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Oracle’ın Parallel Execution Yetenekleri ve Performans İncelemesi

Emrah METE

TURKCELL TEKNOLOJİ

Emrah METE

Marmara Üniversitesi

Bilgisayar Teknolojisi ve Programlama

Yıldız Teknik Üniversitesi

Bilgisayar Mühendisliği

Turkcell Teknoloji

Yazılım Geliştirme Uzmanı

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İçerik

• Parallel Execution Nedir?

• Neden Parallel Execution Kullanırız?

• Parallel Execution Ne Zaman Kullanmalıyız?

• Oracle’ın Parallel Execution Yetenekleri

– Parallel Query

– Parallel DML

– Parallel DDL

– Procedural Parallelism

– Oracle 11g New Features

• dbms_parallel_execute

• Auto DoP ve PSQ

Parallel Execution ?

Neden Parallel Execution Kullanırız?

• Seri çalışan çok büyük görevleri paraleleştirerek daha hızlı ve performanslı sonuçlar almak için kullanırız.

HIZ + PERFORMANS !

Parallel Execution Ne Zaman Kullanmalıyız?

1 – Paralel çalıştıracağımız görev büyük bir işlem olmalı(Ör: 50 GB’lık bir datayı load etmek.) (OLAP/OLTP)

2- Sistemimizin donanım karakteristiğinin parallel execution yapmaya yeterli olması gerekir.

3- Parallel Execution yapmak için sistemimizde yeterli available kaynakların olması gerekir.

Oracle’ın Parallel Execution Yetenekleri

• Parallel Query

• Parallel DML (PDML)

• Parallel DDL

• Procedural Parallelism

• Oracle 11g New Features

– Auto DoP ve PSQ (Parallel Statement Queue)

– DBMS_PARALLEL_EXECUTION

Parallel Query

• select count(status) from big_table

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

Parallel DML (PDML)

• Insert – Update – Delete – Merge

ORA-12838: cannot read/modify an object after modifying it in parallel.

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

Parallel DDL

• CREATE INDEX

• CREATE TABLE AS SELECT

• ALTER INDEX REBULD

• ALTER TABLE MOVE

• ALTER TABLE SPLIT|COALESCE PARTITION

• ALTER INDEX SPLIT PARTITION

• Create Table big_table as Select ....

Parallel DDL

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

Procedural Parallelism

• Selecting Rows

• Processing them

• Insert/ Update another table

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

Procedural Parallelism Parallel Pipelined Function

Unparallelized, Unpipelined Table Functions

Pipelining and Parallel Execution

Procedural Parallelism

• Select * from table(dbms_xplan.display);

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

DBMS_PARALLEL_EXECUTE (Do it yourself parallesim)

<<Expert, Oracle Database Architecture 11g,10g,9i>> Tom KYTE (2010)

DBMS_PARALLEL_EXECUTE (Do it yourself parallesim)

Automatic Degree of Parallelism (Auto DoP)

PARALLEL_DEGREE_POLICY PARALLEL_DEGREE_LIMIT PARALLEL_MIN_TIME_THRESHOLD DOP = PARALLEL_THREADS_PER_CPU x CPU_COUNT x INSTANCE_COUNT (DEFAULT)

https://blogs.oracle.com/datawarehousing/entry/auto_dop_and_parallel_statemen

Parallel Statement Queue (PSQ)

https://blogs.oracle.com/datawarehousing/entry/auto_dop_and_parallel_statemen

Kaynaklar

• «Expert, Oracle Database Architecture 11g,10g,9i» Tom KYTE (2010)

• tahiti.oracle.com

• Oracle 11g Release 2 New Features Guide

• Oracle 11g Release 2 Concept Guide

• Oracle Datawarehouse Guide

• blogs.oracle.com

– The Datawarehouse Insider, Auto DOP and Parallel Statement Queuing

• Oracle Technology Network

- On Working in Parallel By Steven Feuerstein

- Automating Parallelism By Arup Nanda

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