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Oracle 视图 V$RSRC_PLAN_HISTORY 官方解释，作用，如何使用详细说明

本站中文解释

Oracle视图V$RSRC_PLAN_HISTORY用于存储当前实例中发生过的资源管理计划(Resource Manager)变更。它可以帮助查看历史资源计划变更并持续跟踪使用情况。

V$RSRC_PLAN_HISTORY表有如下两个列:

PLAN 控制新计划进行应用的 Oracle 会话或操作系统进程 ID
PLAN_START 即某个资源管理计划生效开始时间

使用V$RSRC_PLAN_HISTORY视图来查看当前正在使用的资源管理器的计划变更记录，可以使用下述SQL语句：

SELECT *
FROM v$rsrc_plan_history
WHERE plan = (SELECT plan_id FROM v$rsrc_plan WHERE status=’ACTIVE’);

该语句可以查询V$RSRC_PLAN_HISTORY表中当前正在使用的资源管理计划中发生过的变更记录，并显示PLAN_START列以查看哪个资源管理计划何时生效.

官方英文解释

V$RSRC_PLAN_HISTORY displays a history of when a resource plan was enabled, disabled, or modified on the instance. Up to 15 of the most recent entries are shown. Once the database is opened, this view shows at least one row. The row with the most recent START_TIME and with END_TIME equal to NULL gives information about the current resource plan.
Column Datatype Description

SEQUENCE#

NUMBER

A sequential counter that uniquely describes a row. When the instance is restarted, this value is reset to zero.

ID

NUMBER

Resource plan ID; NULL if the Resource Manager was disabled

NAME

VARCHAR2(30)

Resource plan name; NULL if the Resource Manager was disabled

START_TIME

DATE

Time that the resource plan was enabled

END_TIME

DATE

Time that the resource plan was disabled; NULL if the row contains the current resource plan information

ENABLED_BY_SCHEDULER

VARCHAR2(5)

Indicates whether the plan was enabled by a Job Scheduler window (TRUE) or not (FALSE)

WINDOW_NAME

VARCHAR2(128)

Job Scheduler window that triggered the resource plan event; NULL if a user triggered the resource plan event

ALLOWED_AUTOMATED_SWITCHES

VARCHAR2(5)

Indicates whether automated plan switches were allowed after this resource plan event (TRUE) or whether automated plan switches were disabled after this resource plan event (FALSE)

See Also: the SWITCH_PLAN procedure

CPU_MANAGED

VARCHAR2(3)

Indicates whether the resource plan has parameters that specify a policy for how the Resource Manager should schedule sessions to manage CPU usage (ON) or whether Resource Manager is not managing CPU usage (OFF)

CPU_SCOPE

VARCHAR2(13)

Reserved for future use

INSTANCE_CAGING

VARCHAR2(3)

Indicates whether instance caging is enabled (ON) or disabled (OFF). Instance caging is enabled if the CPU_COUNT initialization parameter is explicitly modified to a value other than 0 and Resource Manager is enabled.

PARALLEL_EXECUTION_MANAGED

VARCHAR2(32)

State of parallel statement queuing:

  • OFF – Parallel statement queuing is disabled

  • STARTUP – Parallel statement queuing is enabled. This is a temporary state that can occur when an Oracle RAC database is undergoing configuration changes

  • FIFO – Parallel statement queuing is enabled. All parallel statements are managed in a single Oracle RAC FIFO queue

  • FULL – Parallel statement queuing is enabled. All parallel statements are managed in per-consumer group queues according to the current resource plan. This state is used when a resource plan that contains resource allocation directives (MGMT_P*) is enabled.

  • DISABLED – Parallel statement queuing is disabled. This state can occur when memory is unavailable for use by parallel statement queuing in the System Global Area (SGA). Restart the Oracle instance to re-enable parallel statement queuing.

For an Oracle RAC database, only the instance running as master Database Resource Manager (DBRM) shows the correct state of parallel statement queuing. All other instances default to the value FULL. A single instance database always shows the correct value for this field.

CPU_COUNT

NUMBER

Value of the CPU_COUNT initialization parameter in the container to which the data pertains

CPU_MIN_COUNT

NUMBER

Value of the CPU_MIN_COUNT initialization parameter in the container to which the data pertains

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 V$RSRC_PLAN_HISTORY 官方解释，作用，如何使用详细说明
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