Oracle 视图 V$REDO_DEST_RESP_HISTOGRAM 官方解释,作用,如何使用详细说明
本站中文解释
Oracle视图V$REDO_DEST_RESP_HISTOGRAM用于报告与每个重做可用性相关的响应时间的统计信息。
它由如下列光标字段组成:
-DESTINATION_ID: 重做描述符唯一标识符。
-RESP_LOW_BOUND: 响应时间的最低界限(ms)。
-ENTRIES: 响应时间落入响应低界限及高界限范围内的记录条数。
-RESP_RATIO: 相对于重做日志组总百分比比率。
要查询该视图,可以执行以下查询:
SELECT DESTINATION_ID, RESP_LOW_BOUND, ENTRIES, RESP_RATIO
FROM V$REDO_DEST_RESP_HISTOGRAM;
此查询将显示每个重做可用性的相关响应时间信息。这可以提供数据库管理员有关重做可用性分布的有趣信息。
官方英文解释
V$REDO_DEST_RESP_HISTOGRAM
provides statistical information for each redo transport destination.
Column | Datatype | Description |
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A nonnegative integer value representing a |
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A text string that shows the last wall-clock time that a bucket was hit |
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A positive integer value that represents a bucket of seconds, 1, 2, 3, up to 300 seconds, followed by 5 additional buckets that represent 600, 1200, 2400, 4800, and 9600 ( >= 4801) seconds |
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A nonnegative integer that shows the number of times a particular bucket was hit by the destination specified by |
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The ID of the container to which the data pertains. Possible values include:
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