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

本站中文解释

Oracle视图DBA_ADVISOR_TASKS存储系统中所有 Advisor 任务的状态和行为信息。它保存了所有配置在数据库中的advisor任务，包括已经执行和未执行的任务，以及它们用于执行任务的任务参数。此外，DBA_ADVISOR_TASKS视图还存储有关最近一次Advisor 任务完成状态的信息，还有每次完成任务的消耗时间，有关负责执行此Advisor任务的用户的信息，以及Advisor任务完成后产生的结果数据。

此外，DBA_ADVISOR_TASKS视图还允许DBA用户查询所有Advisor任务，而不必手动搜索每个实例。它可以帮助DBA用户查找所有配置的Advisor任务，并检查任务的状态，例如已创建但未执行，已完成或未完成。

使用 Oracle DBA_ADVISOR_TASKS 视图的一般步骤如下：
1. 查询 DBA_ADVISOR_TASKS 视图以查看当前配置的 Advisor 任务：
`SELECT * FROM DBA_ADVISOR_TASKS;`
2. 如果需要，可以基于某个特定的任务进行修改：
`UPDATE DBA_ADVISOR_TASKS SET PARAMETER1 = ;`
3. 通过重新执行 DBMS_ADVISOR 包中的 execute 方法执行：
`EXEC DBMS_ADVISOR.EXECUTE(TASK_NAME);`

官方英文解释

DBA_ADVISOR_TASKS displays information about all tasks in the database.

The view contains one row for each task. Each task has a name that is unique to the owner. Task names are just informational and no uniqueness is enforced within any other namespace.

Related View

USER_ADVISOR_TASKS displays information about the tasks owned by the current user. This view does not display the OWNER column.

Column	Datatype	NULL	Description
`OWNER`	`VARCHAR2(128)`		Owner of the task
`TASK_ID`	`NUMBER`	`NOT NULL`	Unique identifier of the task
`TASK_NAME`	`VARCHAR2(128)`		Name of the task
`DESCRIPTION`	`VARCHAR2(256)`		User-supplied description of the task
`ADVISOR_NAME`	`VARCHAR2(128)`		Advisor associated with the task
`CREATED`	`DATE`	`NOT NULL`	Creation date of the task
`LAST_MODIFIED`	`DATE`	`NOT NULL`	Date on which the task was last modified
`PARENT_TASK_ID`	`NUMBER`		Identifier of the parent task (if the task was created because of the recommendation of another task)
`PARENT_RXEC_ID`	`NUMBER`		Identifier of the recommendation within the parent task that resulted in the creation of the task
`LAST_EXECUTION`	`VARCHAR2(128)`		Name of the current or last task execution
`EXECUTION_TYPE`	`VARCHAR2(128)`		Type of the last execution. This information is optional for single-execution tasks.
`EXECUTION_TYPE#`	`NUMBER`		Reserved for internal use
`EXECUTION_DESCRIPTION`	`VARCHAR2(256)`		Optional description of the last execution
`EXECUTION_START`	`DATE`		Execution start date and time of the task
`EXECUTION_END`	`DATE`		Execution end date and time of the task
`STATUS`	`VARCHAR2(11)`		Current operational status of the task: `INITIAL` – Initial state of the task; no recommendations are present `EXECUTING` – Task is currently running `INTERRUPTED` – Task analysis was interrupted by the user. Recommendation data, if present, can be viewed and reported at this time. `COMPLETED` – Task successfully completed the analysis operation. Recommendation data can be viewed and reported. `ERROR` – An error occurred during the analysis operation. Recommendations, if present, can be viewed and reported at this time.
`STATUS_MESSAGE`	`VARCHAR2(4000)`		Informational message provided by the advisor regarding the status
`PCT_COMPLETION_TIME`	`NUMBER`		Percent completion, in terms of time, of the task when it is executing
`PROGRESS_METRIC`	`NUMBER`		Metric that measures the progress of the task in terms of quality. Each advisor may have its own metric.
`METRIC_UNITS`	`VARCHAR2(64)`		Unit of the metric used to measure progress
`ACTIVITY_COUNTER`	`NUMBER`		Counter that is updated frequently by the advisor, denoting that useful work is being performed
`RECOMMENDATION_COUNT`	`NUMBER`		Number of recommendations produced
`ERROR_MESSAGE`	`VARCHAR2(4000)`		Informational message or an error message indicating the current operation or condition
`SOURCE`	`VARCHAR2(128)`		Optional name that identifies the creator of the task
`HOW_CREATED`	`VARCHAR2(30)`		Optional task or template on which the object was based
`READ_ONLY`	`VARCHAR2(5)`		Indicates whether the task is read-only (`TRUE`) or not (`FALSE`)
`SYSTEM_TASK`	`VARCHAR2(5)`		Indicates whether the task is a system task (`TRUE`) or not (`FALSE`). The automatic SQL tuning task, `SYS_AUTO_SQL_TUNING_TASK`, is one example of a system task.
`ADVISOR_ID`	`NUMBER`	`NOT NULL`	Unique identifier for the advisor
`STATUS#`	`NUMBER`		Reserved for internal use