Oracle教程 2023-03-31

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

Oracle视图V$MEMORY_DYNAMIC_COMPONENTS显示动态内存组件信息，包括当前内存使用量和最大值，它可以帮助我们诊断当前的内存使用情况，以及为Oracle提供了重要的性能指标。

具体使用方法：

1. 使用查询语句查看动态内存组件的最大值和当前使用量：

SELECT * FROM V$MEMORY_DYNAMIC_COMPONENTS;

2. 查看指定动态内存组件的最大值和当前使用量：

SELECT * FROM V$MEMORY_DYNAMIC_COMPONENTS WHERE COMPONENT_NAME=’name’;

其中，name为动态内存组件的名称，可以使用上面查询查看系统中所有可用的动态内存组件名称。

V$MEMORY_DYNAMIC_COMPONENTS displays information about the dynamic SGA components.

This view summarizes information based on all completed SGA resize operations since instance startup. All sizes are expressed in bytes.

Column	Datatype	Description
`COMPONENT`	`VARCHAR2(64)`	Component name
`CURRENT_SIZE`	`NUMBER`	Current size of the component
`MIN_SIZE`	`NUMBER`	Minimum size of the component since instance startup
`MAX_SIZE`	`NUMBER`	Maximum size of the component since instance startup
`USER_SPECIFIED_SIZE`	`NUMBER`	Value of the user parameter for the component
`OPER_COUNT`	`NUMBER`	Number of operations since instance startup
`LAST_OPER_TYPE`	`VARCHAR2(13)`	Last completed operation for the component: `STATIC` `INITIALIZING` `DISABLED` `GROW` `SHRINK` `SHRINK_CANCEL`
`LAST_OPER_MODE`	`VARCHAR2(9)`	Mode of the last completed operation: `MANUAL` `DEFERRED` `IMMEDIATE`
`LAST_OPER_TIME`	`DATE`	Start time of the last completed operation
`GRANULE_SIZE`	`NUMBER`	Granularity of the `GROW` or `SHRINK` operation
`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

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