並行與hint同時存在
阿新 • • 發佈：2018-08-24
lap distrib ack bsp statement service amp int wait
1.指定並行度為3
select /*+ parallel(t1,3) */ object_type,count(*) from PARALLEL_TEST1 t1 group by object_type order by count(*); select /*+ parallel(t1,3) */ object_type,count(*) from PARALLEL_TEST1 t1 group by object_type order by count(*);SQL> OBJECT_TYPE COUNT(*) --------------------------------------------------------------------- ---------- EDITION 1 RULE 2 DESTINATION 2 JAVA SOURCE 2 SCHEDULE 4 SCHEDULER GROUP 4 LOB PARTITION 7 DIRECTORY 7 INDEXTYPE 7 UNIFIED AUDIT POLICY 8 WINDOW 9 CLUSTER 10 CONTEXT 10 PROGRAM 10 RESOURCE PLAN 11 EVALUATION CONTEXT 12 JOB CLASS 14 UNDEFINED 15 CONSUMER GROUP 18 RULE SET 18 JOB 23 QUEUE 25 TABLE SUBPARTITION 32 XML SCHEMA 44 OPERATOR 54 INDEX PARTITION 187 PROCEDURE 201 LIBRARY 228 TYPE BODY 229 SEQUENCE 254 TABLE PARTITION 258 JAVA DATA 309 FUNCTION 346 TRIGGER 593 LOB 857 JAVA RESOURCE 1015 PACKAGE BODY 1245 PACKAGE 1306 TABLE 2388 TYPE 2536 INDEX 4268 VIEW 6487 JAVA CLASS 30816 SYNONYM 37081 44 rows selected. Execution Plan ---------------------------------------------------------- Plan hash value: 4204599738 --------------------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib | --------------------------------------------------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 82500 | 1047K| 159 (4)| 00:00:01 | | | | | 1 | PX COORDINATOR | | | | | | | | | | 2 | PX SEND QC (ORDER) | :TQ10002 | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,02 | P->S | QC (ORDER) | | 3 | SORT ORDER BY | | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,02 | PCWP | | | 4 | PX RECEIVE | | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,02 | PCWP | | | 5 | PX SEND RANGE | :TQ10001 | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,01 | P->P | RANGE | | 6 | HASH GROUP BY | | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,01 | PCWP | | | 7 | PX RECEIVE | | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,01 | PCWP | | | 8 | PX SEND HASH | :TQ10000 | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,00 | P->P | HASH | | 9 | HASH GROUP BY | | 82500 | 1047K| 159 (4)| 00:00:01 | Q1,00 | PCWP | | | 10 | PX BLOCK ITERATOR | | 82500 | 1047K| 155 (1)| 00:00:01 | Q1,00 | PCWC | | | 11 | TABLE ACCESS FULL| PARALLEL_TEST1 | 82500 | 1047K| 155 (1)| 00:00:01 | Q1,00 | PCWP | | --------------------------------------------------------------------------------------------------------------------------- Note ----- - dynamic statistics used: dynamic sampling (level=2) - Degree of Parallelism is 3 because of table property Statistics ---------------------------------------------------------- 26 recursive calls 0 db block gets 1941 consistent gets 107 physical reads 0 redo size 1834 bytes sent via SQL*Net to client 573 bytes received via SQL*Net from client 4 SQL*Net roundtrips to/from client 4 sorts (memory) 0 sorts (disk) 44 rows processed DBMS_SQLTUNE.REPORT_SQL_MONITOR(SESSION_ID=>40) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ SQL Monitoring Report SQL Text ------------------------------ select /*+ parallel(t1,3) */ object_type,count(*) from PARALLEL_TEST1 t1 group by object_type order by count(*) Global Information ------------------------------ Status : DONE (ALL ROWS) Instance ID : 1 Session : SYS (40:34283) SQL ID : 84vj8sv8vuxja SQL Execution ID : 16777216 Execution Started : 08/24/2018 11:09:37 First Refresh Time : 08/24/2018 11:09:37 Last Refresh Time : 08/24/2018 11:09:37 Duration : .024032s Module/Action : sqlplus@12c1 (TNS V1-V3)/- Service : dayupdb1 Program : sqlplus@12c1 (TNS V1-V3) Fetch Calls : 4 Global Stats ====================================================================================== | Elapsed | Cpu | IO | Cluster | Other | Fetch | Buffer | Read | Read | | Time(s) | Time(s) | Waits(s) | Waits(s) | Waits(s) | Calls | Gets | Reqs | Bytes | ====================================================================================== | 0.09 | 0.06 | 0.01 | 0.01 | 0.02 | 4 | 1813 | 13 | 856KB | ====================================================================================== Parallel Execution Details (DOP=3 , Servers Allocated=6) Instances : 2 ========================================================================================================================================== | Instance | Name | Type | Server# | Elapsed | Cpu | IO | Cluster | Other | Buffer | Read | Read | Wait Events | | | | | | Time(s) | Time(s) | Waits(s) | Waits(s) | Waits(s) | Gets | Reqs | Bytes | (sample #) | ========================================================================================================================================== | 1 | PX Coordinator | QC | | 0.02 | 0.01 | | | 0.01 | 5 | | . | | | 1 | p000 | Set 1 | 1 | 0.02 | 0.01 | 0.00 | 0.00 | 0.00 | 752 | 3 | 128KB | | | 1 | p001 | Set 1 | 2 | 0.02 | 0.01 | 0.00 | 0.00 | 0.01 | 658 | 3 | 112KB | | | 2 | p000 | Set 1 | 3 | 0.02 | 0.01 | 0.01 | 0.00 | | 398 | 7 | 616KB | | | 1 | p002 | Set 2 | 1 | 0.00 | 0.00 | | | | | | . | | | 1 | p003 | Set 2 | 2 | 0.00 | 0.00 | | | 0.00 | | | . | | | 2 | p001 | Set 2 | 3 | 0.00 | 0.00 | | | | | | . | | ========================================================================================================================================== Instance Drill-Down ================================================================================================================================ | Instance | Process Names | Elapsed | Cpu | IO | Cluster | Other | Buffer | Read | Read | Wait Events | | | | Time(s) | Time(s) | Waits(s) | Waits(s) | Waits(s) | Gets | Reqs | Bytes | | ================================================================================================================================ | 1 | QC p000 p001 p002 p003 | 0.07 | 0.04 | 0.01 | 0.00 | 0.02 | 1415 | 6 | 240KB | | | 2 | p000 p001 | 0.02 | 0.02 | 0.01 | 0.00 | | 398 | 7 | 616KB | | ================================================================================================================================ SQL Plan Monitoring Details (Plan Hash Value=4204599738) ==================================================================================================================================================================== | Id | Operation | Name | Rows | Cost | Time | Start | Execs | Rows | Read | Read | Mem | Activity | Activity Detail | | | | | (Estim) | | Active(s) | Active | | (Actual) | Reqs | Bytes | (Max) | (%) | (# samples) | ==================================================================================================================================================================== | 0 | SELECT STATEMENT | | | | 1 | +0 | 7 | 44 | | | | | | | 1 | PX COORDINATOR | | | | 1 | +0 | 7 | 44 | | | | | | | 2 | PX SEND QC (ORDER) | :TQ10002 | 82500 | 159 | 1 | +0 | 3 | 44 | | | | | | | 3 | SORT ORDER BY | | 82500 | 159 | 1 | +0 | 3 | 44 | | | 6144 | | | | 4 | PX RECEIVE | | 82500 | 159 | 1 | +0 | 3 | 44 | | | | | | | 5 | PX SEND RANGE | :TQ10001 | 82500 | 159 | 1 | +0 | 3 | 44 | | | | | | | 6 | HASH GROUP BY | | 82500 | 159 | 1 | +0 | 3 | 44 | | | 5M | | | | 7 | PX RECEIVE | | 82500 | 159 | 1 | +0 | 3 | 105 | | | | | | | 8 | PX SEND HASH | :TQ10000 | 82500 | 159 | 1 | +0 | 3 | 105 | | | | | | | 9 | HASH GROUP BY | | 82500 | 159 | 1 | +0 | 3 | 105 | | | 6M | | | | 10 | PX BLOCK ITERATOR | | 82500 | 155 | 1 | +0 | 3 | 90953 | | | | | | | 11 | TABLE ACCESS FULL | PARALLEL_TEST1 | 82500 | 155 | 1 | +0 | 39 | 90953 | 13 | 856KB | | | | ====================================================================================================================================================================
並行與hint同時存在