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• A Simple but Robust WPF Report Engine, Part 1

  a simple WPF report engine that is robust and one can use it in practical applications  read moreBy siyamand ayubiDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Wrong statistics in AUX_STATS$ might puzzle the optimizer

  - by Mike Dietrich

  We do recommend the creation of System Statistics for quite a long time. Since Oracle 9i the optimizer works with a CPU and IO cost based model. And in order to give the optimizer some knowledge about the IO subsystem's performance and throughput - once System Statistics are collected - they'll get stored in AUX_STATS$. For this purpose in the old Oracle 9i days some default values had been defined - and you'll still find those defaults in Oracle Database 11g Release 2 in AUX_STATS$. But these old values don't reflect the performance of modern IO systems. So it might be a good best practice post upgrade to create fresh System Statistics if you haven't done this before.  You can collect System Statistics with: exec DBMS_STATS.GATHER_SYSTEM_STATS('start'); and end it later by executing: exec DBMS_STATS.GATHER_SYSTEM_STATS('stop'); You could also run DBMS_STATS.GATHER_SYSTEM_STATS('interval', interval=>N) instead where N is the number of minutes when statistics gathering is stopped automatically. Please make sure you'll do this on a real workload period. It won't make sense to gather these values while the database is in an idle state. You should do this ideally for several hours. It doesn't affect performance in a negative way as the values are anyway collected in V$SYSSTAT and V$SESSTAT. And in case you'd like to delete the stats and revert to the old default values you'd simply execute:exec DBMS_STATS.DELETE_SYSTEM_STATS; The tricky thing in Oracle Database 11.2 - and that's why I'm actually writing this blog post today - is bug9842771. This leads to wrong values in AUX_STATS$ for SREADTIM and MREADTIM by factor 1000 guiding the optimizer sometimes into the totally wrong directon. The workaround is to overwrite these values manually and divide them by 1000. Use the DBMS_STATS.SET_SYSTEM_STATS procedure. See this MOS Note:9842771.8 for the above bug for some further information. This issue is fixed in Oracle Database 11.2.0.3 and above. To get some background information about the statistics collected in please read this section in the Oracle Database 11.2 Performance Tuning Guide. And gathering System Statistics might have some implication if you have mixed workloads - and interacts with DB_FILE_MULTIBLOCK_READ_COUNT. For more information please read section 13.4.1.2.

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• Ghost in the machine

  - by GrumpyOldDBA

  Well it does relate to ghosts, in this case dbGhost, http://dbghost.com/    which is what this post is about. Ghost creates databases on the fly, something I personally don’t like too much, which it then compares to a “base” database to produce release scripts. ( The brief description ). As with all things sometimes all is not well and the server is left with a number of ghost created databases so I have to have a job to delete these every night before backups, it’s not difficult to code...(read more)

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• Optimizing Transaction Log Throughput

  As a DBA, it is vital to manage transaction log growth explicitly, rather than let SQL Server auto-growth events "manage" it for you. If you undersize the log, and then let SQL Server auto-grow it in small increments, you'll end up with a very fragmented log. Examples in the article, extracted from SQL Server Transaction Log Management by Tony Davis and Gail Shaw, demonstrate how this can have a significant impact on the performance of any SQL Server operations that need to read the log.

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• RightNow stunning references: Spotlight on "The Boston Globe"

  - by Richard Lefebvre

  The Boston Globe’s World Class Contact Center Improves Customer Service and Retention with Oracle Web, Mobile, and Social Media Solutions. “Oracle RightNow solutions help us deliver exceptional customer support to both print customers and our technology-savvy digital customers. Whether customers are chatting online with an agent or finding answers from their mobile devices, Oracle RightNow solutions help our clients get the information they need anytime, anywhere.” ? Robert Saurer, Director of Customer Care and Marketing, The Boston Globe Read the full Press Release here

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• Getting the right results with bcp and DTS with multiple versions of SQL Server installed.

  - by fatherjack

  I was using SSIS for the first time on an instance the other day and came across this error when I executed a package Package migration from version 3 to version 2 failed with error 0xC001700A. The version number in the package is not valid. The version number cannot be greater than current version number. This was a pain and wasn't something that I was expecting, however, the error message made sense - the package was being executed by the wrong version of the executable. Not impossible to...(read more)

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• Friday Sept 21 in London: SharePoint 2013 Planet of the Apps

  - by Sahil Malik

  SharePoint 2010 Training: more information Greetings everyone! I will be talking about Apps and more in SharePoint 2013, followed by drinks and canapes. There are only 2 aims for this talk, To have fun To learn about SharePoint 2013. This is a freebie event, I’d highly recommend registering. When: Friday 21st, 2-6PM.Where: Here - http://www.principal-hayley.com/browse-our-hotels/grand-connaught-rooms.aspx Read full article ....

