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在数据库的逻辑结构中,表空间将不同类型的数据分别组织在一起,如系统数据、用户数据、临时数据、回滚数据等。Column | Datatype | NULL | Description |
OWNER | VARCHAR2(128) | Username of the segment owner | |
SEGMENT_NAME | VARCHAR2(128) | Name, if any, of the segment | |
PARTITION_NAME | VARCHAR2(128) | Object Partition Name (Set to NULL for nonpartitioned objects) | |
SEGMENT_TYPE | VARCHAR2(18) |
Type of segment:
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SEGMENT_SUBTYPE | VARCHAR2(10) | Subtype of LOB segment: SECUREFILE, ASSM, MSSM, andNULL | |
TABLESPACE_NAME | VARCHAR2(30) | Name of the tablespace containing the segment | |
HEADER_FILE | NUMBER | ID of the file containing the segment header | |
HEADER_BLOCK | NUMBER | ID of the block containing the segment header | |
BYTES | NUMBER | Size, in bytes, of the segment | |
BLOCKS | NUMBER | Size, in Oracle blocks, of the segment | |
EXTENTS | NUMBER | Number of extents allocated to the segment | |
INITIAL_EXTENT | NUMBER | Size in bytes requested for the initial extent of the segment at create time. (Oracle rounds the extent size to multiples of 5 blocks if the requested size is greater than 5 blocks.) | |
NEXT_EXTENT | NUMBER | Size in bytes of the next extent to be allocated to the segment | |
MIN_EXTENTS | NUMBER | Minimum number of extents allowed in the segment | |
MAX_EXTENTS | NUMBER | Maximum number of extents allowed in the segment | |
MAX_SIZE | NUMBER | Maximum number of blocks allowed in the segment | |
RETENTION | VARCHAR2(7) | Retention option for SECUREFILE segment | |
MINRETENTION | NUMBER | Minimum retention duration for SECUREFILE segment | |
PCT_INCREASE | NUMBER | Percent by which to increase the size of the next extent to be allocated | |
FREELISTS | NUMBER | Number of process freelists allocated to this segment | |
FREELIST_GROUPS | NUMBER | Number of freelist groups allocated to this segment | |
RELATIVE_FNO | NUMBER | Relative file number of the segment header | |
BUFFER_POOL | VARCHAR2(7) |
Buffer pool to be used for segment blocks:
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FLASH_CACHE | VARCHAR2(7) |
Database Smart Flash Cache hint to be used for segment blocks:
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CELL_FLASH_CACHE | VARCHAR2(7) |
Cell flash cache hint to be used for segment blocks:
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INMEMORY | VARCHAR2(8) | Indicates whether the In-Memory Column Store (IM column store) is enabled (ENABLED) or disabled (DISABLED) for this segment | |
INMEMORY_PRIORITY1 | VARCHAR2(8) |
Indicates the priority for In-Memory Column Store (IM column store) population:
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INMEMORY_DISTRIBUTE1 | VARCHAR2(15) |
Indicates how the IM column store is distributed in an Oracle Real Application Clusters (Oracle RAC) environment:
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INMEMORY_DUPLICATE1 | VARCHAR2(13) |
Indicates the duplicate setting for the IM column store in an Oracle RAC environment:
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INMEMORY_COMPRESSION1 | VARCHAR2(17) |
Indicates the compression level for the IM column store:
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Column | Datatype | NULL | Description |
OWNER | VARCHAR2(128) | Owner of the segment associated with the extent | |
SEGMENT_NAME | VARCHAR2(128) | Name of the segment associated with the extent | |
PARTITION_NAME | VARCHAR2(128) | Object Partition Name (Set to NULL for nonpartitioned objects) | |
SEGMENT_TYPE | VARCHAR2(18) | Type of the segment: INDEX PARTITION, TABLE PARTITION | |
TABLESPACE_NAME | VARCHAR2(30) | Name of the tablespace containing the extent | |
EXTENT_ID | NUMBER | Extent number in the segment | |
FILE_ID | NUMBER | File identifier number of the file containing the extent | |
BLOCK_ID | NUMBER | Starting block number of the extent | |
BYTES | NUMBER | Size of the extent in bytes | |
BLOCKS | NUMBER | Size of the extent in Oracle blocks | |
RELATIVE_FNO | NUMBER | Relative file number of the first extent block |
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原文地址:http://blog.csdn.net/a_niubility/article/details/51776428