TechEd Bloggers Database Platform

Sorting out Reactive Framework

Jim Wooley — Wed, 28 Jul 2010 16:26:54 GMT

Jim Wooley writes, "When I started looking at the Reactive Framework, one of the first things I did was to try creating some of the same standard LINQ queries that I’ve used against LINQ to Objects...If you try this where Sensor is an IObservable rather than IEnumerable, you will find that the Order By clause generates the following compiler error in VB..." more

Wed, 28 Jul 2010 16:26:54 GMT

Resolution to Percentage Change in DB% Used Space

Cameron Fuller — Thu, 22 Jul 2010 19:32:14 GMT

Cameron Fuller writes, "...This alert is raised when significant changes in the percentage of the space used in a database has changed quickly...Create an override to change..." more

Thu, 22 Jul 2010 19:32:14 GMT

PREEMPTIVE Bug in SQL Server 2008

PSS SQL Engineers — Wed, 21 Jul 2010 18:33:32 GMT

PSS SQL Engineers writes, "There is a bug in SQL Server 2008 that causes PREEMPTIVE_OS_GETPROCADDRESS to include and accumulate the execution time of the extended stored procedure (XPROC). The following is an example showing the increase in the GetProcAddress wait time..." more

Wed, 21 Jul 2010 18:33:32 GMT

What I'm Loving About the Newest Iteration of EF Code First in CTP4

Julie Lerman — Fri, 16 Jul 2010 17:53:11 GMT

Julie Lerman writes, "There have been a lot of improvements to code first since CTP3 and in fact, the team has been experimenting with changes to the core Entity Framework APIs that not only support even simpler programming with code first but that we’ll benefit from in an upcoming release of .NET...I went to town on the CTP3 sample..." more

Fri, 16 Jul 2010 17:53:11 GMT

Side-By-Side SQL Installations - What Gets Changed?

Buck Woody — Thu, 15 Jul 2010 18:12:07 GMT

Buck Woody writes, "I was asked yesterday if it was “OK” to install SQL Server 2008 R2 on a system that already had SQL Server 2008, but without upgrading....they wanted to keep both versions of SQL Server running at the different levels. That’s supported; and it’s called a “side-by-side” installation. that means..." more

Thu, 15 Jul 2010 18:12:07 GMT

Code Sample Creating a Collection from Singletons and Collections Using LINQ

Eric White — Thu, 15 Jul 2010 18:02:24 GMT

Eric White writes, "...When constructing an object there are times that you may have one or more singletons, and one or more collections that will comprise the child objects of the object you are constructing....using LINQ to write a recursive-descent parser for SpreadsheetML formulas..." more

Thu, 15 Jul 2010 18:02:24 GMT

How to Update SQL Records in a Database Table With Data From Another Table

Scott Mitchell — Tue, 13 Jul 2010 20:07:42 GMT

Scott Mitchell writes, "...what if you need to update values in one database table from values in another database table? There are a couple ways this can be done. One way is to use a subquery:...Alternatively, you can use a JOIN statement in your UPDATE clause. The precise syntax seems to vary a bit based on the database system. For Microsoft SQL Server, use the following syntax:..." more

Tue, 13 Jul 2010 20:07:42 GMT

Examples of Recursive Descent Parsers: How They Work

Eric White — Tue, 13 Jul 2010 19:11:49 GMT

Eric White writes, "...using LINQ to write a recursive-descent parser for SpreadsheetML formulas...In these expressions, operands are floating point numbers, but for simplicity, I’ve eliminated the ability to have exponents...There are five binary (sometimes called infix) operators. Operator precedence needs to be honored when parsing formulas..." more

Tue, 13 Jul 2010 19:11:49 GMT

Sampling can Produce Inaccurate Stats with Unevenly Distributed Data

PSS SQL Engineers — Sat, 10 Jul 2010 00:02:54 GMT

PSS SQL Engineers writes, "...The reason is that the data is not evenly distributed. If the data is truly evenly distributed, 10% sampling and 100% sampling will produce similar results...the more frequent values will have higher chance of being selected to compute statistics. At final stage...t’s the solution? There are a couple of things..." more

Sat, 10 Jul 2010 00:02:54 GMT

SQL Best Practices Analyzer vs Policy Based Management

Buck Woody — Thu, 08 Jul 2010 21:03:40 GMT

Buck Woody writes, "...what the difference is between the BPA and Policy Based Management (PBM) that was introduced in SQL Server 2008. While it’s true both of these tools can do similar things, each has strengths and weaknesses. The Best Practices Analyzer has..." more

