CHECKPOINTQUESTION:An essential component of modern relational database management systems is the query optimizer. Explain what the query optimizer is, and describe the decision making process the query optimizer uses in order to automatically generate efficient query execution. Based on your explanation, it should be clear to you that the query optimizer can only work with the tools that you, the database architect, provide. For example, the query optimizer cannot make use of an index that would dramatically speed query results, if you have not created the index. Nor can the query optimizer automatically inform you of this serious omission. However, there are other tools, such as the EXPLAIN, ANALYZE, and OPTIMIZE commands which will provide the information you need in order to detect and address the need for indexes, objects, or modifications in the data model which can dramatically improve DBMS performance.2. Start/Connect to MySQL.3. If you have modified or deleted the schema and data model used for Lab

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a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.