How can I check RAC resource status?
Shutdown and Start sequence of Oracle RAC
- To start and stop oracle cluster resources running on all nodes :
- To check the current status of a cluster : [[email protected]~]$ crsctl check cluster CRS-4537: Cluster Ready Services is online CRS-4529: Cluster Synchronization Services is online CRS-4533: Event Manager is online.
How do you find the number of nodes in a cluster?
1 Answer
- Here is the simple formula to find the number of nodes in Hadoop Cluster?
- N = H / D.
- where N = Number of nodes.
- H = HDFS storage size.
- D = Disk space available per node.
- Consider you have 400 TB of the file to keep in Hadoop Cluster and the disk size is 2TB per node.
- Number of nodes required = 400/2 = 200.
What is startup sequence in Oracle 11g RAC?
Brief explanation of the startup sequence. The init tab file is the one it triggers oracle high availability service daemon. When a node of an Oracle Clusterware cluster starts, OHASD is started by platform-specific means like init. d in Linux. OHASD is the root for bringing up Oracle Clusterware.
What is resource in Oracle RAC?
Resources for Oracle RAC database instances enable the database instances to be administered from Sun Cluster. If you are using Oracle 10g Release 2 or 11g RAC, these resources also enable Sun Cluster and Oracle Cluster Ready Services (CRS) to interoperate.
How do I find my Oracle instance ID?
Answer: You can retrieve the instance name and database name using the sys_context function.
What is Srvctl?
The Server Control (SRVCTL) utility is installed on each node by default. You can use SRVCTL to start and stop the database and instances, manage configuration information, and to move or remove instances and services. You can also use SRVCTL to add services.
What is the olsnodes command?
This section contains topics which relate to using the OLSNODES command. The olsnodes command provides the list of nodes and other information for all nodes participating in the cluster. You can use this command to quickly check that your cluster is operational, and all nodes are registered as members of the cluster.
How do I use olsnodes in CRS?
This command utility is located in the $ORA_CRS_HOME/bin directory. You can only use this command if the CRS daemon is started. You can run this command as either the root user, the user that installed Oracle Clusterware, or the user that installed Oracle Database. The olsnodes command does not use keywords, but accepts one or more options.
Why can’t I run olsnodes?
If olsnodes cannot be run, then something is definitely wrong! Running olsnodes in its basic form with no parameters simply shows a list of nodes in the cluster: Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.
