Hi Dhavan
3. OLTP Table Compression of tables with LONG and LONG RAW columns is NOT supported. Please convert LONG and LONG RAW columns to SecureFile LOBs to use compression.
Source: Oracle White Paper 'Advanced Compression with Oracle Database 11g', January 2012 http://www.oracle.com/technetwork/database/storage/advanced-compression-whitepaper-130502.pdf
source : 1436352 - Oracle 11g Advanced Compression for SAP Systems
Best Regards
Marius
