Technology Questions

 .htaccess is a configuration file running on Apache server.These .htaccess file used to change the functionality and features of apache web  server .

 e.g   .htaccess file used for url rewrite .

         .htaccess file used to make the site password protected.

         .htaccess file can restrict  some ip addresses ,so that on restricted ip adresses  site will not open.

PL/SQL is Procedural Language SQL that is an extension of SQL that results in a more structural language composed of blocks. It is mainly used in writing applications that needs to be structured and has error handling.

As far PHP concern it only support single Inheritance in scripting. we can also use interface to achieve multiple inheritance.

The diamond problem is an ambiguity that can occur when a class multiply inherits from two classes that both descend from a common super class

AWT are heavy-weight componenets. Swings are light-weight components. Hence swing works faster than AWT.

The number of distinct values for a column is called index cardinality. DB2's RUNSTATS utility analyzes column value redundancy to determine whether to use a tablespace or index scan to search for data.

Encapsulation describes the ability of an object to hide its data and methods from the rest of the world 

You should not use AJAX if:

             =>  You want the page to show in a search engine, such as Google, because WebCrawler does not execute JavaScript code.

             =>  The browser does not support JavaScript.

             =>  You want to create a secure application.