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ASM Interview Questions
Automatic Storage Management (ASM) is an integrated, high-performance database file system and disk manager. ASM is based on the principle that the database should manage storage instead of requiring an administrator to do it.Within a disk group, Oracle ASM exposes a file system interface for Oracle database files. The content of files that are stored in a disk group is evenly distributed to eliminate hot spots and to provide uniform performance across the disks. The performance is comparable to the performance of raw devices.
- What is the use of ASM (or) Why is ASM preferred over filesystem? …
- What are the init parameters related to ASM? …
- What is rebalancing (or) what is the use of ASM_POWER_LIMIT? …
- What are the different types of redundancies in ASM & explain?
- Simplifies and automates storage management.
- Increases storage utilization and agility.
- Delivers predictable performance, availability and scalability.
- Support database failure in the event of server crash.
- Integrated storage management with ACFS.
What is ASM and how it works?
Automatic Storage Management (ASM) is an integrated, high-performance database file system and disk manager. ASM is based on the principle that the database should manage storage instead of requiring an administrator to do it.
What is the purpose of ASM?
One of the main goals of ASM is to simplify the management of data files, control files, redolog files, archive logs and even RMAN backups. With the introduction of ASM, it became possible for DBAs to manage volumes and file systems themselves, without being dependent on system administrators, using SQL.
What is the advantage of ASM?
With ASM, storage is managed as a small number of storage pools called ASM Disk Groups. Database related files are assigned to ASM Disk Groups and ASM manages the layout and data organization ensuring optimal performance and protection from storage hardware failure.
How does ASM rebalancing work?
Oracle ASM rebalancing operations are controlled by the size of the disks in a disk group. Oracle ASM automatically initiates a rebalance after storage configuration changes, such as when you add, drop, or resize disks. The power setting parameter determines the speed with which rebalancing operations occur.
How does ASM communicate with database?
Any database instance that is using an ASM disk group will contain a background process called OSMB. The OSMB process is responsible for communicating with the ASM instance. The RBAL background process within a database instance, called RBAL just like in the ASM Instance, performs a global open on ASM disks.
What are the advantages of ASM?
- Simplifies and automates storage management.
- Increases storage utilization and agility.
- Delivers predictable performance, availability and scalability.
- Support database failure in the event of server crash.
- Integrated storage management with ACFS.
What is the advantages of ASM in Oracle?
ASM lowers the Oracle database storage total cost of ownership and increases storage utilization while improving performance and availability as compared with traditional file system and volume management solutions. With ASM, less effort is required for managing your database storage environment.
What is the purpose of ASM?
One of the main goals of ASM is to simplify the management of data files, control files, redolog files, archive logs and even RMAN backups. With the introduction of ASM, it became possible for DBAs to manage volumes and file systems themselves, without being dependent on system administrators, using SQL.
What is disadvantages of ASM?
Cons of ASM
Estimated additional time around 4-6 hours for installing and configuring the GI with ASM. Patching is more complex, but with auto feature of opatch tool you can patch Grid Infrastructure, ASM and databases with one GO. The disk storage presented for the ASM consists of more physical devices.
What is ASM process?
ASM Background Process in DB Instance
ASMB performs communication between the database and the ASM instance. RBAL performs the opening and closing of the disks in the disk groups on behalf of Oracle database. This RBAL is the same process as in ASM instance but it performs a different function.
What is power limit in ASM?
The ASM_POWER_LIMIT initialization parameter specifies the default power for disk rebalancing in a disk group. The range of values is 0 to 1024 . The default value is 1 . A value of 0 disables rebalancing.
How can I increase my ASM power limit?
Power limit can be specified when we add or drop disk(s) to/from a diskgroup using ALTER DISKGROUP ADD DISK command. Once rebalance is in progress, you can query v$asm_operation to check the progress of re-balance operation. We can once again use ALTER DISK GROUP command to increase/decrease the power limit.
How can I speed up my ASM rebalance?
- Don’t Overbalance. …
- Power Limit Goes Up To 1024. …
- Avoid The Compact Phase (for Flash Storage Systems)
How do I free up space on ASM?
- Create an ASM Disk Group using the ASM Filter Driver. …
- Create a tablespace in this diskgroup and populate it with some random data.
- Check the space allocated at the database and array level.
- Drop the tablespace and run ASM rebalance.
- Check the space again.
What is the use of ASM_POWER_LIMIT?
ASM_POWER_LIMIT specifies the maximum power on an Oracle ASM instance for disk rebalancing. The higher the limit, the faster rebalancing will complete. Lower values will take longer, but consume fewer processing and I/O resources.
What is ASM used for?
Within a disk group, Oracle ASM exposes a file system interface for Oracle database files. The content of files that are stored in a disk group is evenly distributed to eliminate hot spots and to provide uniform performance across the disks. The performance is comparable to the performance of raw devices.
What is the purpose of ASM?
One of the main goals of ASM is to simplify the management of data files, control files, redolog files, archive logs and even RMAN backups. With the introduction of ASM, it became possible for DBAs to manage volumes and file systems themselves, without being dependent on system administrators, using SQL.
What is the advantage of ASM?
With ASM, storage is managed as a small number of storage pools called ASM Disk Groups. Database related files are assigned to ASM Disk Groups and ASM manages the layout and data organization ensuring optimal performance and protection from storage hardware failure.
What is ASM process?
ASM Background Process in DB Instance
ASMB performs communication between the database and the ASM instance. RBAL performs the opening and closing of the disks in the disk groups on behalf of Oracle database. This RBAL is the same process as in ASM instance but it performs a different function.
How can I tell if a database is using ASM?
- Change to the Oracle Clusterware/Grid Infrastructure home directory: For Oracle RAC 10g Release 2/Oracle RAC 11g Release 1: # cd $CRS_HOME/bin. …
- Verify the status of ASM on all the nodes in the cluster: # ./srvctl status asm ASM instance +ASM1 is running on node galaxy.
References:
Top 46 Oracle ASM Interview Questions – Techgoeasy
ASM Interview questions – DBACLASS DBACLASS
asm Interview Questions and Answers | asm Placement Papers
ASM Interview Questions & Answers « All about Database …
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