UPDATE STATISTICS 可以使用 tempdb 來排序資料列的範例,以建立統計資料。 Transact-SQL 語法慣例 Syntax SQL Server 和 Azure SQL Database 的語法。 syntaxsql 複製 UPDATE STATISTICS table_or_indexed_view_name [ { { index_or_statistics__n
UPDATE STATISTICS 更新表或索引视图的查询优化统计信息。 更新统计信息可确保查询使用最新的统计信息进行编译。
步骤1:打开SQL Server Management Studio 首先,打开SQL Server Management Studio并连接到你的数据库服务器。 步骤2:选择需要更新统计信息的数据库 在Object Explorer中,展开你的数据库,然后右键单击数据库名称,选择"New Query"。 步骤3:执行Update Statistics命令 在查询窗口中,输入以下命令来更新数据库中所有表的统计...
Statistics in SQL Server are objects that contain information about the distribution of values in one or more columns of a table or index. These statistics are stored in a binary format and are used by the query optimizer to estimate the number of rows that will be returned by a query. Im...
In-Memory OLTP Partitions Plan guides Query Store Query Tuning Assistant Resource governor Statistics Statistics Create Modify Delete View Properties Rename Update Query data Reporting & Analytics Security Tools Tutorials SQL Server on Linux SQL on Azure ...
那么SQL Server 2016在更新统计数据时的默认行为是对于大表它会根据表的数据降低这个20%的数字,这样traceflag 2371就没用了。 2)UPDATE STATISTICS 选用SAMPLE是可以并行去取样。 参考: Changes to automatic update statistics in SQL Server – traceflag 2371 What's New in Database Engine...
When SQL Server introduced automatic update statistics with SQL Server 7.0 in 1998, the basic design was to keep track of the number of changes to a table. When the number of changes on a table exceeded a certain percentage threshold an automatic update of the statistics ...
Configuration of the Update Statistics Task Related Tasks See Also Applies to: SQL Server SSIS Integration Runtime in Azure Data Factory The Update Statistics task updates information about the distribution of key values for one or more statistics groups (collections) in the specified table or indexe...
Assume that you create a columnstore index on a table that has a clustered index and has no non-clustered index in Microsoft SQL Server 2012 or SQL Server 2014. When you run UPDATE STATISTICS on the clustered index, incorrec...
COUNT (SQL Server Compact) CREATE DATABASE (SQL Server Compact) CREATE INDEX (SQL Server Compact) CREATE STATISTICS (SQL Server Compact) CREATE TABLE (SQL Server Compact) DATALENGTH (SQL Server Compact) DATEADD (SQL Server Compact) DATEDIFF (SQL Server Compact) DATENAME (SQL Server Compact) DATE...