So, you’ve been working with MySQL for a while and now are being asked to manage it. Perhaps your primary job description is not about support and maintenance of the company’s databases (and data!), but now you’re expected to properly maintain one or more MySQL instances. It is not uncommon that developers, or network/system administrators, or DevOps folks with general backgrounds, find themselves in this role at some point in their career. 

So, what does a DBA do? We know that a DBA manages the company’s databases, what does that mean? In this series of posts, we’ll walk you through the daily database operations that a DBA does (or at least ought to!).

We plan on covering the following topics, but do let us know if we’ve missed something:

• Monitoring tools
• Trending
• Periodical healthchecks
• Backup handling
• High Availability
• Common …

Percona is glad to announce the new release of Percona XtraDB Cluster 5.6 on June 3rd 2015. Binaries are available from downloads area or from our software repositories.

Based on Percona Server 5.6.24-72.2 including all the bug fixes in it, Galera Replicator 3.11, and on …

A quick question, which I’ve asked once before –

if you were an Oracle DBA, then learned MySQL, what do you wish you knew before you got started?

Also, what was helpful to you as you learned?  (Websites, #mysql on irc, documents, etc.)  What do you wish you had (or want to have now) if you are a DBA for both Oracle databases and MySQL databases?

Ie, what would be good to give an Oracle DBA who wants to start learning or supporting MySQL as well?  Please respond with comments here, or directly email me at ben-dot-krug-at-oracle-dot-com.

Thanks!

English: Madrid MySQL Users Group will be holding their next meeting on 17th June at 18:00h at EIE Spain in Madrid. Dimitri Vanoverbeke and Stéphane Combaudon from Percona will be offering two presentations for us: Practical MySQL optimisations Galera Cluster – introduction and where it fits in the MySQL eco-system I think this is an excellent moment … Continue reading MMUG13: Practical MySQL Optimisation y Galera Cluster presentations

The post MMUG13: Practical MySQL Optimisation y Galera Cluster presentations first appeared on Simon J Mudd's Blog.

In the MySQL ecosystem there are few load balancers there are also open-source, and ProxySQL is one of the few proxies that works at the application layer and therefore is SQL aware.
In this blog post we will benchmark ProxySQL against MaxScale, another popular proxy for MySQL.
The idea to compare ProxySQL vs MaxScale came after reading an interesting blog post of Krzysztof Książek on SQL Load Balancing Benchmark, comparing performance of MaxScale vs HAProxy.

Disclaimer: ProxySQL is not GA yet, therefore please do not use it in production.



Sysbench setupI wanted to setup a similar sysbench setup to what Krzysztof used in his benchmark, but it is slightly different:
a) instead of using a MySQL cluster with Galera, I setup a cluster with 1 master …

Following the release of ClusterControl 1.2.10 a week ago, we are excited to demonstrate this latest version of the product on Tuesday next week, June 9th.

Join our CTO, Johan Andersson, who will be discussing and demonstrating the new ClusterControl DSL, Integrated Developer Studio and Database Advisors, which are some of the cool new features we’ve introduced with ClusterControl 1.2.10.

New Features Webinar: ClusterControl 1.2.10

DATE & TIME

Europe/MEA/APAC
Tuesday, June 9th at 09:00 (UK) / 10:00 CEST (Germany, France, Sweden)
…

Some applications have a heavy write workload on a few records – for instance when incrementing a global counter: this is called a write hotspot. Because you cannot update the same row simultaneously from multiple threads, this can lead to performance degradation. When using Percona XtraDB Cluster (PXC), some users try to solve this specific issue by writing on multiple nodes at the same time. Good idea or bad idea? Read on!

Simultaneous writes on a standalone InnoDB server

Say you have these 3 transactions being run simultaneously (id is the primary key of the table):

# T1
UPDATE t SET ... WHERE id = 100
# T2
UPDATE t SET ... WHERE id = 100
# T3
UPDATE t SET ... WHERE id = 101

All transactions will require a row lock on the record they want to modify. So T3 can commit at the same time than T1 and/or T2, because it will …

When I started writing this post I planned to follow up on my series of posts by creating a unique constraint with more than 16 columns using a MariaDB virtual column the same way I used a MySQL generated column in my most recent post. During my testing I abandoned that plan when I discovered two things:

1. MariaDB virtual columns impose a 252 character limit on the expression that defines …

Tue, 2015-06-02 19:07geoff_montee_g

Most MariaDB users are probably aware of the privilege system available in MariaDB and MySQL. Privileges control what databases, tables, columns, procedures, and functions a particular user account can access. For example, if an application stored credit card data in the database, this data should probably be protected from most users. To make that happen, the DBA might disallow access to the table or column storing this sensitive data.

However, sometimes the privilege system isn't sufficient to secure data. Sometimes data needs to be secured beyond tables and columns. In those cases, row-level security (sometimes abbreviated RLS) may be necessary. Possible use cases for row-level security are:

• A government agency might only allow a user to see a row based on classification (CONFIDENTIAL, …

In my previous post, I showed you a way to store tweets in MySQL, and then use Perl to automatically publish them on Twitter.

In this post, we will look at automatically sending a “thank you” to people who retweet your tweets — and we will be using Perl and MySQL again.

Just like in the first post, you will need to register your application with Twitter via apps.twitter.com, and obtain the following:

consumer_key
consumer_secret
access_token
access_token_secret

One caveat: Twitter has a rate limit on how often you may connect with your application — depending upon what you are trying to do. See the Rate Limiting and …