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Does Oracle RAC require ASM?
For Standard Edition Oracle RAC installations, Oracle ASM is the only supported shared storage option for database or recovery files. You must use Oracle ASM for the storage of Oracle RAC data files, online redo logs, archived redo logs, control files, server parameter file (SPFILE), and the fast recovery area.
What are the prerequisites for RAC setup?
The following are the hardware requirements to properly install Oracle RAC Database 12c Release 2 on a x86_64 system:
- Minimum of 8 GB of RAM for the installation of Oracle Grid Infrastructure.
- Minimum of 1 GB of RAM for the installation of Oracle Database, however 2 GB of memory or more is recommended.
What is ASM RAC?
The Database Configuration Assistant (DBCA) is used in Oracle Database 10g to configure the Automated Storage Management (ASM) features for conventional and Real Application Clusters (RAC) environments. ASM is used to automate and simplify the optimal layout of datafiles, control files, and log files.
Which are the process based on RAC?
Oracle RAC Management Processes (RMSn): The RMSn processes perform manageability tasks for Oracle RAC….Background Processes Specific to Oracle RAC.
| ACMS | Atomic Control File to Memory Service |
|---|---|
| LMON | Global Enqueue Service Monitor |
| LMD | Global Enqueue Service Daemon |
| LMS | Global Cache Service Process |
| LCK0 | Instance Enqueue Process |
How does ASM work in Oracle?
ASM is based on the principle that the database should manage storage instead of requiring an administrator to do it. ASM eliminates the need for you to directly manage potentially thousands of Oracle database files. ASM groups the disks in your storage system into one or more disk groups.
What is ASM instance in Oracle?
An Oracle ASM instance is built on the same technology as an Oracle Database instance. Oracle ASM and database instances require shared access to the disks in a disk group. Oracle ASM instances manage the metadata of the disk group and provide file layout information to the database instances.
What is one node RAC concept?
Oracle Real Application Clusters (RAC) One Node is a new option to the Oracle Database 11g Release 2 Enterprise Edition. It provides enhanced high availability for single-instance databases, protecting from both planned and unplanned downtime.
What is the difference between Oracle RAC and Grid?
Answer: A Grid is not a cluster. The confusion between Grid and RAC is because Oracle redefined “Grid Computing” from it’s original definition. The key distinction between RAC and Grid is in the way the resources are managed: Cluster: RAC (clusters) and all about databases.
How do I know if my ASM is running or not?
Verify the ASM setup
- 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.
Can a asm be used in a RAC environment?
Each ASM instance has either an SPFILE or PFILE type parameter file. To use ASM in the RAC environment we recommend the svrctl commandsas opposed to the Oracle GUI. ASM provides a vertical integration of the file system and volume manager for Oracle database files.
How is Oracle ASM used in RAC clusters?
Using ASM with RAC The Database Configuration Assistant (DBCA) is used in Oracle Database 10g to configure the Automated Storage Management (ASM) features for conventional and Real Application Clusters (RAC) environments. ASM is used to automate and simplify the optimal layout of datafiles, control files, and log files.
Can you use Oracle ASM with raw devices?
Managing raw devices with the native “pp” commands are cumbersome, but you need to understand that while ASM has become the de-facto standard for Oracle, the use of ASM in RAC is somewhat different. For complete details on the nuances of using ASM with RAC, I recommend the book Oracle Grid & Real Application Clusters.
What are the requirements for Oracle 11gR2 RAC?
Below are the Oracle 11gr2 RAC pre-requistes. Hardware Requirements. Network Hardware Requirements. IP Address Requirements. OS and software Requirements. Preparing the server to install Grid Infrastructure. The minimum required RAM is 1.5 GB for grid infrastructure for a cluster, or 2.5 GB for grid infrastructure for a cluster and Oracle RAC.