Parallel Query Tuning - Expert Oracle RAC Performance Diagnostics and Tuning - page 244

QC

QUEUE

Qref Qref Qref Qref

QUEUE

QUEUE

P3

P2

QUEUE QUEUE

Qref Qref Qref Qref

QUEUE QUEUE

P0 P1

Figure 8-4. Parallel query architecture 2

Beyond the parallel execution of the statement, in-between processes (e.g., sorting, ordering, joining, etc.)
could also be executed in parallel. This kind of operation is called intra-operation parallelism and inter-operation
parallelism.

2 Source: Oracle Corporation