code 128 checksum c# What is the overhead in C#.NET

Creation USS Code 128 in C#.NET What is the overhead

What is the overhead
Paint Code 128 Code Set A In C#.NET
Using Barcode encoder for .NET Control to generate, create USS Code 128 image in .NET applications.
www.OnBarcode.com
Recognize Code 128A In Visual C#.NET
Using Barcode decoder for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
There is no such thing as free lunch. As you may expect, the fragments_persons table incurs overhead. To start with, run these commands:
Making UPC-A Supplement 5 In Visual C#.NET
Using Barcode drawer for VS .NET Control to generate, create Universal Product Code version A image in Visual Studio .NET applications.
www.OnBarcode.com
Matrix Creation In Visual C#
Using Barcode creator for Visual Studio .NET Control to generate, create Matrix image in .NET applications.
www.OnBarcode.com
EXEC sp_spaceused persons EXEC sp_spaceused fragments_persons
QR Generator In C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR image in VS .NET applications.
www.OnBarcode.com
Generating ANSI/AIM Code 39 In C#
Using Barcode encoder for .NET Control to generate, create Code-39 image in .NET framework applications.
www.OnBarcode.com
The reserved space for the persons table is 187 MB, whereas the fragments_persons table takes up 375 MB twice the size of the base table. What about the overhead for updates The file 07_trigger_volume_test.sql includes a stored procedure called volume_update_sp that measures the time to insert, update, and delete 20,000 rows in the persons table. You can run the procedure with the trigger enabled or disabled. I ran it this way:
1D Generator In C#
Using Barcode creation for .NET framework Control to generate, create Linear Barcode image in .NET applications.
www.OnBarcode.com
Code 93 Full ASCII Maker In C#
Using Barcode printer for Visual Studio .NET Control to generate, create Code 93 image in .NET framework applications.
www.OnBarcode.com
EXEC volume_update_sp NULL EXEC volume_update_sp 'map' -- No trigger enabled. -- Trigger for fragments_persons enabled.
USS Code 128 Generation In None
Using Barcode printer for Font Control to generate, create Code128 image in Font applications.
www.OnBarcode.com
Code128 Generation In Java
Using Barcode encoder for Java Control to generate, create USS Code 128 image in Java applications.
www.OnBarcode.com
Fragments and lists
Decode Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Generate Barcode In .NET
Using Barcode creation for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
I got this output:
PDF-417 2d Barcode Creator In None
Using Barcode encoder for Microsoft Word Control to generate, create PDF-417 2d barcode image in Office Word applications.
www.OnBarcode.com
2D Creation In Java
Using Barcode maker for Java Control to generate, create Matrix Barcode image in Java applications.
www.OnBarcode.com
SQL 2005 INSERT took UPDATE took DELETE took INSERT took UPDATE took DELETE took 1773 ms. 1356 ms. 826 ms. 40860 ms. 32073 ms. 30123 ms. SQL 2008 INSERT took UPDATE took DELETE took INSERT took UPDATE took DELETE took 700 ms. 1393 ms. 610 ms. 22873 ms. 35180 ms. 28690 ms.
Create UCC - 12 In Visual Basic .NET
Using Barcode maker for .NET framework Control to generate, create GTIN - 12 image in .NET applications.
www.OnBarcode.com
Encoding ECC200 In VB.NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix image in .NET applications.
www.OnBarcode.com
The overhead for the fragments_persons table is considerable, both in terms of space and update resources, far more than for a regular SQL Server index. For a table that holds persons, products, and similar base data, this overhead can still be acceptable, as such tables are typically moderate in size and not updated frequently. But you should think twice before you implement something like this on a busy transactional table.
Barcode Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Create QR-Code In None
Using Barcode creation for Online Control to generate, create QR Code image in Online applications.
www.OnBarcode.com
Fragments and lists
Printing Barcode In Visual Basic .NET
Using Barcode maker for .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Barcode Creation In Java
Using Barcode drawer for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
The fragments_persons table takes up so much space because we store the same fragment many times. Could we avoid this by storing a fragment only once Yes. Consider what we have in the following snippet:
fragment -------aam aam aam aan aan person_id --------19673 19707 43131 83500 192379
If we only wanted to save space, we could just as well store this as follows:
fragment -------aam aan person_ids ----------------19673,19707,43131 83500,192379
Most likely, the reader at this point gets a certain feeling of unease, and starts to ask all sorts of questions in disbelief, such as Doesn t this violate first normal form How do we build these lists in the first place And how would we use them efficiently How do we maintain these lists Aren t deletions going to be very painful Aren t comma-separated lists going to take up space as well These questions are all valid, and I will cover them in the following sections. In the end you will find that this outline leads to a solution in which you can implement efficient wildcard searches with considerably less space than the fragments_persons table requires. There is no denial that this violates first normal form and an even more fundamental principle in relational databases: no repeating groups. But keep in mind that, although
Build your own index
we store these lists in something SQL Server calls a table, logically this is an index helping us to make things go faster. There is no data integrity at stake here.
Building the lists
Comma-separated lists would take up space, as we would have to convert the id:s to strings. This was only a conceptual illustration. It is better to store a list of integer values by putting them in a varbinary(MAX) column. Each integer value then takes up four bytes, just as in the fragments_persons table. To build such a list you need a user-defined aggregate (UDA), a capability that was added in SQL 2005. You cannot write a UDA in T-SQL, but you must implement it in a CLR language such as C#. In SQL 2005, a UDA cannot return more than 8,000 bytes, a restriction that was removed in SQL 2008. Thankfully, in practice this restriction is insignificant, as we can work with the data in batches. In the download archive you can find the files integerlist-2005.cs and integerlist2008.cs with the code for the UDA, as well as the compiled assemblies. The assemblies were loaded by 01_build_database.sql, so all you need to do at this point is to define the UDA as follows:
Copyright © OnBarcode.com . All rights reserved.