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OS commands for RAC

Oracle Database Tips by Donald Burleson


Oracle provides the crs and srvctl command utility for checking on the external status of RAC databases.  For complete details in RAC OS commands, see the bestselling book Oracle Grid & Real Application Clusters


CRS Commands


Oracle provides a host of cluster ready services commands to display details about all services running on the CRS.  These CRS commands include:


CRS Command Function
crs_stat: Displays CRS resource status
crsctl check crs Check CRS status
crsctl stop crs Stops the CRS and all services
crsctl disable crs* Prevents CRS from autostarting on server bounce
crsctl enable crs* Enables CRS autostart on reboot
crs_stop all Stops all registered CRS resources
crs_start all Starts all registered resources



The srvctrl RAC OS Command


The srvctl command replaces the earlier utility 'opsctl' which was used in the parallel server.

The Server Control Utility is a single point of control between the Oracle Intelligent agent and each node in the RAC system. The SRVCTL communicates with the global daemon service (GSD) and resides on each of the nodes.



Here are some working example of svrctl commands for RAC


root> srvctl status nodeapps -n u01

root> srvctl status asm -n u01


root> srvctl status service -d racumup


root> srvctl status database -d racumup


Here are my srvctl notes:


Using CRS commands at the OS level


The CRS (Cluster Ready Services) utility is called crsctl and it queries the cluster details.  Oracle10g introducedCluster Ready Services (CRS), which provides many system management services and interacts with the vendor clusterware to coordinate cluster membership information. It provides the cluster software, sometimes called the Oracle OSD Clusterware.


Oracle 11g release 2 introduced some enhanced crsctl commands to check the CRS status from any RAC node:

root> crsctl stop cluster -all

root> crsctl start cluster -all


root> crsctl check cluster -all


The OUI installs CRS on each node on which the OUI detects that vendor clusterware is running. In addition, the CRS home is distinct from the RAC-enabled Oracle Home.


root> crsctl check crs

Here are my CRS notes:

Oracle Grid and Real Application Clusters

See working examples of Oracle Grid and RAC in the book Oracle Grid and Real Application Clusters.

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