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  • Visio and SQL Extended Properties: a tool to marry them

    Visio database models have column descriptions, SQL Server has extended properties where to store them but, even if they share the same producer, it seems that Visio is unable to store column descriptions in extended properties so that other tools can gather the same information easily and produce a decent documentation of a database. After some ...
    Posted to Alberto Ferrari (Weblog) by AlbertoFerrari on November 7, 2007
  • SQL: Merge two "history tracking" tables

    If you have two columns in a table that ''remember'' their old values in two different historical tables, as it is the case in AdventureWorks with EmployeePayHistory and EmployeeDepartmentHistory, you may need (or just wonder how) to merge these two tables into only one historical table that will keep track of both columns. This has ...
    Posted to Alberto Ferrari (Weblog) by AlbertoFerrari on October 15, 2007
  • PASS Followup, Technical Edition

    I have already given a rundown of most everything PASS here on my personal blog, including a series of posts with pictures too over the days of PASS) but since this blog is all about things technical with SQL Server, I wanted to just rundown of some of the cool stuff I learned about SQL Server 2008 that I hadn't heard before... You can ...
    Posted to Louis Davidson (Weblog) by drsql on September 25, 2007
  • How are GUIDs sorted by SQL Server?

    Today I ran into a nice problem with SQL Server fancy way of sorting GUIDS. I know, there should be no reason at all to sort GUID columns but, if what you need is run two tables side by side to check whether they are aligned or not (this is the task of TableDifference) and a GUID is the best key you have, then you will end up ...
    Posted to Alberto Ferrari (Weblog) by AlbertoFerrari on August 31, 2007
  • sys.dm_db_index_operational_stats

      This object provides very useful stats on how many times an index has been used, locked, waited on, etc. An index in this context can mean several things: a clustered index, heap, index, or a partition of either of these. The grain of the function is down to the partition level, so if you are working with a table that is partitioned into ...
    Posted to Louis Davidson (Weblog) by drsql on August 26, 2007
  • sys.dm_exec_query_optimizer_info

    Information about how queries have been optimized since the server has been restarted. Note that counters are only affected when there is some sort of optimization event, not on every query. (reference: http://sqlserver-qa.net/blogs/perftune/archive/2007/05/11/get-statistics-on-query-plan-optimizer-execution.aspx ) Type: View Data: Accumulating ...
    Posted to Louis Davidson (Weblog) by drsql on August 6, 2007
  • sys.dm_io_virtual_file_stats

    Excellent dmv that shows, for each file that SQL Server uses for the databases, stats on how frequently the file has been used by the database. This is one of the primary dynamic management views I use almost daily (well, not usually when I am on vacation, but even sometimes then!)  The file can be any file used in the database, including the ...
    Posted to Louis Davidson (Weblog) by drsql on July 27, 2007
  • sys.dm_db_index_usage_stats

    This object gives statistics on how an index has been used to resolve queries. Most importantly it tells you the number of times a query was used to find a single row (user_seeks), a range of values, or to resolve a non-unique query (user_scans ), if it has been used to resolve a bookmark lookup (user_lookups) and how many changes to the index ...
    Posted to Louis Davidson (Weblog) by drsql on July 22, 2007
  • sys.dm_db_file_space_usage

    Give space usage of objects in tempdb (most likely this will be extended to more than just tempdb in a future edition of SQL Server.) Can be used to see how and why space is being used in Tempdb, on a file by file basis. Type: View Data: temporal, reflects the current state of the file usage Columns: database_id – identifies the database (relates ...
    Posted to Louis Davidson (Weblog) by drsql on July 14, 2007
  • sys.dm_db_partition_stats

    For the current database, gives you space oriented statistics for each partition of indexes (even if you only have one partion), like row count, page counts, etc. Resembles the sysindexes in previous versions of SQL Server, with more information. Type: view Data: accumulating, refreshed at server restart Scope: Reset on server restart (or ...
    Posted to Louis Davidson (Weblog) by drsql on July 11, 2007
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