© 2004 IBM Corporation DB2 – Informix Terminology and Architecture Comparison By Pradeep Kutty Jan 30 th, 2004

© 2004 IBM Corporation

DB2 – Informix

Terminology and Architecture Comparison

ByPradeep Kutty

Jan 30th, 2004

© 2004 IBM Corporation KCIIUG - 2004

DB2 – Product Family

Personal Edition (PE)

Enterprise Edition (EE)

Everyplace

Enterprise Extended Edition (EEE)

Workgroup Edition (WE)

EnterpriseServer Edition (ESE)

Version 8


Products Positioning

Single Product line for all Applications

–Common code base for UNIX and NT

–Differentiation depending on target platform and licensing strategy

Additional applications built upon the database server

–Data warehouse

–OLAP

–Connectivity (DB2 Connect, Data Joiner)

–Web enablement (Web Sphere Application Server)


Informix – Product Family

SE /CISAM

Online 4.x

Online 5.x

Online 6.x

Online 7.x

XPS 8.x

9.x

8.1x8.2x

8.3x

8.4x

9.1x

9.2x9.3x

9.4x

7.1x

7.2x 8.5x

9.5x7.3x


Products Positioning

IDS (7.x and 9.x):

–OLTP

–Data blades and Extensibility

–Replication (HDR and ER)

–Max Connect

XPS (8.x) –

–Data Ware Housing

–Cluster support


Informix – Long Term

2003 2004 2005 2006

6.2 7.27.1Red Brick:BI Tool Integration,Performance

8.40 8.608.50XPS:BI Tool Integration,Ease-of-Use

9.40 9.609.50IDS:RAS, Ease-of-Use, Security

2002


Platforms Supported

DB2ƒ AIXƒ NUMA-Q PTXƒ Linuxƒ SUN Solarisƒ HP UXƒ Linux/390 (Not EEE)

ƒ AS/400ƒ OS/390ƒ Windowsƒ OS/2

XPSƒ AIXƒ NUMA-Q PTXƒ Linuxƒ SUN Solarisƒ HP UX

ƒ Compaq True Unixƒ Reliant Unix

IDSƒ AIX 32/64 Bitƒ NUMA-Q PTXƒ Linux Intel / Alphaƒ SUN Solaris Intel / Sparcƒ HP UX 32/64 Bit

ƒ Compaq True Unixƒ Reliant Unix 32/64 Bitƒ SCO Open Serverƒ SCO UNIXWARE 7ƒ Windows NT / 2000ƒ Tandem Nonstop UX C61ƒ DEC TRU64ƒ NCRƒ Fujitsu/Siemensƒ SGI 32/64 Bitƒ Data General DGUX


DB2 Architecture

TCP/IP or SHM and Semaphores or any Network Protocol

Client

Server

Applications

Coordinator agent EDU

Subagents EDU

Prefetchers

Page Cleaners

Containers

Logs

LoggerEDU

Log Buffer

Buffer Pool

DeadlockDetector

Log requests

Prefetch Requests Prefetch Manager

Read Req

Parallel Page writerequests


IDS/XPS Architecture

Other VPs: ADM, ADT, Java, etc.

Client

Resident

Virtual

Communication

NetVP

AIOVP

CPUVP

PIOVP

LIOVP

ShmVP

ExtVPLogs

Disks

IDS only


Process vs. Thread

“In Solaris, creating a process is about 30 times slower than creating a thread, synchronization variables are about 10 times slower, and context switching about 5 times slower.”

Thread PrimerPage 21


Terminology

DB2

–Instance

–Database

–Partition/Node

–Node group

–Table space

–Container

IDS/XPS

–Instance

–Database

–Co-server

–Co-group

–Dbslices, Dbspace

–Chunks


Configuration

DB2

–Instance Parameters controlled by DBM CFG

–Every database has its own database configuration

–Registry and Environment Variables

–SQL SET command

–Multi threaded only on NT

Informix

–Instance Parameters controlled by ONCONFIG

–Environment Variables

–SQL SET Command

–Multi threaded on UNIX and NT


Storage

DB2 (table spaces)

–System Managed Storage (SMS)

–Database Managed Storage (DMS)

• Files

• Devices

–Configurable page size: 4KB, 8KB, 16KB, 32KB

IDS/XPS (db spaces)

- Database ManagedStorage

• Cooked• Raw

–IDS pre-defined page size

–XPS configurable: 2KB, 4KB, 8KB


Extent Allocation

DB2

–Extent Size set at the table space level

–Allocated in a round robin fashion among containers

–Valid for all tables within the table space

Informix

–Extent size set at the table level

–Allocated in a serial manner


Tables

DB2

–One table per table space

–Partitioning in a EEE environment

–Two extents are allocated at table creation time

• Extent map• Data extent

Informix

–Can span multiple db spaces (fragmentation)

