Oracle教程 2023-04-03

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

本站中文解释

V$ASM_FILEGROUP_FILE视图提供了ASM文件组中每个文件的状态、大小、路径和其他信息。

用途：

1、检查ASM卷是否正常

可以使用V$ASM_FILEGROUP_FILE视图查看ASM文件组中每个文件的状态，以确定卷是否处于非正常状态，如创建失败、存储空间不足等。

2、跟踪ASM文件组使用情况

通过运行以下查询，可以了解ASM文件组中每个文件的大小和存储空间：

SELECT file_name, file_number, bg_seq, group_number, state, size_allocated, size_free
FROM v$asm_filegroup_file
WHERE group_number = &GROUP_NUMBER;

3、优化磁盘空间使用

通过v$asm_filegroup_file视图可以查看每个ASM文件组中的存储空间大小和空间使用情况，磁盘存储空间的使用效率就可以得到优化。

官方英文解释

V$ASM_FILEGROUP_FILE lists all the Oracle Automatic Storage Management (Oracle ASM) files associated with each File Group.

In both Oracle ASM and Oracle Database instances, V$ASM_FILEGROUP_FILE will display one row for every file associated with a File Group contained in every Disk Group mounted by the instance.

Column	Datatype	Description
`GROUP_NUMBER`	`NUMBER`	Number of the Disk Group in which this File Group exists
`FILEGROUP_NUMBER`	`NUMBER`	Number associated to the File Group within its Disk Group
`FILEGROUP_INCARN`	`NUMBER`	Incarnation number for the File Group
`FILE_NUMBER`	`NUMBER`	Number associated to the ASM File (same file number as in `V$ASM_FILE`)
`INCARNATION`	`NUMBER`	Incarnation number for the ASM File
`COMPOUND_INDEX`	`NUMBER`	A 32-bit number consisting of a Disk Group number in the high-order 8 bits and a File number in the low-order 24 bits (for efficient access to the view)
`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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