Oracle教程 2023-04-03

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

Oracle视图V$IOS_CLIENT是在Oracle数据库中运行的Oracle I/O服务器和客户端之间的多路操作的一种特殊的共享内存结构，可用于查看客户端和服务器之间的I/O流量数据。

您可以使用它来检查客户端连接的性能，检查客户端的响应时间，查看客户端有多少存储空间来缓存I/O数据，并查看客户端当前正在收发的I/O数据的状态，如收发缓冲区大小。

要使用V，$IOS_CLIENT，首先需要在客户端和服务器上分别启动两个实例并连接到相同的Oracle数据库，然后使用以下SQL语句来查询视图：

SELECT * FROM v$ios_client;

这将返回客户端当前的I/O流量数据信息，其中包括客户端缓冲区大小、I/O活动状态、活动状态数量、收发次数以及其他信息。

V$IOS_CLIENT provides more information about IO Server clients.

Column	Datatype	Description
`CLIENT_ID`	`NUMBER`	The unique ID for this client instance
`CLUSTER_ID`	`VARCHAR2(33)`	The GUID of the cluster where the client instance is running
`CLUSTER_NAME`	`VARCHAR2(16)`	When the query is executed on an Oracle IOServer (IOS) instance, this column shows the name of the cluster where the client (database) instance is running. When the query is executed on a database instance, this column shows the name of the cluster where the IOS instance that the database is connected to is running.
`NODE`	`NUMBER`	Number of the node within the cluster where the client instance is running
`INSTANCE_NAME`	`VARCHAR2(64)`	Instance name of the database client instance
`DB_NAME`	`VARCHAR2(64)`	Database name of the database client instance
`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 multitenant container database (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

Note:

In an Oracle Database instance, this view returns 0 rows when queried from a PDB.

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