[Numbering the books sounds like creating a primary key in a database table. Fortunately we are able to query this data to help determine what â¦ In the previous query, two indicators are particularly important: frag â the level of index fragmentation in percent; page â index size in total number of its pages; There are different approaches to the interpretation of the level of index fragmentation and index optimization methods. They are as follows: The Execution plan over SQL Server DBA could be used in writing indexes. Now, assuming that the ProductID column is a "highly selective" column (selects less than 5% of the total number of rows rows using any ProductID value in the search criteria), any SELECT query that reads data from this table using the indexed column (ProductID) in the where clause should run fast, right? Keep your indexes as narrow as possible. Of having high selectivity (column which returns a low percentage (0-5%) of rows from a total number of rows on a particular value), Of type XML (primary and secondary indexes need to be created; more on this in the coming articles). Be the first to share this article with your network! But there are lots of other things you should do to optimize your database, including some advanced indexing features in SQL Server databases. Third Normal Form (3 NF) 4. A rule of thumb can be suggested as follows: if you work on a transactional database, you should not create more than 5 indexes on the tables on an average. Story for thousands of application projects developed worldwide including some advanced indexing features in SQL Server need! View execution plan over SQL Server Wait Around other ways one can Tune their SQL database in the industry. An aspiring DBA in the test environment utilizes the newly created indexes and doing the other steps... 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