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Oracle 视图 DBA_HIST_BASELINE_METADATA 官方解释，作用，如何使用详细说明

本站中文解释

Oracle视图DBA_HIST_BASELINE_METADATA是用于收集基线更改环境诊断信息的系统视图。它由基线跟踪—自Oracle Database 11g引入的新特性，可以基于数据库中已有信息组成更新基线的表生成的，并在不断的更新中反映在这个视图中。 具体来说，它能够提供数据库中哪些文件及其存储在UTFFormat中的更改环境的诊断信息，它的大小，以及其它一些属性的数据。

使用DBA_HIST_BASELINE_METADATA视图的方法是在SQL命令窗口中运行以下SELECT语句：

SELECT * FROM dba_hist_baseline_metadata;

这条语句，将检索出所有关于数据库中基线更改环境诊断信息的数据，比如文件名，其存储在UTFFormat中，文件大小等等。可以根据需要，添加更多的过滤条件，改变查询的结果。

官方英文解释

DBA_HIST_BASELINE_METADATA displays metadata information for the baseline.

Column Datatype NULL Description

DBID

NUMBER

NOT NULL

Database ID

BASELINE_ID

NUMBER

NOT NULL

Internal ID for the baseline

BASELINE_NAME

VARCHAR2(64)

User-specified name for the baseline

BASELINE_TYPE

VARCHAR2(13)

The baseline type, as follows:

STATIC – baselines that are created manually by the user

MOVING WINDOW – baselines that have dynamic start and end snapshot IDs

GENERATED – baselines that are automatically generated by the system, using a template

START_SNAP_ID

NUMBER

Start snapshot ID for the baseline

END_SNAP_ID

NUMBER

End snapshot ID for the baseline

MOVING_WINDOW_SIZE

NUMBER

If BASELINE_TYPE is MOVING WINDOW, this field is the size of the moving window in number of days.

If NULL, then the window size is the value of the AWR retention setting.

CREATION_TIME

DATE

Time the baseline was created

EXPIRATION

NUMBER

How long to keep the baseline, in number of days. If the value is NULL, the baseline will be kept forever.

TEMPLATE_NAME

VARCHAR2(64)

Name of the template that created this baseline, if any

LAST_TIME_COMPUTED

DATE

Last time that statistics were computed on the baseline

CON_ID

NUMBER

The ID of the container to which the data pertains. Possible values include:

  • 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

  • 1: This value is used for rows containing data that pertain to only the root

  • n: Where n is the applicable container ID for the rows containing data


数据运维技术 » Oracle 视图 DBA_HIST_BASELINE_METADATA 官方解释，作用，如何使用详细说明
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