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A scenario where it can be used is when you want to find no. Querying data is faster when there is no index in a table. A typical use case can be where there are range-based queries on the primary key.
#Sql server client application questions full#
Now finding the number of people in a given country will be much faster otherwise you will have to do the full table scan to get the answer. What you’ll do? You’ll make another table with columns ‘country’ and ‘count_of_people’ which is sorted by the country name. For example, if you have a phone_book table where it is sorted by the name of a person and you want to know the count of people living in a specific country. Think of it as another table with few columns sorted together. This is an index structure that is separate from the actual table which sorts one or more selected columns.
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It physically sorts the rows of a table based on the primary key or on a column that is unique and not null (generally we use primary key). It avoids full table scans.ĭifference Between Clustered and Non-Clustered Index Clustered Index It helps in quickly locating and accessing the data in the database. Indexing is a way of optimizing database query time. What is the difference between clustered and non-clustered index? When a single clustered index and more than one non-clustered indexes are present.Ĥ. A clustered index and many non-clustered indexes:.When a single clustered index and a single non-clustered index is present. A clustered index and a non-clustered index:.When more than one non-clustered indexes is present. When only a single non-clustered index is present. When only a single clustered index is present. Describe the different index configurations possible for a table?ĭifferent index configurations possible for a table are: This can be done by changing the TCP/IP properties from configuration-box in SQL Server.ģ. We can configure the server to listen to a specific port. Which TCP/IP port does SQL Server run on?īy default SQL Server runs on port 1433. There are several editions of SQL Server serving different audiences.Ģ. Microsoft developed SQL Server on April 24, 1989. It provides the functionality of storing and retrieving data to applications. SQL Server is a relational database management system.