Esoteric

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  • Blog Post: Exotic spinlocks: X_PACKET_LIST and XID_ARRAY

    A Twitter conversation sparked this blog post; the question there was about the relevance of the X_PACKET_LIST spinlock. As with most spinlocks, there is no public documentation on this one, and that is primarily because the spinlock is an implementation detail and can change from release to release...
  • Blog Post: “Could not add cluster access…” during SQL 2012 Failover Cluster Instance setup

    Today a lab setup of SQL 2012 SP1 + CU7 (I was using the /UpdateSource flag to have a patched setup + roll in the updated bits in one go) failed sometime before creating the SQL resource in cluster. The error message from the detail.txt file showed: Could not add cluster access for SID ‘S-1-5-80-2358576813...
  • Blog Post: Data Quality Services (DQS) and Failover Cluster instances

    One of my customers made the observation that it is not possible to uncheck the Data Quality Services component in the Feature Selection screen in SQL Server 2012 setup. The interesting thing was that she clearly recalled that earlier it was possible to select it (the default was unchecked), and we wondered...
  • Blog Post: Aviation BI Project - Part 1: Requirements

    Background One of my hobbies is following the commercial aviation scene. My job requires me to fly around a lot, and that only sparks my curiosity further around how the commercial aviation business works. What better then, that to use this hobby as a motivation to test new features in SQL Server...
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