DML 并行查看 parallel

insert /*+ parallel (6) */  into Tabparallel1 select /*+ parallel (6) */ * from Tabparallel

Plan
INSERT STATEMENT  ALL_ROWSCost: 73            
  5 LOAD TABLE CONVENTIONAL RICK.TABPARALLEL1         
    4 PX COORDINATOR        
      3 PX SEND QC (RANDOM) PARALLEL_TO_SERIAL SYS.:TQ10000 :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040     
        2 PX BLOCK ITERATOR PARALLEL_COMBINED_WITH_CHILD :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040    
          1 TABLE ACCESS FULL TABLE PARALLEL_COMBINED_WITH_PARENT RICK.TABPARALLEL :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040  

alter session enable parallel dml;   DML 并行

Plan
INSERT STATEMENT  ALL_ROWSCost: 73              
  6 PX COORDINATOR            
    5 PX SEND QC (RANDOM) PARALLEL_TO_SERIAL SYS.:TQ10000 :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040         
      4 LOAD AS SELECT (HYBRID TSM/HWMB) PARALLEL_COMBINED_WITH_PARENT RICK.TABPARALLEL1 :Q1000     
        3 OPTIMIZER STATISTICS GATHERING PARALLEL_COMBINED_WITH_PARENT :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040      
          2 PX BLOCK ITERATOR PARALLEL_COMBINED_WITH_CHILD :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040    
            1 TABLE ACCESS FULL TABLE PARALLEL_COMBINED_WITH_PARENT RICK.TABPARALLEL :Q1000Cost: 73  Bytes: 9,641,280  Cardinality: 73,040  

 

Plan
UPDATE STATEMENT  ALL_ROWSCost: 561                      
    5 PX COORDINATOR                  
        4 PX SEND QC (RANDOM) PARALLEL_TO_SERIAL SYS.:TQ10000 :Q1000Cost: 561  Bytes: 225,012,320  Cardinality: 2,163,580              
            3 UPDATE PARALLEL_COMBINED_WITH_PARENT RICK.TMP_T0 :Q1000        
                2 PX BLOCK ITERATOR PARALLEL_COMBINED_WITH_CHILD :Q1000Cost: 561  Bytes: 225,012,320  Cardinality: 2,163,580      
                    1 TABLE ACCESS FULL TABLE PARALLEL_COMBINED_WITH_PARENT RICK.TMP_T0 :Q1000Cost: 561  Bytes: 225,012,320  Cardinality: 2,163,580