Best technique to search for matching substrings with Linq & SQL Server -


I need to find rows in the table with 200,000 entries. Some people can not think of this 'big' , But enough to tell performance ideas.

In the table, strings are only digits, for example, the user can enter something like '12340-0560-78', or some fraction of it, e.g. '0560', and I need to match prices

12345678 and 123405678 and 0123456780 etc.

These NDCs are national drug codes, and in spite of the standard manufacturers have given them their By adding or subtracting zero in different positions in barcode, in different ways.

I remove the zero and non-numeric characters from the search string and work on the column after removing all its zeroes. It is very slow.

So I added a calculation column to the table, in which the Search column contains all the zeros. It's better, but I'm still scanning a table due to joining.

Then I prepared a full text index, but I realized that with full text index I can not search for substring, only words, phrases and prefixes are weird, but this is the solution to this problem does not do.

What are the other options?

How about creating a simple cluster index on the calculated column? What is the right thing to do?

For example 

  Make Table [DBO]. [FU] ([code] [vaachar] (20) tap, [cocal] AS (replace [[code], '-', '', '', '')) [primary]

and 

  change CLUSTERED INDEX [IX_foo] ON [dbo]. [Foo] ([ccol] ASC) ...

Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more

Debug on symbian -

I am using trk for phone debug This works well for the Holorld project But when I start the project in phone debug mode 1) the load failed 2) TrkProtocolPlugin: to target the specified file Failure (please verify If any body understands what problem I am experiencing, then this problem helps me Pre-release If the application has the privileges assigned (with the appropriate certificate) itemprop = "text" > In your case, I will check: / li> If there is no conflict of application ID with any other application of device If there are problematic commands in the installation package (for example copy copy for non-accessible directories)
Read more