The latest from the MySQL community

As a part database administration, DBA has to take care of sub-components of database like server logs and has to plan for maintenance activity for these components regularly.

MySQL has various types of log i.e binary log, error log, slow query log, general log for different purposes. And after certain time these logs will grow and you will start seeing issues like low disk space, a large number of logs etc.

MySQL allows you to flush logs using flush logs command, next “How to rotate and clean up old MySQL logs? ”

Linux has a utility called “logrotate” , using logrotate we can implement log rotation for MySQL server logs.

Binary logs: This one is critical if you have replication setup, By enabling  expire_logs_days mysql variable you can manage …

Be involved with MySQL Performance in some way is to ask them what should be tuned in MySQL Server straight after installation, assuming it was installed with default settings.

Even though you can tune quite a lot of variables in MySQL Servers only few of them are really important for most common workload. After you get these settings right other changes will most commonly offer only incremental performance improvements.

key_buffer_size – Very important if you use MyISAM tables. Set up to 30-40% of available memory if you use MyISAM tables exclusively. Right size depends on amount of indexes, data size and workload – remember MyISAM uses OS cache to cache the data so you need to leave memory for it as well, and data can be much larger than indexes in many cases. Check however if all of key_buffer is used over time – it is not rare to see key_buffer being set to 4G while combined size of …

Valeriy Kravchuk’s great recent post on using oprofile to profile MySQL mentioned how pt-stalk, the script from Percona Toolkit to capture diagnostics data based on a detected condition, currently does not support the new operf comand, and relies instead on the deprecated and soon to be removed, opcontrol.

Fortunately, in the Open Source world, we deal with these situations by contributing, and this seemed a simple enough change that I could get a PR ready quickly and reply …

Welcome to another post in the series of Percona Live featured tutorial speakers blogs! In these blogs, we’ll highlight some of the tutorial speakers that will be at this year’s Percona Live conference. We’ll also discuss how these tutorials can help you improve your database environment. Make sure to read to the end to get a special Percona Live 2017 registration bonus!

In this Percona Live featured tutorial, we’ll meet Derek Downey (OSDB Practice Advocate, Pythian), David Turner (Storage SRE, Uber) and René Cannaò (MySQL SRE, Dropbox / ProxySQL). Their session is ProxySQL Tutorial. There is a stigma attached to database proxies when it comes to MySQL. This tutorial hopes to blow away that stigma by showing you what can be done with a proxy designed from the …

Percona announces the release of Percona Server for MySQL 5.5.54-38.6 on February 1, 2017. Based on MySQL 5.5.54, including all the bug fixes in it, Percona Server for MySQL 5.5.54-38.6 is now the current stable release in the 5.5 series.

Percona Server for MySQL is open-source and free. You can find release details in the 5.5.54-38.6 milestone on Launchpad. Downloads are available here and from the Percona Software Repositories.

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The FOSDEM MySQL & Friends Community Dinner 2017 is sold out. In the first 24 hours of opening up the registration for the dinner, we sold more than 40 of the 63 total tickets!

I quickly wanted to take some time again to thank our sponsors, who help keep this event possible and affordable:

Wondering how to get there from Fosdem?

The venue itself is located very close to the VUB. You can find the route to get there  …

SQL Injection is a highly feared and often misunderstood problem. The basic phobia is that someone hijacks your SQL request and suddenly has full access to everything in your database. Well, it usually is not that easy and it is actually easy to avoid. Rule 1: Never Trust User SuppliedThe usual example is something like a query SELECT * FROM customer_data WHERE customer_id='$id' and the programmer was expecting an integer for the customer_id. But a dastardly use inserts some horrible SQL code to pirate the information so the query looks like SELECT * FROM customer_data WHERE customer_id=1 OR customer_id > 0 and suddenly all your customer data is out free in the universe waiting for who knows what.

The code could have checked to see if the value of customer_id was truly an integer or returning an error if not. The is_int function was designed to do just this.

if is_int($customer_id)  {
 …

In this blog post, we’ll look at Performance Schema benchmarks for OLTP Read/Write workloads.

I am in love with Performance Schema and talk a lot about it. Performance Schema is a revolutionary MySQL troubleshooting instrument, but earlier versions had performance issues. Many of these issues are fixed now, and the default options work quickly and …

SQL databases tend to be rigid.

If you have worked with them, you would agree that database design though it seems easier, is a lot trickier in practice. SQL databases believe in structure, that is why it's called structured query language.

On the other side of the horizon, we have the NoSQL databases, also called schema-less databases that encourage flexibility. In schema-less databases, there is no imposed structural restriction, only data to be saved.

Though every tool has it's use case, sometimes things call for a hybrid approach.

What if you could structure some parts of your database and leave others to be flexible?

MySQL version 5.7.8 introduces a JSON data type that allows you to accomplish that.

In this tutorial, you are going to learn.

1. How to design your database tables using …

In this blog, we’ll look at how to manually build Percona Server for MySQL RPM packages.

Several customers and other people from the open source community have asked us how they could make their own Percona Server for MySQL RPM binaries from scratch.

This request is often made by companies that want to add custom patches to our release. To do this, you need to make some modifications to the

percona-server.spec

 file in the source tree, and some preparation is necessary.

This post covers how you can make your own RPMs from GIT or source tarball so that you can build RPMs from your own modified branch, or by applying patches. In this example, we’ll build Percona Server 5.7.16-10.

Making your own RPMs is not a recommended practice, and should rarely be …