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I am using PhpMyAdmin to add indexes on the tables but whenever i try to add one it prints errors…
I have a table called updates_categories and i have a column named created_date… so i tried to add an index there and i get the following error:
#1062 - Duplicate entry '2012-02-27 22:15:16' for key 'date_index'
i suppose that many entries have entered the same date(this can happen) but what does that mean?That i cant have an index on columns with same data?
Do not add an index for only one field becouse most of the time it has no performance benefit on select but they got disadvantages on inserts. What is your table structure and what kind of queries are you using against it?