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Log Buffer #412, A Carnival of the Vanities for DBAs
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This Log Buffer Edition makes it way through the realms of Oracle, SQL Server and MySQL and brings you some of the blog posts.


Introducing Oracle Big Data Discovery Part 3: Data Exploration and Visualization


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MySQL Replication and GTID-based failover - A Deep Dive into Errant Transactions
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For years, MySQL replication used to be based on binary log events - all a slave knew was the exact event and the exact position it just read from the master. Any single transaction from a master may have ended in different binary logs, and in different positions in these logs. It was a simple solution that came with limitations - more complex topology changes could require an admin to stop replication on the hosts involved. Or these changes could cause some other issues, e.g., a slave couldn’t be moved down the replication chain without time-consuming rebuild process (we couldn’t easily change replication from A -> B …

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3 handy tools to remove problematic MySQL processes
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DBAs often encounter situations where they need to kill queries to ensure there are no long-running queries on a MySQL server that would impact performance. Long-running queries can be the result of many factors. Fortunately, Percona Server contains some handy tools to remove problematic MySQL processes. I will highlight all of the tools via some examples in this post.

There have been some good posts on this blog about the pt-kill tool, like this one by Arunjith Aravindan titled “ …

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Baron Schwartz Presents on Time-Series Data at Scale13X
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This past weekend we had the pleasure of attending Scale13X in Los Angeles. It was full of great conversations with solid people, and it was nice to escape the winter cold for a couple days.

Baron Schwartz presented on VivdCortex’s approach to building a time-series database in MySQL. The talk is titled Scaling VividCortex’s Big Data Systems on MySQL, and the recording and video can be seen here. If you are not automaticaly directed, Baron’s presentation begins at 5:49:00.

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OurSQL Episode 205: How to Learn About MySQL
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In this episode, we discuss resources available for learning more about MySQL and its forks.

MySQL Cluster 7.4 is GA!
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The General Availability of MySQL Cluster 7.4 has just been announced by Oracle.

The MySQL team at Oracle are excited to announce the General Availability of MySQL Cluster 7.4, ready for production workloads.

MySQL Cluster 7.4.4 can be downloaded from and the …

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Connector/Python 2.1.1 Alpha released with C Extension
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MySQL Connector/Python 2.1.1 took a while to release and that was because we had to add some more packages which contains the optional C Extension. Note that this is still Alpha and we want you guys to report any problems and requests.

The Connector/Python C Extension was added because in certain situations, for example reading a huge result set, can take a long time with pure Python. That’s why we choose to interface with …

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Worrying about the ‘InnoDB: detected cycle in LRU for buffer pool (…)’ message?
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If you use Percona Server 5.5 and you have configured it to use multiple buffer pool instances than sooner or later you’ll see the following lines on the server’s error log and chances are you’ll be worried about them:

InnoDB: detected cycle in LRU for buffer pool 5, skipping to next buffer pool.
InnoDB: detected cycle in LRU for buffer pool 3, skipping to next buffer pool.
InnoDB: detected cycle in LRU for buffer pool 7, skipping to next buffer pool.

Worry not as this is mostly harmless. It’s becoming a February tradition for me (Fernando) to face a question about this subject (ok, …

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See Connection Latency with VividCortex
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Recently, one of our customers reached out to us about a problem they were having trouble diagnosing - they noticed that every once in a while, it took their MySQL server a few seconds to initialize a client connection. They had figured out that the issue was a missing hosts entry for one of their clients, but VividCortex didn’t have any measurements to show this issue to them.

We always enjoy getting customer feedback, and in this case we saw a clear need for something that VividCortex was missing. To address this shortcoming, we’ve recently added the ability to see the connection latency for newly established connections against your …

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MySQL Cluster 7.4 GA: 200 Million QPS, Active-Active Geographic Replication and more
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The MySQL team at Oracle are excited to announce the General Availability of MySQL Cluster 7.4, in other words - it's now ready for production workloads.

This is a release which takes what was already great about MySQL Cluster (real-time performance through memory-optimized tables, linear scale-out with transparrent sharding and cross-shard joins, High Availability and SQL as well as NoSQL interfaces) and makes it even faster, easier to manage and simpler to run accross geographies.

Showing entries 1 to 10 of 34038 10 Older Entries

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