ORA-14284

Error: ORA-14284: one or more of table's subpartitions reside in a read-only tablespace

Causa: User issued ALTER TABLE statement attempting to modify an existing VARCHAR2 (or VARCHAR) column to be of type CHAR (or CHARACTER), increase length of an existing CHAR (or CHARACTER) column, or add a column with user-specified default for a table one or more subpartitions of which reside in read-only tablespaces, which is illegal.

Acción: Avoid performing aforementioned operations on a partitioned table one or more subpartitions of which reside in read-only tablespaces.