Oracle教程 2023-02-24

Oracle 视图 V$SGA 官方解释，作用，如何使用详细说明

视图

V$SGA视图是Oracle数据库中被广泛使用的动态性能视图之一，它显示了SGA（共享全局区）中的指标和参数，并可以发出警报和错误信息。

V$SGA视图使用于更改SGA大小和参数设置，例如CPU_COUNT，可以快速调整内存分配，并根据Oracle内核变化紧急调整内存大小。此外，V$SGA视图还可以检查等待时间、块大小和空闲内存，从而满足用户的内存要求。

通过使用V$SGA视图可以查看SGA组件，包括大小，大小，访问时间，等待时间等，以便检查数据库和应用程序的性能瓶颈。如果发现瓶颈，可以通过更改动态参数解决问题，并对性能进行优化。

V$SGA displays summary information about the system global area (SGA).

Column Datatype Description

Column	Datatype	Description
`NAME`	`VARCHAR2(20)`	SGA component group
`VALUE`	`NUMBER`	Memory size (in bytes)
`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

NAME

VARCHAR2(20)

SGA component group

VALUE

NUMBER

Memory size (in bytes)

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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