MySQL Enterprise Firewall is a commercial extension, and is included with MySQL Enterprise Edition. This new SQL based firewall was just released in the MySQL 5.6.24 Enterprise Server! Let me tell you a bit more about how it reduces security vulnerabilities, how it works, and how to use it.

All too often, as statistics and daily headlines show, badly written applications continue to expose an organizations sensitive data to malicious attackers. These …

Every day hundreds of millions of dollars are wasted by allowing improperly tuned or misconfigured systems, misunderstood infrastructure, and inefficient IT operations to live and thrive in data centers around the globe. There are both direct and indirect costs associated with allowing these unhealthy systems to continue to exist. Let’s look at some.

The setup:

Let us start by using a small example. We will start by looking at a small database setup. This setup will have a single master-slave, with a database size of lets say 500GB. Traffic is steady and let’s say this translates into 500 IOPS on the master. You have chosen to host this on Amazon’s AWS. A common way of ensuring backups occur in AWS is to setup ebs snapshots of the slave. In terms of usage, let us assume your CPU is about 50% used and you have about 20GB of hot data that needs to stay in the memory for the database.

If we look at what this …

Below video will depict :

* How to set a login path

* How to use login path in mysql client

* How to use login path in mysqldump

* How to remove login path

You can download the slides from below URL

config_editor

Having big tables is one of the expected database problems, especially, for the fast growing database systems. In fact, big tables itself is not a problem but with big tables, the following problems are strongly expected:

1. Retrieving data from big tables is so slow.
2. It is a very hard job to maintain those tables like adding/removing an index, adding/dropping/modifying a column, … etc.
3. System resources, especially, the IO system might not be able to handle such huge traffic of writes and reads.
4. When it comes to the reporting queries, it might be a horrible nightmare!
5. Always cause disk space problem.

All the above problems will show up the need for scaling! So, let’s check out what are the possible solutions for that problem:

• MySQL Partitioning: Is a good solution but we will still face disk space and server resources problems. …

On a recent engagement I worked with a customer who makes extensive use of UUID() values for their Primary Key and stores it as char(36), and their row count on this example table has grown to over 1 billion rows.

The table is INSERT-only (no UPDATEs or DELETEs), and the bulk of their retrieval are PK lookups. Lookups by PK were performing acceptably, but they were concerned with the space usage by the table as we were approaching 1TB (running with innodb_file_per_table=1 and Percona Server 5.5).

This schema model presents an increasing burden for backups since they use Percona XtraBackup, and so the question was asked: does their choice of an effectively random Primary Key based on UUID() impact their on-disk storage, and to what extent? And as a neat trick I show towards the end of this post how you can calculate the …

The Ubuntu 12.04.3 LTS release only provides MySQL 5.1 and MySQL 5.5 using the default Ubuntu package manager.

Oracle (owners of the MySQL(tm)) now provide Debian/Ubuntu APT repositories for all GA and DMR versions of MySQL including supporting Ubuntu 12.04.

The following steps demonstrate upgrading from the Ubuntu 5.5 server package to the Oracle 5.6 server package.

Verify MySQL Packages

$ apt-cache search mysql-server
mysql-server - MySQL database server (metapackage depending on the latest version)
mysql-server-5.5 - MySQL database server binaries and system database setup
mysql-server-core-5.5 - MySQL database server binaries
auth2db - Powerful and eye-candy IDS logger, log viewer and alert generator
cacti - Frontend to rrdtool for monitoring systems and services
torrentflux - web based, feature-rich BitTorrent download manager

Verify …

As part of a MySQL 5.5 to MySQL 5.6 upgrade across several Ubuntu servers of varying distros an audit highlighted a trivial but interesting versioning identification error in Ubuntu’s packaging of MySQL.

Ubuntu 12.04 LTS

$ sudo dpkg -l | grep mysql-server-5.5
ii  mysql-server-5.5   5.5.41-0ubuntu0.12.04.1  ...

$ mysql -uroot -p -e "SELECT VERSION()"
+-------------------------+
| VERSION()               |
+-------------------------+
| 5.5.41-0ubuntu0.12.04.1 |
+-------------------------+

But when you look at the mysql --version it does NOT say 5.5.41.

$ mysql --version
mysql  Ver 14.14 Distrib 5.5.34, for debian-linux-gnu (x86_64) using readline 6.2

Ubuntu 14.04 LTS

On 14.04 I get expected results.

$ sudo dpkg -l | grep mysql-server-5.5
ii  mysql-server-5.5       5.5.41-0ubuntu0.14.04.1   ...

rbradfor@rubble:~$ mysql -uroot -p -e "SELECT VERSION()" …

MySQL 5.6 will now automatically recreate the InnoDB redo log files during a MySQL restart if the size (or number) of these logs changes, i.e. a change to innodb_log_file_size. See Changing the Number or Size of InnoDB Log Files which states “If InnoDB detects that the innodb_log_file_size differs from the redo log file size, it will write a log checkpoint, close and remove the old log files, create new log files at the requested size, and open the new log files.”

Before MySQL 5.6 it was necessary to stop MySQL and remove the InnoDB log files manually before restarting MySQL.

The error log shows:

tail -f /mysql/log/error.log
...
2015-03-28 21:51:25 3767 [Warning] InnoDB: Resizing redo log from 2*3072 to 2*65536 pages, LSN=1626017
2015-03-28 21:51:25 3767 [Warning] InnoDB: Starting to delete and …

Mermaids have the same probability of fixing your permission problems, but people continue believing in the FLUSH PRIVILEGES myth.I see suggesting the usage of FLUSH PRIVILEGES every time someone writes a tutorial or a solution to a problem regarding creating a new account or providing different privileges. For example, the top post on /r/mysql as of the writing of these lines, “MySQL:The user specified as a definer does not exist (error 1449)-Solutions” has multiple guilty cases of this (Update: the user has corrected those lines after I posted this article).

It is not my intention to bash that post, but I have seen …

Check Out Our Latest Technical Resources for MySQL, MariaDB, Postgres and MongoDB.

This blog is packed with all the latest resources and tools we’ve recently published! Please do check it out and let us know if you have any comments or feedback.

New Technical Live Webinar

• What: Deep-dive into How to Monitor Galera Cluster
• When: Tuesday April 21st
• Who: Krzysztof Książek, Senior Support Engineer, Severalnines
• Where: Register Here

Join our colleague Krzysztof Książek for a deep-dive session what to monitor in Galera Cluster for MySQL & MariaDB. Krzysztof is a MySQL DBA with experience managing complex database environments for companies like Zendesk, …