ALL_TAB_SUBPARTITIONS

ALL_TAB_SUBPARTITIONS displays, for each table subpartition accessible to the current user, the subpartition name, name of the table and partition to which it belongs, its storage attributes, and statistics generated by the DBMS_STATS package.

Column Datatype NULL Description
TABLE_OWNER VARCHAR2(128) NOT NULL Owner of the table
TABLE_NAME VARCHAR2(128) NOT NULL Name of the table
PARTITION_NAME VARCHAR2(128)   Name of the partition
SUBPARTITION_NAME VARCHAR2(128)   Name of the subpartition
HIGH_VALUE LONG   Subpartition bound value expression
HIGH_VALUE_LENGTH NUMBER NOT NULL Length of the subpartition bound value expression
PARTITION_POSITION NUMBER   Position of the partition within the table
SUBPARTITION_POSITION NUMBER   Position of the subpartition within the partition
TABLESPACE_NAME VARCHAR2(30) NOT NULL Name of the tablespace containing the subpartition
PCT_FREE NUMBER NOT NULL Minimum percentage of free space in a block
PCT_USED NUMBER   Minimum percentage of used space in a block
INI_TRANS NUMBER NOT NULL Initial number of transactions
MAX_TRANS NUMBER NOT NULL Maximum number of transactions
INITIAL_EXTENT NUMBER   Size of the initial extent in bytes (for a range partition); size of the initial extent in blocks (for a composite partition)
NEXT_EXTENT NUMBER   Size of secondary extents in bytes (for a range partition); size of secondary extents in blocks (for a composite partition)
MIN_EXTENT NUMBER   Minimum number of extents allowed in the segment
MAX_EXTENT NUMBER   Maximum number of extents allowed in the segment
MAX_SIZE NUMBER   Maximum number of blocks allowed in the segment
PCT_INCREASE NUMBER   Percentage increase in extent size
FREELISTS NUMBER   Number of freelist groups allocated in this segment
FREELIST_GROUPS NUMBER   Number of freelist groups allocated in this segment
LOGGING VARCHAR2(3)  

Indicates whether or not changes to the table are logged:

  • YES

  • NO
COMPRESSION VARCHAR2(8)   Indicates whether this subpartition is compressed (ENABLED) or not (DISABLED)
COMPRESS_FOR VARCHAR2(30)  

Default compression for what kind of operations:

  • BASIC

  • ADVANCED

  • QUERY LOW

  • QUERY HIGH

  • ARCHIVE LOW

  • ARCHIVE HIGH

  • NULL

The QUERY_LOW, QUERY_HIGH, ARCHIVE_LOW, and ARCHIVE_HIGH values are associated with Hybrid Columnar Compression, a feature of the Enterprise Edition of Oracle AI Database that is dependent on the underlying storage system. See Oracle AI Database Concepts for more information.

NUM_ROWS NUMBER   Number of rows in the subpartition
BLOCKS NUMBER   Number of blocks in the subpartition
EMPTY_BLOCKS NUMBER   Number of empty blocks in the subpartition
AVG_SPACE NUMBER   Average space in the subpartition
CHAIN_CNT NUMBER   Chain count
AVG_ROW_LEN NUMBER   Average row length
SAMPLE_SIZE NUMBER   Sample size
LAST_ANALYZED DATE   Date on which this table was most recently analyzed
BUFFER_POOL VARCHAR2(7)  

Buffer pool for this subpartition:

  • DEFAULT

  • KEEP

  • RECYCLE

  • NULL
FLASH_CACHE VARCHAR2(7)  

Database Smart Flash Cache hint to be used for subpartition blocks:

  • DEFAULT

  • KEEP

  • NONE

Solaris and Oracle Linux functionality only.
CELL_FLASH_CACHE VARCHAR2(7)  

Cell flash cache hint to be used for subpartition blocks:

  • DEFAULT

  • KEEP

  • NONE

See Also: Oracle Exadata Storage Server Software documentation for more information

GLOBAL_STATS VARCHAR2(3)   GLOBAL_STATS will be YES if statistics have been gathered or NO if statistics have not been gathered
USER_STATS VARCHAR2(3)   Indicates whether statistics were entered directly by the user (YES) or not (NO)
INTERVAL VARCHAR2(3)   Indicates whether the partition is in the interval section of an interval partitioned table (YES) or whether the partition is in the range section (NO)
SEGMENT_CREATED VARCHAR2(3)   Indicates whether the table subpartition segment has been created (YES) or not (NO); N/A indicates that this table is not subpartitioned
INDEXING VARCHAR2(3)  

Indicates the indexing property.

