If we create a 32 secondary indexes on table what might be the performance - response (2) by ulrich

 
Decreases performance of what?

It will definitely add space requirements and also any insert/update and delete on this table will take longer as all 32 indices might need to be maintained as well.

You should only add a secondary index in case you can proof that it supports queries accessing the table and the negative impact on table size and maintenance is justifying this (e.g. if this query runs only once a quarter it might not be worth to spend this extract money on space and maintenance, where it might be if this is a very critical query)...

But life is complicated and colorful and you will have always difficulties to divide it into black and white.