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• Site Icon Hash in stackauth.com/sites

  - by Jonathan

  How do I cache the images properly, I think asked this somewhere before, but it hasn't affected me until gameing site went out of beta. It's HTTP headers or something isn't Ok I used George's answer but frankly the performance is awful, asking the server for the image everytime (even when it doesn't download the image) creates a small delay of about 1/2 a second but because of the huge number of SE sites, the 1/2s add up. Please, please consider adding a hash of the image to the stackauth.com/sites

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• Some thoughts on the Virtualization Feedback in the SSWUG Newsletters

  - by Jonathan Kehayias

  Last Thursday, March 25, 2010, the topic of Virtualization of SQL Server came up in the SSWUG Newsletter , with Steven Wynkoop asking if peoples perceptions and experiences have changed since the last time he covered virtualizing SQL Server.  I unfortunately missed the last coverage of this topic, but it appears from the newsletter that there was a general consensus that “low-traffic solution could be fine, but if you had a heavy hitting application, the net advise was to avoid a virtual environment...(read more)

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• SQL Server Installation Checklist

  - by Jonathan Kehayias

  The other night I was asked on Twitter by Todd McDonald (Twitter), for a build list for SQL Server 2005 and 2008.  My initial response was to provide a link to the SQL Server Build List Blog , which documents all of the builds of SQL Server and provides links to the KB articles associated with the builds.  However, this wasn’t what Todd was after, he actually wanted a reference for an installation checklist for SQL Server.  I have a number of these that I use in my job, and they vary...(read more)

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• Some thoughts on the Virtualization Feedback in the SSWUG Newsletters

  - by Jonathan Kehayias

  Last Thursday, March 25, 2010, the topic of Virtualization of SQL Server came up in the SSWUG Newsletter , with Steven Wynkoop asking if peoples perceptions and experiences have changed since the last time he covered virtualizing SQL Server.  I unfortunately missed the last coverage of this topic, but it appears from the newsletter that there was a general consensus that “low-traffic solution could be fine, but if you had a heavy hitting application, the net advise was to avoid a virtual environment...(read more)

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• Times they are a changing…

  - by Jonathan Kehayias

  If you follow me on twitter ( @SQLSarg ), you already know that this has been a week of big announcements for me. Wednesday afternoon Paul Randal ( Blog | Twitter ) announced that I joined SQLskills.com as a full time employee, and Thursday afternoon, Joe Sack ( Blog | Twitter ) announced that I passed the Microsoft Certified Masters for SQL Server 2008 . As a part of my transition to working for SQLskills.com full time, I will be changing blogs over to the SQLskills.com site. You can read about...(read more)

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• Want to know how SQL Server logging works?

  - by Jonathan Kehayias

  Have you ever wondered why SQL Server logging works the way it does?  While I have long understood the importance behind the SQL Server Transaction Log, I have never actually understood exactly why it works the way it does, despite having attended Paul Randal’s ( Blog / Twitter ) session at PASS Summit last year.  Over the last few months I have been working on writing a book on troubleshooting the most common problems that I see asked on the forums, and as a part of that I have been digging...(read more)

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• Making Use of Plan Explorer in my own Environment

  - by Jonathan Kehayias

  Back in October 2010, I briefly blogged about the SQL Sentry Plan Explorer in my blog post wrap up for SQL Bits 7 and how impressed I was with what I saw from a Alpha demo standpoint from Greg Gonzalez ( Blog | Twitter ) while I was at SQLBits 7 in York.  To be 100% honest and transparent, Greg gave me early access to this tool after discussing it at SQLBits 7, and I had the opportunity to test a number of pre-Beta releases where I was able to offer significant feedback and submit bugs in the...(read more)

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• ID number for sites [closed]

  - by Jonathan

  Possible Duplicate: please add a key fields to stackauth results It would be easier if sites each had an ID, it help with keeping track of them, not only in a numerical way (which is generally easier and smaller than using name strings). Also changes of site names (such as when a site progresses from beta, or decides it's name is not quite right during beta). Everything else has IDs so why not sites?

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• Working with Sub-Optimal Disk Configurations (Making the best of what you’ve got)

  - by Jonathan Kehayias

  This is the first post in a what will be a series of posts on working with a sub-optimal disk configuration to squeeze as much performance out of it as possible.  You might ask what a Sub-Optimal Disk Configuration?  In this case it is a Dell Powervault MD3000 with 15 Seagate Barracuda ES.2 SAS 1 TB 7.2K RPM disks (Model Number ST31000640SS).  This equates to just under 14TB of raw storage that can configured into a number of RAID configurations.  In this case, the disk array...(read more)

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• Today’s Performance Tip: Views are for Convenience, Not Performance!

