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Alter Table Add Column Results In ORA-39726 Unsupported Operation On Compressed Table (Doc ID 2167255.1)

Last updated on AUGUST 17, 2020

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.


The following sequence of commands succeeds in and fails in

create table jba
(c1 number not null, c2 number not null) compress for oltp;
alter table jba nocompress;
alter table jba add c3 number default 99 not null;

Issue is discussed in length in MOS note: (Doc ID 1288918.1). The workaround
given in that note works in but does not work in 12C.




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