In order to use MySql server, you need to start it by typing 'C:mysqlbinmysqld' on the MS-DOS window but at times this startup command does not prove to be useful one in starting MySqlD server often in the cases when database goes corrupt or damaged followed by which 'Default storage engine innodb is not available' error appears on the screen.
You might face problems while using Mysql database such as complete inaccessibility of tables and other database objects and the reason for all these problems is the table corruption and can even lead to various errors including mysql error 144 or even severe data loss situations and then the best is to opt for msysql repair tool.
InnoDB is considered as a default storage engine of Mysql which is integrated with a number of advanced features including compliant transactions and foreign keys supporting ACID (Atomicity, Consistency, Isolation and Durability) properties.
There are various situations where you might face Mysql database corruption either due to virus attack, improper system shutdown or because of any kind of physical damage after which all your data stored within the database gets inaccessible and the search query do not show you any results and you face mysql database empty post corruption but in all of these situations an updated backup is required that will help you to restore the inaccessible data. But in case of absence of a database backup, mysql repair tool needs to be opted.