DBA_HIGH_WATER_MARK_STATISTICS视图

从Oracle10g开始，增加了DBA_HIGH_WATER_MARK_STATISTICS视图，用以记录段的HWM信息，Oracle文档对这个视力的描述如下：[@more@]

DBA_HIGH_WATER_MARK_STATISTICS

DBA_HIGH_WATER_MARK_STATISTICS displays information about database high-watermark statistics.

Column	Datatype	NULL	Description
DBID	NUMBER	NOT NULL	Identifier of the database for which the high-watermark statistics are tracked
NAME	VARCHAR2(64)	NOT NULL	Name of the high-watermark statistic (See Table 4-2)
VERSION	VARCHAR2(17)	NOT NULL	Database version in which the high-watermarks were tracked
HIGHWATER	NUMBER		Highest value of the statistic seen at sampling time
LAST_VALUE	NUMBER		Value of the statistic at the last sample time
DESCRIPTION	VARCHAR2(128)		Description of the high-watermark statistics (See Table 4-2)

Table 4-2 DBA_HIGH_WATER_MARK_STATISTICS Statistics

Name	Description
USER_TABLES	Number of User Tables
SEGMENT_SIZE	Size of Largest Segment (Bytes)
PART_TABLES	Maximum Number of Partitions belonging to an User Table
PART_INDEXES	Maximum Number of Partitions belonging to an User Index
USER_INDEXES	Number of User Indexes
SESSIONS	Maximum Number of Concurrent Sessions seen in the database
DB_SIZE	Maximum Size of the Database (Bytes)
DATAFILES	Maximum Number of Datafiles
TABLESPACES	Maximum Number of Tablespaces
CPU_COUNT	Maximum Number of CPUs
QUERY_LENGTH	Maximum Query Length
SERVICES	Maximum Number of Services

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