DOAG 2015 . DB2 SHOOTOUT · PDF filePL/SQL and ABAP/4 Know How ... Dilbert Barfriend Dilbert Barfriend Dil 3 friend Norbert 3 Nick King 22 2 Uncompressed 1 Robert Ba 2 Nick 3 Bert

Copyright © 2015 ITGAIN GmbH 1

ORACLE VS. DB2 SHOOTOUT

DOAG 2015

Oracle vs. DB2 Shootout


INTRODUCTION

Today in the blue corner:

Robert Barić

Oracle KnowHow since 9i/10g

DB2 KnowHow since 9.1

Development Know How

6 years with ITGAIN

Specialized in Performance Tuning andBackup/Recovery

Anytime in the red corner:

Gerret Bachmann

Oracle KnowHow since 8i

Had learned COBOL long ago

PL/SQL and ABAP/4 Know How

4 years with ITGAIN

Specialized in Performance Tuning


Why do we compare ?

Who are we ?


A RICH SET OF SIMILAR FEATURES


Partioning

Compression

Online Backup

„Remote“ DB access

Trigger

Programming language

Online Reorg

XML / JSON

CBO / statistics

Column Organized Tables

RDBMS

ACID

Standby Database

Cluster Database

Parallel Processing

.. And many more


SHARED HISTORY


1970 1975 1980 1985 1990 1995 2000 2005 2010 2015

Research study byEdgar F. Coddby order of IBM: DB-Prototype System R

First Installation

DB2 for MVS

Announcement DB2 für OS/2

OS/2 Database

DB2 for Windows

8i (CBO, Java VM, Unicode, LOBs)

9i (Flashback, SPFile)

10g (ASM, ADDM)

V7 (Unicode, SQL/PL)

V8 (Partitioning)

V9.7 (Cursor Stability)

V10 (Opt. Parallel.)

11g (Adv. Comp.)

12cV2 (1st Version)

V4 (Read Consistency)


DB2: DATA PARTITIONING FEATURE (DPF )


SELECT dept, SUM(sal)

FROM emp

GROUP BY dept

Coordinator


DPF: TABLESPACE AND TABLE CREATION

CREATE DATABASE PARTITION GROUP D1PG

ON DBPARTITIONNUMS (1, 2, 3, 4, 5, 6, 7);

CREATE LARGE TABLESPACE DPF_TBSP1

IN DATABASE PARTITION GROUP D1PG

PAGESIZE 16384

MANAGED BY DATABASE;

CREATE TABLE EMPLOYEE (

EMP_ID VARCHAR(50) NOT NULL,

EMP_FIRST_NAME VARCHAR(50) NOT NULL,

EMP_LAST_NAME VARCHAR(50) SMALLINT,

ROW_INSERT_TMSTMP TIMESTAMP)

DISTRIBUTE BY HASH (EMP_ID)

IN DPF_TBSP1

INDEX IN DPF_TBSP1_IX;



DATAGUARD VS HADR (STANDBY)

On Standby only Dirty Reads

No Backup on Standby

Max. 3 Standby databases


Primary Database

StandbyDatabase

Clients Clients

Data Changes

Primary Site StandbySite

DB2Oracle

On Standby Consistent Reads

Backup on Standby

Max. 30 Standby databases


DB2: ISOLATION LEVEL „UNCOMMITTED READ“


T1

T2

SELECT NAME

FROM CUST

WHERE ID = 1337;

UPDATE CUST

SET NAME = 'Tom'

WHERE ID = 1337;

Thinks about

COMMIT or

ROLLBACK…

CUST

ID = 1337

NAME = 'Thomas'

CUST

ID = 1337

NAME = 'Tom'

SELECT NAME

FROM CUST

WHERE ID = 1337

WITH UR;

CUST

ID = 1337

NAME = 'Tom'


RAC VS. PURESCALE: ARCHITECTURE


Member

CF CF

CF CF

Cluster-Caching facilities (CF)Global Locking + Page Cache

Primary CF Secondary CF

Members with integrated CF


Header

Row 4

Row 2

Row 1

ITL Slot 1

Row 3

ITL Slot 2

ITL Slot 3

UPDATE … WHERE ROW=1;



UPDATE … WHERE ROW=4;ITL Slot 4

Row 5UPDATE … WHERE ROW=5; ITL waits

ALTER TABLE…

INITRANS=10

ORACLE LOCKING

ITL-slots on block level per session

Number of slots grows with table


Session 1

Session 2

Session 3

Session 4


DB2 NIGHTMARE: „LOCK ESCALATION“


Lock Manager Lock Manager








4

2

1

3

8

6

5

7

12

10

9

11

Table SHOOTOUT

1 2 3 4 8Table SHOOTOUT

DML Wait


TABLE COMPRESSION

1 Bachmann

1 Baric

2

chmann

ric

Nor man

Oracle DB2

1

1

2

Robert Bachmann

Robert Baric

Nick King

Norbert Barman

Dilbert Barfriend friendDilbert Barfriend Dil 3

3Norbert Barman

2 2Nick King 2

2

Uncompressed

1 Robert Ba

Nick2

3 Bert Bar


1 Robert

2 Nick King King


DB2

Oracle

TABLE / BLOCK DICTIONARY

Titel des Foliensatzes

Block 1 Block 2 Block 3

Norbert Norbert Norbert

Page 1 Page2 Page3

1 1 11 Norbert

Table Dictionary


INDEX COMPRESSION DB2

Variable Slot Directory

Prefix Compression (from beginning byte-values)