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• Best Ruby Git library?

  - by Jeff Welling

  Which is the best Git library in Ruby to use? Git, Grit, Rugged, Other? Background: I'm the current maintainer of TicGit-ng which is a distributed offline ticket system built on git, and I've read and heard over and over again that Grit is the one I should use because it supersedes the Git gem, but there seems to be either a lack of documentation or a lack of features because myself and others have failed in trying to switch from the deprecated-but-functional Git to the newer Grit gem.

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• Using the Windows 7 Sensor and Location Platform from C#

  Windows 7 contains many exciting new features for developers and the great thing is that C# and .NET developers are no exception. One of the new features is the support for sensor devices that can be programmed effortlessly. Read on to learn about the Sensor and Location Platform in Windows 7.

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• SQL Server DMVs in Action - Sample Chapter

  Read the first chapter of this new book on DMVs. Free trial of SQL Backup™“SQL Backup was able to cut down my backup time significantly AND achieved a 90% compression at the same time!” Joe Cheng. Download a free trial now.

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• Ubuntu App Contest - Open Source Libraries

  - by Chao

  I just found out about and started looking into the Ubuntu App Contest, and I wanted to double check the contest's stance on using open source libraries built by others that are freely available on the web. I read through the rules and some of the other Q&As, and it sounds like using these libraries would not be allowed (since it could mean the app isn't built from scratch, and the library would not be in the Ubuntu archive - although I could bundle the library with the app), and I just wanted to verify this assumption. Thanks! Chao

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• Undocumented Query Plans: The ANY Aggregate

  - by Paul White

  As usual, here’s a sample table: With some sample data: And an index that will be useful shortly: There’s a complete script to create the table and add the data at the end of this post.  There’s nothing special about the table or the data (except that I wanted to have some fun with values and data types). The Task We are asked to return distinct values of col1 and col2 , together with any one value from the thing column (it doesn’t matter which) per group.  One possible result set is shown...(read more)

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• Solving “The Select operation is not supported by .. unless the SelectMethod is specified.”

  - by anas

  In most cases, You will get that error when you are using a data source control(like ObjectDataSource) without setting it’s SelectMethod as data source for the DetailsView control. If you want to display one record in the detailsView control to allow the user to edit it, then you should set the SelectMethod for the DataSource control,otherwise the detailsView control will not be able to get the record from the underlying datasource. But what if you are only using the DetailsView for only inserting...(read more)

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• How to point one sub-domain to another sub-domain and they can be used interchangeably

  - by Talon

  I'm trying to do this secure.domain2.com -loads content from- secure.domain1.com So if somebody goes to secure.domain2.com it will load the content of secure.domain1.com Note that I don't want a redirect, so if someone goes to secure.domain2.com in the address bar it will still say secure.domain2.com even though it's loading content from secure.domain1.com I've read that it's possible with a CName or something like that, what is the best way to do that?

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• Free Webinar - Using Enterprise Data Integration Dashboards

  - by andyleonard

  Join Kent Bradshaw and me as we present Using Enterprise Data Integration Dashboards Tuesday 11 Dec 2012 at 10:00 AM ET! If data is the life of the modern organization, data integration is the heart of an enterprise. Data circulation is vital. Data integration dashboards provide enterprise ETL (Extract, Transform, and Load) teams near-real-time status supported with historical performance analysis. Join Linchpins Kent Bradshaw and Andy Leonard as they demonstrate and discuss the benefits of data...(read more)

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• A little on speaking and evaluations...

