig deeper into it. This post is the first part of our test of MySQL Fabric’s High Availability (HA) functionality. Today, we’ll review MySQL Fabric’s HA concepts, and then walk you through the setup of a 3-node cluster with one Primary and two […]
While built-in replication has been a major cause for MySQL’s wide adoption, official tools to help DBAs manage replication topologies have typically been missing from the picture. The community has produced many good products to fill in this gap, but recently, Oracle has been filling it too with the addition of MySQL Utilities to the mix. One […]
Next week, on Nov. 6, I will be delivering a webinar about running MySQL on Windows, with a strong focus on Linux-based sysadmins and DBAs – and how not to go crazy in the process. An interesting (and challenging!) part of working for Percona is that you never know what kind of setup a customer […]
I’m happy to announce that the recording for my recent webinar “5 Proactive Measures to Minimize MySQL Downtime” is now available, along with the slides. They can both be found here. My webinar focused on the top 5 operational measures that prevent or reduce downtime — along with the related business impact in a significant […]
Failure is an unavoidable part of IT life, but it does not always have to imply MySQL service downtime. In the years I have been working at Percona, I have been involved in many customer emergency cases, and I have seen a good number of problems that could have been avoided or alleviated if relatively […]
I recently had to do some customer work involving the McAfee MySQL Audit Plugin and would like to share my experience in this post. Auditing user activity in MySQL has traditionally been challenging. Most data can be obtained from the slow or general log, but this involves a lot of data you don’t need too, and […]
I had the chance to work on an interesting case last week, and I thought I’d share what I think is a little known goodie from Percona Toolkit for MySQL called pt-query-digest. One customer was suffering from periods of high load on their database server, leading to degraded application performance, and sometimes even short moments […]
First, a thank you to everyone who attended the webinar Today, I appreciate your time and nice comments. As promised, here are answers to questions that couldn’t be answered during the talk: Q: How do you install the tools? The manual has full details, but it’s important to know that the latest release for […]
On December 19th at 1 PM Eastern / 10 AM Pacific, I will be giving a webinar entitled “10 Percona Toolkit Tools Every MySQL DBA Should Know About”. As a Consultant, I make heavy use of Percona Toolkit tools while solving customers’ problems, and I have used this experience to select what I consider to […]
I recently worked on a customer case where at seemingly random times, inserts would fail with Innodb error 139. This is a rather simple problem, but due to it’s nature, it may only affect you after you already have a system running in production for a while.