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数据字典表之：DBA_HIGH_WATER_MARK_STATISTICS
作者：eygle |【转载时请以超链接形式标明文章出处和作者信息及本声明】链接：http://www.eygle.com/archives/2008/04/dba_high_water_mark_statistics.html
DBA_HIGH_WATER_MARK_STATISTICS是在Oracle10g中引入的。
其中记录了数据库相关的一些HWM数据，包括数据库的空间使用，会话数量，表数量等
以下是这个视图的创建过程，数据来自Oracle10g 10.2.0.3
CREATE OR REPLACE FORCE VIEW SYS.dba_high_water_mark_statistics (dbid,
NAME,
VERSION,
highwater,
LAST_VALUE,
description
)
AS
SELECT dbid, hwm.NAME, VERSION, highwater, LAST_VALUE, description
FROM wri$_dbu_high_water_mark hwm, wri$_dbu_hwm_metadata mt
WHERE hwm.NAME = mt.NAME
AND hwm.NAME NOT LIKE '_HWM_TEST%'
AND /* filter out test hwm */
BITAND (mt.method, 4) != 4 /* filter out disabled hwm */
;
COMMENT ON TABLE SYS.DBA_HIGH_WATER_MARK_STATISTICS IS 'Database High Water Mark Statistics';
COMMENT ON COLUMN SYS.DBA_HIGH_WATER_MARK_STATISTICS.DBID IS 'database ID';
COMMENT ON COLUMN SYS.DBA_HIGH_WATER_MARK_STATISTICS.NAME IS 'name of high water mark statistics';
COMMENT ON COLUMN SYS.DBA_HIGH_WATER_MARK_STATISTICS.VERSION IS 'the database version the highwater marks are tracked in';
COMMENT ON COLUMN SYS.DBA_HIGH_WATER_MARK_STATISTICS.HIGHWATER IS 'highest value for statistic seen at sampling time';
COMMENT ON COLUMN SYS.DBA_HIGH_WATER_MARK_STATISTICS.LAST_VALUE IS 'value of statistic at last sample time';
COMMENT ON COLUMN SYS.DBA_HIGH_WATER_MARK_STATISTICS.DESCRIPTION IS 'description of high water mark';
DROP PUBLIC SYNONYM DBA_HIGH_WATER_MARK_STATISTICS;
CREATE PUBLIC SYNONYM DBA_HIGH_WATER_MARK_STATISTICS FOR SYS.DBA_HIGH_WATER_MARK_STATISTICS;
GRANT SELECT ON SYS.DBA_HIGH_WATER_MARK_STATISTICS TO SELECT_CATALOG_ROLE;
历史上的今天...
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By eygle on 2008-04-09 23:47 | Comments (0) | Posted to Knowledge Base | Edit |Pageviews:
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