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  • Find a Hash Collision, Win $100

    - by Mike C
    Margarity Kerns recently published a very nice article at SQL Server Central on using hash functions to detect changes in rows during the data warehouse load ETL process. On the discussion page for the article I noticed a lot of the same old arguments against using hash functions to detect change. After having this same discussion several times over the past several months in public and private forums, I've decided to see if we can't put this argument to rest for a while. To that end I'm going to...(read more)

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  • An XEvent a Day (6 of 31) – Targets Week – asynchronous_file_target

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week - ring_buffer , looked at the ring_buffer Target in Extended Events and how it outputs the raw Event data in an XML document.  Today I’m going to go over the details of the other Target in Extended Events that captures raw Event data, the asynchronous_file_target. What is the asynchronous_file_target? The asynchronous_file_target holds the raw format Event data in a proprietary binary file format that persists beyond server restarts and can be provided to another...(read more)

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  • An XEvent a Day (8 of 31) – Targets Week – synchronous_event_counter

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week - Bucketizers , looked at the bucketizer Targets in Extended Events and how they can be used to simplify analysis and perform more targeted analysis based on their output.  Today’s post will be fairly short, by comparison to the previous posts, while we look at the synchronous_event_counter target, which can be used to test the impact of an Event Session without actually incurring the cost of Event collection. What is the synchronous_event_counter? The synchronous_event_count...(read more)

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  • An XEvent a Day (2 of 31) – Querying the Extended Events Metadata

    - by Jonathan Kehayias
    In yesterdays post, An Overview of Extended Events , I provided some of the necessary background for Extended Events that you need to understand to begin working with Extended Events in SQL Server. After receiving some feedback by email (thanks Aaron I appreciate it), I have changed the post naming convention associated with the post to reflect “2 of 31” instead of 2/31, which apparently caused some confusion in Paul Randal’s and Glenn Berry’s series which were mentioned in the round up post for...(read more)

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  • An XEvent a Day (7 of 31) – Targets Week – bucketizers

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week - asynchronous_file_target , looked at the asynchronous_file_target Target in Extended Events and how it outputs the raw Event data in an XML document. Continuing with Targets week today, we’ll look at the bucketizer targets in Extended Events which can be used to group Events based on the Event data that is being returned. What is the bucketizer? The bucketizer performs grouping of Events as they are processed by the target into buckets based on the Event data and...(read more)

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  • SYS2 Scripts Updated – Scripts to monitor database backup, database space usage and memory grants now available

    - by Davide Mauri
    I’ve just released three new scripts of my “sys2” script collection that can be found on CodePlex: Project Page: http://sys2dmvs.codeplex.com/ Source Code Download: http://sys2dmvs.codeplex.com/SourceControl/changeset/view/57732 The three new scripts are the following sys2.database_backup_info.sql sys2.query_memory_grants.sql sys2.stp_get_databases_space_used_info.sql Here’s some more details: database_backup_info This script has been made to quickly check if and when backup was done. It will report the last full, differential and log backup date and time for each database. Along with these information you’ll also get some additional metadata that shows if a database is a read-only database and its recovery model: By default it will check only the last seven days, but you can change this value just specifying how many days back you want to check. To analyze the last seven days, and list only the database with FULL recovery model without a log backup select * from sys2.databases_backup_info(default) where recovery_model = 3 and log_backup = 0 To analyze the last fifteen days, and list only the database with FULL recovery model with a differential backup select * from sys2.databases_backup_info(15) where recovery_model = 3 and diff_backup = 1 I just love this script, I use it every time I need to check that backups are not too old and that t-log backup are correctly scheduled. query_memory_grants This is just a wrapper around sys.dm_exec_query_memory_grants that enriches the default result set with the text of the query for which memory has been granted or is waiting for a memory grant and, optionally, its execution plan stp_get_databases_space_used_info This is a stored procedure that list all the available databases and for each one the overall size, the used space within that size, the maximum size it may reach and the auto grow options. This is another script I use every day in order to be able to monitor, track and forecast database space usage. As usual feedbacks and suggestions are more than welcome!

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  • An XEvent a Day (9 of 31) – Targets Week – pair_matching

    - by Jonathan Kehayias
    Yesterday’s post, Targets Week – synchronous_event_counter , looked at the counter Target in Extended Events and how it could be used to determine the number of Events a Event Session will generate without actually incurring the cost to collect and store the Events.  Today’s post is coming late, I know, but sometimes that’s just how the ball rolls.  My original planned demo’s for today’s post turned out to only work based on a fluke, though they were very consistent at working as expected,...(read more)

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  • T-SQL Tuesday #006: Tiger/Line Spatial Data

    - by Mike C
    This month’s T-SQL Tuesday post is about LOB data http://sqlblog.com/blogs/michael_coles/archive/2010/05/03/t-sql-tuesday-006-what-about-blob.aspx . For this one I decided to post a sample Tiger/Line SQL database I use all the time in live demos. For those who aren't familiar with it, Tiger/Line data is a dataset published by the U.S. Census Bureau . Tiger/Line has a lot of nice detailed geospatial data down to a very detailed level. It actually goes from the U.S. state level all the way down to...(read more)