  - by Jonathan Kehayias

  I tweeted this last week on twitter and got a lot of retweets so I thought that I’d blog the story behind the tweet. Most vendor databases have views in them, and when people want to retrieve data from a database, it seems like the most common first stop they make are the vendor supplied Views.  This post is in no way a bash against the usage or creation of Views in a SQL Server Database, I have created them before to simplify code and compartmentalize commonly required queries so that there...(read more)

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• iStack for iPad

  - by Jonathan

  The below image is the current, and hopefully final, look of the front screen, the app will remember which stack site you have chosen so the user will only see this screen the first time, but they can always go back and change it. The red bar is only there when a new site is added (the StackOverflow is just a test as no site has been added since I implemented this) and can be gotten rid of by tapping the X on the right side (which isn't in the screenshot). Each column now has an edit button where the sites can be rearranged and moved from favourites to non favourites and this is persistent between app launches, moving a site in one column moves it in all of them. I've removed site icons in order to put them in properly so they load lazily and theres no UI freezing. Printing Functionality all implemented and working, thanks to systempuntoout's stackprinter.com works with AirPrint, which means this app will be iOS 4.2 minimum. Current features: 3 columns Email link to question, open in safari and copy link actions History for both questions and sites visited In app notification (red bar at the top) when a new site makes it into beta. StackPrinter in the app, without needing safari, and AirPrint functionality. Facebook Intergration Planned: Local Favourites Watching (a list of questions your watching, like short term favourites, with eventually push notifications) Web service to access local favourites and watches on non-iPad devices. Twitter integration. Safari bookmarklet to open question in iStack from safari In app notification for when site progresses from beta to normal. In app notification history

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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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• What do DBAs do?

  - by Jonathan Conway

  Yes, I know they administrate databases. I asked this question because I'd like to get a further insight into the kind of day-to-day duties a DBA might perform, and the real-world business problems they solve. For example: I optimized a 'products' query so that it ran 25% faster, which made the overall application faster. Is this a typical duty? Or is there more to being a DBA than simply making things faster? In what situations does DBA work involve planning and creativity?

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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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• Learn Who Started that Trace with the Default Trace

  - by Jonathan Kehayias

  This is not Extended Event related but it came from a question on Twitter about how to tell who and from what machine a server side trace was created, and there is no way to explain this in 140 characters so here’s a blog post.  This information is tracked in the Default Trace and can be found by querying for EventClass 175 which is the Audit Server Alter Trace Event trace_event_id from sys.trace_events. select trace_event_id , name from sys . trace_events where name like '%trace%' To query...(read more)

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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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• JavaScript objects and Crockford's The Good Parts

  - by Jonathan

  I've been thinking quite a bit about how to do OOP in JS, especially when it comes to encapsulation and inheritance, recently. According to Crockford, classical is harmful because of new(), and both prototypal and classical are limited because their use of constructor.prototype means you can't use closures for encapsulation. Recently, I've considered the following couple of points about encapsulation: Encapsulation kills performance. It makes you add functions to EACH member object rather than to the prototype, because each object's methods have different closures (each object has different private members). Encapsulation forces the ugly "var that = this" workaround, to get private helper functions to have access to the instance they're attached to. Either that or make sure you call them with privateFunction.apply(this) everytime. Are there workarounds for either of two issues I mentioned? if not, do you still consider encapsulation to be worth it? Sidenote: The functional pattern Crockford describes doesn't even let you add public methods that only touch public members, since it completely forgoes the use of new() and constructor.prototype. Wouldn't a hybrid approach where you use classical inheritance and new(), but also call Super.apply(this, arguments) to initialize private members and privileged methods, be superior?

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• Master database Compatibility level after an In-place Upgrade

  - by Jonathan Kehayias

  Yesterday a forums member asked why sys.dm_exec_sql_text() wouldn’t work on one instance of SQL where he was a sysadmin while the same code worked correctly on another instance of SQL.  The initial thought was that it was some kind of permissions issue.  Ken Simmons ( blog / twitter ) pointed out that the compatibility level of the database would affect the ability to use this DMF and that running it from a database at 80 compatibility would fail.  It turns out the person was running...(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 (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 (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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• The Database as Intellectual Property

  - by Jonathan Kehayias

  Every so often, a question shows up on the forums in the form of, “How do I prevent anyone from accessing my database schema, including local administrators and sysadmins in SQL Server?”  I usually laugh a little shake my head when I read a question like this because it demonstrates an complete lack of understanding of the power an administrator has over SQL Server.  The simple answer is this: If you don’t want your database schema to ever be accessed or known, don’t distribute your database....(read more)

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