When you need to work with a database that you are not 100% familiar with, you can be overwhelmed by the hundreds of metrics available. Which ones are the most important? What should I monitor, and why? What patterns in metrics should ring some alarm bells? In this blog post we will try to introduce you to some of the most important metrics to keep an eye on while running MySQL or MariaDB in production.

Com_* status counters

We will start with Com_* counters - those define the number and types of queries that MySQL executes. We are talking here about query types like SELECT, INSERT, UPDATE and many more. It is quite important to keep an eye on those as sudden spikes or unexpected drops may suggest something went wrong in the system.

Our all-inclusive database management system ClusterControl shows you this data related to the most common query types in the “Overview” section.

Handler_* status counters

Percona announces the GA release of Percona XtraBackup 2.4.8 on July 24, 2017. You can download it from our download site and apt and yum repositories.

Percona XtraBackup enables MySQL backups without blocking user queries, making it ideal for companies with large data sets and mission-critical applications that cannot tolerate long periods of downtime. Offered free as an open source solution, Percona …

Dear MySQL Users,

A new GA (general availability) version of MySQL Connector/C has been
made available: MySQL Connector/C 6.1.11 GA. The MySQL Connector/C 6.1
implements the MySQL C API for connecting client applications to the
MySQL Server 5.5 or newer.

You can download the production release at:
http://dev.mysql.com/downloads/connector/c/6.1.html

MySQL Connector C (Commercial) will be available for download on the My
Oracle Support (MOS) website. This release will be available on
eDelivery (OSDC) in next month’s upload cycle.

Please see the documentation and the README file in the source distribution
for a detailed description of bugs that have been fixed.

Enjoy!

=======================================================================

Changes in MySQL Connector/C 6.1.11 (2017-07-24)

Security Notes

* The linked …

MySQL Connector/ODBC 5.3.9, a new version of the ODBC driver for
the MySQL database management system, has been released.

The available downloads include both a Unicode driver and an ANSI
driver based on the same modern codebase. Please select the driver type
you need based on the type of your application – Unicode or ANSI.
Server-side prepared statements are enabled by default. It is suitable
for use with any MySQL version from 5.5.

This is the fourth release of the MySQL ODBC driver conforming to the
ODBC 3.8 specification. It contains implementations of key 3.8 features,
including self-identification as a ODBC 3.8 driver, streaming of output
parameters (supported for binary types only), and support of the
SQL_ATTR_RESET_CONNECTION connection attribute (for the Unicode driver
only).

Also, Connector/ODBC 5.3 introduces a GTK+-based setup …

Pimcore is an open source enterprise content management system (CMS) written in PHP, It uses MySQL as database backend. In this tutorial, we will install Pimcore CMS on CentOS 7 server.

MySQL theoretical limits are known and they can be found in the manual, they include:

MyISAM permits data and index files to grow up to 256 TiB by default, but this limit can be changed up to the maximum permissible size of 65,536 TiB (256^7 − 1 bytes). The maximum tablespace size depends on the InnoDB page size: 64 TiB for 16 KiB pages.(The maximum tablespace size is also the maximum size for a

Last time I had to use gdb to check what's going on in MySQL server and found something useful with it to share in the blog post it was April 2017, and I miss this kind of experience already. So, today I decided to try it again in a hope to get some insights in cases when other tools may not apply or may not be as helpful as one could expect. Here is the long enough story, based on recent customer issue I worked on this week.
* * * Had you seen anything like this output of SHOW PROCESSLIST statement:

Id User Host db Command Time State 
Info Progress
...
28 someuser01 xx.xx.xx.xx:39644 somedb001 Sleep 247  
NULL 0.000
29 someuser01 xx.xx.xx.yy:44100 somedb001 Query 276 
Waiting for table level lock DELETE FROM t1 WHERE (some_id = 'NNNNN') AND ... 0.000 …

Dear MySQL Users,

MySQL Connector/J 5.1.43, a maintenance release of the production 5.1 branch has been released. Connector/J is the Type-IV pure-Java JDBC driver for MySQL.

MySQL Connector Java is available in source and binary form from the Connector/J download pages at http://dev.mysql.com/downloads/connector/j/5.1.html and mirror sit
repositories.

MySQL Connector Java (Commercial) is already available for download on the My Oracle Support (MOS) website. This release will be available on eDelivery
(OSDC) in next month’s upload cycle.

As always, we recommend that you check the “CHANGES” file in the download archive to be aware of changes in behavior that might affect your application.

MySQL Connector/J 5.1.43 includes the following general bug fixes and improvements, also available in more detail on http://dev.mysql.com/doc/relnotes/connector-j/en
nges in MySQL Connector/J …

This Log Buffer Edition covers Oracle, SQL Server and MySQL.

Oracle:

Protecting Financial Data with Oracle WebCenter and Adobe LiveCycle

Oracle Forms 12c oracle.security.jps.JpsException Error after Database change

The Future of Content Management: Oracle Content & Experience Cloud

Today Oracle released a very large „monster“ Upgrade. This July 2017 Update includes the first time the new RU „Release …

In this blog, we’ll look at how improvements to Percona XtraDB Cluster improved IST performance.

Introduction

Starting in version 5.7.17-29.20 of Percona XtraDB Cluster significantly improved performance. Depending on the workload, the increase in throughput is in the range of 3-10x. (More details here). These optimization fixes also helped improve IST (Incremental State Transfer) performance. This blog is aimed at studying the IST impact.

IST

IST stands for incremental state transfer. When a node of the cluster leaves the cluster for a short period of time and then rejoins the cluster it needs to catch-up with cluster state. As part of this sync …