<>对有table scan或者index scan的地方,仔细检查是否缺少索引?运行Database tuning wizard对该语句分析下,或者手工加上索引看看。也可以查询sys.dm_db_missing_index_details来看看系统是否大量缺少index。 <>join的类型是否合适,使用join hint试试试用不同的join类型。 <>使用index hint
STATS_DATE(object_id, index_id)ASupdate_dateFROMsys.indexesWHEREobject_id=OBJECT_ID('[Sales].[SalesOrderDetail]');--查看所有统计信息更新时间selects.name,STATS_DATE(s.object_id, stats_id)ASupdate_datefromsys.stats sWHEREs.object_id=OBJECT_ID('...
Fabric 中 SQL Server、Azure SQL 数据库和 SQL 数据库的语法: syntaxsql复制 [FROM{} [ , ...n ] ]::={table_or_view_name[FORSYSTEM_TIME<system_time>] [ [AS]table_alias] [<tablesample_clause>] [WITH(< table_hint >[ [ , ] ...n ] ) ] |rowset_function[ [AS]table_alias] [...
syntaxsql复制 <query_hint>::={ {HASH|ORDER}GROUP| {CONCAT|HASH|MERGE}UNION| {LOOP|MERGE|HASH}JOIN|DISABLE_OPTIMIZED_PLAN_FORCING|EXPANDVIEWS|FAST<integer_value>|FORCEORDER| {FORCE|DISABLE}EXTERNALPUSHDOWN| {FORCE|DISABLE}SCALEOUTEXECUTION|IGNORE_NONCLUSTERED_COLUMNSTORE_INDEX|KEEPPLAN|KEEPFIXEDPLAN...
参数 node 类型:Microsoft.SqlServer.TransactSql.ScriptDom.IndexTableHint The specified fragment type. 请参阅 参考 TSqlFragmentVisitor 类 Visit 重载 Microsoft.SqlServer.TransactSql.ScriptDom 命名空间
syntaxsql Copier [ FROM { } [ , ...n ] ] ::= { table_or_view_name [ FOR SYSTEM_TIME <system_time> ] [ [ AS ] table_alias ] [ <tablesample_clause> ] [ WITH ( < table_hint > [ [ , ] ...n ] ) ] | rowset_function [ [ AS ] table_alias ] [ ( bulk_column...
[OPTION ( <query_hint> [ , n]) ] 2. FORCESEEK 提示 FORCESEEK 是一个新的表提示(Table Hints),它用来指定 SQL Server 查询优化程序如何更高效的执行查询。该提示指示优化程序对查询引用的表和视图通过索引检索来作为唯一的查询执行访问路径。也就是强制通过索引检索数据。例如: ...
Query hint Query hint This query hint is not inside natively compiled stored procedures. For supported query hints see Query Hints (Transact-SQL). Option PERCENT This option is not supported with TOP clauses. Remove PERCENT from the query in the natively compiled stored procedure. Option WITH TI...
[ OPTION ( <query_hint> [ ,...n ] ) ] 2. FORCESEEK 提示 FORCESEEK 是一个新的表提示(Table Hints),它用来指定 SQL Server 查询优化程序如何更高效的执行查询。该提示指示优化程序对查询引用的表和视图通过索引检索来作为唯一的查询执行访问路径。也就是强制通过索引检索数据。例如: ...
IndexOptionKind IndexStatement IndexStateOption IndexTableHint IndexType IndexTypeKind InlineDerivedTable InlineFunctionOption InlineResultSetDefinition InPredicate InsertBulkColumnDefinition InsertBulkStatement InsertMergeAction InsertOption InsertSource InsertSpecification InsertStatement IntegerLiteral...