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Sorry all,
I do have this mini table with 3 columns but, I will list the values either by one or other column.
1) Is it ok to have two of those columns with indexes?
2) Should we have only one index per table?
3) At the limit, if we have a table with 100 columns for example, and we have 50 of them with indexes, is this ok?
Thanks,
MEM
It’s fine to have many indexes, even multiple indexes on one table, as long as you are using them.
Run EXPLAIN on your queries and check which indexes are being used. If there are indexes that are not being used by any queries then they aren’t giving you any benefit and are just slowing down modifications to the table. These unused indexes should be removed.
You may also want to consider multiple-column indexes if you have not already done so.