MySQL Character set affects varchar joins

(Doc ID 1305485.1)

Last updated on DECEMBER 31, 2014

Applies to:

MySQL Server - Version: 4.0 to 5.5 - Release: 4.0 to 5.5
Information in this document applies to any platform.

Symptoms

A query was constructed that joins across two or more tables. All of the appropriate columns appear indexed but the query still runs slowly.

Cause

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