Cluster Health Monitor (CHM) FAQ
(Doc ID 1328466.1)
Last updated on JULY 28, 2023
Applies to:
Oracle Database - Enterprise Edition - Version 10.1.0.2 to 12.1.0.2 [Release 10.1 to 12.1]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Purpose
The Cluster Health Monitor FAQ is an evolving document that answers common questions about the Cluster Health Monitor
Questions and Answers
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In this Document
| Purpose |
| Questions and Answers |
| What is the Cluster Health Monitor? |
| What is the purpose of the Cluster Health Monitor? |
| What platform does Cluster Health Monitor support and where can I get the Cluster Health Monitor? |
| What is the resource name for Cluster Health Monitor in 11.2.0.2 or higher? |
| Is stop/start ora.crf affecting clusterware function or cluster database function? |
| Can the Cluster Health Monitor be installed on a single node, non-RAC server? |
| Do Engineered Systems like Exadata have a default usage with CHM and if so, any specific version?? |
| Where is oclumon? |
| How do I collect the Cluster Health Monitor data? |
| Why does “diagcollection.pl --collect --chmos” return “Cannot parse master from output: ERROR : in reading init file” error? |
| How do you get the syntax of different options and explanations for those options for diagcollection.pl and oclumon? |
| What is IPD/OS? |
| How is the Cluster Health Monitor different from OSWatcher? |
| Is the Cluster Health Monitor replacing OSWatcher? |
| How much of overhead does the Cluster Health Monitor cause? |
| Does CHM on Multiple Node configurations (e.g. 4 to 8 nodes) have scaling concerns? |
| Will CDB and PDB result in any new information or special conditions using CHM? |
| How much of disk space is needed for the Cluster Health Monitor? |
| How do I find out the size of data collected and saved by the Cluster Health Monitor in my system? |
| How can I increase the size of the Cluster Health Monitor repository ? |
| What platforms can I run the Cluster Health Monitor? |
| What steps are needed to install 11.2.0.2 when the Cluster Health Monitor from OTN is already running? |
| Where does the Cluster Health Monitor from OTN installed in Linux? |
| What logs and data should I gather before logging a SR for the Cluster Health Monitor error? |
| How do I increase the trace level the Cluster Health Monitor? |
| Can I use procwatcher to get the pstack of the Cluster Health Monitor regularly? |
| What are the processes and components for the Cluster Health Monitor? |
| What is oclumon? |
| What is definition of some of the files like *.bdb, _db.* , *.ldb , log.* files created by tool in the BDB (Berkeley Database) location directory ? |
| Where is the location for the log files for the Cluster Health Monitor from OTN (pre 11.2.0.2)? |
| How do I fix the problem that the time in the oclumon report is in UTC time zone instead of the time zone of my server? |
| Can I install CHM from OTN on 11.2.0.2? What if I stop and disable CHM resource (ora.crf) on 11.2.0.2? |
| Where is the trace file for client like oclumon? How do I increase the trace level for oclumon? |
| Can the Directory path to the CHM Repository be same on all nodes if shared storage is used? |
| How much of data (how long in time) does the node store CHM data locally when it cannot communicate with the master? |
| How often does CHM collect the system metric data? Can this be changed? |
| What is the CHM retention time? |
| How can you reduce the size of bdb file that became big for any reason? |
| Can you set up CHM to run locally on each node? |
| Can CHM be used on a single node non-RAC server? |
| How to start and stop CHM that is installed as a part of GI in 11.2 and higher? |
| What is the reason for following alerts in cluster on all the nodes? |
| <Internal_Only> What does "oclumon showtrail ..." and "oclumon showobjects ..." show? What are the meaning of trail and what are the objects that are listed by showobjects? |
| Database - RAC/Scalability Community |
| References |