| ERROR | unsupported add/drop column operation on compressed tables |
| CAUSE | An unsupported add/drop column operation for compressed table was attemped. |
| ACTION | When adding a column, do not specify a default value. DROP column is only supported in the form of SET UNUSED column (meta-data drop column). |
| 2287504 | Oracle Database Error ORA-39726 WHEN ADDING OR DROPPING A COLUMN in Oracle 12.1.0.2 after uncompressing a table or partition |
| 2166836 | Oracle 12c: Problem during SAP upgrade with compressed tables |
| 2157904 | Oracle 12c: Conversion of compressed tables |
| 2086029 | Oracle 12c: Additional Info / Corrections to Oracle 12c (12.1.0.2) Upgrade |
| 2254866 | Using Oracle Database 12c Automatic Data Optimization with SAP NetWeaver |