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  • Embrace R @ SQL Nexus 2017 & SQL Saturday #626

    R is the hottest topic in SQL Server 2016. If you want to learn how to use it for advanced analytics, join my seminar at SQL Nexus conference on my 1st in Copenhagen. Although there is still nearly a month before the seminar, there are less than half places still available. You are also very welcome to visit my session Using R in SQL Server, Power ...
    Posted to Dejan Sarka (Weblog) by Dejan Sarka on April 2, 2017
  • Data Mining Algorithms – Pluralsight Course

    This is a bit different post in the series about the data mining and machine learning algorithms. This time I am honored and humbled to announce that my fourth Pluralsight course is alive. This is the Data Mining Algorithms in SSAS, Excel, and R course. besides explaining the algorithms, I also show demos in different products. This gives you even ...
    Posted to Dejan Sarka (Weblog) by Dejan Sarka on July 30, 2015
  • Data Mining Algorithms – EM Clustering

    With the K-Means algorithm, each object is assigned to exactly one cluster. It is assigned to this cluster with a probability equal to 1.0. It is assigned to all other clusters with a probability equal to 0.0. This is hard clustering. Instead of distance, you can use a probabilistic measure to determine cluster membership. For example, you can ...
    Posted to Dejan Sarka (Weblog) by Dejan Sarka on May 12, 2015
  • Data Mining Algorithms – K-Means Clustering

    Hierarchical clustering could be very useful because it is easy to see the optimal number of clusters in a dendrogram and because the dendrogram visualizes the clusters and the process of building of that clusters. However, hierarchical methods don’t scale well. Just imagine how cluttered a dendrogram would be if 10,000 cases would be shown on ...
    Posted to Dejan Sarka (Weblog) by Dejan Sarka on April 17, 2015
  • Data Mining Algorithms – Hierarchical Clustering

    Clustering is the process of grouping the data into classes or clusters so that objects within a cluster have high similarity in comparison to one another, but are very dissimilar to objects in other clusters. Dissimilarities are assessed based on the attribute values describing the objects. There are a large number of clustering algorithms. The ...
    Posted to Dejan Sarka (Weblog) by Dejan Sarka on March 28, 2015
  • Microsoft SQL Server High-Availability Videos and Q&A Log

    You Want Videos? We Got Videos! I always enjoy getting the chance to catch up with author, consultant, and Microsoft Clustering MVP Allan Hirt. Allan and I recently presented two sessions covering an overview of high availability in Microsoft SQL Server and, the following week, a demo of how to implement several different kinds of high ...
    Posted to Kevin Kline (Weblog) by KKline on December 1, 2010
  • Clustering Utility Made Available by Microsoft

      The CSS team just made me aware of a new utility for cluster’s called the Remote Desktop Connection Manager. I don’t want to just repeat what has already been said so go ahead and have a look here for the details: http://blogs.msdn.com/b/clustering/archive/2010/06/23/10028855.aspx
    Posted to Andrew Kelly (Weblog) by Andrew Kelly on June 29, 2010
  • Long time SQL Cluster issue resurfaced

    It is interesting as time goes on, what things are found by others that have already been reported, but seem to be ignored.  SQL 2005 Clustering issue with lower case servernames is the topic of this post.  I attended a Clustering Class by Russ Kaufmann and during the class I illustrated to him a problem that we had in installing a ...
    Posted to Ben Miller (Weblog) by dbaduck on January 11, 2010
  • Installing Service Packs / Cumulative Updates on a SQL 2005 cluster

    In our environment, we run the task scheduler as a cluster resource, so that scheduled tasks always run on the active node.  (In ancient history, we would have scheduled tasks that weren't cluster aware - in the event of a failover, we'd have to manually disable task scheduler on the now passive node, and manually enable it on the active ...
    Posted to Aaron Bertrand (Weblog) by AaronBertrand on November 20, 2009
  • Managing multi-instance cluster failovers with different hardware

    Windows Clustering no longer requires identical hardware Because you can now easily create Windows clusters with different metal, I hear more and more about environments where nodes in a cluster are vastly different.  Whether this is because they can only deck out one server at a time, or because they need to mix older and newer hardware, it ...
    Posted to Aaron Bertrand (Weblog) by AaronBertrand on September 18, 2009
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