Every Oracle Standalone Cluster and Oracle Domain Services Cluster contains a Grid Infrastructure Management Repository (GIMR), or the Management Database (MGMTDB).
The Grid Infrastructure Management Repository (GIMR) is a multitenant database with a pluggable database (PDB) for the GIMR of each cluster. The GIMR stores the following information about the cluster:
Real time performance data the Cluster Health Monitor collects
Fault, diagnosis, and metric data the Cluster Health Advisor collects
Cluster-wide events about all resources that Oracle Clusterware collects
CPU architecture data for Quality of Service Management (QoS)
Metadata required for Rapid Home Provisioning
The Oracle Standalone Cluster locally hosts the GIMR on an Oracle ASM disk group; this GIMR is a multitenant database with a single pluggable database (PDB).
The global GIMR runs in an Oracle Domain Services Cluster. Oracle Domain Services Cluster locally hosts the GIMR in a separate Oracle ASM disk group. Client clusters, such as Oracle Member Cluster for Database, use the remote GIMR located on the Domain Services Cluster. For two-node or four-node clusters, hosting the GIMR for a cluster on a remote cluster reduces the overhead of running an extra infrastructure repository on a cluster. The GIMR for an Oracle Domain Services Cluster is a multitenant database with one PDB, and additional PDB for each member cluster that is added.
When you configure an Oracle Domain Services Cluster, the installer prompts to configure a separate Oracle ASM disk group for the GIMR, with the default name as MGMT.