Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL database in Microsoft FabricThis article describes how to create a filtered index using SQL Server Management Studio (SSMS) or Transact-SQL. A filtered index is an optimized disk-based rowstore nonclustered index especially ...
A filtered index is an optimized disk-based rowstore nonclustered index especially suited to cover queries that select from a well-defined subset of data.
This article describes how to create a filtered index using SQL Server Management Studio (SSMS) or Transact-SQL. A filtered index is an optimized disk-based rowstore nonclustered index especially suited to cover queries that select from a well-defined subset of data. It uses a filter predicate ...
A filtered index is an optimized disk-based rowstore nonclustered index especially suited to cover queries that select from a well-defined subset of data.
In this article Design considerations Limitations and restrictions Permissions Create a filtered index with SSMS Show 2 more Applies to:SQL ServerAzure SQL DatabaseAzure SQL Managed Instance This article describes how to create a filtered index using SQL Server Management Studio (SSMS) or Transact-SQL...
create unique index production.nullidx on production.product(code) where production.product(code) is not null So the filter takes out the nulls. Apparently this is also really useful if you are migrating your database from another provider to SQL Server. ...
During a recent SQL Server Performance Tuning consultation, I was asked a fascinating question by a Senior DBA working with me from the client-side. Let me share this query, as I believe you will find it intriguing as well. “We often create an index on the columns used in the WHERE cl...
ref The columns compared to the index(引用到的上一个表的列) rows Estimate of rows to be examined (要得到最终记录所要扫描经过的记录数) filtered Percentage of rows filtered by table condition(存储引擎返回的数据在server层过滤后,剩下满足查询的记录数量的比例) ...
当执行一条查询的SQl的时候大概发生了一下的步骤: 客户端发送查询语句给服务器。 服务器首先检查缓存中是否存在该查询,若存在,返回缓存中存在的结果。若是不存在就进行下一步。 服务器进行SQl的解析、语法检测和预处理,再由优化器生成对应的执行计划。
About Service Packs for SQL Server Service packs are cumulative. Each new service pack contains all the fixes that are in previous service packs, together with any new fixes. Our recommendation is to apply the latest service pack and the latest cumulative update for that service...