Correlated SubQuery needs Tuning.. INDEX and LENGTH functions causing problem... - response (1) by dnoeth

PS: I can’t use Cross join !!

Well, you don't call it a Cross Join, but it is a cross join, when you explain it you'll see a PRODUCT join.
No matter how you rewrite it using a Correlated Subquery or a Cross Join or LIKE instead of INDEX/LENGTH.
 
The only tuning will be a properly normalized REF_TABLE.
 
Dieter