DBA_TAB_STATISTICS视图

Column	Datatype	NULL	Description
OWNER	VARCHAR2(30)		Owner of the object 对象的owner
TABLE_NAME	VARCHAR2(30)		Name of the table 表名
PARTITION_NAME	VARCHAR2(30)		Name of the partition 分区名
PARTITION_POSITION	NUMBER		Position of the partition within the table 分区在表中的位置
SUBPARTITION_NAME	VARCHAR2(30)		Name of the subpartition 子分区的名字
SUBPARTITION_POSITION	NUMBER		Position of the subpartition within the partition 子分区在表中的位置
OBJECT_TYPE	VARCHAR2(12)		Type of the object: TABLE PARTITION SUBPARTITION 表的类型： 表 分区表 子分区表
NUM_ROWS	NUMBER		Number of rows in the object 表中有多少行记录
BLOCKS	NUMBER		Number of used blocks in the object 表有多少块
EMPTY_BLOCKS	NUMBER		Number of empty blocks in the object 表中空块的数量
AVG_SPACE	NUMBER		Average available free space in the object 对象中可用的平均空闲空间
CHAIN_CNT	NUMBER		Number of chained rows in the object 表中发生行迁移或者行链接的数量
AVG_ROW_LEN	NUMBER		Average row length, including row overhead 平均行长度，包括行开销
AVG_SPACE_FREELIST_BLOCKS	NUMBER		Average freespace of all blocks on a freelist 自由列表中所有块的平均自由空间
NUM_FREELIST_BLOCKS	NUMBER		Number of blocks on the freelist 自由列表上的块数
AVG_CACHED_BLOCKS	NUMBER		Average number of blocks in the buffer cache 缓冲区缓存中的平均块数
AVG_CACHE_HIT_RATIO	NUMBER		Average cache hit ratio for the object 对象的平均缓存命中率
SAMPLE_SIZE	NUMBER		Sample size used in analyzing the table 分析表时的采样比例
LAST_ANALYZED	DATE		Date of the most recent time the table was analyzed 最近一次分析表的时间
GLOBAL_STATS	VARCHAR2(3)		Indicates whether statistics were calculated without merging underlying partitions (YES) or not (NO) 作为一个整体（分区表）表的统计的是否准确表示是否被用户统计信息 ( YES ) or ( NO )
USER_STATS	VARCHAR2(3)		Indicates whether statistics were entered directly by the user ( YES ) or not ( NO ) 表示是否被用户统计信息 ( YES ) or ( NO )
STATTYPE_LOCKED	VARCHAR2(5)		Type of statistics lock: DATA CACHE ALL 统计信息的类型： data cache all：表示统计信息被锁定
STALE_STATS	VARCHAR2(3)		Indicates whether statistics for the object are stale (YES) or not (NO) 统计信息是否过期（yes  过期）或者（no 未过期）