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Oracle® Database Reference
12c Release 1 (12.1)

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V$IM_COLUMN_LEVEL presents the selective column compression levels that are defined using the inmemory_memcompress clause of the inmemory_column_clause of the CREATE TABLE statement. This view returns no rows for a table which has no associated selective column compression levels. For each column of a table that is associated with selective column compression levels, this view presents the associated compression level of the column, if any, or the string DEFAULT if no compression level has been defined for the column.

Column Datatype Description
OWNER VARCHAR2(31) Username of the table owner
OBJ_NUM NUMBER Table object number
TABLE_NAME VARCHAR2(31) Table name
SEGMENT_COLUMN_ID NUMBER Segment column number
COLUMN_NAME VARCHAR2(31) Column name
INMEMORY_COMPRESSION VARCHAR2(26) Column compression level
CON_ID NUMBER The ID of the container to which the data pertains. Possible values include:
  • 0: This value is used for rows containing data that pertain to the entire multitenant container database (CDB). This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data


This view is available starting with Oracle Database 12c Release 1 (

See Also: