Oracle 视图 DBA_HIST_IOSTAT_DETAIL 官方解释，作用，如何使用详细说明
本站中文解释
_VIEW视图 Oracle DBA_HIST_IOSTAT_DETAIL_VIEW视图是用来存储每次实例重新启动之后，IO性能参数的历史信息。该视图包含SQL语句，像IOPS（每秒I/0操作数），数据传输量以及平均延迟等。
要使用DBA_HIST_IOSTAT_DETAIL_VIEW视图，首先必须在_io_stat_duration和_io_stat_delta初始化参数值上开启性能参数收集。然后可以使用如下查询，从DBA_HIST_IOSTAT_DETAIL_VIEW视图检索所需IO性能信息，如下：
SELECT *
FROM dba_hist_iostat_detail_view
WHERE snap_id BETWEEN &start_id AND &end_id;
上述查询将返回在指定时间（start_id和end_id之间）收集的IO性能指标和参数信息，例如IOPS，数据传输量，最大延迟等。这种查询特别有用，当用户正在监视数据库性能时，可以把IO性能参数记录到dba_hist_iostat_detail_view视图中。
官方英文解释
DBA_HIST_IOSTAT_DETAIL displays I/O statistics aggregated by combination of file type and function (component).
This view contains snapshots of V$IOSTAT_FILE and V$IOSTAT_FUNCTION.
| Column | Datatype | NULL | Description |
|---|---|---|---|
|
|
| Unique snapshot ID |
|
|
| Database ID for the snapshot |
|
|
| Instance number for the snapshot |
|
|
| Function ID |
|
|
| Function name |
|
|
| Type of file (for example, log file, data file, and so on) |
|
|
| Name of the file, in the case of a data file or temp file. For all other files, a corresponding string to be displayed (for example, |
|
|
| Number of single block megabytes read |
|
|
| Number of single block megabytes written |
|
|
| Number of multiblock megabytes read |
|
|
| Number of multiblock megabytes written |
|
|
| Number of single block read requests |
|
|
| Number of single block write requests |
|
|
| Number of multiblock read requests |
|
|
| Number of multiblock write requests |
|
|
| Number of I/O waits by functionality |
|
|
| Total wait time (in milliseconds) |
|
| The database ID of the PDB for the sampled session | |
|
| The ID of the container that
|
See Also:
“V$IOSTAT_FILE”
“V$IOSTAT_FUNCTION”
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标签：视图,性能参数,数据传输,信息,性能