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  • SQL Server Certification - a database platform primer for your career path

    - by ssqa.net
    When you need to upgrade your knowledge then training is required, at the same time certifications will help you to keep up on what you have learned! There is a big debate on the web about whether certifications are important in your career or not, the bottomline is if you do not know the stuff or unable to answer few basic technical questions, it does'nt matter how many certifications you have then you will not get the job, well I'm not starting the same discussion here. But in the recent...(read more)

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  • SQL Server v.Next (Denali) : OS compatibility & upgrade support

    - by AaronBertrand
    Microsoft's Manageability PPM Dan Jones has asked for our feedback on their proposed list of supported operating systems and upgrade paths for the next version of SQL Server. (See the original post ). This has generated all kinds of spirited debates on twitter, in protected mailing lists, and in private e-mail. If you're going to be involved in moving to Denali, you should be aware of these proposals and stay on top of the discussion until the results are in. (The media are starting to pick up on...(read more)

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  • An XEvent a Day (31 of 31) – Event Session DDL Events

    - by Jonathan Kehayias
    To close out this month’s series on Extended Events we’ll look at the DDL Events for the Event Session DDL operations, and how those can be used to track changes to Event Sessions and determine all of the possible outputs that could exist from an Extended Event Session.  One of my least favorite quirks about Extended Events is that there is no way to determine the Events and Actions that may exist inside a Target, except to parse all of the the captured data.  Information about the Event...(read more)

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  • Security updates for all supported versions of SQL Server

    - by AaronBertrand
    It's patch Tuesday! [ UPDATE June 19 : Please see my follow-up post about this security update.] Today Microsoft released a security bulletin covering several issues that could potentially affect SQL Server; these exploits include remote code execution, denial of service, information disclosure and elevation of privilege. You should test these patches on all machines running SQL Server, including those running only client tools (e.g. Management Studio or Management Studio Express). The updates affect...(read more)

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  • Restricting logons during certain hours for certain users

    - by simonsabin
    Following a an email in a DL I decided to look at implementing a logon restriction system to prevent users from logging on at certain ties of the day. The poster had a solution but wanted to add auditing. I immediately thought of the My post on logging messages during a transaction because I new that part of the logon trigger functionality is that you rollback the connection. I therefore assumed you had to do the logging like I talk about in that post (otherwise the logging wouldn’t persist beyond...(read more)

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  • Parsing the sqlserver.sql_text Action in Extended Events by Offsets

    - by Jonathan Kehayias
    A couple of weeks back I received an email from a member of the community who was reading the XEvent a Day blog series and had a couple of interesting questions about Extended Events.  This person had created an Event Session that captured the sqlserver.sql_statement_completed and sqlserver.sql_statement_starting Events and wanted to know how to do a correlation between the related Events so that the offset information from the starting Event could be used to find the statement of the completed...(read more)

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  • DTLoggedExec 1.0 Stable Released!

    - by Davide Mauri
    After serveral years of development I’ve finally released the first non-beta version of DTLoggedExec! I’m now very confident that the product is stable and solid and has all the feature that are important to have (at least for me). DTLoggedExec 1.0 http://dtloggedexec.codeplex.com/releases/view/44689 Here’s the release notes: FIRST NON-BETA RELEASE! :) Code cleaned up Added SetPackageInfo method to ILogProvider interface to make easier future improvements Deprecated the arguments 'ProfileDataFlow', 'ProfilePath', 'ProfileFileName' Added the new argument 'ProfileDataFlowFileName' that replaces the old 'ProfileDataFlow', 'ProfilePath', 'ProfileFileName' arguments Updated database scripts to support new reports Split releases in three different packages for easier maintenance and updates: DTLoggedExec Executable, Samples & Reports Fixed Issue #25738 (http://dtloggedexec.codeplex.com/WorkItem/View.aspx?WorkItemId=25738) Fixed Issue #26479 (http://dtloggedexec.codeplex.com/WorkItem/View.aspx?WorkItemId=26479) To make things easier to maintain I’ve divided the original package in three different releases. One is the DTLoggedExec executable; samples and reports are now available in separate packages so that I can update them more frequently without having to touch the engine. Source code of everything is available through Source Code Control: http://dtloggedexec.codeplex.com/SourceControl/list/changesets As usual, comments and feebacks are more than welcome! (Just use Codeplex, please, so it will be easier for me to keep track of requests and issues) Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • An XEvent A Day: 31 days of Extended Events

    - by Jonathan Kehayias
    Back in April, Paul Randal ( Blog | Twitter ) did a 30 day series titled A SQL Server Myth a Day , where he covered a different myth about SQL Server every day of the month. At the same time Glenn Alan Berry ( Blog |Twitter) did a 30 day series titled A DMV a Day , where he blogged about a different DMV every day of the month. Being so inspired by these two guys, I have decided to attempt a month long series on Extended Events that I am going to call A XEvent a Day . I originally wanted to do this...(read more)

