In a world where new data processing languages appear every day, it can be helpful to have tutorials explaining language characteristics in detail from the ground up.  This blog post is not such a tutorial.   It also isn’t a tutorial on getting started with MySQL or Hadoop, nor is it a list of best practices for the various languages I’ll reference here – there are bound to be better ways to accomplish certain tasks, and where a choice was required, I’ve emphasized clarity and readability over performance.  Finally, this isn’t meant to be a quickstart for SQL experts to access Hadoop – there are a number of SQL interfaces to Hadoop such as Impala or Hive that make Hadoop incredibly accessible to those with existing SQL skills.

Instead, this post is a pale equivalent of the …

This blog post is an update to our last post discussing database compression methods, and how they stack up against each other. 

When Vadim and I wrote about Evaluating Database Compression Methods last month, we claimed that evaluating database compression algorithms was easy these days because there are ready-to-use benchmark suites such as lzbench.

As easy as it was to do an evaluation with this tool, it turned out it was also easy to make a mistake. Due to a bug in the benchmark we got incorrect results for the LZ4 …

This Log Buffer Edition digs deep into the realms of Oracle, SQL Server and MySQL and brings together a few of the top blog posts.

Oracle

We’ve all encountered a situation when you want to check a simple query or syntax for your SQL and don’t have a database around. Of course, most of us have at least a virtual machine for that, but it takes time to fire it up, and if you work from battery, it can leave you without power pretty quickly.

View Criteria is set to execute in Database mode by default. There is option to change execution mode to Both. This would execute query and fetch results from database and from memory.  Such query execution is useful, when we want to include newly created (but not …

Starting with MySQL 5.7 we introduced the Query Rewrite Plugin. That tool is really useful for changing queries. Of course the best location to modify the query is the source code of the application, but this is not always possible. Either the application is not under your control or queries are generated from a framework like Hibernate and sometimes it is hard to change the query generation.
If you are interested in details about the Query Rewrite Plugin, I recommend this blogpost from the MySQL Engineering: http://mysqlserverteam.com/the-query-rewrite-plugins/
Recently I was asked how this works in replication environments. Which query goes into the binlog?

If you are using the Rewriter plugin that comes with MySQL 5.7, the answer is easy: This plugin only supports rewriting SELECT queries. SELECT queries don't get into the binlog …

Interesting developments in the MySQL world – it can now be used as a document store and you can query the database using JavaScript instead of SQL (via the MySQL Shell). There is also a new X Plugin (see: mysql-5.7.12/rapid/) (which now makes use of protocol buffers (see: mysql-5.7.12/extra/protobuf/)). I will agree, this is more than just a maintenance release.

Do get started playing with MySQL Shell. If you’re using the yum repository, remember to ensure you have …

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Today i will let you know example of laravel check if record exists in database We will look at example of laravel check if record not exists This post will give you simple example of laravel check if record exists in table lets discuss about laravel check if record exists in database So let

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If you have been following our multi-part blog-post series around MySQL 5.7.12 so far you have heard on term a lot: “X”. So what does X stand for? A very good question, let’s see if Part 3 of the blog-post series on the MySQL Document Store will help you finding more about that.…

I recently tried my hands at TDD to develop a basic ToDo app using QUnit as the testing framework.

Here is the link to the application demo.
I have written both unit and integration / functional tests while developing this app. The source code can be checked here.
To run and see the results of tests, refer below links:

Unit test results
Integration / Functional test …