What is high availability service in Oracle RAC?

Manage the Oracle Restart or Oracle High Availability Services

Manage the Oracle High Availability Services stack in the Oracle Restart environment which consists of the Oracle High Availability Services daemon
(ohasd), Oracle ASM (if installed), and Cluster Synchronization Services.

Check status of High availability service

crsctl check has


Check startup configuration of Oracle High Availability Service

crsctl config has


Start and stop the Oracle High Availability Service

--For Start the service
crsctl start has
-- For stop the service
crsctl stop has


Enable and disable of Oracle High availability service

-- For enable
crsctl enable has
-- for disable
crsctl disable has


Check release version of Oracle Clusterware software

crsctl query has releaseversion


Check software version of Oracle Clusterware

crsctl query has softwareversion


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If you are using Oracle as the policy and reporting database, you can configure Oracle for high availability using Oracle RAC.Oracle Real Applications Cluster (RAC) is a cluster database based on a shared disc architecture that provides high availability for Oracle databases.

Example: Configuring CA ControlMinder Enterprise Management for High Availability using Oracle RAC

The following example explains how you configure CA ControlMinder Enterprise Management to use Oracle RAC for high availability.

1. Prepare the Oracle database for Enterprise Management.

   You create a user account on the Oracle RAC server and assign the user privileges to install CA ControlMinder Enterprise Management.

2. Implement CA ControlMinder Enterprise Management for high availability.

   Install and configure the Primary and Secondary Enterprise Management Servers.

   Note: Specify the logical name of the Oracle RAC in the Host Name and the shared service name in the Service Name field.

   This daemon is responsible for starting all other Oracle Clusterware processes. It is also responsible for managing and maintaining the OLR.

   In a cluster,the OHAS daemon runs as the root user; in an Oracle Restart environment, it runs as the oracle user.

   The background processes that are now indirectly controlled by the OHAS daemon:
                                                    CRS daemon,
                                                    CSS daemon, and
                                                    EVM daemon.

   The advantage of having the OHAS daemon do this is that the administrator can now issue cluster-wide
   commands. The OHAS daemon will start even if Grid Infrastructure is disabled explicitly.

    OHAS is comprised of the following daemons and services:
   
   • The Grid Plug And Play (GPnP) daemon: This daemon maintains the Grid Plug and Play profile and coordinates distribution of updates across all nodes in the cluster.
                                                                   This helps ensure that all nodes have the current profile. The Grid Plug and Play profile essentially contains sufficient information to start Clusterware..
   • The Grid Interprocess Communication (GIPC) daemon: This daemon is new in Oracle 11gR2. The daemon process is gipcd, and
                                                                                          it supports Grid Infrastructure Communication.
   • The multicast DNS (mDNS) service: This service manages name resolution and service discovery within the cluster. It resolves DNS requests on behalf of the Grid Naming Service (GNS).
   • The Grid Naming Service (GNS): This service performs name resolution within thecluster. It is implemented by the gnsd daemon, and it provides a gateway between
                                                        the cluster mDNS service and the external DNS servers.
   

   Is Oracle RAC high availability?

   "RAC only" architecture uses Real Application Clusters and is an inherently high availability system.

   What is high availability in Oracle database?

   Oracle Database High Availability Oracle is uniquely positioned in the industry by offering customers a comprehensive set of database high availability capabilities that seamlessly work together to help reduce both planned and unplanned downtime.

   How to start Oracle high availability Services?

   Step 1: Prepare the New Cluster Nodes..

   Step 2: Deploy the Oracle Grid Infrastructure Home on the Destination Nodes..

   Step 3: Run the clone.pl Script on Each Destination Node..

   Step 4: Launch the Configuration Wizard..

   How to stop Oracle high availability Services?

   Use the crsctl stop has command to stop Oracle High Availability Services on the local server. Use the crsctl stop crs command to stop Oracle High Availability Services on the local server. For me is the same action about what the commands do. You must use the proper command depending of your environment.