||Oracle Tips by Burleson
Oracle 10g CRS – Cluster Ready Services
Oracle10g introduces Cluster Ready Services
(CRS), which provides many system management services and interacts
with the vendor clusterware to coordinate cluster membership
The OUI installs CRS on each node on which the
OUI detects that vendor clusterware is running. In addition, the CRS
home is distinct from the RAC-enabled Oracle home. The CRS home can
either be shared by one or more nodes, or private to each node,
depending on the settings when you run the OUI. When vendor
clusterware is present, CRS interacts with the vendor clusterware to
coordinate cluster membership information.
For Oracle10g on Linux and Windows-based
platforms, CRS co-exists with but does not inter-operate with vendor
clusterware. You may use vendor clusterware for all UNIX-based
operating systems except Linux.
The Oracle Cluster Registry (OCR) contains
cluster and database configuration information for Real Application
Clusters Cluster Ready Services (CRS), including the list of nodes
in the cluster database, the CRS application, resource profiles, and
the authorizations for the Event Manager (EVM). The OCR can reside
in a file on a cluster file system or on a shared raw device. When
you install Real Application Clusters, you specify the location of
CRS helps to package a set of application work
under CRS control and access the RAC database. The application
resource profile defines the resources with which you manage the RAC.
Prior to the 10g release, the cluster manager
implementations on some platforms were referred to as "Cluster
Manager". In Oracle10g, Cluster Synchronization Services (CSS) is
the cluster manager on all platforms. The Oracle Cluster
Synchronization Service Daemon (OCSSD) performs this function on
UNIX-based platforms. On Windows-based platforms, the
OracleCSService, OracleCRService, and OracleEVMService provide the
cluster manager functionality.
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