Oracle 视图 V$FILEMETRIC 官方解释，作用，如何使用详细说明
本站中文解释
V$FILEMETRIC视图提供实时文件I/O统计信息。属于动态性能视图，可以用来检测控制文件的I/O活动，比如档案的读写狀態、受到的I/O有效负载以及档案的I/O操作次数等。
使用方法：
1、查看一个档案的I/O信息：
SELECT * FROM V$FILEMETRIC WHERE file_name=’&filename’;
2、查看一个档案的总体I/O信息：
SELECT SUM(ontimig)*100 / SUM(total) AS “TOTAL I/O%”
FROM v$FILEMETRIC WHERE file_name=’&filename’;
3、查看几个档案的总体I/O信息：
SELECT SUM(ontimig)*100 / SUM(total) AS “TOTAL I/O%”
FROM v$FILEMETRIC WHERE file_name IN (‘file1′,’file2′,’file3’);
官方英文解释
V$FILEMETRIC displays values of file metrics for the most recent 10-minute interval. A history of the last one hour will be kept in the system.
| Column | Datatype | Description |
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Begin time of the interval |
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End time of the interval |
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Interval size (in hundredths of a second) |
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File number |
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Timestamp of the file creation |
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Average file read time (in hundredths of a second) |
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Average file write time (in hundredths of a second) |
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Number of physical reads |
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Number of physical writes |
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Number of physical block reads |
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Number of physical block writes |
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The ID of the container to which the data pertains. Possible values include:
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