执行计划的 XML 中的MissingIndexes元素。 通过该元素,你可以将查询优化器认为缺失的索引与索引缺失的查询相关联。 一组动态管理视图 (DMV),可对其进行查询以返回有关缺失索引的信息。 这样,便可以查看数据库的所有缺失索引建议。 查看执行计划中的缺失索引建议 ...
There are several new features in SQL Server 2005. There are a few features to help find missing indexes, which are some of the very good ones. How great it will be if you know what indexes you need to create based on your workload? In SQL Server 2000, we had to use SQL Profiler ...
Use Automatic Index Management in newer version of SQL Server (2017+ or Azure SQL):Automatic Index Management Missing Indexes Script – run on a per database level. Click Copy on the code block below and give it a try! DECLARE@runtimedatetimeSET@runtime=GETDATE()-- 'Missing Indexes: '-...
When you run a SQL query, SQL Server determines what indexes it would like to use, if these are not available, it makes a note of them. You can see details of these missing indexes by using DMVs. The following SQL will identify the top 20 most important missing indexes, ordered by imp...
Missing index details omit missing indexes if a hash index exists but is not suitable for the query Issue: If you have a HASH index on columns of a memory-optimized table referenced in a query, but the index cannot be used...
If these indexes are not found, SQL Server creates a record of the missing index. This information can be viewed using the sys.dm_db_missing_index_details DMV. You can show which databases on a given server are missing indexes using the script shown in Figure 3. Discovering these missing ...
Included columns are suggested, but SQL Server performs no cost-benefit analysis regarding the size of the resulting index when a large number of included columns are suggested. Missing index requests might offer similar variations of indexes on the same table and column(s) across queries. It'...
2: qp.query_plan.value('declare default element namespace "http://schemas.microsoft.com/sqlserver/2004/07/showplan"; (/ShowPlanXML/BatchSequence/Batch/Statements/StmtSimple/QueryPlan/MissingIndexes/MissingIndexGroup/@Impact)[1]' , 'decimal(18,4)') * execution_count AS TotalImpact ...
You'll want to run this after your server has been up and running a normal workload for a while. If this returns no results, that's good news and indicates that you're not missing any indexes that are obvious enough for the DMV to detect. If it does return some suggestions, even be...
Cumulative Update 8 for SQL Server 2014 SP2 Workaround The workaround for this issue is to enable the Trace Flag(TF) 2392which will suppress the collection of missing indexes. More Information To get more information about ...