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What is the purpose of indexing SQL Server tables? What happens when queries are run against...

What is the purpose of indexing SQL Server tables? What happens when queries are run against tables that have no indexes?

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Main Purpose of indexing SQL server tables is:

  • Data can be quickly fetched from the Database on execution of query and better performance is achieved.We can also identify the records uniquely in the database and can sort the indexes instead of actual columns in the database.
  • When queries are run against tables that have no indexes then it will take more time to fetch records from database and performance is also low.Sorting takes more time as we are doing with actual records.
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