–First and next extent control extent sizing

–Doubling after every 16 extents


Table Types

DB2

–Not logged initially

–Global Temp Table

–Volatile Table

–Summary Tables

Informix

–TEMP

–Scratch (XPS)

–Raw (XPS)

–Static (XPS)

–Operational (XPS)

–Standard (XPS)


Row size

DB2

–Determined by the page size

–Out-of-row objects:

• BLOB, CLOB, DBCLOB, LONG VARCHAR, LONG VARGRAPHIC

IDS/XPS

–32KB (page linking)

–(IDS) Out-of-row objects:

• BLOB, BYTE, CLOB, TEXT


Object Names Sizes

Object DB2 XPS IDSDatabase name 8 18 128User name 8* 8 32Table name 128 18 128Column name 30 18 128Index name 18 18 128Procedure name 18 18 128


Memory Usage

IDS/XPS

–Instance memory shared by all databases(buffer pool, locks, heap, stack, sort, cache, etc)

DB2

–Instance shared memory

–Database shared memory(buffer pool, lock list, sort, heap, etc.)

–Application shared memory

–Agent private memory


Indexes

DB2

–Separate Table space than table (DMS)

–Forward and Reverse Scans

–B-Tree

–MDC Index

–Db2advis [Advisor]

Informix

–Attached and Detached Indexes

–B-Tree

–R-Tree (IDS Only)

–Functional (IDS Only)

–Bitmap (XPS Only)

–GK (XPS Only)


Locking

DB2

–Row level is the default

–LOCK parameters include: LOCKLIST and MAXLOCKS

–LOCK escalation can occur based on parameter settings

Informix

–Specified at table creation

–Default is page

–ONCONFIG Parameter: LOCKS

–No Lock escalations


Logical Logs

DB2

–Logs allocated at Database level

–Primary and secondary logs

–Circular logging

–Archival Logging

–Backed up using USEREXIT

–Dual logging

–Infinite log space

Informix

–Logs allocated at Instance level

–Default is No logging

–Backed up using• ontape• onbar


Management [Analysis] Tools

DB2

–Control Center (backup, index, configuration wizards)

–Alert center

–Performance monitor

–Snapshot Monitoring• Locks• BufferPools• SQL• Sort Operations

–Event Monitors

–Explain [dynexplain/db2exfmt]

Informix

–onstat

–onparams

–onspaces, etc.

–ISA

–I-SPY

–Explain


Utilities

DB2

–Import / Export

–REORGCHK

–REORG

–RUNSTATS

–db2look

–Db2batch

–Load

–db2move

Informix

–dbexport

–HPL

–Unload

–Load

–Update statistics

–dbschema

–External Table (XPS)


Backup / Restore

DB2

–Online

–Offline

–Incremental

–Delta

–Split Mirror

–Redirected Restore

Informix

–Level 0

–Level 1

–Level 2

–EBR

–Imported Restore


Extensibility

DB2 Types:

–Distinct

–Structured

DB2 Functions

–Scalar

–Table

IDS Types:

–Distinct

–Row

–Opaque

–Collection (set, list, …)

IDS Functions:

–Scalar

–Iterator

–Aggregate


Data Blades and Extenders

DB2 Extenders

–Spatial

–XML

–Text

–Audio

–Video

–Image

IDS Data Blades

–Spatial/geodetic

–Time Series, NAG

–Text, image, video

–Third parties

IDS Bundles

–Financial Foundation

–Law Enforcement Foundation

–Other to come


DB2 Future features

Autonomic Computing

4GL and ESQL/C (SQLI) support

IDS date types and functions

IDS replication

–HDR in V8.2

IDS fragmentation

R-Tree Indexes

Time Series Data blade


IDS – The Future

In Planning:

Backup & Restore enhancementsHigh Availability Data Replication

working with ERRemove Capacity Limitations

>2gig chunk sizeSecurity EnhancementsSystem Monitoring Enhancements

track causes of deadlocksUtility Enhancements

> 2gig file support

2003

Safety – High Availability

XML Standards Compliance

On-Line ReorgSafety – High AvailabilityApplication Dev / XML / Stds. Compliance

4GL with WebSphere / IDSAutonomic / Ease of AdministrationSoftware Group IntegrationSecurity EnhancementsPartner EnhancementsInfrastructure Improvements

Performance, Install, I-Star for Built-in UDTs

2004

Driven by Customer & Partner Requests2005

2006Announced GA March 28th IDS

9.60

IDS9.40

IDS9.50


Conclusion

DB2 and IDS complement each other

The synergy between development groups will accelerate technology migration both ways

The IBM portfolio strengthens the Informix position

The DB2 federated approach helps support dual environments


For Additional Information

Web sites:

–http://www.ibm.com/software/data/db2

–http://www.ibm.com/software/data/informix


Questions?

Documents

© 2004 IBM Corporation DB2 – Informix Terminology and Architecture Comparison By Pradeep Kutty Jan 30 th, 2004