這包括使用 CREATE STATISTICS 陳述式所建立的統計資料、開啟 AUTO_CREATE_STATISTICS 時所建立的單一資料行統計資料,以及針對索引所建立的統計資料。 如需有關 AUTO_CREATE_STATISTICS 的詳細資訊,請參閱<ALTER DATABASE SET 選項 (Transact-SQL)>。若要檢視資料表或檢視表的所有索引,您可以使
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 ...
syntaxsql UPDATESTATISTICS[schema_name. ]table_name[ ( {statistics_name} ) ] [WITH{FULLSCAN|SAMPLEnumberPERCENT} ] [;] 注意 Azure Synapse Analytics 的無伺服器 SQL 集區不支援此語法。 引數 table_or_indexed_view_name 包含統計數據對象的數據表或索引檢視表名稱。
Built-in system objects and extensions Control-of-flow language Data definition language (DDL) statements Introduction to DDL Securing meta data objects U-SQL databases U-SQL database schemas U-SQL tables U-SQL indexes U-SQL statistics Introduction to statistics ...
D. Update statistics by using FULLSCAN and NORECOMPUTE The following example updates theProductsstatistics in theProducttable, forces a full scan of all rows in theProducttable, and turns off automatic statistics for theProductsstatistics. USE AdventureWorks; ...
The time the task takes to create the Transact-SQL statement that the task runs is proportionate to the number of statistics the task updates. If the task is configured to update statistics in all the tables and views in a database with a large number of indexes, or to update statistics ...
1. Update Statistics 基本概念 1.1 统计更新做什么. A.为优化器optimizer收集信息 --统计信息 statistics --- LOW , update statistics low,只收集统计信息。 --分布信息 distributions -- MEDIUM & HIGH,收集统计信息和分布信息。 B.删除分布信息 drop distributions ...
Use the Update Statistics Task dialog to update Microsoft SQL Server information about the data in the tables and indexes. This task resamples the distribution statistics of each index created on user tables in the database. The distribution statistics are used by SQL Server to optimize navigation...
2086069 Fixes an issue where an authenticated attacker could affect SQL Server memory when executing a specially crafted CREATE STATISTICS or UPDATE STATISTICS statement. SQL Server Engine Query Optimizer All 2016962 FIX: Error 20598 after adding columns that have default constraints as par...
2086044 Fixes an issue where an authenticated attacker could affect SQL Server memory when executing a specially crafted CREATE STATISTICS or UPDATE STATISTICS statement. SQL Server Engine Query Optimizer All 2113374 Fixes an access violation exception that occurs on the primary replica when ...