This week we explain performance_schema a bit deeper. In Ear Candy, we talk about max_binlog_cache_size and At the Movies presents Max Mether of SkySQL talking about "High Availability Solutions for MySQL".

Events
DB Hangops - every other Wednesay at noon Pacific time
Upcoming MySQL events (http://www.mysql.com/news-and-events/events/)

Training
SkySQL Trainings
Tungsten University trainings

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Thanks to Tim Callaghan for speaking Tuesday night at the Effective MySQL New York meetup on Fractal Tree Indexes : Theory and Practice (MySQL and MongoDB). There was a good turnout and a full room to learn how the TokuDB storage engine from Tokutek is changing how to handle big data in MySQL.

Also interesting is how the same technology has been applied for use in MongoDB including giving MongoDB transactions; a big change for NoSQL.

Related News: Tokutek Meets Big Data Demand With Open Source TokuDB

This week we discuss the basics of using the performance schema in MySQL 5.5 and 5.6. Ear Candy is about a temporal gotcha when using dates and times that do not exist, and At the Movies is David Stokes giving some useful for System Administrators who also are in a DBA role.

News
Continuent's Tungsten Replicator is now completely open source
TokuDB is now open source

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This week we discuss Tungsten and MySQL 5.6 replication with friend of the show, Giuseppe Maxia (aka the Data Charmer). Ear Candy is MariaDB's Cassandra storage engine, and At the Movies is Giuseppe's "MySQL 5.6 Replication – features and usability" video from Open Database Camp.

Events
DB Hangops in May will be Wed May 8th and 22nd.
Upcoming MySQL tech tours (http://www.mysql.com/news-and-events/events/)

Training
SkySQL Trainings
Tungsten University trainings

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Back when the first version of the MariaDB Java Client was released, someone asked in the comments about the performance characteristics of the driver compared to ConnectorJ. I answered with hand-waving, saying that nobody does anything stupid, the performance of the drivers would be roughly the same, but I promised to measure it and tell the world one day. And now that day has come. The day where three MySQL JDBC drivers (ConnectorJ, MariaDB JDBC, and Drizzle JDBC) are compared against each other. Unlike the server, which gets benchmarking attention all the time, there is no standard benchmark for connectors, so I needed to improvise, while trying to keep the overhead of the server minimal. So I did something very primitive to start. I used my two favorite queries:

• DO 1 — this one does not retrieve a result set, and thus can be seen as a small

When dealing with high performance, low latency storage devices, such as SSD cards, one finds bottlenecks in new places. This is a story about such a bottle neck and how to work around it.

One unique feature of InnoDB is the double write buffer. This buffer was implemented to recover from half-written pages. This can happen in case of a power failure while InnoDB is writing a page (16KB = 32 sectors) to disk. On reading that page, InnoDB would be able to discover the corruption from the mismatch of the page checksum. However in order to recover, an intact copy of the page would be needed.

The double write buffer provides such a copy. Whenever InnoDB flushes a page to disk, it is first written to the double write buffer. Only when the buffer is

We discuss INFORMATION_SCHEMA with plenty of examples on useful queries. In this week's Ear Candy, we talk about resident versus virtual memory on Linux, and in At the Movies has a video about MongoDB.

Events
DB Hangops in May will be Wed May 8th and 22nd noon pacific time.
Upcoming MySQL tech tours (http://www.mysql.com/news-and-events/events/)

Training
SkySQL Trainings
Tungsten University trainings

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A few weeks ago I wrote about “MySQL Performance at High Concurrency” and why it is important, which was followed up by Vadim’s post on ThreadPool in Percona Server providing some great illustration on the topic. This time I want to target an opposite question: why MySQL performance at low concurrency is important for you.

I decided to write about this topic as a number of recent blog

Percona’s Kenny Gryp leads a recent MySQL workshop

Percona will be in Chicago and London the week of April 8th delivering two 2-day MySQL workshops. For our MPB readers, we are offering a 15% discount. Just use MPB15A when purchasing your tickets to one or both MySQL workshops.

• Scaling and Optimization for MySQL on Monday & Tuesday, April 8 & 9
  • This MySQL workshop

This week we discuss changed behavior of variables in MySQL 5.6. In ear candy we talk about a cloud-based service to play with SQL on different databases, and At the Movies is Stewart Smith of Percona talking about MySQL in the Cloud as a Service during Linux Conf Australia in Canberra.

Changed behavior of variables in 5.6
boolean variables can be set to ON/OFF 1/0 TRUE/FALSE

Variables with changes:
log_slave_updates

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Oracle has now launched MySQL-5.6.10-GA, so it is time to come up with some new benchmark results. The test candidates in this benchmark run are

• MySQL-5.5.29
• MySQL-5.6.10
• MariaDB-5.5.28a
• MariaDB-10.0.1

The 5.5 versions are in because I wanted to check for any regressions. In the past we have often seen performance regressions in newer versions which were caused by new features.

This time the benchmark was run on a different box. The main difference is that this box does not have SSD but a high performance RAID-5 with 512M of battery-backed cache. Besides that the machine has 16 cores out of which 12 were used for mysqld and the other 4 for sysbench.

The benchmark uses sysbench-0.5 OLTP with 8 tables and 10G worth of data. InnoDB buffer pool was 16G, InnoDB log group capacity 4G (the maximum for MySQL-5.5). The

This week we begin to discuss replication features in MySQL 5.6. Ear Candy is a LOAD DATA INFILE bug and using CSV to get beyond it; At the Movies is Suzan Bond talking about "The Art of Self-Sourcing".

Events
Oracle's doing more MySQL tech tours. These seminars will be in the mornings, and are free. They will be on:
Tuesday, February 19th in Petach Tikva, Israel
Thursday, February 21st in Oslo and Brussels

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Recently we have helped our customer to migrate their entire application stack from one data center to another. Before we were brought on-board, customer had already placed an order for a new set of servers with the new hosting provider. All of them were suppose to be high-end systems – many CPU cores, plenty of RAM and RAID array build on top of SSD drives. As the new machines started being available to us, we began setting up the new environment. At some point it turned out that the new machines were actually slower compared to the several year old systems and their load was much higher under comparable traffic.

We examined several of the new servers and each time the conclusion was that the problems were related poor I/O performance. In the benchmarks a RAID 10 array