Which three statements are true concerning diagnostic components and requirements of Oracle 12c Clusterware?
A.
There is one ologgered service for the cluster health monitor (CHM) on each cluster node regardless of cluster size.
B.
The Grid Infrastructure Management Repository database must run on a hub node if Flex Clusters are used.
C.
There is one osysmond service for the cluster health monitor (CHM) on each cluster node regardless of cluster size.
D.
The oclumon utility may be used to get and set parameters for the cluster health monitor (CHM) repository.
E.
The diagcollection.pl script must be run from the Grid home directory as the Grid infrastructure owner
F.
The clusterware log files are stored inside the Grid Infrastructure Management Repository database used by the cluster health monitor (CHM).
Correct: B, C & D
“A” is wrong:
Cluster Logger Service – There is one cluster logger service (OLOGGERD) for every 32 nodes in a cluster. Another OLOGGERD is spawned for every additional 32 nodes (which can be a sum of Hub and Leaf Nodes). If the cluster logger service fails (because the service is not able come up after a fixed number of retries or the node where it was running is down), then Oracle Clusterware starts OLOGGERD on a different node. The cluster logger service manages the operating system metric database in the Oracle Grid Infrastructure Management Repository.
“B” and “D” is right!
Oracle Grid Infrastructure Management Repository – The Oracle Grid Infrastructure Management Repository:
■ Is an Oracle database that stores real-time operating system metrics collected by CHM. You configure the Oracle Grid Infrastructure Management Repository during an installation of or upgrade to Oracle Clusterware 12c on a cluster.
Runs on one node in the cluster (this must be a Hub Node in an Oracle Flex Cluster configuration), and must support failover to another node in case of node or storage failure.
You can locate the Oracle Grid Infrastructure Management Repository on the same node as the OLOGGERD to improve performance and decrease private network traffic.
■ Communicates with any cluster clients (such as OLOGGERD and OCLUMON) through the private network. Oracle Grid Infrastructure Management Repository communicates with external clients over the public network, only.
■ Data files are located in the same disk group as the OCR and voting file.
If OCR is stored in an Oracle ASM disk group called +MYDG, then configuration scripts will use the same disk group to store the Oracle Grid Infrastructure Management Repository.
Oracle increased the Oracle Clusterware shared storage requirement to accommodate the Oracle Grid Infrastructure Management Repository, which can be a network file system (NFS), cluster file system, or an Oracle ASM disk group.
■ Size and retention is managed with OCLUMON.
“C” is correct!
System Monitor Service – There is one system monitor service on every node. The system monitor service (osysmond) is a real-time, monitoring and operating system metric collection service that sends the data to the cluster logger service. The cluster logger service receives the information from all the nodes and persists in an Oracle Grid Infrastructure Management Repository database.
“E” is wrong!
Run the following command from a writable directory outside the Grid home as a privileged user on the cluster logger service node to collect all the available data in the Oracle Grid Infrastructure Management Repository:
# Grid_home/bin/diagcollection.pl –collect
“F” is wrong, i can use RAC 12c without this