I will be talking at Open Source India scheduled at NIMHANS convention center at Bangalore on 7th and 8th of Nov 2014.

Oracle has been associated with the Open Source India conference for the past 4 years and this will be the 5th year when we will be taking part in this conference and talking about MySQL to the open source community.

OSI gives us a great opportunity and a platform to speak to and hear from the open source community. There have been some great interactions with developers, users, customers of MySQL and some really great people involved with the open source movement in India.

We look forward to interact with the open source community again. While we will likely learn much this conference about the progress of the open source community in India, we will also be informing you about the fantastic progress Oracle has made with MySQL in the past year. …

Webm_v2 was add oracle and mongodb monitor module

webm was agent uploaded mode to save statistics

we use mysql database as monitor server

we already design tables to store these data (consider for future analysis)

you can download from github : https://github.com/ylouis83/webm

In my concluded testing post, I declared EXT4 my winner vs XFS for my scenario. My coworker, @keyurdg, was unwilling to let XFS lose out and made a few observations:

• XFS wasn’t *really* being formatted optimally for the RAID stripe size
• XFS wasn’t being mounted with the inode64 option which means that all of the inodes are kept in the first 2TB. (Side note: inode64 option is default in newer kernels but not on CentOS 6’s 2.6.32)
• Single threaded testing isn’t entirely accurate because …

A very old post of mine in 2009, MySQL’s stored procedure language could be so much more Useful suggested that it would be nice if MySQL could be adapted to use compound statements directly from the command line in a similar way to the language used for stored procedures. I’ve just seen that this seems to … Continue reading MariaDB 10.1 Brings Compound Statements

Recently came across the problem where mysql server stop running and refusing to start with an error

The server quit without updating PID file (/var/run/mysqld/mysqld.pid)

Checked Mysql error log and found that an invalid usage of charset with collation causing problem.

error log:
141017 12:20:41 mysqld_safe Starting mysqld daemon with databases from /usr/local/mysql/data
while 15088 [ERROR] COLLATION 'utf8_general_ci' is not valid for CHARACTER SET 'latin1'
15088 [ERROR] Aborting

In this case mysqld trying to start  with  character-set-server = latin1 and collation-server = utf8_general_ci, which is not valid.
The following is the right charset value for COLLATION ‘utf8_general_ci’

node1 [localhost] {msandbox} ((none)) > SHOW COLLATION LIKE ‘utf8_general_ci’;

…

In many write-intensive workloads Innodb/XtraDB storage engines you may see hidden and dangerous “debt” being accumulated – unpurged transaction “history” which if not kept in check over time will cause serve performance regression or will take all free space and cause an outage. Let’s talk about where it comes from and what can you do to avoid running into the trouble.

Technical Background: InnoDB is an MVCC engine which means it keeps multiple versions of the rows in the database, and when rows are deleted or updated they are not immediately removed from the database but kept for some time – until they can be removed. For a majority of OLTP workloads they can be removed seconds after the change actually took place. In some cases though they might need to be kept for a long period of time – if there are some old transactions running in the system that might still need to look at an old database state. As of …

October 17, 2014 By Severalnines

Integrating ClusterControl with a corporate LDAP directory is a common task for many IT organizations. In an earlier blog, we showed you how to integrate ClusterControl with OpenLDAP. In this post, we will show you how to integrate with FreeIPA and Windows Active Directory. 

How ClusterControl Performs LDAP Authentication

ClusterControl supports up to LDAPv3 protocol based on RFC2307. More details on this in the documentation.

When authenticating, ClusterControl will first bind to the directory tree server (LDAP …

Multi-source replication for MySQL has been released as a part of 5.7.5-labs-preview
downloadable from labs.mysql.com. It is one among the several features that are
cooking in the replication technologies at MySQL.  (For a birds eye view of all
replication features introduced in 5.7 and labs, look  at the blog posts here and here.

Previously, we have introduced a preliminary multi-source feature labs preview. Based on the feed back from that labs release, we …

I recently had a client ask me how to use Percona Toolkit tools with an SSL connection to MySQL (MySQL-SSL). SSL connections aren’t widely used in MySQL due to most installations being within an internal network. Still, there are cases where you could be accessing MySQL over public internet or even over a public “private” network (ex: WAN between two colo datacenters). In order to keep packet sniffers at bay, the connection to MySQL should be encrypted.

If you are connecting to Amazon RDS from home or office (ie: not within the AWS network) you better be encrypted!

As there is already a MySQL Performance Blog post on how to setup MySQL SSL connections, we can skip that and dive right in.

As you probably know, the mysql client …

In a few weeks I’m presenting “Performance Benchmarking: Tips, Tricks, and Lessons Learned” at Percona Live London 2014 (November 3-4). I continue to learn lessons and improve my benchmarking capabilities, so the content is a full upgrade from my presentation at Percona Live Santa Clara in April 2013. Anyone interested in achieving and sustaining the best performance out of their software/hardware/application should attend.

Also, Tokutek is sponsoring so we’ll be available in the expo hall throughout the show.

If you are attending or in the area and want to learn more about …