code 128 checksum c# INSERT took 77203 ms. UPDATE took 151096 ms. DELETE took 76846 ms. in Visual C#.NET

Generator Code 128 Code Set A in Visual C#.NET INSERT took 77203 ms. UPDATE took 151096 ms. DELETE took 76846 ms.

INSERT took 77203 ms. UPDATE took 151096 ms. DELETE took 76846 ms.
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It s clear that using the big bitmask in my implementation is not a viable solution. One problem is that 561 charindex calls are far too many. The char_bitmask function could be implemented more efficiently, and I would at least expect the CLR to offer a few possibilities. The other problem is that as the mask grows, so does the index. Because the method works by scanning part of the index, this has a direct effect on the performance. You would need to find a more efficient storage format for the bitmask to overcome this.
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You ve now seen two ways to use fragments, and you ve seen that both approaches can help you considerably in speeding up searches with the LIKE operator. You have also seen how bitmasks can be used to create a less intrusive, but lower performance, solution. My use case was searching on email addresses which by nature are fairly short. Fragments may be less appropriate if your corpus is a column with free text that can be several hundred characters long. The fragments table would grow excessively large, even if you used the list technique.
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You can take a few precautions, however. You could filter out spaces and punctuation characters when you extract the fragments. For instance, in the email example, we could change the wordfragments function so that it does not return fragments with the period (.) and at (@) characters. You could achieve a more drastic space reduction by setting an upper limit to how many matches you save for a fragment. When you have reached this limit, you don t save any more mappings. You could even take the brutal step to throw those matches away, and if a user enters a search string with only such fragments, you tell him that he must refine his search criteria. In contrast, the space overhead of the bitmask solution is independent of the size of the column you track. Thus, it could serve better for longer columns. I see a potential problem, though: as strings get longer, more and more characters appear in the string and most bitmask values will be in the high end. Then again, Sylvain originally developed this for a varchar(255) column, and was satisfied with the outcome. In any case, if you opt to implement any of these techniques in your application, you will probably be able think of more tricks and tweaks. What you have seen here is only the beginning.
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Erland Sommarskog is an independent consultant based in Stockholm, Sweden. He started to work with relational databases in 1987. He first came in contact with SQL Server in 1991, even if it said Sybase on the boxes in those days. When he changed jobs in 1996 he moved over to the Microsoft side of things and has stayed there. He was first awarded MVP in 2001. You can frequently see him answer SQL Server questions on the newsgroups. He also has a web site, www.sommarskog.se, where he has published a couple of longer articles and some SQL Server related utilities.
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18 Getting and staying connected or not
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It seems that I spend quite a bit of my time answering questions from family, friends and neighbors who want to know how to resurrect their computers, or from developers who need to figure out how to get around some seemingly impossibly complex problem. Thankfully, not all of their problems are that complex. I expect that many of you are confronted by many of the same queries from those that look up to you as a technical resource like the doctor who lives up the street who listens patiently while you describe that pain in your right knee. A couple of the most common questions I get on the public Network News Transfer Protocol (NNTP) newsgroups (such as Microsoft.public.dotnetframework.adonet and ..sqlserver.connect1), are How do I get connected and Should I stay connected This chapter attempts to explain how the SQL Server connection mechanism works and how to create an application that not only can connect to SQL Server in its various manifestations but stays connected when it needs to. I don t have room here to provide all of the nuances, but I hope I can give you enough information to solve some of the most common connection problems and, more importantly, help you design your applications with best-practice connection management built in.
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