1)The big string ,i mean the string is large enough,about 8-10k

This doesn’t strike me as "big".

2)I use the SqlServer ( varchar(max) ) to store the string.

SQLServer should have not trouble handling those strings.

3)I just compress common string ,eg.:...

Any of the suggested compression alternatives should work for you. Based on the example you provide I assume that you will obtain excellent compression ratios.

I would like to draw your attention to one more alternative: RLE which stands for Run Length Encoding. It doesn’t give you a great compression ration but it’s very simple and therefore fast. I have found a Perl implementation for it which can be found here (I did not tested it though)

In reply to Re^3: How to "zip" a big string to small ? by dHarry
in thread How to "zip" a big string to small ? by pysome

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