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  • An XEvent a Day (30 of 31) – Tracking Session and Statement Level Waits

    - by Jonathan Kehayias
    While attending PASS Summit this year, I got the opportunity to hang out with Brent Ozar ( Blog | Twitter ) one afternoon while he did some work for Yanni Robel ( Blog | Twitter ).  After looking at the wait stats information, Brent pointed out some potential problem points, and based on that information I pulled up my code for my PASS session the next day on Wait Statistics and Extended Events and made some changes to one of the demo’s so that the Event Session only focused on those potentially...(read more)

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  • An XEvent a Day (22 of 31) – The Future – fn_dblog() No More? Tracking Transaction Log Activity in Denali

    - by Jonathan Kehayias
    I bet that made you look didn’t it?  Worry not, fn_dblog() still exists in SQL Server Denali, and I plan on using it to validate the information being returned by a new Event in SQL Server Denali CTP1, sqlerver.transaction_log, which brings with it the ability to correlate specific transaction log entries to the operations that actually caused them to occur. There is no greater source of information about the transaction log in SQL Server than Paul Randal’s blog category Transaction Log . ...(read more)

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  • An XEvent a Day (24 of 31) – What is the package0.callstack Action?

    - by Jonathan Kehayias
    One of the actions inside of Extended Events is the package0.callstack and the only description provided by sys.dm_xe_objects for the object is 16-frame call stack. If you look back at The system_health Session blog post, you’ll notice that the package0.callstack Action has been added to a number of the Events that the PSS team thought were of significance to include in the Event Session. We can trigger an event that will by logged by our system_health Event Session by raising an error of severity...(read more)

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  • Parsing the sqlserver.sql_text Action in Extended Events by Offsets

    - by Jonathan Kehayias
    A couple of weeks back I received an email from a member of the community who was reading the XEvent a Day blog series and had a couple of interesting questions about Extended Events.  This person had created an Event Session that captured the sqlserver.sql_statement_completed and sqlserver.sql_statement_starting Events and wanted to know how to do a correlation between the related Events so that the offset information from the starting Event could be used to find the statement of the completed...(read more)

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  • An XEvent a Day (25 of 31) – The Twelve Days of Christmas

    - by Jonathan Kehayias
    In the spirit of today’s holiday, a couple of people have been posting SQL related renditions of holiday songs.  Tim Mitchell posted his 12 days of SQL Christmas , and Paul Randal and Kimberly Tripp went as far as to record themselves sing SQL Carols on their blog post Our Christmas Gift To You: Paul and Kimberly Singing!   For today’s post on Extended Events I give you the 12 days of Christmas, Extended Events style (all of these are based on true facts about Extended Events in SQL Server)....(read more)

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  • An XEvent a Day (23 of 31) – How it Works – Multiple Transaction Log Files

    - by Jonathan Kehayias
    While working on yesterday’s blog post The Future – fn_dblog() No More? Tracking Transaction Log Activity in Denali I did a quick Google search to find a specific blog post by Paul Randal to use it as a reference, and in the results returned another blog post titled, Investigating Multiple Transaction Log Files in SQL Server caught my eye so I opened it in a new tab in IE and went about finishing the blog post.  It probably wouldn’t have gotten my attention if it hadn’t been on the SqlServerPedia...(read more)

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  • An XEvent a Day (29 of 31) – The Future – Looking at Database Startup in Denali

    - by Jonathan Kehayias
    As I have said previously in this series, one of my favorite aspects of Extended Events is that it allows you to look at what is going on under the covers in SQL Server, at a level that has never previously been possible. SQL Server Denali CTP1 includes a number of new Events that expand on the information that we can learn about how SQL Server operates and in today’s blog post we’ll look at how we can use those Events to look at what happens when a database starts up inside of SQL Server. First...(read more)

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  • An XEvent a Day (26 of 31) – Configuring Session Options

    - by Jonathan Kehayias
    There are 7 Session level options that can be configured in Extended Events that affect the way an Event Session operates.  These options can impact performance and should be considered when configuring an Event Session.  I have made use of a few of these periodically throughout this months blog posts, and in today’s blog post I’ll cover each of the options separately, and provide further information about their usage.  Mike Wachal from the Extended Events team at Microsoft, talked...(read more)

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  • Here Comes the FY11 Earmarks Database

    - by Mike C
    I'm really interested in politics (don't worry, I'm not going to start bashing politicians and hammering you with political rage). The point is when the U.S. FY11 Omnibus Spending Bill (the bill to fund the U.S. Government for another year) was announced it piqued my interest. I'm fascinated by " earmarks " (also affectionally known as " pork "). For those who aren't familiar with U.S. politics, "earmark" is a slang term for "Congressionally Directed Spending". It's basically the set of provisions...(read more)

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