Using window functions is yet another way to implement pagination in SQL. They offer a flexible and above all, standards-compliant option. But only SQL Server and the Oracle database allow to use them for a pipelined Top-N query. PostgreSQL does not use indexes for those queries and is therefore executing them very inefficiently. MySQL does not support window functions at all.

Explains all the steps you need to setup MongoDB - run MapReduce from the shell and via a Java client.

This blogger suggests that Amazon's Elastic Block Store was developed for Amazon's internal needs because it was released at the same time as EC2.

It seems like some NoSQL vendors have been moving back towards SQL-like interfaces, which is just what this writer has a problem with. He discusses the problems that arise when these worlds collide, and calls for "a real language for unstructured data," rather than resorting to those like XQuery. There is an interesting list of suggestions for what such a language should include.

Large part of the challenges we face are not direct problem solving, but rather configuration and setup of infrastructure. Try out the new open source IOG library for a new way of looking at objects and data.

Today I was faced with a situation where in I need to rename a field in all the MongoDB documents. The best way to do this is using $rename operator shown below.

Hi guys! I’m going to show you how to do a CRUD (create, read, update, delete records) with PHP and MySQL using PHP Data Objects (PDO) extension. PDO is a more updated extension and it is actively developed by the PHP community. There are lots of reasons why you should use PDO in you projects. It helps you protect from SQL injection, lots of database support including IBM DB2 and Oracle, ect.

The problem with Amazon SQS, according to this author, is that users are limited in the messages they can fit onto the SQS queue (limited to 8k). The switch to MongoDB allows for 4MB chunks of schema-less data. The changeover is described with all the necessary code.

Oracle Advanced Analytics consists of Oracle R Enterprise, along with the vendor's existing Data Mining module. It's available as an Oracle 11g database option and costs US$23,000 per processor license.

Richard Kreuter and Kyle Banker on how to avoid classical RDBMS transactional systems by using compensation mechanisms, transactional messaging or transactional procedures.

John Hugg discusses high volume transaction processing applications with high and low frequency profiles, and how VoltDB can be used for that purpose.

Google's Cloud SQL offering for the Google AppEngine would simplify the process of moving existing applications to the Google AppEngine and gives developers the choice to freely move to their preferred web hosting provider.