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MySQL Feed

Oracle MySQL resources, news, and support articles.

San Diego Users Group

Come join the San Diego MySQL Users group on August 2nd for a look at MySQL 5.6 and help make some pizza disappear. The presentation will start at 7PM and all are welcome. San Diego USers Group will meet August 2nd

Oracle Office
9515 Towne Center Drive
San Diego, CA 92121

On stored routines and dynamic statements

I very much enjoyed reading Overloading Procedures by Michael McLaughlin: good stuff!

Using innodb_sys_tables and innodb_sys_indexes

I was playing with Percona Server today and found fast_index_creation does not work quite exactly like described in the manual. The point I’m looking to make though it would be very hard to catch this problem without additional
information_schema tables we added in Percona Server.

Release 1.0.1 of Percona Monitoring Plugins

Version 1.0.1 of the Percona Monitoring Plugins is released. This is a routine bug-fix release that addresses several minor issues.

Comparing Percona XtraDB Cluster with Semi-Sync replication Cross-WAN

I have a customer who is considering Percona XtraDB Cluster (PXC) in a two colo WAN environment.  They wanted me to do a test comparing PXC against semi-synchronous replication to see how they stack up against each other.

Test Environment

The test environment included AWS EC2 nodes in US-East and US-West (Oregon).  The ping RTT latency between these nodes was right around 100ms.

Percona Toolkit versions 2.0.5 and 2.1.2 released

The Percona Toolkit team is happy to announce the release of Percona Toolkit versions 2.0.5 and 2.1.2. These are bug-fix releases in the 2.0 and 2.1 series, respectively. These releases fix many dozens of bugs, and we suggest that users upgrade to the latest versions of the tools.

The complete list of changes is on Launchpad for 2.0.5 and 2.1.2. Here are some highlights of the changes in version 2.1.2, which is the current development focus:

CHAR and spaces

I know about it, I knew about it all along, but... it's so easy to fall for it; there's just so much absurdity!

A CHAR type has a known number of characters. For example, the column:

CountryCode CHAR(3) CHARSET ascii NOT NULL

- is known to have exactly three characters. These could be 'USA', 'FRA', etc.

NO Security vulnerability in Percona Server / XtraDB Cluster provided binaries

Many of you heard of this nasty security vulnerability in MySQL, and as we are getting a lot of inquiries how does it affect Percona Server, I decided to address it in this post.

Things I’m looking forward to in MySQL 5.6

As a tool author, I really look forward to working with MySQL 5.6. Many of the improvements will make life significantly easier for Percona Toolkit.

One illustration of this is in figuring out what the optimizer is doing when it plans a statement, and how it intends to use indexes. Compound indexes present challenges in some situations. Many of our tools have extensive checks to try to avoid executing queries that have bad execution plans. If the optimizer intends to use only a few of the columns in an index, how will we know?

REPOST: A Tragically Comedic Security Flaw in MySQL

“In short, if you try to authenticate to a MySQL server affected by this flaw, there is a chance it will accept your password even if the wrong one was supplied. The following one-liner in bash will provide access to an affected MySQL server as the root user account, without actually knowing the password.”

$ for i in `seq 1 1000`; do mysql -u root --password=bad -h 2>/dev/null; done

The following are confirmed distributions that are vulnerable:

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