How to fix the Oracle error ORA-25189: illegal ALTER TABLE option for an index-organized table?

In this post, you’ll learn more about the Oracle ErrorORA-25189: illegal ALTER TABLE option for an index-organized table with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-25189: illegal ALTER TABLE option for an index-organized table

Reason for the Error ORA-25189: illegal ALTER TABLE option for an index-organized table

During ALTER of a index-organized table, the user attempted to enter one or more of the following options: TABLESPACE, ALLOCATE/DEALLOCATE EXTENT, PCTFREE/PCTUSED for IOT top index segment

How to fix the Error ORA-25189: illegal ALTER TABLE option for an index-organized table ?

You can fix this error in Oracle by following the below steps

Remove the illegal option(s).

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