One of the key features of MySQL Group Replication is its distributed recovery mechanism. Whenever a new member joins a server group, making use of this plugin component, it reaches to a suitable donor and fetches the data that it misses up until the point it is declared online.…

I am attending Percona Live Amsterdam 2015 on September 21-23, 2015.

I will be on stage three times:

• September 22nd at 2:10pm Pivot tables: analytics in pure SQL
• September 23rd at 2:10pm The future of replication is today: new features in practice
• September 23rd at 5:10pm as host and speaker in the Lightning talks

My first talk is a topic that has ben among my favorites for long time: I published an article about it in 2001, and several …

Several reports we’re published in the news about how easy it is to access data stored in some NoSQL systems, including MongoDB. This is not surprising because security was rather relaxed in earlier versions of MongoDB . This post lists some of the common vulnerabilities in MongoDB and Percona TokuMX.

Network Security

One key point is to ensure that the bind_ip setting is correctly adjusted: in MongoDB 2.4 and Percona TokuMX, it is not set which means that the server will listen to all available network interfaces. If proper firewall rules (iptables, Security Groups in AWS, …) are not in place, your dataset could easily be queried from anywhere in the world!

In MongoDB 2.6+, bind_ip is set by default to 127.0.0.1 in the official .deb and .rpm packages. This is great from a security point of view, but remember that you’ll still have to adjust the setting if the application servers are not …

Thanks to all who attended my webinar last week on Writing Application Code for MySQL High Availability.  This blog is for me to address the extra questions I didn’t have time to answer on the stream.

What do you think about using Galera Cluster but writing to a single Node with LVS ?

Whatever HA strategy you like that can present  a layer 3 or layer 4 to your application tier is fine.  A lot of people using PXC us it in a single-writer (master/slave) kind of way.

Is there any way we can determine slave lag and then decide to use weather master or slave? for e.g. instead of using query to find if data is available in slave then …. use if lag_time < xyz?

One of my main points was that this is usually more expensive to implement inside your application code than it …

The Sakila sample database was created almost 10 years ago, as a sample set of data for MySQL courses and examples.

The database was developed by MySQL employees, with substantial contributions form the community.

Recently, the database was updated to use some of the features in MySQL 5.7. As a result, we had two sets of samples, one to use with MySQL 5.0+, and one that only loads with MySQL 5.7.

I filed a feature request, offering a patch to use conditional schema and data changes, which was incorporated very quickly into the official release.

The current release, available within the …

MySQL sys version 1.5.0 has just been released.

It has significant contributions from both external contributors (thank you Daniël and Shlomi) and internal (thank you Jesper and Morgan). Jesper particularly made many significant improvements in this release.

Here’s a full summary of the changes:

Improvements

• The `format_bytes` function now shows no decimal places when outputting a simple bytes value
• The `processlist`/`x$processlist` views where improved, changes include:
  • The `pid` and `program_name` of the connection are shown, if set within the `performance_schema.session_connect_attrs` table (Contributed by Daniël van Eeden)
  • Issue #50 – The current statement progress is reported via …

In 0.5.0 version of MySQL Group Replication plugin, we have introduced the Auto-increment configuration/handling feature through which auto increment variables (auto_increment_increment and auto_increment_offset) are auto configured by the plugin, so that different members of the group don’t generate duplicated auto increment values.…

When MySQL 5.7.8 is built and run with the Thread Sanitizer, one of the first issues reported is a data race with MySQL's use of pthread barrier wait and pthread barrier destroy.   The data race report is:

WARNING: ThreadSanitizer: data race (pid=30104)   Write of size 1 at 0x7ffd33054298 by main thread:     #0 pthread_barrier_destroy /home/rfp/llvm/projects/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc:1236 (mysqld+0x000000d5a71b)     #1 start_helper_thread …

Auditing your database means tracking access and changes to your data and db objects. The Audit Log Plugin has been shipped with Percona Server since 5.5.37/5.6.17, for a little over 12 months. Prior to the Audit Log Plugin, you had to work in darker ways to achieve some incarnation of an audit trail.

We have seen attempts at creating audit trails using approaches such as ‘sniffing the wire’, init files, in-schema ‘on update’ fields, triggers, proxies and trying to parse the traditional logs of MySQL (slow, general, binary, error). All of these attempts miss a piece of the pie, i.e. if you’re sniffing tcp traffic you’ll miss local connections, parsing binary logs you’re missing any reads. Your reasons for audit logging might be down to compliance requirements (HIPAA, PCI DSS) or you may need a way to examine database activity or track the connections incoming.

Over the past …

Download MariaDB 10.1.7

Release Notes Changelog What is MariaDB 10.1?

MariaDB APT and YUM Repository Configuration Generator

The MariaDB project is pleased to announce the immediate availability of MariaDB 10.1.7. This is a Release Candidate (RC) release.

See the …