In SQL, theINDEXconstraint in a column makes it faster to retrieve data when querying that column. Example -- create tableCREATETABLEColleges ( college_idINTPRIMARYKEY, college_codeVARCHAR(20)NOTNULL, college_nameVARCHAR(50) );-- create indexCREATEINDEXcollege_indexONColleges(college_code); Here...
Using the keyword ALL with this operationFails if the table has one or more REBUILD WITH ONLINE = ON XML indexSpatial indexColumnstore index in SQL Server 2017 (14.x) and older versions only. Later versions support online rebuild of columnstore indexes. REBUILD PARTITION = <partition_number> ...
Understand the characteristics of the columns used in the queries. For example, an index is ideal for columns that have an integer data type and are also unique or non-null columns. For columns that have well-defined subsets of data, you can use a filtered index in SQL Server 2008 ...
For example, this might occur with INSERT ... WITH (TABLOCK) operations. In this case, you get error 10637: Cannot perform this operation on '' with ID () as one or more indexes are currently in resumable index rebuild state. Please refer to sys.index_resumable_operations for more...
In the Fill factor row, enter the fill factor that you want. Click OK. Using Transact-SQL To specify a fill factor in an existing index In Object Explorer, connect to an instance of Database Engine. On the Standard bar, click New Query. Copy and paste the following example into the ...
SQL 複製 USE master; GO -- In this example, OBJECT_ID is evaluated in the context of the master database. -- Because Person.Address does not exist in master, the function returns NULL. -- When NULL is specified as an object_id, all objects in the database are returned. -- The ...
The following example returns information for all indexes and partitions of thePerson.Addresstable in the AdventureWorks2022 database. Executing this query requires, at a minimum, CONTROL permission onPerson.Addresstable. Important When you are using the Transact-SQL functions DB_ID and OBJECT_ID to...
The following example rebuilds an existing online index in the AdventureWorks database.SQL Copy ALTER INDEX AK_Employee_NationalIDNumber ON HumanResources.Employee REBUILD WITH (ONLINE = ON); The following example deletes a clustered index online and moves the resulting table (heap) to the ...
其中包括用户定义类型变量或函数以及用户定义函数,但不能引用 Transact-SQL 语句。 partition_number 必须存在,否则,该语句将失败。 WITH ( <single_partition_rebuild_index_option> ) SORT_IN_TEMPDB、MAXDOP、DATA_COMPRESSION和XML_COMPRESSION 是使用 (PARTITION = partition_number) 语法重新生成单个分区时可以指定...
Understand the characteristics of the columns used in the queries. For example, an index is ideal for columns that have an integer data type and are also unique or non-null columns. For columns that have well-defined subsets of data, you can use a filtered index in SQL Server 2008 ...