We have gathered  Galera related presentations for you to choose from (click the title for more information)

Big Transactions on Galera Cluster,  15 April 2:00PM – 2:50PM @ Ballroom B (click here for more info)

Seppo Jaakola,  CEO, Codership

Big and long term transactions have traditionally not behaved well in Galera Cluster. Large replication data sets have resulted in symptoms like elevated conflict rate, increased memory consumption, even OOM kill may happen, flow control pausing, cluster freezing… To deal with these issues, Galera users have been adviced to split large transactions in “reasonable size”. There is also cluster configuration option for rejecting too large transactions, as a safe guard.

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January 30, 2015 By Severalnines

Thanks to everyone who participated in these two sessions this week! Please see below for details on next week’s follow up session 'Performance Tuning for HAProxy & MySQL'.

The topics covered this week included: 

• What is HAProxy?
• SQL Load balancing for MySQL
• Failure detection using MySQL health checks
• High Availability with Keepalived and Virtual IP
• Use cases: MySQL/MariaDB Galera Cluster, MySQL NDB Cluster …

Following on the heels of last week’s update to the Java client, the MariaDB project is pleased to today announce updates to both MariaDB Connector/C and Connector/ODBC. They are both Stable (GA) releases.

See the Release Notes and Changelogs for detailed information on each of these releases and contain many bug fixes and enhancements.

Download Connector/C 2.1.0

Release Notes Changelog

About MariaDB Connector/C

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This Log Buffer Edition covers various innovative blog posts from various fields of Oracle, MySQL and SQL Server. Enjoy!!!

Oracle:

A user reported an ORA-01114 and an ORA-27069 in a 3rd party application running against an Oracle 11.1 database.

Oracle SOA Suite 12c: Multithreaded instance purging with the Java API.

Oracle GoldenGate for Oracle Database has introduced several features in Release 12.1.2.1.0.

Upgrade to 12c and Plugin – one fast …

Users seeking high availability, disaster recovery and zero downtime maintenance operation for business-critical MySQL applications face confusing choices. Is multi-master or master/slave clustering better? What about synchronous versus asynchronous replication? Using a plain vanilla, stock MySQL or a modified version of it? Which of these choices are right for data-driven businesses that

Download MariaDB Galera Cluster 10.0.16

Release Notes Changelog What is MariaDB Galera Cluster?

MariaDB APT and YUM Repository Configuration Generator

The MariaDB project is pleased to announce the immediate availability of MariaDB Galera Cluster 10.0.16. This is a Stable (GA) release.

See the …

Hi there, it’s been a few months since Percona Live London has finished, but I managed just now to get sometime to post the slides from my presentation about backups. Please, take a look and feel free to comment.

Pdf Version

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Cloud security company Qualys announced Tuesday the issues prevalent in glibc since version 2.2 introduced in 2000-11-10 (the complete Qualys announcement may be viewed here). The vulnerability, CVE-2015-0235, has been dubbed “GHOST.”

As the announcement from Qualys indicates, it is believed that MySQL and by extension Percona Server are not affected by this issue.

Percona is in the process of conducting our own review into the issue related to the Percona Server source code – more information will be released as soon as it is available.

In the interim the current advisory is to update your glibc packages for your distributions if they are in fact vulnerable. The C code from the Qualys announcement may aid in your diagnostics, section 4 of …

Dear MySQL Friends,

Unfortunately, this year we won’t have the pleasure to attend Raghu’s show. Indeed, he couldn’t apply in time for his Visa.

I would like to thank Andrew Morgan to have accepted to present his talk “MySQL & NoSQL – best of both worlds” to replace “ENOMEM: Will databases ever stop asking for more memory” from Raghu.

Respecting the logic, the next talk should have been “Introduction to MySQL Binlog Events” from Neha Kumari, but once again it was too late for Visa appliance.
Logically, Andrew was the next one and he agrred to present his talk even if the notification was very short.

The final schedule is:

MySQL 5.6 allows you to execute replicated events in parallel as long as data is split across several databases. This feature is named “Multi-Threaded Slave” (MTS) and it is easy to enable by setting slave_parallel_workers to a > 1 value. However if you decide to use MTS without GTIDs, you may run into annoying issues. Let’s look at two of them.

Skipping replication errors

When replication stops with an error, a frequent approach is to “ignore now and fix later.” This means you will run SET GLOBAL sql_slave_skip_counter=1 to be able to restart replication as quickly as possible and later use pt-table-checksum/pt-table-sync to resync data on the slave.

Then the day when I hit:

mysql> show slave status;
[...]
Last_SQL_Error: Worker 0 failed executing transaction '' at master log mysql-bin.000017, end_log_pos 1216451; Error 'Duplicate entry '1001' for key 'PRIMARY'' on query. …