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I found my answer here. Quick answer is - they need to be the same collation/encoding to use an index. https://stackoverflow.com/questions/2266241/utf-8-vs-latin1-mysql-indexes-not-used-on-utf-8 …
answered Jul 19 '18 by amaurer
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Does table/column character encoding have any impact on how the MySQL optimizer chooses join indexes? I have a table that have the same columns and indexes on two servers, one server does a eq_ref … under type and the other does ALL Only difference I see is the character encoding. Could that be the cause query not using an index? In the database that isn't performing, one table is latin1 and the …
asked Jul 19 '18 by amaurer