Coordinates parallel statement execution
This operation is implemented in the following versions
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This example was developed using Oracle 10.2.0.1 on Linux
This example requires the following table definitions
CREATE TABLE t1 ( c1 NUMBER, c2 NUMBER ) PARALLEL 2;
The statement
SELECT COUNT(*) FROM t1;
generates the following execution plan
0 SELECT STATEMENT Optimizer=CHOOSE 1 0 SORT (AGGREGATE) 2 1 PX COORDINATOR 3 2 PX SEND (QC (RANDOM)) 4 3 SORT (AGGREGATE) 5 4 PX BLOCK ITERATOR 6 5 TABLE ACCESS (FULL) OF 'T1'