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Displaying posts with tag: MySQL Cluster (reset)
Two New MySQL Books!

There are two new MySQL books both from Apress Press. One is an in depth master course on the subject and the other is a quick introduction.


ProMySQL NDB Cluster is subtitled Master the MySQL Cluster Lifecycle and at nearly 700 pages it is vital resource to anyone that runs or is thinking about running NDB Cluster. The authors, Jesper Wisborg Krogh and Mikiya Okuno, have distilled their vast knowledge of this difficult subject in a detail packed but easily readable book.  MySQL Cluster is much more complex in many areas than a regular MySQL server and here you will find all those details. If you run MySQL NDB Cluster then you need this book. The partitioning information in chapter 2 is worth the price of the book alone.  I am only a third of the way …

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New Book: Pro MySQL NDB Cluster

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It is with great pleasure, I can announce that a new book dedicated to MySQL NDB Cluster has just been released. The book Pro MySQL NDB Cluster is written by my colleague Mikiya Okuno and myself and is a nearly 700 pages deep dive into the world of MySQL NDB Cluster. The book is published by Apress.

Tip: There are several ways to cluster MySQL. This book is about the product MySQL Cluster (often called MySQL NDB Cluster to clarify which cluster it is). There is also MySQL InnoDB Cluster, …

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MySQL Cluster Manager 1.4.4 released!


MySQL Cluster Manager 1.4.4 is now available for download from My Oracle Support.


What’s new?
With MCM 1.4.4 we continue to improve on MySQL Cluster Manager, specifically around:

  • the collect logs command
  • process status reporting
  • process command execution in specific scenarios


More details
More details are available in the MCM 1.4.4 Release Notes.…

MySQL Cluster Manager 1.4.3 released!


You might already have seen the announcement earlier this summer – we made MCM 1.4.3 available for download from My Oracle Support.


What’s new?
The most notable changes to MCM 1.4.3 include

  • Significant reduction in cpu consumption when idle.
  • Added support for running your mysqlds with skip-networking enabled.

Taming a ‘wild’ NDB 7.3 with Cluster Manager 1.4.3 & direct upgrade to 7.5.

Well, since working with outdated clusters and upgrade paths that quickly become obsolete, as in my last post, Migrating/importing NDB to Cluster Manager w/ version upgrade. , I wanted to share that we can also use Cluster Manager, mcm, to upgrade NDB Cluster from 7.3 directly to 7.5. So we can start using the mcm new features like autotune that help guide us towards some Cluster tuning, or 7.5 new features like READ_BACKUP or FULLY_REPLICATED tables. …

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Migrating/importing NDB to Cluster Manager w/ version upgrade.

I’ve had some questions from people using MySQL Cluster GPL and wanting to move to using MySQL Cluster Carrier Grade Edition, i.e., they want to use MySQL Cluster Manager, MCM, to make their lives much easier, in particular, upgrading (as well as config change ease and backup history).

All I want to do here is to share with you my personal experience on migrating what’s considered a ‘wild’ NDB Cluster to a MCM managed cluster. It’s just as simple to follow the manual chapter Importing a Cluster into MySQL Cluster Manager so at least you can see how I did it, and it might help someone.

[ If you’re not migrating but just looking for further information on NDB Cluster, and came across this post, please please PLEASE look at the …

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MySQL Documentation: Indexes in Release Notes

We've recently made a change "in the background", adding an index to each of our release note documents. For an (ample) example, look at the MySQL 5.7 release notes' index page.

The index should make it a lot easier for users to spot (and track) changes of particular features throughout the versions of a MySQL release series (for example, MySQL 5.7 or 8.0).

Release note indexes are automatically updated as new changelogs are created; this is one of the advantages of our highly automated documentation infrastructure -- keeping indexes updated manually would simply not be possible.

Update (2017-07-03): New screenshot, reflecting more readable / less cluttered links to individual release notes.

Working Around MySQL Cluster Push Down Limitations Using Subqueries

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This post was originally published on the MySQL Support Team Blog at https://blogs.oracle.com/mysqlsupport/entry/working_around_mysql_cluster_push on 5 August 2016.

I worked on an issue recently where a query was too slow when executed in MySQL Cluster. The issue was that Cluster has some restrictions when it comes to push down conditions.

As an example of this, consider the following query using the employees sample database. The query takes a look at the average salary based on how many years the employee has been with the company. As the latest hire date in the database is in January 2000, the query uses 1 February 2000 as the reference date.

Initially the query performs like (performance is with two data …

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Handy stored procedure for regular DBA tasks

As a stored procedures fan, I use MySQL stored procedures to get some of my DBA tasks accomplished. To make it simple, I have a template stored procedure that can be customized for several purposes.
The template syntax contains cursor, continue handler, loop, if condition and prepared statement. Thought it may be useful for others – at least, who are searching for the MySQL Stored Procedure syntax – so I’m publishing this post!

Use case: Reorganize tables partition:

In MySQL Cluster, it is required to reorganize all NDB tables’ partitions after adding new data nodes to rebalance the data across all nodes. Also the tables need to be optimized afterwards to reclaim the memory space. For this task I use the following procedure:

DROP PROCEDURE IF EXISTS reorganize_tables;
DELIMITER //
CREATE PROCEDURE reorganize_tables (IN db_name VARCHAR(50))
BEGIN

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MySQL Cluster Manager 1.4.2 released!


MySQL Cluster Manager 1.4.2 is now available for download from My Oracle Support.


In this blog post we will highlight some of the details of the MCM 1.4.2 release.

Progress reporting
First, some eye candy. With MCM 1.4.2 we added simple progress reporting.…

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