In the MySQL world, we’re used to playing in the MySQL Sandbox. It allows us to deploy a testing replication environment in seconds, without a great deal of effort or navigating multiple virtual machines. It is a tool that we couldn’t live without in Support.

In this post I am going to walk through the different ways we have to deploy a MongoDB replica/sharding set test in a similar way. It is important to mention that this is not intended for production, but to be used for troubleshooting, learning or just playing around with replication.

Replica Set regression test’s diagnostic commands

MongoDB includes a .js that allows us to deploy a replication set from the MongoDB’s shell. Just run the following:

# mongo --nodb …

MySQL 5.7 makes secure connections easier with streamlined key generation for both MySQL Community and MySQL Enterprise, improves security by expanding support for TLSv1.1 and TLSv1.2, and helps administrators assess whether clients are connecting securely or not with new visibility into connection types. …

What about an hackathon to fix several issues in Innotop during this Fosdem 2016 edition ?

As the MySQL & Friends Devroom is on Saturday, Sunday would be the perfect day to find a nice place in the bar and work on resolving the open issues in Innotop to support MariaDB 10.1, MySQL 5.7…

If you are interested just send me a tweet (@lefred) and we can arrange this meeting.

you have array with null value and you want to remove all null value from that array without loop you can remove your all null value from array without loop PHP arrayfilter function through you can remove all null value you see following example how to remove null value strongExamplestro

I recently worked a lot on getting my local Windows box to compile Windows.
I got a lot of help from the below link that took me a few steps towards the
solution.
http://www.chriscalender.com/resolving-the-bison-exe-m4-invalid-argument-error-when-building-mysqlmariadbxtradb-on-windows/

I had to save away my bison installation, uninstall it and then also
go into a registry editor and remove the various links to the Start Menu referring to
some help for Bison that had spaces in the registry. Resolving this meant that I could
manually run bison on the files in the mysql tarball and get the desired result. But it
was still not enough, I still had the same error when running a full automatic compile.

So then I found the …

While EXPLAIN shows the selected query plan for a query, optimizer trace will show you WHY the particular plan was selected. From the trace you will be able to see what alternative plans was considered, the estimated costs of different plans, and what decisions was made during query optimization.

To turn on recording of optimizer trace for the current session:

SET optimizer_trace='enabled=on';

When optimizer trace is enabled, the information schema table optimizer_trace will contain the trace for the latest query that was explained or executed. I usually dump the trace to a file using this SQL statement:

SELECT trace FROM information_schema.optimizer_trace 
    INTO OUTFILE '<filename>' LINES TERMINATED BY '';

One important thing to note is that there is a configurable maximum size for the memory buffer used to record the trace. The default is …

If you want to use Form or Html class and when you will see error like HTML class not found OR Form class not found dont worry about that because Laravel 5 change the package you should download the HTML and FORM class helper from given instruction aboveAdd given bellow text to your compose

Wed, 2016-01-27 09:11maria-luisaraviol

One of the key issues in 2016 for DBAs to tackle will be Database Security, mainly associated to the increasing adoption of public and private clouds, as well as mission critical applications running on open source databases in large Enterprises.

Database security is one of the key topics for all the major vendors in the MySQL and MariaDB ecosystem. Oracle has just released version 5.7 of MySQL, with more features for standard authentication and proxy users, long awaited by the Community. Enterprise customers can also benefit of a PAM authentication plugin that can support LDAP. Percona has improved its PAM plugin and it is very much focused on features that are related to security, naming audit.

The recent release of the 10.1 version of MariaDB has given it a significant boost in security features, available, as usual, to the whole Community.

The efforts of the MariaDB team …

Back in October I have write about possible ways of running multiple MySQL instances on the same hardware. As the months passing by, the project of splitting our database schemas into standalone instances is closing in, so I started to check the different ways.

EDIT: This post is outdated, here is the follow up.

I started with docker, because we’ll use containers anyway with the applications, and I think it is a good idea to minimise the diversity of an infrastructure. I used the docker’s “official” Percona image (it is official by Docker not by Percona!) which is easy to use, and flexible enough. (https://hub.docker.com/_/percona/) This image supports using custom config files, you can mount your …

A modern MySQL server contains a lot of useful meta-data in information_schema and performance_schema, which can help bring visibility into what is happening inside of your database server. However, sometimes this data is quite fine grained and needs finessing in order to get to that point

MySQL 5.7 includes a new SYS schema installed by default.…