Difference in performance between the CTA and INSERT / * + APPEND * / IN

Hi all

I have a question about the ETG and "Insert / * + Append * / Into" statements.

Suite deal, I have a question that I did not understand the difference in operating times EXADATA.

The two tables of selection (g02_f01 and g02_f02) have not any partition. But I could partition tables with the method of partition by column "ip_id" hash and I tried to run the same query with partition tables. Change anything in execution times.

I executed plan gather statistics for all tables. The two paintings were 13.176.888 records. The two arrays have same "ip_id' unique columns. I want to combine these tables into a single table.

First request:

Insert / * + append parallel (a, 16) * / in dg.tiz_irdm_g02_cc one

(ip_id, process_date,...)

Select / * + parallel (a, 16) parallel (16B) * / *.

tgarstg.tst_irdm_g02_f01 a.,

tgarstg.tst_irdm_g02_f02 b

where a.ip_id = b.ip_id


Elapsed = > 45: 00 minutes


Second request:

create table dg.tiz_irdm_g02_cc nologging parallel 16 compress for than query

Select / * + parallel (a, 16) (b, 16) parallel * / *.

tgarstg.tst_irdm_g02_f01 a.,

tgarstg.tst_irdm_g02_f02 b

where a.ip_id = b.ip_id

Elapsed = > 04:00 minutes


Execution plans are:


1. Enter the statement execution Plan:

Hash value of plan: 3814019933

------------------------------------------------------------------------------------------------------------------------------------------

| ID | Operation | Name | Lines | Bytes | TempSpc | Cost (% CPU). Time |    TQ | IN-OUT | PQ Distrib.

------------------------------------------------------------------------------------------------------------------------------------------

|   0 | INSERT STATEMENT.                  |    13 M |    36G |       |   127K (1) | 00:00:05 |        |      |            |

|   1.  LOAD SELECT ACE | TIZ_IRDM_G02_CC |       |       |       |            |          |        |      |            |

|   2.   COORDINATOR OF PX |                  |       |       |       |            |          |        |      |            |

|   5:    PX SEND QC (RANDOM). : TQ10002 |    13 M |    36G |       |   127K (1) | 00:00:05 |  Q1, 02 | P > S | QC (RAND) |

|*  4 |     IN THE BUFFER HASH JOIN |                  |    13 M |    36G |   921 M |   127K (1) | 00:00:05 |  Q1, 02 | SVCP |            |

|   3:      RECEIVE PX |                  |    13 M |    14G |       |  5732 (5) | 00:00:01 |  Q1, 02 | SVCP |            |

|   6.       PX SEND HASH | : TQ10000 |    13 M |    14G |       |  5732 (5) | 00:00:01 |  Q1 00 | P > P | HASH |

|   7.        ITERATOR BLOCK PX |                  |    13 M |    14G |       |  5732 (5) | 00:00:01 |  Q1 00 | ISSUE |            |

|   8.         STORE TABLE FULL ACCESS | TST_IRDM_G02_F02 |    13 M |    14G |       |  5732 (5) | 00:00:01 |  Q1 00 | SVCP |            |

|   9.      RECEIVE PX |                  |    13 M |    21G |       | 18353 (3) | 00:00:01 |  Q1, 02 | SVCP |            |

|  10.       PX SEND HASH | : TQ10001 |    13 M |    21G |       | 18353 (3) | 00:00:01 |  Q1, 01 | P > P | HASH |

|  11.        ITERATOR BLOCK PX |                  |    13 M |    21G |       | 18353 (3) | 00:00:01 |  Q1, 01 | ISSUE |            |

|  12.         STORE TABLE FULL ACCESS | TST_IRDM_G02_F01 |    13 M |    21G |       | 18353 (3) | 00:00:01 |  Q1, 01 | SVCP |            |

------------------------------------------------------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

4 - access("AIRDM_G02_F01".") IP_ID '= 'AIRDM_G02_F02'.' IP_ID")

2 - DEC execution Plan:

Hash value of plan: 3613570869

------------------------------------------------------------------------------------------------------------------------------------------

| ID | Operation | Name | Lines | Bytes | TempSpc | Cost (% CPU). Time |    TQ | IN-OUT | PQ Distrib.

------------------------------------------------------------------------------------------------------------------------------------------

|   0 | CREATE TABLE STATEMENT.                  |    13 M |    36G |       |   397K (1) | 00:00:14 |        |      |            |

|   1.  COORDINATOR OF PX |                  |       |       |       |            |          |        |      |            |

|   2.   PX SEND QC (RANDOM). : TQ10002 |    13 M |    36G |       |   255K (1) | 00:00:09 |  Q1, 02 | P > S | QC (RAND) |

|   3.    LOAD SELECT ACE | TIZ_IRDM_G02_CC |       |       |       |            |          |  Q1, 02 | SVCP |            |

|*  4 |     HASH JOIN |                  |    13 M |    36G |  1842M |   255K (1) | 00:00:09 |  Q1, 02 | SVCP |            |

|   5.      RECEIVE PX |                  |    13 M |    14G |       | 11465 (5) | 00:00:01 |  Q1, 02 | SVCP |            |

|   6.       PX SEND HASH | : TQ10000 |    13 M |    14G |       | 11465 (5) | 00:00:01 |  Q1 00 | P > P | HASH |

|   7.        ITERATOR BLOCK PX |                  |    13 M |    14G |       | 11465 (5) | 00:00:01 |  Q1 00 | ISSUE |            |

|   8.         STORE TABLE FULL ACCESS | TST_IRDM_G02_F02 |    13 M |    14G |       | 11465 (5) | 00:00:01 |  Q1 00 | SVCP |            |

|   9.      RECEIVE PX |                  |    13 M |    21G |       | 36706 (3) | 00:00:02 |  Q1, 02 | SVCP |            |

|  10.       PX SEND HASH | : TQ10001 |    13 M |    21G |       | 36706 (3) | 00:00:02 |  Q1, 01 | P > P | HASH |

|  11.        ITERATOR BLOCK PX |                  |    13 M |    21G |       | 36706 (3) | 00:00:02 |  Q1, 01 | ISSUE |            |

|  12.         STORE TABLE FULL ACCESS | TST_IRDM_G02_F01 |    13 M |    21G |       | 36706 (3) | 00:00:02 |  Q1, 01 | SVCP |            |

------------------------------------------------------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):

---------------------------------------------------

4 - access("AIRDM_G02_F01".") IP_ID '= 'AIRDM_G02_F02'.' IP_ID")

Oracle version:

Oracle Database 11 g Enterprise Edition Release 11.2.0.4.0 - 64 bit Production

PL/SQL Release 11.2.0.4.0 - Production

CORE Production 11.2.0.4.0

AMT for Linux: Version 11.2.0.4.0 - Production

NLSRTL Version 11.2.0.4.0 - Production

Notice how this additional distribution has disappeared from the non-partitioned table.

I think that with the partitioned table that oracle has tried to balance the number of slaves against the number of scores he expected to use and decided to distribute the data to get a 'fair sharing' workload, but had not authorized for the side effects of the buffer hash join which was to appear and extra messaging for distribution.

You could try the indicator pq_distribute() for the insert to tell Oracle that he should not disrtibute like that. for example, based on your original code:

Insert / * + append pq_distribute parallel (a, 16) (a zero) * / in dg.tiz_irdm_g02_cc one...

This can give you the performance you want with the partitioned table, but check what it does to the space allocation that it can introduce a large number (16) of extensions by segment that are not completely filled and therefore be rather waste of space.

Concerning

Jonathan Lewis

Tags: Database

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