Every now and then there is a need to execute certain SQL statements conditionally. Easy, if you do it from your PHP (or Java or whatever) application. But if all you have is pure SQL? There are two techniques that MariaDB and MySQL use in the mysql_fix_privilege_tables.sql script (applied by mysql_upgrade tool).

1. Create a stored procedure with IF statements inside, call it once and drop it. This requires the user to have the CREATE ROUTINE privilege and mysql.proc table must exist and be usable (which is not necessarily true — we’re doing it from mysql_upgrade, right?).
2. Use dynamic SQL, like
   

   SET @str = IF (@have_csv = 'YES',
                  'CREATE TABLE IF NOT EXISTS general_log (
                     event_time TIMESTAMP(6) NOT NULL,
                     user_host MEDIUMTEXT NOT NULL,
                     thread_id BIGINT(21) UNSIGNED NOT NULL, …

I reckon there’s little sense in running 2 or more Percona XtraDB Cluster (PXC) nodes in a single physical server other than for educational and testing purposes – but doing so is still useful in those cases. The most popular way of achieving this seems to be with server virtualization, such as making use of Vagrant boxes. But in the same way you can have multiple instances of MySQL running in parallel on the OS level in the form of concurrent mysqld processes, so too can you have multiple Percona XtraDB Cluster nodes. And the way to achieve this is precisely the same: using dedicated datadirs and different ports for each node.

Which ports?4 tcp ports are used by Pecona …

In 5.7.5, as a part of the larger effort to improve error handling, we re-implemented the IGNORE clause (WL#6614). The IGNORE clause is a MySQL extension to the SQL standard. It affects the errors which occur for each row. The new implementation aims to make the behavior of the IGNORE clause more consistent.

Statements which support the IGNORE clause are:

• INSERT [ IGNORE ]
• UPDATE [ IGNORE ]
• DELETE [ IGNORE ]
• LOAD DATA [ IGNORE ]
• LOAD XML [ IGNORE ]
• CREATE TABLE… [ IGNORE ] SELECT

When the INSERT statement is used to insert a number of rows into a table, an exception during processing would normally abort the statement and return an error message. With the IGNORE keyword, rows that cause certain exceptions are ignored, but the remaining rows are inserted and the …

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 …

(Note : This an Article from last year when MySQL5.6 was released)

While Database technology is one of the oldest branches of computer science, it remains a fundamental computer technology that continues to attract new research. The current focus of Databases technology is towards adapting hot new tends like multi-core chips, solid state devices, NOSQL and Cloud. So what does a contemporary internet developer look for in a database for the internet era? And why does MySQL remain the most popular database for the web?

For a database to be useful while developing products for the Web, the most important requirements are that it should be quick and easy to download, quick to set up, powerful enough to get the job done, be fast and flexible to use and finally be scalable on the newest hardware. Compatibility with the latest technologies like the cloud also remains foremost in the minds of …

Since this is my first blog I feel it's necessary to introduce myself. I'm Tim Callaghan, I work at Tokutek (makers of TokuDB and TokuMX), and I love benchmarking. While some of the content on this blog will certainly be about Tokutek technologies, I plan on exploring a wide variety of others as well. These are strictly my own personal views and opinions, and comments/feedback are always welcome. Lets get started...

A few weeks ago I noticed an EnterpriseDB NoSQL Benchmark that measured Data Load, Insert, Select, and Size. It wasn't just a NoSQL benchmark, it was specifically calling out …

Mon, 2014-10-20 09:31maria-luisaraviol

I am back from 2014 Amsterdam Drupalcon where MariaDB Corporation was present as sponsor. It was my first time there and I must say I was really impressed by the amount of people attending the conference (around 2300 people) and the interest that the people showed for MariaDB.

We had many conversations with several kind of engineers, developers, providers and just for a few of them MariaDB was something new to discover; the great majority of them either were already using it or were planning to do it but they did not manage to find some “free” time to do it yet.

What impressed me, was that almost all of the MariaDB happy users just replaced their previous database server installation (MySQL or Percona) with MariaDB with the same approach they might have had for a standard database server upgrade: switch off, backup, …

Mon, 2014-10-20 09:31maria-luisaraviol

I am back from 2014 Amsterdam Drupalcon where MariaDB Corporation was present as sponsor. It was my first time there and I must say I was really impressed by the amount of people attending the conference (around 2300 people) and the interest that the people showed for MariaDB.

We had many conversations with several kind of engineers, developers, providers and just for a few of them MariaDB was something new to discover; the great majority of them either were already using it or were planning to do it but they did not manage to find some “free” time to do it yet.

What impressed me, was that almost all of the MariaDB happy users just replaced their previous database server installation (MySQL or Percona) with MariaDB with the same approach they might have had for a standard database server upgrade: switch off, backup, …