Percona is glad to announce the first GA release of Percona XtraBackup 2.4.1 on February 23rd 2016. Downloads are available from our download site and from 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 …

In a few different places I saw comments about my last blog post about references and performance where commentators noted that my example was pointless. Which of course is true and to some degree the point.

I read a lot of PHP code and from time to time I see people with a non-PHP background (or otherwise influenced) putting references everywhere they pass arrays or such in order to prevent copies. I knew this was a bad practice in PHP 5 and wanted to verify this in PHP 7. For readers with a stronger PHP background this doesn't come to mind and so comments are like "what if I want to modify the data?" which might lead to something like this:

function modify(&$data) {
    $data["foo"] = "bar";
}
$data = [ /* huuuuuge array */ ];
modify($data);

In this code, from a performance perspective, the reference likely …

Sometimes you have a many tag with same class and attribute with value but you need to find maximal value of attribute from that comman class In bellow you have same html tagpre classcode languagehtmlltulgtltli classtest dataid3gthiltligtltli classtest datai

At a recent optimizer webinar, I talked about MySQL introducing a new style for hints, and that MySQL 5.7 also added support for more hints, see Sergey Glukhov’s blog. A question I got at the end of the webinar was what to do with the hints in the application code after an upgrade?…

For the past few years I’ve been writing and speaking about time-series storage, a problem inspired by what I help build at VividCortex and also my personal projects. I’ve been thinking about a related problem for much longer, but I haven’t had to work on it until now: ranking.

At VividCortex, we have a new tool called the Profiler. It allows you to rank within various categories of metrics, like MySQL or OS metrics, by a dimension, like count. You can rank top processes by total CPU time or memory, MySQL queries by execution time, and so on. We can do this for arbitrary time ranges.

The ranking is performed on the sums of values within each time range. If we’re ranking by CPU usage during a 300 second window, we look at the CPU usage measurements for each process at every second, sum those values up, …

Time for another entry in the EXPLAIN FORMAT=JSON is cool! series of blog posts. This time we’ll discuss how using EXPLAIN FORMAT=JSON allows you to see that

cost_info

  knows why the optimizer prefers one index to another.

Tables often have more than one index. Any of these indexes can be used to resolve query. The optimizer has to make a choice in this case. One of the metrics that can be used to help make the choice is the potential cost of the query evaluation.

For example, let’s take the table

titles

  from the standard employees database:

Sometimes you face problem you cant get post data using thisinputpost when you fire httppost using AngularJS or Jquery I also face this issue i cant receive post value when i fire httppost in AngularJS But i found how to receive post data or json data in Codeigniter controller i

Are you building an IOT solution and want to know how to store and retrieve your IOT data? Perhaps you're new to database systems and want to learn how to use them while you explore the exciting world of IOT.

This book is the answer for both scenarios; whether you're new to IOT and want to know how to leverage MySQL in your solution or you've wanted to learn more about MySQL, this book will provide many of the answers you seek.

The book also covers how to design your IOT solution around your data. Not only will you learn more about MySQL, but you will also see how best to deploy MySQL in your IOT solution using low-cost computer boards such as the Raspberry Pi, Beaglebone Black, Intel Galileo, and more.

Finally, the book will give you a thorough overview of how data can be augmented and annotated to make it easier to glean the golden nuggets of knowledge you seek while wading through your sensor data. …

Hi Akileish,
If you replicate from Oracle to Oracle ,as example, and enable DDL replication, it will create the same logical structure on the target . Essentially the GoldenGate will replay the command to create the index applying the mapping. Of course the internal index structure like number of levels and leaf blocks may be different. Speaking about other database engines it will depend from supported operations for the replication. As example if you replicate from Oracle to MySQL all DDL it is not going to work since DDL replication is not supported for that configuration.

—
Gleb

In our previous post, we described how MySQL Master-HA (MHA) performs a so called slave promotion (also known as master failover) and ensures all remaining slaves in the topology get attached under the new master and become equal in data set.

Another failover solution is the MariaDB MaxScale proxy in combination with the MariaDB Replication Manager. Let’s look at how these two separate products can work together and perform a failover. We will also describe how you can use them.

MaxScale + MariaDB Replication Manager MaxScale

For those unfamiliar with MaxScale: MaxScale is a versatile database proxy written in C that supports not only intelligent query routing but can also function as both a binlog server and intermediate master. MaxScale consists of five plugins: Authentication, Protocol, Monitor, Routing, …