确定占用最多资源的查询是所有数据库性能优化工作的第一步。 在旧版 SQL Server 中,这需要大量的跟踪和一系列复杂的 SQL 脚本,这可能会导致数据收集过程变得繁琐。 识别有问题的查询 Azure SQL 数据库提供了名为“查询性能见解”的工具,管理员可以通过该工具快速识别成本高昂的查询。 可以在 Azure SQL 数据...
New naming schema for Microsoft SQL Server software update packages For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: 824684 Description of ...
Filtered statistics use a filter predicate to select the subset of data that is included in the statistics. Well-designed filtered statistics can improve the query execution plan compared with full-table statistics. For more information about the filter predicate, see CREATE STATISTICS (Transact-SQL)...
In SQL Server 2008, there is no internal indicator to suggest to the synchronization threads that the refreshed database schema design has or has not been altered, compared with the existing database schema design. Therefore, ea...
This lesson shows you how to create a database, create a table in the database, and then access and change the data in the table. Because this lesson is an introduction to using Transact-SQL, it doesn't use or describe the many options that are available for these statements. Transact-...
The following sections describe the toolbar buttons and query designer panes for each mode of the graphical query designer. Graphical MDX Query Designer in Design Mode When you edit an MDX query for a report dataset, the graphical MDX query designer opens in Design mode. ...
This lesson shows you how to create a database, create a table in the database, and then access and change the data in the table.
This example uses the variable name, SqlDataQuery.With the package variable created, you can use either a Script task or Execute SQL task to concatenate the values of the input parameters. The following two procedures describe how to configure these components.To...
Figure 9.1 and the following steps describe how the correlated subquery is evaluated in Example 1: The outer query passes a column value to the inner query. The outer query passes the value from the OrderID column to the inner query. ...
For this reason, SQL queries are understood to deal with multisets (bags) instead of sets. The following paragraphs describe the differences between the Standard Query Operators and their SQL translation for the SQL Server provider for LINQ to SQL. Operator Support Concat The Concat method is ...