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Looking out for max values in integer-based columns in MySQL
Yay! My first blog post! As long as at least 1 person finds it useful, I’ve done my job. Recently, one of my long-term clients was noticing that while their INSERTs were succeeding, a particular column...
View ArticleTIMESTAMP Columns, Amazon RDS 5.6, and You
This comes from an issue that I worked on recently, wherein a customer reported that their application was working fine under stock MySQL 5.6 but producing erroneous results when they tried running it...
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Check for MySQL slave lag with Percona Toolkit plugin for Tungsten Replicator
A while back, I made some changes to the plugin interface for pt-online-schema-change which allows custom replication checks to be written. As I was adding this functionality, I also added the --plugin...
View ArticleTokuDB gotchas: slow INFORMATION_SCHEMA TABLES
We are using Percona Server + TokuDB engine extensively in Percona Cloud Tools and getting real usage operational experience with this engine. So I want to share some findings we came across, in hope...
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Managing shards of MySQL databases with MySQL Fabric
This is the fourth post in our MySQL Fabric series. In case you’re joining us now, we started with an introductory post, and then discussed High Availability (HA) using MySQL Fabric here (Part 1) and...
View ArticleSystemtap solves phantom MySQLd SIGTERM / SIGKILL issue
The Percona Managed Services team recently faced a somewhat peculiar client issue. We’d receive pages about their MySQL service being unreachable. However, studying the logs showed nothing out of the...
View ArticleA schema change inconsistency with Galera Cluster for MySQL
I recently worked on a case where one node of a Galera cluster had its schema desynchronized with the other nodes. And that was although Total Order Isolation method was in effect to perform the schema...
View ArticleReference architecture for a write-intensive MySQL deployment
We designed Percona Cloud Tools (both hardware and software setup) to handle a very high-intensive MySQL write workload. For example, we already observe inserts of 1bln+ datapoints per day. So I wanted...
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Monitoring MySQL flow control in Percona XtraDB Cluster 5.6
Monitoring flow control in a Galera cluster is very important. If you do not, you will not understand why writes may sometimes be stalled. Percona XtraDB Cluster 5.6 provides 2 status variables for...
View ArticleWhat I learned while migrating a customer MySQL installation to Amazon RDS
Hi, I recently had the experience of assisting with a migration of a customer MySQL installation to Amazon RDS (Relational Database Service). Amazon RDS is a great platform for hosting your MySQL...
View ArticlePrevent MySQL downtime: Set max_user_connections
One of the common causes of downtime with MySQL is running out of connections. Have you ever seen this error? “ERROR 1040 (00000): Too many connections.” If you’re working with MySQL long enough you...
View ArticleExamining the TokuDB MySQL storage engine file structure
As we know different storage engines in MySQL have different file structures. Every table in MySQL 5.6 must have a .frm file in the database directory matching the table name. But where the rest of the...
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Advanced MySQL Query Tuning (Aug. 6) and MySQL 5.6 Performance Schema (Aug....
I will be presenting two webinars in August:Aug 6, 10 a.m. PDT: Advanced Query Tuning in MySQL 5.6 and BeyondAug 13, 10 a.m. PDT: Using Performance Schema to Monitor and Troubleshoot MySQL 5.6This...
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Q&A: Putting MySQL Fabric to use
Martin Arrieta and I gave an online presentation last week on “Putting MySQL Fabric To Use.” If you missed it, you can find a recording and the slides here, and the vagrant environment we used plus a...
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Benchmarking IBM eXFlash™ DIMM with sysbench fileio
Diablo Technologies engaged Percona to benchmark IBM eXFlash™ DIMMs in various aspects. An eXFlash™ DIMM itself is quite an interesting piece of technology. In a nutshell, it’s flash storage, which you...
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Make a difference! See the world! Speak at Percona Live London; Santa Clara!
Twice each year members of the global open-source community converge on London in November and Santa Clara in April to network with, and learn from, some of the world’s most experienced and...
View ArticleMeasuring failover time for ScaleArc load balancer
ScaleArc hired Percona to benchmark failover times for the ScaleArc database traffic management software in different scenarios. We tested failover times for various clustered setups, where ScaleArc...
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5 great new features from Percona Cloud Tools for MySQL
It’s been three months since we announced anything for Percona Cloud Tools, not because we’ve been idle but because we’ve been so busy the time flew by! Here’s the TL;DR to pique your interest:EXPLAIN...
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How to use MySQL Global Transaction IDs (GTIDs) in production
Reconfiguring replication has always been a challenge with MySQL. Each time the replication topology has to be changed, the process is tedious and error-prone because finding the correct binlog...
View ArticleA closer look at the MySQL ibdata1 disk space issue and big tables
A recurring and very common customer issue seen here at the Percona Support team involves how to make the ibdata1 file “shrink” within MySQL. I can only imagine there’s a degree of regret by some of...
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