An expression that does not use SARG operators does not improve performance, because the SQL Server Compact Edition query processor has to evaluate every row to determine whether it meets the filter clause. Therefore, an index is not useful on expressions that do not use SARG operators. Non-...
SQL Server Compact includes support for showplans, which help assess and optimize queries. SQL Server Compact uses the same showplan schema as SQL Server 2008 R2 except SQL Server Compact uses a subset of the operators. For more information, see the Microsoft Showplan Schema at https://schemas...
《SQL Server 2005性能调校》以定义、架构为出发点,深入探讨SQL Server的运行原理,并说明如何通过适当的工具去探索数据库有关性能的相关问题。笔者期望能以在业界管理SQLServer的相关经验,并参考文献中的相关信息,能为读者在面临数据库性能问题时,提供一些有效的解决方法。 作者简介 ··· 现任恒逸资讯资深讲师、微软...
Leverage SQL tuning tools with Response Time Analysis At the core of Response Time Analysis is the wait event or wait type, which refers to when a server process or thread must wait for an event to complete or resources to become available before being able to continue processing the query....
DBA 不仅能够掌握调校技能，更能够领略其中的智慧和策略，从而在实际工作中灵活运用，提升系统性能，为用户提供更优质的服务。本书是 SQL Server DBA 进行性能调校不可或缺的参考资料，通过阅读本书，DBA 可以在实践中不断提升自己的技能，为复杂多变的数据库环境提供稳定、高效的解决方案。
SQL Server now choses a Clustered Scan but does not process the descending order clause with a parallel scan even while the Estimated Subtree Cost is over 17%. That’s because, currently a BACKWARD scan is not possible with parallelism. It is good to be aware of such implications ...
性能调校是数据库管理中至关重要的环节，它涉及如何优化SQL Server 2005的执行效率，降低资源消耗，提升数据访问速度以及确保系统的稳定运行。本书从多个角度出发，全面覆盖了性能调校所需的理论知识和实践技能，包括但不限于查询优化、索引设计、缓存管理、并发控制、硬件配置与调优等核心主题。通过丰富的...
SQL Server性能优化(1) – Performance - Tuning Query Analyzer Execution plan.
1. Start SQL Server Management Studio and connect to SQL Server. 2. In the query window, type and execute the following T-SQL script to create a new trace through system stored procedures: DECLARE@ReturnCodeINTDECLARE@TraceIDINTDECLARE@OptionsINT=2DECLARE@TraceFileNVARCHAR(245)='C:\MyTraces\...