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Oracle固定SQL的执行计划(二)—SPM

之前写了一篇文章介绍的是用SQL Profile来调整、稳定目标SQL的执行计划,即使无法修改目标SQL的SQL文本。但SQL Profile实际上只是一种亡羊补牢、被动的技术手段,应用在那些执行计划已经发生了不好的变更的SQL上,即当我们发现这些SQL的执行计划已经出了问题时通过创建SQL Profile来纠正、稳定这些SQL的执行计划。即便通过创建SQL Profile解决了目标SQL执行计划变更的问题,依然不能保证系统后续执行的SQL的执行计划就不再发生不好的变更。这种不确定性会给Oracle数据库大版本升级(比如从Oracle 10g升级到Oracle 11g)带来一系列的麻烦,因为不清楚升级之后原先系统中哪些SQL的执行计划会发生不好的变更。

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部署Skype for Business Server 2015 数据库SQL 高可用AlwayOn

原文链接:http://blogs.technet.com/b/uclobby/archive/2015/05/08/deploying-sql-server-alwayson-availability-group-for-skype-for-business-server-2015.aspx Deploying SQL Server AlwaysOn Availability Group for Skype for Business Server 2015      In Lync Server 2013, there were requests regarding an alternative to SQL Mirroring for SQL Server High Availability. This was related to the fact that SQL Mirroring was marked as a feature to be removed in future SQL Server versions: This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature. Use AlwaysOn Availability Groups instead. in SQL Server 2014 - Database Mirroring (SQL Server) - https://msdn.microsoft.com/en-us/library/ms189852.aspx In Lync Server 2013, it was common to have SQL Server High Availability using SQL Mirroring. The reason for this was that Topology Builder did all the hard work for us. Another supported scenario was to use SQL failover clustering, but in this case we need to manually deploy it: Database software support in Lync Server 2013 https://technet.microsoft.com/en-us/library/gg398990.aspx The good news is Skype for Business Server 2015 comes with AlwaysOn Availability Groups:

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