The importance of indexes, computer science homework help

Need at least 500 words.If indexes are so important, why not index every column in every table? (Include a brief discussion of the role played by data sparsity.)Hi, Please Follow these Guidelines Carefully.1. I Am expecting Great Work from you without any Plagiarism. All Work will be checked using Safe assign & Turn It in tools for plagiarism.2. Previously I Had a Problem with few tutors in this site. They have provided the same document for me & for another student. We Got 100% Match in Plagiarism and we both are suspended for a week. So Kindly Do the fresh work always and even don’t provide the answer by just modifying it from previously done works.3. Always Place in text Citations & References in APA Format.4. Take Care of Vocabulary and Grammar.5. Finally, Trust Me I will assign Maximum Works to you only in Coming Days.