Table Compression Is Limited To 255 Columns (Doc ID 443843.1)

Last updated on SEPTEMBER 02, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.3 to 11.2.0.4 [Release 9.2 to 11.2]
Information in this document applies to any platform.
This problem can occur on any platform.
***Checked for relevance on 01-Sep-2017***

Symptoms

The following statement executed against the table for Segment Compression runs without any errors, however the table remains uncompressed :

ALTER TABLE mytable MOVE COMPRESS; 

Changes

Tables which do not get compressed have more than 255 columns.

SQL> select count(*) from dba_tab_columns where table_name='MYTABLE';

  COUNT(*)
---------- 
       280

1 row selected.

Cause

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