RID (RowID) Compression


Compress

Fixed Slot Dir

Tom, Tall 102030

Tom, Thin

102032

102035

Index Keys RID

Var. Slot Dir

~1all 102030

~1hin

2

102035

Index Keys RID

~1=Tom, T Symbols

Page (Block) Page (Block)


RIDDLE: WHAT HAPPENS?

CREATE TABLE RIDDLE(

ID INTEGER,

TEXT CHAR (20));

INSERT INTO RIDDLE VALUES (1, 'Now what?');

ROLLBACK;

SELECT * FROM RIDDLE;

0 rows found Table not found

DDL can be rolled back!

ORACLE: DB2:



DB2: REORG PENDING STATE

Change last month

ALTER TABLE RIDDLE

ALTER COLUMN TEXT SET DATA TYPE VARCHAR(30); COMMIT;

Change last week

ALTER TABLE RIDDLE


Change today

ALTER TABLE RIDDLE


Table switches to „reorg pending state“

Cannot be used until reorg is done

Can take a while…

„3 STRIKES“:



ORACLE COMPATIBILITY MODE

$> DB2SET DB2_COMPATIBILITY_VECTOR = ORA

$> DB2SET DB2_DEFERRED_PREPARE_SEMANTICS = YES

$> db2stop; db2start

$> db2 "create database testdb PAGESIZE 32 K"

$> db2 connect to testdb;


Oracle SQL syntax supported

PL/SQL support with oracle data type

Similiar behivour adjustable


ORACLE COMPATIBILITY MODE („98% COMPATIBLE“)

Oracle

SQL> INSERT INTO

<table> AS

SELECT LEVEL FROM DUAL

CONNECT BY LEVEL <

10000;

10.000 rows inserted

SYS.DBMS_ Packages: 554

SYS.UTL_ Packages: 21

V$ Views: 768

DB2

$> db2 INSERT INTO

<TABLE> AS

SELECT LEVEL FROM DUAL

CONNECT BY LEVEL <

10000;

ERROR: (Max recursion 64)

SYS.DBMS_ Packages: 8

SYS.UTL_ Packages: 4

V$ Views: ?

No Oracle Tools (DP, sqlldr)



GENERATION OF CSV-FILES

Oracle SQL*Plus

SQL> SET PAGESIZE 0

SQL> SET LINESIZE 1000

SQL> SET COLSEP ','

SQL> SPOOL export.csv

SQL> SELECT * FROM …

SQL> SPOOL OFF

SQL Developer SELECT /*csv*/ *

FROM <table>;

SET SQLFORMAT csv

Run as script

DB2

$> db2 "select *

from cust where … " |

grep … > records.txt

$> db2 EXPORT TO

export.csv of DEL

SELECT * FROM CUST


1, "Tom", "Barfrau"

2, "Tim", "Bersarker"

3, "Norbert", "Barmann"


PEFORMANCE: STUDY OF JCSCR

Independant stdy

Tested several RDBMS on identical ardware:

Intel Xeon E5649, 6x2 Cores 2.53GHz, 32GB RAM

MS Windows Server 2008, 64-bit.

Simulates ERP ( 1 Mio. records per table)

10 SQL (SELECT, Joins, UPDATE, DELETE)



PEFORMANCE: STUDY OF JCSCR

Runtime of 10 SQL-statements of different complexity:


0

5

10

15

20

25

Oracle DB2

0

20

40

60

80

100

120

140

Oracle DB2

0

20

40

60

80

100

120

140

Oracle DB2

0

100

200

300

400

500

Oracle DB2

0

200

400

600

800

1000

Oracle DB2

0

500

1000

1500

2000

2500

3000

Oracle DB2

0

100

200

300

400

500

600

700

Oracle DB2

0

2000

4000

6000

8000

10000

Oracle DB2

0

20

40

60

80

100

120

Oracle DB2

0

50

100

150

200

Oracle DB2


PERFORMANCE: CONCLUSION

According to this study:

For long running queries DB2 is faster

For short running queries Oracle is faster


0

500

1000

1500

2000

2500

3000

Oracle DB2

0

20

40

60

80

100

120

Oracle DB2

Worst case for Oracle Best case for Oracle

Smaller is better


SUPPORTED OS

DB2

DB2 LUW

Linux

Unix (HP/UX Itanium, AIX)

