Is there a MySQL performance benchmark to measure the impact of utf8_unicode_ci versus utf8_general_ci?

Posted by MiniQuark on Server Fault See other posts from Server Fault or by MiniQuark
Published on 2010-07-05T10:05:05Z Indexed on 2010/12/27 23:56 UTC
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Filed under:

mysql

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database-performance

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collation

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unicode

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utf8

I read here and there that using the utf8_unicode_ci collation ensures a better treatment of unicode text (for example, it knowns how to expand characters such as 'œ' into 'oe' for searching and ordering) compared to the default utf8_general_ci which basically just strips diacritics. Unfortunately, both sources indicate that utf8_unicode_ci is slightly slower than utf8_general_ci.

So my question is: what does "slightly slower" mean? Has anyone run benchmarks? Are we talking about a -0.01% performance impact or rather something like -25%?

Thanks for your help.

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