V$IM_COLUMN

8.1 V$IM_COLUMN_LEVEL

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.

Column	Datatype	Description
`INST_ID`	`NUMBER`	Instance ID
`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. Possible values: `DEFAULT`: This value appears for physical columns of a table that do not have a selective column clause. It also appears when a virtual column has been explicitly enabled for in-memory storage using `ALTER TABLE` table-name `INMEMORY(VC)`. `UNSPECIFIED`: This value appears for virtual columns of a table that do not have a selective column clause. If the `INMEMORY_VIRTUAL_COLUMNS` initialization parameter is set to `MANUAL`, a virtual column with a `DEFAULT INMEMORY_COMPRESSION` clause will be materialized while a virtual column with an `UNSPECIFIED` value will not be.
`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

Note:

The SYS_IME hidden virtual columns automatically added by the In-Memory Expression (IME) infrastructure will not be shown in this view.