MySQL Fabric is a great tool for managing a farm of MySQL servers. In the last two posts you can see how High Availability Fail over and Sharding work. When things are working right, the group lookup_servers will look something like this:
server_uuid address status mode weight
------------------------------------ ----------- --------- ---------- ------
09d13be1-cdd0-11e4-8643-0800273b9c80 10.10.13.10 SECONDARY READ_ONLY 1.0
0f611996-cdd0-11e4-8643-0800273b9c80 10.10.13.20 SECONDARY READ_ONLY 1.0
11aae7e7-cdd0-11e4-8643-0800273b9c80 10.10.13.30 PRIMARY READ_WRITE 1.0

This is a three node farm with a PRIMARY for READ-WRITE operations and two …

This Log Buffer edition has collected some of the valuable blog posts from different databases like Oracle, SQL Server and MySQL.

Oracle:

• Accessing HDFS files on a local File system using mountable HDFS – FUSE
• enq: TM – contention
• The Four A’s of Data Management
• ODI, Big Data SQL and Oracle NoSQL
• Using the RIDC Client to Interface with Oracle …

A few years back Deva wrote about how to use tcpdump on very busy hosts. That post sparked my interest about exploring how to measure the impact of tcpdump on very busy hosts. In this post, I wanted to highlight how much of an impact there really is and what options you have to make the query collection much more effective.

Some things you need to know:

• The test is a sysbench read-only workload, 8 tables, 8 threads, 1000000 rows each with 16G of buffer pool. Dataset fully in memory.
• sysbench is ran on the same host, on 1Gbps connection, sysbench can saturate the network and therefore affect my network test with netcat so I decided to run locally.
• There are 13 tests, 5 minutes each with 1 minute interval, varying on how the dump file is captured.
  • First one as …

This Log Buffer travels wide and deep to scour through the Internet to bring some of the most valuable and value-adding blog posts from Oracle, SQL Server and MySQL.

Oracle:

What is SQLcl ? SQLcl is a new command line interface like SQL*PLUS coming along with SQL Developper 4.1 Early Adopter. It’s a lightweight tool (only 11MB) developed by the SQL Developer team, which is fully compatible with Windows and Unix/Linux.  Also, you don’t need to install it so it’s totally portable.

Find Users with DBA Roles.

Virtual Compute Appliance 2.0.2 Released.

In case you are not …

1) To find slow queries

pt-query-digest /var/lib/mysql/cloud-server-01-slow.log > slowqueroutput.log

2) Between a particular time range

pt-query-digest –since ’2015-04-10 00:00:00′ –until ’2015-04-10 23:59:59′ /var/lib/mysql/cloud-server-01-slow.log > slowqueryrange.log

3) For a particular database

pt-query-digest –filter ‘$event->{db} && $event->{db} =~ /employee/’ /var/lib/mysql/cloud-server-01-slow.log > slowqueroutputemp.log

pt-query-digest –filter ‘$event->{db} && $event->{db} =~ /market/’ /var/lib/mysql/cloud-server-01-slow.log > slowqueroutputmkt.log

4) For a particular user

pt-query-digest –filter ‘$event->{user} && $event->{user} =~ /root/’ /var/lib/mysql/cloud-server-01-slow.log > slowqueryoutputuser.log …

Recently i encounter an uprising among PHP Developers that , they must write a script additionally checking the strength of MySQL user password at creation time.
So, just for note that there is ready to use plugin in MySQL named: validate_password.so

The file location is default in plugin_dir in Linux:

mysql> select @@plugin_dir;
+--------------------------+
| @@plugin_dir             |
+--------------------------+
| /usr/lib64/mysql/plugin/ |
+--------------------------+
1 row in set (0,00 sec)

List this directory:

[root@linuxsrv3 plugin]# ls
adt_null.so     auth_test_plugin.so  innodb_engine.so      mypluglib.so          qa_auth_server.so   validate_password.so
auth.so         daemon_example.ini   libdaemon_example.so  qa_auth_client.so     semisync_master.so
auth_socket.so  debug                libmemcached.so       qa_auth_interface.so  semisync_slave.so

As you see there is a …

On Tuesday  Steaphan Greene  announced that all currently-pushed changes have now been rebased onto the newly-released upstream MySQL-5.6.24.

The new branch at this point is available on github.

Our .deb and .rpm builds are available in the PSCE repo as well as being browsable here http://repo.psce.com/download/webscalesql/

Instructions for using the repo are available for Debian …

Galera Cluster For System Administrators, DBAs And DevOps

Galera Cluster for MySQL, MariaDB and Percona XtraDB involves more effort and resource to administer than standalone systems. If you would like to learn how to best deploy, monitor, manage and scale your database cluster(s), then this new online training course is for you!

The course is designed for system administrators & database administrators looking to gain more in depth expertise in the automation and management of Galera Clusters.

What: A one-day, instructor-led, Galera Cluster management training course

When: The …

Complimenting the expanded CREATE USER syntax introduced in MySQL Server 5.7.6 is more useful ALTER USER syntax.  Before MySQL Server 5.7.6, ALTER USER could only be used to expire a user’s password.  That’s pretty limited.  With changes made in MySQL Server 5.7.6, a better distinction is made between privilege-level attributes (those which are managed via GRANT and REVOKE statements) and account-level attributes (those managed using CREATE USER and ALTER USER statements).  MySQL has a long history of confusing these – for example, requiring a GRANT …

I use a Fedora 20 VM image to teach Oracle and MySQL technology. Last week, I expanded the Fedora VM image to support a full LAMP stack. This blog shows you how to install Ruby on Fedora and successfully generate the Rails gems.

Connect as the root user and use yum to install the libraries. My approach is by library or small groups. Naturally, you start with the ruby library.

yum install ruby

You will see the following:

Loaded plugins: langpacks, refresh-packagekit
mysql-connectors-community                                  | 2.5 kB  00:00     
mysql-tools-community                                       | 2.5 kB  00:00     
mysql56-community                                           | 2.5 kB  00:00     
pgdg93                                                      | 3.6 kB  00:00     
updates/20/x86_64/metalink …