摘要：
DBA_ TABLES描述了数据库中的所有相关表。它的列与ALL_ TABLES中的列相同。要获取此视图的统计信息，请使用ANALYZE SQL语句。ALL_ TABLS描述了这些相关表的访问
DBA_TABLES describes all relational tables in the database. Its columns are the same as those in ALL_TABLES. To gather statistics for this view, use the ANALYZE SQL statement.
ALL_TABLES describes the relational tables accessible to the current user. To gather statistics for this view, use the ANALYZE SQL statement.
DBA_TABLESdescribes all relational tables in the database.USER_TABLESdescribes the relational tables owned by the current user. This view does not display theOWNERcolumn.
Note:
Columns marked with an asterisk (*) are populated only if you collect statistics on the table with the ANALYZE statement or theDBMS_STATS package.| Column | Datatype | NULL | Description |
|---|---|---|---|
OWNER | VARCHAR2(30) | NOT NULL | Owner of the table |
TABLE_NAME | VARCHAR2(30) | NOT NULL | Name of the table |
TABLESPACE_NAME | VARCHAR2(30) | Name of the tablespace containing the table; null for partitioned, temporary, and index-organized tables | |
CLUSTER_NAME | VARCHAR2(30) | Name of the cluster, if any, to which the table belongs | |
IOT_NAME | VARCHAR2(30) | Name of the index-organized table, if any, to which the overflow or mapping table entry belongs. If the IOT_TYPE column is not null, then this column contains the base table name. | |
STATUS | VARCHAR2(8) | If a previous DROP TABLE operation failed, indicates whether the table is unusable (UNUSABLE) or valid (VALID) | |
PCT_FREE | NUMBER | Minimum percentage of free space in a block; null for partitioned tables | |
PCT_USED | NUMBER | Minimum percentage of used space in a block; null for partitioned tables | |
INI_TRANS | NUMBER | Initial number of transactions; null for partitioned tables | |
MAX_TRANS | NUMBER | Maximum number of transactions; null for partitioned tables | |
INITIAL_EXTENT | NUMBER | Size of the initial extent (in bytes); null for partitioned tables | |
NEXT_EXTENT | NUMBER | Size of secondary extents (in bytes); null for partitioned tables | |
MIN_EXTENTS | NUMBER | Minimum number of extents allowed in the segment; null for partitioned tables | |
MAX_EXTENTS | NUMBER | Maximum number of extents allowed in the segment; null for partitioned tables | |
PCT_INCREASE | NUMBER | Percentage increase in extent size; null for partitioned tables | |
FREELISTS | NUMBER | Number of process freelists allocated to the segment; null for partitioned tables | |
FREELIST_GROUPS | NUMBER | Number of freelist groups allocated to the segment; null for partitioned tables | |
LOGGING | VARCHAR2(3) | Logging attribute; NULL for partitioned tables | |
BACKED_UP | VARCHAR2(1) | Has table been backed up since last change | |
NUM_ROWS* | NUMBER | Number of rows in the table | |
BLOCKS* | NUMBER | Number of used data blocks in the table | |
EMPTY_BLOCKS* | NUMBER | Number of empty (never used) data blocks in the table | |
AVG_SPACE* | NUMBER | Average amount of free space, in bytes, in a data block allocated to the table | |
CHAIN_CNT* | NUMBER | Number of rows in the table that are chained from one data block to another, or which have migrated to a new block, requiring a link to preserve the old ROWID | |
AVG_ROW_LEN* | NUMBER | Average length of a row in the table (in bytes) | |
AVG_SPACE_FREELIST _BLOCKS | NUMBER | Average freespace of all blocks on a freelist | |
NUM_FREELIST_BLOCKS | NUMBER | Number of blocks on the freelist | |
DEGREE | VARCHAR2(10) | Number of threads per instance for scanning the table | |
INSTANCES | VARCHAR2(10) | Number of instances across which the table is to be scanned | |
CACHE | VARCHAR2(5) | Indicates whether the table is to be cached in the buffer cache (Y) or not (N) | |
TABLE_LOCK | VARCHAR2(8) | Indicates whether table locking is enabled (ENABLED) or disabled (DISABLED) | |
SAMPLE_SIZE | NUMBER | Sample size used in analyzing this table | |
LAST_ANALYZED | DATE | Date on which this table was most recently analyzed | |
PARTITIONED | VARCHAR2(3) | Indicates whether this table is partitioned. Set to YES if it is partitioned. | |
IOT_TYPE | VARCHAR2(12) | If this is an index-organized table, then IOT_TYPE is IOT, IOT_OVERFLOW, or IOT_MAPPING. If this is not an index-organized table, then IOT_TYPEis NULL. | |
TEMPORARY | VARCHAR2(1) | Can the current session only see data that it place in this object itself? | |
SECONDARY | VARCHAR2(1) | Whether the trigger is a secondary object created by theODCIIndexCreate method of the Oracle Data Cartridge (Y |N) | |
NESTED | VARCHAR2(3) | Indicates whether the table is a nested table (YES) or not (NO) | |
BUFFER_POOL | VARCHAR2(7) | The default buffer pool for the object. NULL for partitioned tables | |
ROW_MOVEMENT | VARCHAR2(8) | Whether partitioned row movement is enabled or disabled | |
GLOBAL_STATS | VARCHAR2(3) | For partitioned tables, indicates whether statistics were collected for the table as a whole (YES) or were estimated from statistics on underlying partitions and subpartitions (NO) | |
USER_STATS | VARCHAR2(3) | Indicates whether statistics were entered directly by the user (YES) or not (NO) | |
DURATION | VARCHAR2(15) | Indicates the duration of a temporary table:
Null for a permanent table | |
SKIP_CORRUPT | VARCHAR2(8) | Whether the Oracle Database ignores blocks marked corrupt during table and index scans (ENABLED) or raises an error (DISABLED). To enable this feature, run the DBMS_REPAIR.SKIP_CORRUPT_BLOCKSprocedure. | |
MONITORING | VARCHAR2(3) | Whether the table has the MONITORING attribute set | |
CLUSTER_OWNER | VARCHAR2(30) | Owner of the cluster, if any, to which the table belongs | |
DEPENDENCIES | VARCHAR2(8) | Indicates whether row-level dependency tracking is enabled (ENABLED) or disabled (DISABLED) | |
COMPRESSION | VARCHAR2(8) | Indicates whether table compression is enabled (ENABLED) or not (DISABLED); null for partitioned tables | |
DROPPED | VARCHAR2(3) | Indicates whether the table has been dropped and is in the recycle bin (YES) or not (NO); null for partitioned tables |