1. User’s Guide
  2. Proactively Detecting and Diagnosing Performance Issues for Oracle RAC
  3. Monitoring the Oracle Real Application Clusters (Oracle RAC) Environment with Oracle Cluster Health Advisor

5.2 Monitoring the Oracle Real Application Clusters (Oracle RAC) Environment with Oracle Cluster Health Advisor

Oracle Cluster Health Advisor is automatically provisioned on each node by default when Oracle Grid Infrastructure is installed for Oracle Real Application Clusters (Oracle RAC) or Oracle RAC One Node database.

Oracle Cluster Health Advisor does not require any additional configuration. The credentials of OCHAD daemon user in the Grid Infrastructure Management Repository (GIMR), are securely and randomly generated and stored in the Oracle Grid Infrastructure Credential Store.

When Oracle Cluster Health Advisor detects an Oracle Real Application Clusters (Oracle RAC) or Oracle RAC One Node database instance as running, Oracle Cluster Health Advisor autonomously starts monitoring the cluster nodes. Use CHACTL while logged in as the Grid user to turn on monitoring of the database.

To monitor the Oracle Real Application Clusters (Oracle RAC) environment:

  1. To monitor a database, run the following command:
    $ chactl monitor database –db db_unique_name

    Oracle Cluster Health Advisor monitors all instances of the Oracle Real Application Clusters (Oracle RAC) or Oracle RAC One Node database using the default model. Oracle Cluster Health Advisor cannot monitor single-instance Oracle databases, even if the single-instance Oracle databases share the same cluster as Oracle Real Application Clusters (Oracle RAC) databases.

    Oracle Cluster Health Advisor preserves database monitoring status across cluster restarts as Oracle Cluster Health Advisor stores the status information in the GIMR. Each database instance is monitored independently both across Oracle Real Application Clusters (Oracle RAC) database nodes and when more than one database run on a single node.

  2. To stop monitoring a database, run the following command:
    $ chactl unmonitor database –db db_unique_name

    Oracle Cluster Health Advisor stops monitoring all instances of the specified database. However, Oracle Cluster Health Advisor does not delete any data or problems until it is aged out beyond the retention period.

  3. To check monitoring status of all cluster nodes and databases, run the following command:
    $ chactl status

    Use the –verbose option to see more details, such as the models used for the nodes and each database.