若要查看填充因子设置,请使用 fill_factorsys.indexes 目录视图中的列。 重要 创建FILLFACTOR 小于100 的索引会增加数据占用的存储空间量,因为数据库引擎在创建或重新生成索引时会根据填充因子重新分发数据。 有关详细信息,请参阅 指定索引的填充因子。 SORT_IN_TEMPDB = { ON | OFF } 指定是否将临时排序结果存储...
SQL 複製 --Drop all nonclustered indexes DROP INDEX my_index ON dbo.MyFactTable; 將數據列存放區數據表轉換成具有叢集數據行存放區索引的數據行存放區數據表。 首先,查閱現有叢集數據列存放區索引的名稱。 在步驟 1 中,我們將索引的名稱設定為 IDX_CL_MyFactTable。 如果未指定索引名稱,就會獲得...
SQL Server:DROP INDEX table_name.index_name; DB2/Oracle:DROP INDEX index_name; MySQL:ALTER TABLE table_nameDROP INDEX index_name; Exercise? What is the purpose of the SQL CREATE INDEX statement? To create a backup of a table To retrieve data more quickly by creating indexes To ensure ...
CREATE SYNONYM (Transact-SQL) CREATE TABLE (Transact-SQL) CREATE TRIGGER (Transact-SQL) CREATE TYPE (Transact-SQL) CREATE USER (Transact-SQL) CREATE VIEW (Transact-SQL) CREATE WORKLOAD GROUP (Transact-SQL) CREATE XML INDEX (Transact-SQL) ...
Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft Fabric This article describes how to add included (or nonkey) columns to extend the functionality of nonclustered indexes in SQL Server by using SQL Server Management Studio or Transact-SQL. By including nonkey columns, you...
Transact-SQL 语法约定 语法 syntaxsql CREATEFULLTEXTINDEXONtable_name[ ( {column_name[TYPECOLUMNtype_column_name] [LANGUAGElanguage_term] [STATISTICAL_SEMANTICS] } [ , ...n ] ) ]KEYINDEXindex_name[ON<catalog_filegroup_option>] [WITH(<with_option>[ , ...n ] ) ] [;]<catalog_filegroup...
CREATE FUNCTIONandPL/SQL User's Guide and Reference ASC | DESC UseASCorDESCto indicate whether the index should be created in ascending or descending order. Indexes on character data are created in ascending or descending order of the character values in the database character set. ...
from using indexed views, include the OPTION (EXPAND VIEWS) hint on the query. Also, if any of the listed options are incorrectly set, this will prevent the optimizer from using the indexes on the views. For more information about the OPTION (EXPAND VIEWS) hint, seeSELECT (Transact-SQL)....
As of MySQL 8.0.17, InnoDB supports multi-valued indexes. A multi-valued index is a secondary index defined on a column that stores an array of values. A “normal” index has one index record for each data record (1:1). A multi-valued index can have multiple index records for a sing...
Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance This article describes how to create primary and secondary XML indexes. Create a primary XML index To create a primary XML index, use the CREATE INDEX (Transact-SQL)Transact-SQL DDL statement. Not all options available for ...