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Real Application Cluster Acronyms
GCS |
Global Cache Services | in memory database containing current locks and awaiting locks, also known as PCM |
GES |
Global Enqueue Services | coordinates the requests of all global enqueues uses the GCS, also known as non-PCM |
GRD |
Global Resource Directory | all resources available to the cluster (formed and managed by GCS and GES), see GRDfor more details |
GRM |
Global Resource Manager | helps to coordinate and communicate the locks requests between Oracle processes |
GSD |
Global Services Daemon | runs 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 |
PCM (IDLM) |
Parallel Cache Management | formly know as (integrated) Distributed Lock Manager, its another name for GCS |
Resource |
n/a | it 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/a | a 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 |
LVB |
Lock Value Block | contains a small amount of data regarding the lock |
TRFC |
Traffic Controller | controls the DLM traffic between instances (messaging tickets) |
