How to Retrieve ORACLE Usage Statistics

As promised before, I'm going to tell you how to retrieve ORACLE usage statistics. Just as MySQL, ORACLE also stores its statistics in some internal databases.Here is an SQL script to retrieve its disk usage statistics.

NOTE: Make sure you replace ":owner" with admin username.

Reference: http://stackoverflow.com/questions/264914/how-do-i-calculate-tables-size-in-oracle

Next post will be on how to retrieve statistics data in Apache Cassandra.

How to Retrieve MySQL Usage Statistics

In enterprise applications, monitoring usage statistics of database servers it uses is useful in many ways. It can be a situation where you need to meter and bill usage of system, or just to keep track of how data grows and system works. 

I'm trying to make you aware of different ways of statistic retrieval methods of some popular DBMS systems. As the first step, in this post I'm going to talk about how to retrieve MySQL usage statistics.

MySQL itself stores statistics data and metadata in some of its internal databases, namely mysql, information_schema and performance_schema. We can access those databases to get what we need. MySQL also gives some special queries for that.

Let's start with a simple one. This is how you can retrieve current session statistics.

And this is how you can see global statistics.

This is one way you can retrieve disk usage statistics for each database.