DBA_TAB_STATISTICS视图
DBA_TAB_STATISTICS显示数据库中所有表的优化器统计信息。它的列与ALL_TAB_STATISTICS中的列相同。
ALL_TAB_STATISTICS显示当前用户可以访问的表的优化器统计信息。
USER_TAB_STATISTICS显示当前用户拥有的表的优化器统计信息。此视图不显示所有者列。
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:
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:
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) |
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