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But after setting up a simulation (I am very much into simulations, testing, and experimenting), we were able to prove that it was the correct approach There were two ways to approach the indexing of this particular column: Just create an index on the processed flag column Create an index only on the processed flag column when the processed flag is N that is, only index the values of interest Typically, we do not want to use an index where the processed flag is Y, since the vast majority of the records in the table would have the value Y Notice that I did not say We never want to use if you need to frequently count the number of processed records for some reason, then an index on the processed records may well prove useful..

SmartDate implements the IComparable interface, which defines a CompareTo() method. The CompareTo() method is used by the .NET Framework in various ways, most notably to support sorting within sorted collections and lists. This CompareTo() method is overloaded to also include a strongly typed CompareTo() that directly accepts a SmartDate: Public Function CompareTo(ByVal obj As Object) As Integer _ Implements IComparable.CompareTo If TypeOf obj Is SmartDate Then Return CompareTo(DirectCast(obj, SmartDate)) Else Throw New ArgumentException(My.Resources.ValueNotSmartDateException) End If End Function Public Function CompareTo(ByVal value As SmartDate) As Integer If Me.IsEmpty AndAlso value.IsEmpty Then Return 0 Else Return Me.Date.CompareTo(value.Date) End If End Function Because empty dates are maintained as DateTime.MinValue or DateTime.MaxValue, they will automatically sort to the top or bottom of the list based on the setting of mEmptyIsMax. For ease of use, SmartDate also includes similar CompareTo() overloads that accept String and DateTime.

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A subnet is a part of the overall address space. A subnet mask indicates to which subnet a device belongs. A common subnet mask is 255.255.255.0, which indicates that the last byte of an IP address contains host information. You can obtain the actual subnet mask as a string with the read-only SubnetMask property. You can set the subnet mask explicitly with the EnableStaticIP method.

We ended up creating a very small index on just the records where the processed flag was N, which provided quick access to the records of interest Was that the end of the story No, not at all The developers still had a less than optimal solution on their hands We fixed their major problem, caused by their not fully understanding the tools they were using, and found only after lots of study that the system was not nicely instrumented We didn t yet address the following issues: The application was built without a single consideration for scalability Scalability is something you have to design for The application itself could not be tuned or touched Experience has shown that 80 to 90 percent of all tuning is done at the application level, not at the database level.

The application was performing functionality (the queue table) that the database already supplied in a highly concurrent and scalable fashion I m referring to the Advanced Queuing (AQ) software that is burned into the database, functionality they were trying to reinvent The developers had no idea what the beans did in the database or where to look for potential problems That was hardly the end of the problems on this project We then had to figure out How to tune SQL without changing the SQL Oracle 10g actually does permit us to accomplish this magical feat for the first time to a large degree How to measure performance How to see where the bottlenecks are How and what to index And so on.

SmartDate should provide arithmetic manipulation of the date value. Since the goal is to emulate a regular DateTime data type, it should provide at least Add() and Subtract() methods:

At the end of the week, the developers, who had been insulated from the database, were amazed at what the database could actually provide for them, how easy it was to get that information and, most important, how big a difference it could make to the performance of their application In the end they were successful just behind schedule by a couple of weeks This example is not meant to be a criticism of tools or technologies like EJBs and container-managed persistence Rather, it is a criticism of purposely remaining ignorant of the database, how it works, and how to use it The technologies used in this case worked well after the developers gained some insight into the database itself The bottom line is that the database is typically the cornerstone of your application If it does not work well, nothing else really matters.

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