V$IM_USER_SEGMENTS

V$IM_USER_SEGMENTS presents information about the in-memory segments for the current user in the database.

Only segments that have an in-memory representation are displayed. If a segment is marked for the In-Memory Column Store (IM column store) but is not populated, no corresponding row for that segment is displayed in this view.

Column Datatype Description

SEGMENT_NAME

VARCHAR2(128)

Name of the segment, if any

PARTITION_NAME

VARCHAR2(128)

Object partition name (set to NULL for non-partitioned objects)

SEGMENT_TYPE

VARCHAR2(18)

Type of segment:

  • TABLE

  • TABLE PARTITION

  • TABLE SUBPARTION

TABLESPACE_NAME

VARCHAR2(30)

Name of the tablespace containing the segment

INMEMORY_SIZE

NUMBER

Size of the in-memory version of the segment, in bytes

BYTES

NUMBER

Total size of the on-disk segment, in bytes

BYTES_NOT_POPULATED

NUMBER

Size of the portion of the on-disk segment that is not populated in memory, in bytes

POPULATE_STATUS

VARCHAR2(9)

Status of segment population:

  • STARTED

  • COMPLETED

  • FAILED

INMEMORY_PRIORITY

VARCHAR2(8)

Indicates the priority for IM column store population:

  • LOW

  • MEDIUM

  • HIGH

  • CRITICAL

  • NONE

INMEMORY_DISTRIBUTE

VARCHAR2(15)

Indicates how the IM column store is distributed in an Oracle Real Application Clusters (Oracle RAC) environment:

  • AUTO

  • BY ROWID RANGE

  • BY PARTITION

  • BY SUBPARTITION

INMEMORY_DUPLICATE

VARCHAR2(13)

Indicates the duplicate setting for the IM column store in an Oracle RAC environment:

  • NO DUPLICATE

  • DUPLICATE

  • DUPLICATE ALL

INMEMORY_COMPRESSION

VARCHAR2(17)

Compression level for the IM column store:

  • NO MEMCOMPRESS

  • FOR DML

  • FOR QUERY [ LOW | HIGH ]

  • FOR CAPACITY [ LOW | HIGH ]

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:

This view is available starting with Oracle Database 12c Release 1 (12.1.0.2).

See Also: