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Does index unusable drops the storage segment?

Answer 10g No, 11gR2 Yes

10g:-

SQL> select * from v$version;

BANNER ——————————————————- Oracle Database 11g Release 10.2.0.5.0 – Production PL/SQL Release 10.2.0.5.0 – Production CORE    10.2.0.5.0      Production TNS for 32-bit Windows: Version 10.2.0.5.0 – Production NLSRTL Version 10.2.0.5.0 – Production

SQL> create table test as select rownum id, ‘TEST’ name from […]