Continuing from our April 2015 release of the VMware Continuent 4.0 products is a new 4.0.1 release that provides important fixes to both the replication and MySQL clustering.For full details, read the full release notes, available at the links below, but the highlights are as follows: VMware Continuent for Replication and Data Warehousing
Expanded support for EBS Snapshots to enable MySQL table
Today Percona announced the immediate availability of 24/7, enterprise-class support for MongoDB and TokuMX. The new support service helps organizations achieve maximum application performance without database bloat. Customers have round-the-clock access (365 days a year) to the most trusted team of database experts in the open source community.
The news means that Percona now offers support across the entire open-source database ecosystem, including the entire LAMP stack (Linux, Apache, MySQL, and PHP/Python/Perl), providing a single, expert, proven service provider for companies to turn to in good times (always best to be proactive) – and during emergencies, too.
Today’s support announcement follows …
[Read more]Welcome to MySQL QA Episode #7 – Reducing Testcases for Beginners: single-threaded reducer.sh!
In this episode we’ll learn how to use reducer.sh. Topics discussed;
Are your databases more costly than they need to be? If you’re not sure, this webinar will show you how to find out, quickly and easily, with KPIs that indicate overprovisioning or opportunity for driving more efficiency from your databases. If there is an opportunity to run your databases at lower cost, you’ll find out how to identify which of 5 key areas offer the biggest chances for improvement, and a specific action plan to get results fast.
If you did not have a chance to join the webinar, the slide deck is embedded below. You can also register for a recording here.
If you are in the Austin area on July 27, join the MySQL Group, Data Geeks and Devops meetups at RackSpace from 6:30 - 8:45.
In this talk Baron Schwartz, renowned MySQL performance expert and all-around database guru, will explain why your database’s performance is a lot less important to your business than the way you structure your engineering team. The interesting thing is that a lot of the most serious team, communication, and process bottlenecks in your business (the ones that make you miss ship deadlines, crash the site, and lose your best team members after repeated all-nighters) are actually driven by database issues, but not the way you think they are. And the …
[Read more]Here at VividCortex, it can be exciting (and humbling) to take an occasional step back and revisit some of the great work that’s been done in our offices over the past couple of years. Our blog in particular has grown quite a lot. We’re finally at a point where we can look over the steady stream of articles we’ve published and the manifold topics covered, and we can point to a few in particular and say, “Niiiiice.” But our opinions don’t count for much – it’s you, the faithful VividCortex blog readers, whose say-so really matters. What is it that you’ve found most interesting, most helpful, and most enjoyable in our archives?
Without further ado, here are the VividCortex Blog’s 12 most popular blog posts of all time, as selected by your own readerly eyeballs, organized by topic.
Go
By a long, long shot, our perennially most popular topic is Google’s Go language and our various considerations …
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Before proceeding installation things , go through cluster basics
from the MySQL website and forums. It will be helpful to easily
understand installation and configuration. First time is
difficult to get things to done in one shot is not possible , no
problem will learn it .
MySQL Cluster Installation will be mostly done by two ways.,
Different Linux flavors has different methods to
install format , here I have explaining with CentOS7
.
1.Have prepared two different machines to install MySQL
Cluster . First you have to login two different
machines
| Two VM Machines |
…
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Valgrind's helgrind tool identifies data races and lock
deadlocks in multi-threaded programs. Since the MySQL
server is a multi-threaded program, can helgrind find any issues
in the MySQL server?
A simple test that does nothing except start up the MySQL server
and shut it down is run on the MySQL test suite with memcheck and with helgrind. For this simple test
on MySQL 5.7.7, the memcheck run is nice and
clean but the …
MySQL ERROR 1018 (HY000): Can't read dir of './sakila/' (errno: 13 - Permission denied) caused due to moving database to a different partition and using softlink on CentOS and it's fix for SELinux.
The post MySQL Permission denied error 13 and solution first appeared on Change Is Inevitable.
Houston, we have a problem. Google search for “What is innodb history list length?” and you get a bunch of nonsense mixed in with correct information, and it’s hard to tell which information is right. Let’s fix this.
What is InnoDB History, Anyway?
InnoDB is an MVCC storage engine, which means you can start a transaction and continue to see a consistent snapshot even as the data changes. This is implemented by keeping old versions of rows as they are modified.
They’re kept in a linked list. The most recent version points to the previous one, which points to the previous one, and so on. Each version has a transaction ID with it so when InnoDB goes looking for a row, it compares your current transaction ID to the row version and selects the right one for you. This can be done without locking.
MVCC is …
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