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Re: two column int index not used correctly
Posted by: Jørgen Løland
Date: June 17, 2011 01:34AM

Hi Ming,

Thinking of it, there is actually a possibility for MySQL to consider range access also in non-constant cases. Take a look here: (See "Range checked for each record")

Can you modify case 3) like this and report back with the results?

FROM web_query.web_query_ip_dest_analysis_20110616171614564_merged AS A
    JOIN ip_range_table FORCE INDEX (idx_start_ip) ON A.ip>=ip_range_table.start_ip;

("LEFT" was removed)

Hope this helps,
Jørgen Løland
Software Engineer, MySQL, Oracle

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