Monitoring ASM Operations in Oracle Database, Using the v$asm_operation
Monitoring ASM Operations in Oracle Database, Using thev$asm_operation
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SQL Code
1select *
2from v$asm_operation
3/
Mount/dismount disk groups
1alter diskgroup all mount
2/
1alter diskgroup data1 mount
2/
1alter diskgroup all dismount
2/
1alter diskgroup data1 dismount
2/
Description of the Oracle Database SQL code:
Here's a description of the Oracle Database SQL code related to ASM operations and diskgroup management:
1. select * from v$asm_operation;
Purpose:
- To retrieve detailed information about ongoing Automatic Storage Management (ASM) operations, including diskgroup mounts, dismounts, rebalances, and other maintenance tasks.
Key Points:
- Provides visibility into the status and progress of ASM operations.
- Useful for monitoring performance, troubleshooting issues, and planning maintenance activities.
2. Diskgroup Mount/Dismount Commands:
alter diskgroup all mount;
- Purpose: Mounts all available diskgroups in the ASM instance, making their data accessible to the database.
alter diskgroup data1 mount;
- Purpose: Mounts a specific diskgroup named
data1
, making its data accessible.
- Purpose: Mounts a specific diskgroup named
alter diskgroup all dismount;
- Purpose: Dismounts all mounted diskgroups, preventing data access and potentially freeing up resources.
alter diskgroup data1 dismount;
- Purpose: Dismounts the specified diskgroup
data1
.
- Purpose: Dismounts the specified diskgroup
Insights and Explanations:
- ASM Operations: ASM manages diskgroups, which are logical collections of disks that provide redundancy and performance benefits.
- Mounting: Diskgroups must be mounted before their data can be used by the database.
- Dismounting: Dismounting makes data inaccessible but can be useful for maintenance or troubleshooting.
- Selective Mounts/Dismounts: You can target specific diskgroups for mounts and dismounts as needed.
- Monitoring and Maintenance: Regularly monitoring ASM operations using
v$asm_operation
can help identify potential issues, plan maintenance activities, and optimize performance. - Privileges: These commands typically require appropriate privileges, such as SYSASM or SYSDBA.
- Impact on Database Access: Diskgroup mounts and dismounts can affect database availability and performance. Exercise caution and consider potential impacts before executing these operations.