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Most of you are already familiar with SQL database, and have a good knowledge on either MySQL, Oracle, or other SQL databases. In the last several years, NoSQL database is getting widely adopted to solve various business problems. It is helpful to understand the difference between SQL and NoSQL database, and some of available NoSQL [...]


How Much Swap Space to Add for Oracle Database on Linux

If you are running Oracle database on your environment, and having some performance issues because of memory, you may have to look at the swap space configured on your system. For Oracle 11g database, the following is the recommendation from Oracle in terms of how much space space you should add. If your RAM size [...]


How to Backup Oracle Database using RMAN (with Examples)

Even if you are not an Oracle DBA, you’ll still encounter a situation where you may have to take a backup of an Oracle database. Using Oracle RMAN, you can take a hot backup for your database, which will take a consistent backup even when your DB is up and running. This tutorial gives you [...]


If you are using Oracle database, at some point you might have to deal with uploading data to the tables from a text file. This article provides 10 practical examples on how to upload data from a flat file to Oracle tables. Input data file for SQL*Loader This is the input text file that contains [...]


How to Install Oracle VM VirtualBox and Create a Virtual Machine

Oracle VM VirtualBox is an open source virtualization software that you can install on various x86 systems. You can install Oracle VM Virtualbox on top of Windows, Linux, Mac, or Solaris. Once you install the virtualbox, you can create virtual machines that can be used to run guest operating systems like Windows, Linux, Solaris, etc. [...]


Question: I have purchased Linux support for RHEL and OEL from Oracle corporation. How do I register my Linux system to Oracle support network to download and update packages? Can you explain me with step-by-step instruction? Answer: After purchasing Linux support from Oracle, you should register your Linux system with Oracle’s Unbreakable Linux Network using [...]

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Unix Shell Script to Execute Oracle SQL Query

Question: Can you provide me a shell script that will accept oracle credentials, sql query to be executed and displays the output? Answer: The shell script given below prompts some basic information and displays the output of the SQL. You can use the same concept and hard-code some of these values in the shell-script itself [...]


Starting up and shutting down the oracle listener is a routine task for a database administrator. However a Linux system administrator or programmer may end-up doing some basic DBA operations on development database. It is critical for non-DBAs to understand the basic database admin activities. In this article, let us review how to start, stop, [...]