You can import database objects that are enabled for the IM column store using the TRANSFORM=INMEMORY:y option of the ‘impdp’ command. With this option, Data Pump keeps the IM column store clause for all objects that have one. When the TRANSFORM=INMEMORY:n option is specified, Data Pump drops the IM column store clause from all objects that have one.
You can also use the TRANSFORM=INMEMORY_CLAUSE:string option to override the IM column store clause for a database object in the dump file during import. For example, you can use this option to change the IM column store compression for a database object being imported.
transform=inmemory_clause:\”INMEMORY MEMCOMPRESS FOR DML PRIORITY CRITICAL\”
Note the \ characters are necessary to “escape” the double quotes so they are not stripped by the OS.
Oracle Database In-Memory Option (DBIM) Basics and Interaction with Data Warehousing Features (Doc ID 1903683.1)