How to show open database connections in MySQL using show status and show processlist command.

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The abstract keyword is used in Java for abstraction. The abstraction is the process of selecting data and displaying only the relevant details to the object. If helps to reduce the programing complexity and the efort.

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Keywords are special words in the programing language which have reserved use in the language. Keywords may not be used as identifiers in Java; for example you cannot declare a field whose name is a keyword.

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The sitemap's a file place on your website that will enable Google and other search engines to crawl better and understand the structure of the site. Sitemaps also tell search engines which pages on your site are most important. It's a binder of your website's content.

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A robots.txt file tells search engine crawlers which pages or files the crawler can or can't request from your site. This is used mainly to avoid overloading your site with requests; it is not a mechanism for keeping a web page out of Google. To keep a web page out of Google, you should use noindex directives, or to password-protect your page.

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For a long submit operation or to avoid users clicking twice a submit button, a common solution is to disable the submit button after user clicked on it.

To disable a button using jQuery you need to add the disabled attribute to the button as true.

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