SAP Knowledge Base Article - Preview

2215761 - Error ORA-22858 modifying column data type to CLOB - SAP PowerDesigner


  • Data type of an Oracle table column is modified to CLOB.
  • PowerDesigner generates an ALTER TABLE table_name MODIFY column_name statement.
  • Executing the script generated by PowerDesigner leads to error "ORA-22858 - invalid alteration of datatype".
  • The alter.sql file must drop then create the table again.



  • SAP PowerDesigner 16.5
  • Oracle DBMS


SAP PowerDesigner 16.5


table, Oracle, blob, clob, lob, drop, create, alter, change  , KBA , BC-SYB-PD , PowerDesigner , Bug Filed

About this page

This is a preview of a SAP Knowledge Base Article. Click more to access the full version on SAP ONE Support launchpad (Login required).

Search for additional results

Visit SAP Support Portal's SAP Notes and KBA Search.