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Linguistic Index Performance Problem

in SQL Performance (MOSC) 3 commentsAnswered ✓

Oracle Database Version - 19.17.0.0.0

Os version - linux 8.8

We are facing performance issues with many sqls which is going for full table scan due to the fact of having function based index (nls_sort)(linguistic index)for which we tried to change the session parameter (nls_sort,nls_comp) to take advantage of index whereas it worked but sort group by and filter takes much time and burning more cpu and spending lots of time compare to full table scan. Can we control it using hint ? Or what is the disadvantage of having linguistic index. Will attach the execution plan

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