  - by AaronBertrand

  Buck Woody ( blog | twitter ) just published a great post on session evaluations , and a lot of his points hit home for me. The premise is that the evaluations are not really meant for the attendee or the event organizers, but so that the speaker can get better and make the next session better. In light of this, at least in my opinion, the existing evaluation forms (and the way attendees tend to fill them out) do not achieve this at all. It may be a little more work for events to generate a more...(read more)

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• SQL Server 2008 R2 Cumulative Update 8 now available

  - by Greg Low

  CU8 is now available for SQL Server 2008 R2. You will find it here: http://support.microsoft.com/kb/2534352/en-us It includes the following fixes: VSTS bug number KB article number Description 726734 2522893 (http://support.microsoft.com/kb/2522893/ ) FIX: A backup operation on a SQL Server 2008 or SQL Server 2008 R2 database fails if you enable change tracking on this database 730658 2525665 (http://support.microsoft.com/kb/2525665/ ) FIX: SQL Server 2008 BIDS stops responding when you stop debugging...(read more)

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• Next Best Action: an emerging engagement paradigm can elevate customer experience to the next level

  - by Richard Lefebvre

  As customer interactions increase across an expanding number of communication channels, business leaders are struggling to understand and engage with each customer effectively. To address this challenge, leading organizations are adopting strategies around “next best action,” a decision-support model that systematically identifies the next best step to take in the customer conversation—whether that action is providing additional information or targeted services, presenting a unique offer, or taking no action at all... Read the complete article - by Mark A. Stevens (vice president, Insight and Customer Strategy, at Oracle) - here

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• T-SQL User-Defined Functions: the good, the bad, and the ugly (part 3)

  - by Hugo Kornelis

  I showed why T-SQL scalar user-defined functions are bad for performance in two previous posts. In this post, I will show that CLR scalar user-defined functions are bad as well (though not always quite as bad as T-SQL scalar user-defined functions). I will admit that I had not really planned to cover CLR in this series. But shortly after publishing the first part , I received an email from Adam Machanic , which basically said that I should make clear that the information in that post does not apply...(read more)

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• SQLSaturday #162 : Cambridge, England

  - by AaronBertrand

  Yesterday I presented at SQL Saturday #162 . My slide deck and samples are here: Slide Deck & Samples: Bertrand - T-SQL Bad Habits & Best Practices I also wanted to answer a question from an audience member after the session about how to generate YYYYMMDD strings to represent yesterday's date in order to append to a backup file name. In this case because we're probably not worried about performance (you're performing this calculation once), we can just use string conversion (see this blog...(read more)

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• Fetching Latitude and Longitude Co-ordinates for Addresses using PowerShell

  - by Rob Farley

  Regular readers of my blog (at sqlblog.com – please let me know if you’re reading this elsewhere) may be aware that I’ve been doing more and more with spatial data recently. With the now-available SQL Server 2008 R2 Reporting Services including maps, it’s a topic that interests many people. Interestingly though, although many people have plenty of addresses in their various databases (whether they be CRM systems, HR systems or whatever), my experience shows that many people do not store the latitude...(read more)

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• Speaking About SQL Server

  - by AllenMWhite

  There's a lot of excitement in the SQL Server world right now, with the RTM (Release to Manufacturing) release of SQL Server 2012 , and the availability of SQL Server Data Tools (SSDT) . My personal speaking schedule has exploded as well. Just this past Saturday I presented a session called Gather SQL Server Performance Data with PowerShell . There are a lot of events coming up, and I hope to see you at one or more of them. Here's a list of what's scheduled so far: First, I'll be presenting a session...(read more)

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• UPMC Picks Oracle Identity Management

  - by Naresh Persaud

  UPMC, a $10-billion integrated global health enterprise, has selected Oracle as a key technology partner in UPMC’s $100-million analytics initiative designed to help “unlock the secrets of human health and disease” by consolidating and analyzing data from 200 separate sources across UPMC’s far-flung network.As part of the project UPMC also selected Oracle Identity Management to secure the interaction and insure regulatory compliance. Read complete article here. As healthcare organizations create new services on-line to provide better care Identity Management can provide a foundation for collaboration.

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• The "Oldest Pirate" Passes

  <b>The Blog of Helios: </b>"What follows is a story about Alice I wrote in 2006, published in the now-offline Lobby4Linux.com website. I am reprinting this for those who may not have read it and to spend some personal time in remembering Alice."

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• Hardware Virtualization no longer required for Windows 7 XP Mode

  - by Jonathan Kehayias

  One of my frustrations in upgrading to Windows 7 last year was that Virtual PC no longer worked since I didn’t have Hardware Virtualization on my CPU.  This really drove my transition entirely to VMware Workstation on my personal laptop.  I recently reinstalled my work laptop (with permission) on Windows 7 Enterprise and figured I’d give XP Mode a look since this machine has Hardware Virtualization enabled.  I was surprised to find that Hardware Virtualization was no longer required,...(read more)

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