Possible values:

  • ON - Indexing is on for this subpartition

  • OFF - Indexing is off for this subpartition

READ_ONLY VARCHAR2(3)  

Indicates whether a subpartition is read-only or read/write:

  • YES: The default setting for the subpartition is read-only.

  • NO: The default setting for the subpartition is read/write.

INMEMORY VARCHAR2(8)   Indicates whether the In-Memory Column Store (IM column store) is enabled (ENABLED) or disabled (DISABLED) for this subpartition
INMEMORY_PRIORITY VARCHAR2(8)  

Indicates the priority for In-Memory Column Store (IM column store) population. Possible values:

  • LOW

  • MEDIUM

  • HIGH

  • CRITICAL

  • NONE

  • NULL
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

  • DBY PARTITION

  • BY SUBPARTITION
INMEMORY_COMPRESSION VARCHAR2(17)  

Indicates the compression level for the IM column store:

  • NO MEMCOMPRESS

  • FOR DML

  • FOR QUERY [ LOW | HIGH ]

  • FOR CAPACITY [ LOW | HIGH ]

  • AUTO

  • NULL

This column has a value based on where the segments lie for a table. For example, if the table is partitioned and is enabled for IM column store, the value is NULL for ALL_TABLES but non-NULL for ALL_TAB_SUBPARTITIONS.

INMEMORY_DUPLICATE    

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

  • DUPLICATE

  • NO DUPLICATE

  • DUPLICATE ALL
INMEMORY_SERVICE VARCHAR2(12)  

Indicates how the IM column store is populated on various instances. The possible values are:

  • DEFAULT: Data is populated on all instances specified with the PARALLEL_INSTANCE_GROUP initialization parameter. If that parameter is not set, then the data is populated on all instances. This is the default.

  • NONE: Data is not populated on any instance.

  • ALL: Data is populated on all instances, regardless of the value of the PARALLEL_INSTANCE_GROUP initialization parameter.

  • USER_DEFINED: Data is populated only on the instances on which the user-specified service is active. The service name corresponding to this is stored in the INMEMORY_SERVICE_NAME column.

INMEMORY_SERVICE_NAME VARCHAR2(1000)   Indicates the service name for the service on which the IM column store should be populated. This column has a value only when the corresponding INMEMORY_SERVICE is USER_DEFINED. In all other cases, this column is null.
CELLMEMORY VARCHAR2(24)  

The value for columnar compression in the storage cell flash cache. Possible values:

  • ENABLED: Oracle Exadata Storage will decide automatically whether to cache in columnar form

  • DISABLED: Oracle Exadata Storage is prevented from caching in columnar form

  • NO CACHECOMPRESS: Oracle Exadata Storage will cache in HCC format (no recompression)

  • FOR QUERY: Oracle Exadata Storage will recompress and cache in INMEMORY query high format

  • FOR CAPACITY: Oracle Exadata Storage will recompress and cache in INMEMORY capacity low format

This column is intended for use with Oracle Exadata.
MEMOPTIMIZE_READ VARCHAR2(8)   Indicates whether the table is enabled for Fast Key Based Access (ENABLED) or not (DISABLED)
MEMOPTIMIZE_WRITE VARCHAR2(8)   For internal use only
HIGH_VALUE_CLOB CLOB   High value (boundary) information for the subpartition, in CLOB format
HIGH_VALUE_JSON JSON   High value (boundary) information for the subpartition, in JSON format

See Also: