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

本站中文解释

Oracle的V$GCR_METRICS是一种系统监视视图，它可以查询出Global Cache和Global Enqueue Services (GES)系统中的缓存数据。它用于监视系统性能，帮助有关的管理员采取适当措施改善性能。它可以用来检测以下事件:

1. 数据库中锁定的会话或资源
2. 多个实例之间无法保持一致性或完整性的全局数据
3. 在Global Cache Service中失效的心跳
4. 连接中出现的延迟
5. 在远程访问中出现的超时

为了使用这个视图，首先应该确定连接到数据库的实例的状态。如果实例已经关闭或发出SUSPEND或SUSPEND，那么应该不再使用V$GCR_METRICS视图。可以使用以下SQL查询来检查实例的状态:

SELECT * FROM V$INSTANCE;

接下来，就可以使用V$GCR_METRICS视图来确认系统中是否存在任何失效的会话或资源锁定，远程访问是否正常运行，全局缓存是否正常等。可以使用以下SQL语句来完成:

SELECT * FROM V$GCR_METRICS;

官方英文解释

V$GCR_METRICS displays information about the current status of the metrics defined to the GCR component that runs under the LMHB background process to detect and mitigate potential issues in the cluster instances.

Column Datatype Description

METRIC_ID

NUMBER

Metric identification number as used internally to refer to the metric

METRIC_NAME

VARCHAR2(40)

Name of the metric

ENVIRONMENT

NUMBER

Environment that the metric should run in:

  • 0: Nowhere (do not run)

  • 1: Oracle ASM instance only

  • 2: Oracle Database instance only

  • 3: Oracle ASM and Oracle Database instance

  • 4: Standby instance

  • 5: Oracle ASM and Standby instance

  • 6: Oracle Database and Standby instance

  • 7: Oracle Database, Oracle ASM, and Standby instance

  • 15: All instance types

FREQUENCY

NUMBER

How often the metric runs, in seconds

SCOPE

NUMBER

The scope of sharing of the metric:

  • 0: The metric does not have associated data

  • 1: Global – shared with all other instances in the cluster

  • 2: Local – used only locally (not shared)

  • 4: Node Global – shared with other instances in the cluster on the same node only

  • 8: DB Only – Shared with other instances of the same database only

DATA_TYPE

VARCHAR2(7)

The type of the data associated with this metric:

  • 0: None

  • 1: Boolean

  • 2: Numeric

  • 3: Process

STATUS

VARCHAR2(9)
Indicates the status of the metric:

  • ACTIVE: Indicates that the metric is active.

  • INACTIVE: Indicates that the metric is turned off.

STATUS_CHANGE_TIME

TIMESTAMP(6)

Time of last metric change of status

LAST_RAN_ITERATION

NUMBER

Iteration of the last time the metric ran

LAST_RAN_TIME

TIMESTAMP(6)

Time of last run

LAST_PASS_ITERATION

NUMBER

Iteration of last time the metric passed

LAST_PASS_TIME

TIMESTAMP(6)

Time of last metric pass

TOTAL_PASSES

NUMBER

Total number of times the metric passed since start of LMHB

LAST_FAIL_ITERATION

NUMBER

Iteration of last time the metric failed

LAST_FAIL_TIME

TIMESTAMP(6)

Time of last metric failure

TOTAL_FAILS

NUMBER

Total number of times the metric has failed since start of LMHB

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$GCR_METRICS 官方解释，作用，如何使用详细说明
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