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RAC Acronyms in Used

Real Application Cluster Acronyms


Global Cache Servicesin memory database containing current locks and awaiting locks, also known as PCM


Global Enqueue Servicescoordinates the requests of all global enqueues uses the GCS, also known as non-PCM


Global Resource Directoryall resources available to the cluster (formed and managed by GCS and GES), see GRDfor more details


Global Resource Managerhelps to coordinate and communicate the locks requests between Oracle processes


Global Services Daemonruns on each node with one GSD process per node. The GSD coordinates with the cluster manager to receive requests from clients such as the DBCA, EM, and the SRVCTL utility to execute administrative job tasks such as instance startup or shutdown. The GSD is not an Oracle instance background process and is therefore not started with the Oracle instance


Parallel Cache Managementformly know as (integrated) Distributed Lock Manager, its another name for GCS


n/ait is a identifiable entity it basically has a name or a reference, it can be a area in memory, a disk file or an abstract entity

Resource (Global)

n/aa resource that can be accessed by all the nodes within the cluster examples would be the following

Data Buffer Cache Block

Transaction Enqueue

Database Data Structures


Lock Value Blockcontains a small amount of data regarding the lock


Traffic Controllercontrols the DLM traffic between instances (messaging tickets)



About Syed Saad Ali

As a certified and experienced Oracle Database Administrator with Almost 10 Years of Experience I am able to perform all levels of database maintenance and am fully qualified to do Oracle updates as well. Capitalizing on my interest in Business & IT both, I chose to navigate my career towards Enterprise Solutions, which has enabled me to excel in the combination of both. I have developed exceptional analytical skills that allow me to diagnose and take care of issues immediately. Extremely skilled in planning and execution of special projects in time- critical environments. Extensive knowledge in directing, coordinating and exercising concern authority for planning, organization, control and successful completions. Very skilled at solving customer relations issues by seeking first to understand and then to be understood. Effectively able to communicate with customers, vendors and management.

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