As usual with these talks, I don’t have a clue how things work in Oracle, so I’m looking forward to the education.
But, I have something of a handle on how statistics work in SQL Server.
This includes statistics created using the CREATE STATISTICS statement, single-column statistics created when AUTO_CREATE_STATISTICS is on, and statistics created for indexes.
For more information about AUTO_CREATE_STATISTICS, see can be from 0 to the total number of rows.
SQL Server's Query Optimiser relies on statistics for providing a decent query plan.
In this article series, I am going to talk about statistics in detail.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.SQL Server Query Optimizer uses statistics to estimate the distribution of values in one or more columns of a table or index views, and the number of rows (called ) to create a high-quality query execution plan.Often statistics are created on a single column but it’s not uncommon to create statistics on multiple columns.