Windows

DB2 for z/OS

DB2 for i

Version 7 Release 1 (aka DB2/400)

DB2 Server for VSE & VM

Version 7.4

(Different code base)

Oracle

Windows

Linux

HP/UX Itanium

AIX

Solaris



LICENSE MODELS

DB2

Processor Value Unit (PVU)

Authorized User Single InstallLicense (AUSI or AU)

Terabyte Pricing (TB)

Pay per whole TB

Limited Use Socket (LUS)

Licensing by sockets

Fixed Term Licence (FTL)

License for one year

Oracle

Processor

Named User Plus (NUP)



EDITIONS

DB2

DB2 Express-C

DB2 Express Server Edition

DB2 Developer Edition

DB2 Workgroup Server Edition

DB2 Enterprise Server Edition

DB2 Advanced Workgroup Server Edition

DB2 Advanced Enterprise Server Edition

Oracle

Express (11g)

Personal Edition

Standard Edition (SE)

Standard Edition 2 (SE2)

Enterprise Edition (EE)



DB2: LIMITS & LICENSES


Express-C (Free)

Express Server

Workgroup Server

Enterprise Server

AdvancedWorkgroup

AdvancedEnterprise

Memory 16 GB 64 GB 128 GB Unlimited 128 GB Unlimited

CPU (Cores)

Throttledfor 2 cores

Throttledfor 8 cores

4 sockets, 16 cores

Unlimited 16 Cores Unlimited

Data 15 TB 15 TB 15 TB Unlimited 15 TB Unlimited

LicenseLimits

N/A Min. 5 AU200 PVUs

Min. 5 AU 25 AU per 100 PVU

25 AU per 100 PVU

None

LicenseOptions

FTL, LUV, PVU, AU

LUS, PVU, AU PVU, AU PVU, AU, TB PVU, AU, TB

„All in“ - - - - ● ●


DB2 „OPTIONS AND PACKS“

Titel des Foliensatzes

High Value Capability Express

Edition

Workgroup

Server

Edition

Enterprise

Server

Edition

Advanced

Workgroup

Edition

Advanced

Enterprise

Edition

Comments

Performance Management

OPM, WLM, OQWT,

Data Server Manager

Native Encryption

BLU Acceleration feature

DB2 pureScale feature

pureScale member

limitations in WSE

and ESE

Database Partitioning (MPP)

Table and Index Compression

Optim Tools,

Data Server Manager

Rest of Optim tools

Optim tools available

separately

Heterogeneous Data

Virtualization

Federation Server is

available separately

Advanced Recovery Feature

Optim Workload Replay

Included

Separate BVO


COMPARISON OF CONFIGURATIONS: SINGLE INSTANCE, SE2

DB2 Workgroup Edition

1 AU = 428,20 $

5 Users Minimum

1 CPU = 21.410 $

Max. 4 sockets /16 cores

128 GB RAM

50 Users ~ 1 CPU

2 CPU / 100 User

42.820 $

Oracle SE2

1 NUP = 350 $ + 77 $ = 427 $

10 Users Minimum

1 CPU = 21.350 $

Max. 2 sockets

50 Users ~ 1 CPU

2 CPU / 100 User

42.700 $


2 CPU / 100 User128 GB RAM


COMPARISON OF CONFIGURATIONS: 4-NODE CLUSTER (4*4 CPUS)

DB2 Enterprise Advanced

DB Enterprise Advanced

4*4*68.400$= 1.094.400$

PureScale

included 0$

Partitioning

included 0$

Adaptive Compression

included 0$

Total: 1.094.400 $

+ 2 CF Server

Oracle EE + Partitioning + AC

Enterprise Edition

4*4* 57.950$= 927.200$

Real Application Clusters

4*4* 5.060$= 80.960$

Partitioning

4*4* 14.030$= 224.480$

Advanced Compression

4*4* 14.030$= 224.480$

Total: 1.376.160 $


4 * 4 CPU / 256 GB RAM


ROUNDUP

Oracle No DB2 mode necessary

Complicated license model

Always consistent

No Lock escalation

DDL auto commit

No Strikes for Table DDL

Standby: Backup, Consistent Read

Column Compression bound toExadata-Storage

No Shared Nothing MPP solution

…

DB2 Oracle compatibility-mode

More flexible and morecomplicated license model

Supports dirty reads

Lock escalation possible

DDL Rollback

3 Strikes Table DDL

Standby: Dirty Reads only

More Advanced compression forTables and Indexes

Massively Parallel Processing (MPP)

…




Q & A

Documents

DOAG 2015 . DB2 SHOOTOUT · PDF filePL/SQL and ABAP/4 Know How ... Dilbert Barfriend Dilbert Barfriend Dil 3 friend Norbert 3 Nick King 22 2 Uncompressed 1 Robert Ba 2 Nick 3 Bert