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Statistics refers to the statistical information about the distribution of values in one or more columns of a table or an index.The SQL Server Query Optimizer uses this statistical information to estimate the cardinality, or number of rows, in the query result to be returned, which enables the SQL Server Query Optimizer to create a high-quality query execution plan.

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As part of our ongoing discussions comparing SQL Server to Oracle, Jonathan Lewis and I are going to be talking about statistics next.SQL Server's Query Optimiser relies on statistics for providing a decent query plan.If the statistics are wrong, outdated or missing then you have little realistic hope of having queries that perform well.We recommend not updating statistics too frequently because there is a performance tradeoff between improving query plans and the time it takes to recompile queries. UPDATE STATISTICS can use tempdb to sort the sample of rows for building statistics.Updates query optimization statistics on a table or indexed view.

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