Syntax 引數 備註 叢集索引 顯示其他 24 個 適用於:SQL Server Azure SQL 資料庫 Azure SQL 受控執行個體Azure Synapse AnalyticsAnalytics Platform System (PDW) 在資料表或檢視上建立關聯式索引。 也稱為資料列存放區索引,因為它是叢集或非叢集的 B 型樹狀結構索引。 您可以在資料表中含有資料之前,先建...
SKAPA TABELL (Transact-SQL) Från och med SQL Server 2016 (13.x) kan du skapa en minnesoptimerad tabell med ett kolumnlagringsindex. Kolumnlagringsindexet kan också läggas till när tabellen har skapats med hjälp av syntaxen ALTER TABLE ADD INDEX. Läs in data i ett column...
该工具将 SQL 查询workload作为输入,并建议一组合适的索引。通过保持索引选择工具和查询优化器“同步”,我们确保所选择的索引能够有效降低workload的代价。为了找到最佳配置(configuration)而必须评估的索引集数量非常大。我们使用三种技术来降低这个问题的复杂性。 通过考虑查询syntax和cost信息来删除大量虚假索引 引入优化...
Specify whether the creation of the index will be logged (LOGGING) or not logged (NOLOGGING) in the redo log file. This setting also determines whether subsequent Direct Loader (SQL*Loader) and direct-pathINSERToperations against the index are logged or not logged.LOGGINGis the default. Ifinde...
For more information, see Section 15.1.9, “ALTER TABLE Statement” NDB Cluster supports online operations using the same ALGORITHM=INPLACE syntax used with the standard MySQL Server. See Section 25.6.12, “Online Operations with ALTER TABLE in NDB Cluster”, for more information. ...
syntaxsqlCopy {PAD_INDEX= {ON|OFF} |FILLFACTOR= fillfactor |IGNORE_DUP_KEY= {ON|OFF} |STATISTICS_NORECOMPUTE= {ON|OFF} |ALLOW_ROW_LOCKS= {ON|OFF} |ALLOW_PAGE_LOCKS= {ON|OFF} |OPTIMIZE_FOR_SEQUENTIAL_KEY= {ON|OFF} |SORT_IN_TEMPDB= {ON|OFF} |MAXDOP=max_degree_of_parallelism|DATA...
无论IGNORE_DUP_KEY 是否设置为 ON,SQL Server 2005 数据库引擎都不允许为已包含重复值的列创建唯一索引。否则,数据库引擎会显示错误消息。必须先删除重复值,然后才能为一列或多列创建唯一索引。唯一索引中使用的列应设置为 NOT NULL,因为在创建唯一索引时,会将多个空值视为重复值。 CLUSTERED 创建索引时,键值的...
Transact-SQL 语法约定 语法 SQL Server、Azure SQL 数据库和Azure SQL 托管实例的语法。 syntaxsql 复制 ALTER INDEX { index_name | ALL } ON { REBUILD { [ PARTITION = ALL [ WITH ( <rebuild_index_option> [ , ...n ] ) ] ] | [ PARTITION = partition_number [ WITH ( <single_partitio...
For more information, see Section 15.1.9, “ALTER TABLE Statement” NDB Cluster supports online operations using the same ALGORITHM=INPLACE syntax used with the standard MySQL Server. See Section 25.6.12, “Online Operations with ALTER TABLE in NDB Cluster”, for more information. ...
Syntax for SQL Server, Azure SQL Database, and Azure SQL Managed Instance. syntaxsql Copy ALTER INDEX { index_name | ALL } ON { REBUILD { [ PARTITION = ALL [ WITH ( <rebuild_index_option> [ , ...n ] ) ] ] | [ PARTITION = partition_number [ WITH ( <single_partition_rebuild...