December is half way through the budget year for the MySQL Community Team and we carefully meter out our small budget to make the most effective use from it. But December is also the time when existing conferences start the tasks of preparing for next year and brave souls who have never been part of a conference start out from scratch to create a new show. The MySQL Community Team would love to help with your conference.

First we need to know about your conference. We do scour the announcement sites like callingallpapers.com and lanyrd.com but your show may have been inadvertently skipped. Tell us the dates, the location, how many people you are expecting, your target audience (PHP Developers, DBAs, left handed actuaries from the Pacific Rim), and what makes your show unique (at least for your area). We spread the word about shows to …

Let’s say that you want to measure something in your database, and for that you need several operations to happen in parallel. If you have a capable programming language at your disposal (Perl, Python, Ruby, PHP, or Java would fit the bill) you can code a test that sends several transactions in parallel.

But if all you have is the shell and the mysql client, things can be trickier. Today I needed such a parallel result, and I only had mysql and bash to accomplish the task.

In the shell, it’s easy to run a loop:

for N in $(seq 1 10)
do
    mysql -h host1 -e "insert into sometable values($N)" 
done

But this does run queries sequentially, and each session will open and close before the next one starts. Therefore there is no concurrency at all.
Then I thought that the method for parallel execution in the shell is to run things in the background, and then collect the results. …

While troubleshooting deadlocks for a customer, I came around an interesting situation involving InnoDB gap locks. For a non-INSERT write operation where the WHERE clause does not match any row, I expected there should’ve been no locks to be held by the transaction, but I was wrong. Let’s take a look at this table and and example UPDATE.

mysql> SHOW CREATE TABLE preferences \G
*************************** 1. row ***************************
       Table: preferences
Create Table: CREATE TABLE `preferences` (
  `numericId` int(10) unsigned NOT NULL,
  `receiveNotifications` tinyint(1) DEFAULT NULL,
  PRIMARY KEY (`numericId`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
mysql> BEGIN;
Query OK, 0 rows affected (0.00 sec)
mysql> SELECT COUNT(*) FROM preferences;
+----------+
| COUNT(*) |
+----------+
|        0 |
+----------+
1 row in set …

As you probably already know, in MySQL 5.7.3 release, InnoDB Memcached reached a record of over 1 million QPS on read only workload. The overview of the benchmark and testing results can be seen in an earlier blog by Dimitri. In this blog, I will spend sometime on the detail changes we have made to achieve this record number.

First thanks to Facebook’s Yoshinori with his bug#70172 that brought our attention to this single commit read only load test. We have been focussing on operation with large batch size. This bug prompted us to do a series of optimization on single commit read only queries and these optimizations eliminated almost all major bottlenecks from the InnoDB Memcached plugin itself.

If you are just …

As you probably already know, in MySQL 5.7.3 release, InnoDB Memcached reached a record of over 1 million QPS on a read only load. The overview of the benchmark and testing results can be seen in an earlier blog by Dimitri. In this blog, I will spend sometime on the detail changes we have made to achieve this number.

First thanks to Facebook's Yoshinori with his bug#70172 that brought our attention to this single commit read only load test. We have been focussing on operation with large batch size. This bug prompted us to do a series of optimization on single commit read only queries and these optimizations eliminate almost all major bottlenecks from the InnoDB Memcached plugin itself.

If you are just …

Many users are challenged with how to setup multi-master, multi-site MySQL clusters. How to do you go from a single database server to a scalable cluster? Or move from a brittle MySQL replication system to a transparent, manageable database cluster? In this joint webinar with Continuent, Percona examines how Continuent Tungsten addresses these problems. 

First, we discuss the read-write

Don't look at an industry benchmark here, it's a real client story.

200 Billion records in a month and it should be transactional but not durable.

For regular workload we use LOAD DATA INFILE into partitioned InnoDB, but here we have estimated 15TB of RAID storage. This is a lot of disks and it can't no more stay inside a single server internal storage.

MariaDB 5.5 come with TokuDB storage engine for compression, but is it possible in the time frame impose by the workload?

We start benchmarking 380G of raw input data files,  6 Billion rows.

First let's check the compression with the dataset.


Great job my TokuDB 1/5, without tuning a single parameter other than durability! …

Devart is glad to announce the release of the new versions of dotConnect for MySQL and dotConnect for PostgreSQL - enhanced database connectivity solutions, built over the ADO.NET architecture, that support Entity Framework and LinqConnect ORM solutions. New versions of dotConnect data providers offer Windows Workflow Foundation Support.

Devart is glad to announce the release of the new versions of dotConnect for MySQL and dotConnect for PostgreSQL - enhanced database connectivity solutions, built over the ADO.NET architecture, that support Entity Framework and LinqConnect ORM solutions. New versions of dotConnect data providers offer Windows Workflow Foundation Support.

Part of an article originally published in the article MySQL Forks: Which one is right for me?, published in the June edition of php[architect]. The preceding portions of the article are available: A Brief History of MySQL Oracle MySQL Percona Server MariaDB Other Derivatives The MySQL ecosystem has never been stronger.  Oracle has responded to [...]