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This is the official team Web Log for Microsoft Customer Service and Support (CSS) SQL Support. Posts are provided by the CSS SQL Escalation Services team.
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    In SQL 2014 and above, you can create memory optimized tables with In-Memory OLTP feature.   When you use this feature, SQL Server actually generates native code to optimize performance.  As a result, there will be dll, pdb files plus other intermediate files.  In fact, native optimization is one of three pillars of high performance.  The...

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  • 11/08/15--23:10: Are My Statistics Correct?
  • The question is often “Are my statistics up-to-date?” which can be a bit misleading.   I can make sure I have up-to-date statistics but the statistics may not be accurate.  I recently engaged in an issue where the statistics were rebuilt nightly.   A maintenance job change had been made moving from FULLSCAN to WITH SAMPLE statistics...

    Have you seen this message before? We see our customers encounter this message while performing SQL Server installation. If there is a problem, you will normally get this message in the “Instance Configuration” page of the “new SQL Server Failover Cluster setup” sequence. Here is how the screen appears with the message at the bottom:...

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    We had a customer who opened an issue with us and wanted to know the behavior of statistics during online index rebuild.  Specifically, he suspected that SQL Server might have used ‘incomplete’ statistics because his application uses read uncommitted isolation level. This type of questions comes up frequently.  I thought I’d share my research and...

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    I get to be the a good new messenger today.    We have made changes to the SQL Server Client Provider.  The provider detects when multiple IP addresses are present for a listener.   The links below detail the behavior making it easier for your multi-subnet AlwaysOn deployments. Improved MultiSubnet Listener Behavior With Newly Released SQL Client...

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    Microsoft is always seeking out ways to improve the customer experience and satisfaction.  A project that is currently active looks at the SQL Server incidents reported to Microsoft SQL Server Support and applies Machine Learning.   A specific aspect of the project is to predict when a case needs advanced assistance (escalation, onsite, development or upper...

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    If you have seen enough query plans, you for sure ran into spool operators (index spool or table spool). It is documented in https://technet.microsoft.com/en-us/library/ms181032(v=sql.105).aspx The spool operator helps improve a query performance because it stores intermediate results so that SQL doesn’t have to rescan or re-compute for repeated uses.  Spool operator has many usage. For...

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    While data for memory optimized tables resides in memory all the time with SQL Server 2014 and 2016’s In-Memory OLTP feature, we still need a means to cut down recovery time in case of crash or restart.  For disk based table, checkpoint flushes the dirty pages into data file(s).  With In-memory OLTP, there are separate set of...

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    Even with SQL Server support for so many years, we still face something new almost every day.   Sometimes you will just have to combine things together to achieve what you need.  Here is an example due to troubleshooting a customer’s issue. A couple of months ago, we ran into a need to enable a trace...

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    Microsoft is pleased to announce the release of (Transport Layer Security) TLS 1.2 support in all major client drivers and SQL Server releases. The updates made available on January 29th, 2016 provide TLS 1.2 support for SQL Server 2008, SQL Server 2008 R2, SQL Server 2012 and SQL Server 2014. The client drivers that have...