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Showing entries 1 to 10 of 34434 10 Older Entries
Fedora 22 is out, and we’re ready
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Fedora 22 arrived yesterday. With a cutting edge GCC (5.1), the new DNF package management system, and improved tooling for server administration, we congratulate the Fedora community on yet another innovative release. We’re following up from our side, and as of yesterday our repos offer Fedora 22 packages of these products: MySQL Server 5.6 (currently […]

MySQL 5.7 key features
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The other day I was discussing new features of MySQL 5.7 with a Percona Support customer. After that conversation, I thought it would be a good idea to compile list of important features of MySQL 5.7. The latest MySQL 5.7.6 release candidate (RC) is out and is packed with nice features. Here’s a list of some MySQL 5.7 key features.

Replication Enhancements:

  • One of the top features in MySQL 5.7 is multi-source replication. With multi-source replication you can point multiple master server’s to slave so limitation of slave having only one master is …
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MariaDB 10.0.19 Overview and Highlights
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MariaDB 10.0.19 was recently released, and is available for download here:

This is the tenth GA release of MariaDB 10.0, and 20th overall release of MariaDB 10.0.

This was a quick release in order to get a fix for a mysql_upgrade bug (MDEV-8115) introduced in 10.0.18, so there is that, and only 9 other bug fixes.

Here are the main items of note:

  • Fixed the server crash caused by mysql_upgrade ( …
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MariaDB 10.0.18 Overview and Highlights
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MariaDB 10.0.18 was recently released, and is available for download here:

This is the ninth GA release of MariaDB 10.0, and 19th overall release of MariaDB 10.0.

There were no major functionality changes, but there were some general improvements, several security fixes, plus a 10.0.18 mysql_upgrade caution, and quite a few bug fixes, so let me cover what I feel are the main items of note:

  • Security Fixes: Fixes for the following …
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MariaDB 5.5.43 Overview and Highlights
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MariaDB 5.5.43 was recently released (it is the latest MariaDB 5.5), and is available for download here:

This is a maintenance release, and so there were not too many major changes, but definitely a few worth mentioning, as well as one *important* caution:

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MySQL Query Profiling with Performance Schema
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One of my favorite tools for query optimization is profiling. But recently I noticed this warning:

mysql> set profiling=1;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> show warnings;
| Level   | Code | Message                                                              |
| Warning | 1287 | '@@profiling' is deprecated and will be removed in a future release. |

After looking through …

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Making Existing SQLPLUS Scripts 12c and Container DB (PDB) Compatible
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Oracle 12c introduces new catalog features including CDB_ dictionary views (which include a CON_ID column) superseding the DBA_ views that most DBA sqlplus scripts are based upon.

However, existing DBA sqlplus scripts can easily be modified using just a few simple sqlplus techniques to be compatible with 11g, as well as all types of 12c databases including legacy and container databases.

The following simple SQL and sqlplus techniques can be used to make a “universal script” that is compatible with all versions.

Illustrating the Issue

Let’s say for sake of example that we have a simple 10g/11g monitoring script that’s …

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Log Buffer #424: A Carnival of the Vanities for DBAs
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This Log Buffer Edition covers various valuable blog posts from the fields of Oracle, SQL Server and MySQL.


  • Oracle Big Data Appliance X5-2 with Big Data SQL for the DBA.
  • Loading, Updating and Deleting From HBase Tables using HiveQL and Python.
  • In keeping with the ODA quarterly …
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MySQL Optimizer Tracer usage case with count(*)
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What is Optimizer Trace?
After reading topic about Optimizer Tracer by Morgan Tocker decided to test it.
From Optimizer Trace and EXPLAIN FORMAT=JSON in 5.7:
Optimizer trace is a new diagnostic tool introduced in MySQL 5.6 to show how the optimizer is working internally. It is similar to EXPLAIN, with a few notable differences:

It doesn’t just show the intended execution plan, it shows the alternative choices.
You enable the optimizer trace, then you …

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What’s the latest with Hadoop
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The Big Data explosion in recent years has created a vast number of new technologies in the area of data processing, storage, and management. One of the biggest names to appear on the scene is Hadoop. In case you need a quick review, Hadoop is a Big Data storage system that takes in large amounts of data from servers and breaks it into smaller, manageable chunks. The technology is complex but at a high level the Hadoop ecosystem essentially takes a “divide and conquer” approach to processing Big Data instead of processing data in tables, as in a relational database like …

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Showing entries 1 to 10 of 34434 10 Older Entries

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