Thu, 08 Jul 2010 21:03:40 GMT

Creating Models from Databases with 100s of Tables

Julie Lerman — Thu, 08 Jul 2010 20:57:33 GMT

Julie Lerman writes, "...Here’s an untouched model built from all of the tables and view of the AdventureWorks database – totalling about 95 entities. This is already unmanageable and causes design time performance issues, and it’s not even 100 entities..." more

Thu, 08 Jul 2010 20:57:33 GMT

SSRS 2008 R2 Performance Test Results

PSS SQL Engineers — Tue, 06 Jul 2010 19:32:30 GMT

PSS SQL Engineers writes, "...Here is the updated code:...even though I would love to see some improvement in this area, my own testing shows that SSRS 2008 R2 starts up from a cold start in about half the time is took SSRS 2005..." more

Tue, 06 Jul 2010 19:32:30 GMT

Notes Clients do not Allow Two Windows Accounts to Log on

Stephen Walch — Tue, 06 Jul 2010 19:16:11 GMT

Stephen Walch writes, "...you cannot have two processes that access the same local Notes resources unless they are ALL running as Administrator or NONE of them are running as Administrator. This includes...any other Notes add-on products. This problem gets worse when you realize that in Windows 7 and Windows 2008..." more

Tue, 06 Jul 2010 19:16:11 GMT

Dividing by Zero in Report Builder: Creating a Fraction as a Calculated Field

Ella Maschiach — Tue, 06 Jul 2010 17:54:27 GMT

Ella Maschiach writes, "...A user complained a report in report builder didn't run for her, as she divided two measures and the report would error when the denominator would equal zero...So let's assume you have two measures: A and B and you need a new measure of A/B. Only thing is, B can sometimes be equal to zero..." more

Tue, 06 Jul 2010 17:54:27 GMT

Signature of a Range Operator in Linq

Jalpesh P. Vadgama — Tue, 22 Jun 2010 19:50:17 GMT

Jalpesh P. Vadgama writes, "...great operator called range operator which will return a sequence of integer number from start point to number of count. Here is the signature of range operator in Linq..." more

Tue, 22 Jun 2010 19:50:17 GMT

Code Sample Union, Except and Intersect Operator in Linq

Jalpesh P. Vadgama — Mon, 21 Jun 2010 22:53:26 GMT

Jalpesh P. Vadgama writes, "While developing a windows service using Linq-To-SQL i was in need of something that will intersect the two list and return a list with the result...found three great use full operators in Linq...simple console application as a example where i have used two string array and applied the three operator one by one and print the result using Console.Writeline. Here is the code for that." more

Mon, 21 Jun 2010 22:53:26 GMT

Installing SQL 2008 R2 BPA Issues Relating to Remoting

PSS SQL Engineers — Mon, 21 Jun 2010 22:32:30 GMT

PSS SQL Engineers writes, "After getting through the Pre-Reqs for BPA (PowerShell 2.0, MBCA, .NET Framework), you may hit one of two scenarios when installing BPA. In all of the cases of an install failure, you will see the following error:..." more

Mon, 21 Jun 2010 22:32:30 GMT

Using LINQ to Select the Largest Available Webcam Resolution

Pete Brown — Tue, 15 Jun 2010 21:14:38 GMT

Pete Brown writes, "...Sometimes in Silverlight, you just want to get the largest possible webcam resolution. This snippet shows how to obtain that using LINQ...Here's the screen shot..." more

Tue, 15 Jun 2010 21:14:38 GMT

Where did the SQL Server Instance Disappear?

PSS SQL Engineers — Mon, 14 Jun 2010 22:37:47 GMT

PSS SQL Engineers writes, "..Even though this event log entry did not have direct correlation to the setup attempts or timing, it gave a vital clue. Something was wrong with the WMI infrastructure on this machine. We know that setup uses WMI heavily to perform..." more

Mon, 14 Jun 2010 22:37:47 GMT

TechEd 2010 Demos and Scripts for SQL Sessions

Allen White — Mon, 14 Jun 2010 16:08:23 GMT

Allen White writes, "...sessions at Tech Ed NA in New Orleans...Here are the sessions I presented:...Administrative Demo-Fest for SQL Server 2008 [and]...Gather SQL Server Performance Data with PowerShell...I've attached the scripts I used for the demos. Please feel free to use these, and enhance them with your own needs, but..." more

Mon, 14 Jun 2010 16:08:23 GMT