troubleshooting Question

Mysql select .. how to chose index

Avatar of RGuillermo
RGuillermoFlag for United States of America asked on
MySQL Server
1 Comment1 Solution10 ViewsLast Modified:
Hello Experts,
I have a table with 140 thousand records
and a simple select like:

SELECT * FROM TBL_TRE_CO2 WHERE PAT_COD =12728

field pat_cod is the second index (not automatic increment which is the first index)

takes 5 seconds which is too much for each query
then I executed EXPLAIN  showing there is "no possible keys", and "  No keys"

how can I force the select to use a certain index?

Best regards,


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