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Performance tuning and indexing are important aspects of optimizing database performance in SQL Server.
Performance tuning involves identifying and resolving bottlenecks in the database that are affecting query performance. This can be achieved by analyzing the database design, executing the query with the execution plan, and making changes to improve query performance.
Indexing is a way to improve query performance by creating a data structure that allows for fast searching and retrieval of data. Indexes work by creating a mapping of the data in the table and storing it in a separate structure. This structure can be searched quickly, which reduces the amount of time it takes to retrieve data from the table.
The types of indexes available in SQL Server, including clustered indexes and non-clustered indexes.