Enqueue Waits
Waits for enqueue are not specific to RAC environments. However, they have a higher impact in performance than in the single instance environments because the enqueues are globally coordinated. Enqueue management is handled at the Global Enqueue Services (GES) layer, which is responsible for enqueue operations. The initial allocation of the GES resources is based on the following initialization parameters:
DB_FILES
DML_LOCKS
ENQUEUE_RESOURCES ...
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