This Log Buffer Edition dives deep into the ocean of blogosphere and surfaces with some cool blog posts from Oracle, SQL Server and MySQL.

Oracle:

• Lets Talk DB Perth
• The Fundamental Challenge of Computer System Performance
• Index Advanced Compression: Multi-Column Index
• Middleware Diagnostics Advisor (MDA) Setup
• Most people are now aware that in 12c, a …

Recently Aphyr (Kyle Kingsbury) published https://aphyr.com/posts/327-call-me-maybe-mariadb-galera-cluster

The article is technically valid, I am not going to dispute a conclusion Aphyr made, but it is also quite technically involved, so users who just jump to conclusion may get the wrong impression and we’re left with more questions than ever.

So, let me state what is the real conclusion of this article:
“Galera cluster does not support SNAPSHOT ISOLATION LEVEL, in contract to what was stated in the documentation”.
Following that conclusion is using Galera cluster may result in “corrupted” data.

I do not quite like the usage of the word “corrupted” here. For me, the more correct word be to use is “inconsistent”.

So with this clarification, the …

Ever get called out for a MySQL issue only to realize that there was no issue?  It was a false alarm from the monitor.  We sure have and it’s frustrating, especially at 3:00 or 4:00 in the morning!

Many DBAs work in an environment where there is some sort of first level support that gets assigned tickets first.  Unfortunately, many of the times these groups are, shall we say, less than skilled in MySQL.  As a result, they quickly escalate the ticket onto the primary on-call DBA, even when there is really nothing wrong.

Much of the time, there are multiple types of MySQL topology in these environments: standalone, galera cluster, replication, etc.  Writing large runbooks with detailed test cases can be a daunting process and one that will cause many first-level support engineers to give up and simply escalate the issue anyway.

In an effort to avoid undue call outs, we developed a simple bash …

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 …

http://blog.booking.com/abstracting_binlog_servers_and_mysql_master_promotion_wo_reconfiguring_slaves.html

Follow the link above to read my latest article on the Booking.com Developer Blog.  It is about Binlog Servers and how to promote a slave as the new master without reconfiguring all slaves.

This is also a good opportunity to remind you of my next talks:

I’ll be giving a talk about Binlog

MySQL-Sandbox is a great tool for testing a new release, and in fact this is what I do when a new MySQL tarball becomes available. I don't think many people are aware of the full testing capabilities of the sandbox, though.
When you think about testing, you may just think of creating a sandbox with the new tarball, and then hammering it with your pet procedure. That works, of course, as the main purpose of MySQL-Sandbox is to allow you to do just that. There is, however, a full test suite that can tell you in a short while if your tarball is compatible with the past or not.
This procedure is quite strict. It has happened several times that I caught a bug in a new release of MySQL, or Percona Server, or MariaDB, just by running this suite.
How MySQL-Sandbox gets testedBefore describing how to test, I would like to show what I do. When a new version of MySQL-Sandbox is ready …

Previous episodes:

• MySQL replication monitoring 101

MySQL replication in action - Part 1: GTID & CoMySQL replication in action - Part 2 - Fan-in topologyMySQL replication in action - Part 3 - All-masters P2P topologyMySQL replication in action - Part 4 - star and hybrid topologies
Parallel replication overviewOne …

In my last Booking.com Hackathon, I worked on MyISAM vs InnoDB for data loading (LOAD DATA IN FILE) and bulk index creation.  My motivation was the following: knowing that some are still using MyISAM for this particular use-case, I wanted to verify/understand if/why InnoDB is slower than MyISAM.  I do not yet have complete results on this specific subject but I found some interesting things that

I have now released version 1.2 of MyOraDump, my Oracle data extraction tool. This version has one new feature, which is transaction support for MySQL format exports which does speed up loading data a lot! Trust me, it really does! Also I have fixed a bug that did cause a crash at the end of the run, I have no idea why this didn't show up before, but there you go and now it is fixed.

MyOraDump 1.2 can be downloaded sourceforge, and as usual there is also a pdf only download if you want to read up on the tool before using it.

/Karlsson

Previous episodes:

• MySQL replication monitoring 101

MySQL replication in action - Part 1: GTID & CoMySQL replication in action - Part 2 - Fan-in topology


In the previous article, we saw the basics of establishing replication from multiple origins to the same destination. By extending that concept, we can deploy more complex topologies, such as the point-to-point (P2P) all-masters topology, a robust and …