DB2 – Informix
Terminology and Architecture Comparison
By
Pradeep Kutty
Jan 30th, 2004
© 2004 IBM Corporation
DB2 – Product Family
Enterprise
Server
Edition (ESE)
 Enterprise
Extended Edition
(EEE)
Version 8
 Enterprise
 Workgroup
 Personal
Edition (EE)
Edition (WE)
Edition (PE)
 Everyplace
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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)
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Informix – Product Family
7.3x
9.5x
9.4x
9.3x
9.2x
7.2x
8.5x
9.1x
9.x
8.4x
7.1x
8.3x
Online 7.x
8.2x
Online 6.x
Online 5.x
XPS 8.x
8.1x
Online 4.x
SE /
CISAM
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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
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Informix – Long Term
2002
2003
IDS:
RAS, Ease-of-Use,
Security
9.40
XPS:
BI Tool Integration,
Ease-of-Use
8.40
Red Brick:
BI Tool Integration,
Performance
6.2
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2004
2005
2006
9.50
8.50
7.1
9.60
8.60
7.2
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Platforms Supported
DB2
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
XPS
AIX
NUMA-Q PTX
Linux
SUN Solaris
HP UX
Linux/390 (Not EEE)
AS/400
OS/390
Windows
OS/2
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ƒ
ƒ
ƒ
ƒ
ƒ
IDS
AIX
NUMA-Q PTX
Linux
SUN Solaris
HP UX
ƒ AIX 32/64 Bit
ƒ NUMA-Q PTX
ƒ Linux Intel / Alpha
ƒ SUN Solaris Intel / Sparc
ƒ HP UX 32/64 Bit
ƒ Compaq True Unix
ƒ Reliant Unix
ƒ Compaq True Unix
ƒ Reliant Unix 32/64 Bit
ƒ SCO Open Server
ƒ SCO UNIXWARE 7
ƒ Windows NT / 2000
ƒ Tandem Nonstop UX C61
ƒ DEC TRU64
ƒ NCR
ƒ Fujitsu/Siemens
ƒ SGI 32/64 Bit
ƒ Data General DGUX
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DB2 Architecture
Applications
Client
TCP/IP or SHM and Semaphores or any Network Protocol
Log Buffer
Coordinator agent
EDU
Subagents
EDU
Log requests
Server
Prefetch Requests Prefetch Manager
Prefetchers
Buffer Pool
Logger
EDU
Logs
Deadlock
Detector
Read Req
Page Cleaners
Parallel Page write
requests
Containers
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IDS/XPS Architecture
Client
Net
VP
LIO
VP
Shm
VP
CPU
VP
Resident
PIO
VP
Virtual
Communication
AIO
VP
Disks
Logs
IDS only
Ext
VP
Other VPs: ADM, ADT, Java, etc.
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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 Primer
Page 21
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Terminology
 DB2
 IDS/XPS
–Instance
–Instance
–Database
–Database
–Partition/Node
–Co-server
–Node group
–Co-group
–Table space
–Dbslices, Dbspace
–Container
–Chunks
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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
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Storage
 DB2 (table spaces)
–System Managed Storage
(SMS)
–Database Managed Storage
(DMS)
•
•
- Database Managed
Storage
•
•
Cooked
Raw
Files
Devices
–Configurable page size: 4KB,
8KB, 16KB, 32KB
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 IDS/XPS (db spaces)
–IDS pre-defined page size
–XPS configurable: 2KB, 4KB,
8KB
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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
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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
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Table Types
 DB2
 Informix
–Not logged initially
–TEMP
–Global Temp Table
–Scratch (XPS)
–Volatile Table
–Raw (XPS)
–Summary Tables
–Static (XPS)
–Operational (XPS)
–Standard (XPS)
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Row size
 DB2
 IDS/XPS
–Determined by the page size
–32KB (page linking)
–Out-of-row objects:
•
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BLOB, CLOB, DBCLOB,
LONG VARCHAR,
LONG VARGRAPHIC
–(IDS) Out-of-row objects:
•
BLOB, BYTE, CLOB,
TEXT
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Object Names Sizes
Object
Database name
User name
Table name
Column name
Index name
Procedure name
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DB2
8
8*
128
30
18
18
XPS
18
8
18
18
18
18
IDS
128
32
128
128
128
128
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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
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Indexes
 DB2
 Informix
–Separate Table space than
table (DMS)
–Attached and Detached
Indexes
–Forward and Reverse Scans
–B-Tree
–B-Tree
–R-Tree (IDS Only)
–MDC Index
–Functional (IDS Only)
–Db2advis [Advisor]
–Bitmap (XPS Only)
–GK (XPS Only)
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Locking
 DB2
 Informix
–Row level is the default
–Specified at table creation
–LOCK parameters include:
LOCKLIST and MAXLOCKS
–Default is page
–LOCK escalation can occur
based on parameter settings
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–ONCONFIG Parameter:
LOCKS
–No Lock escalations
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Logical Logs
 DB2
 Informix
–Logs allocated at Database
level
–Logs allocated at Instance
level
–Primary and secondary logs
–Default is No logging
–Circular logging
–Backed up using
–Archival Logging
–Backed up using USEREXIT
•
•
ontape
onbar
–Dual logging
–Infinite log space
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Management [Analysis] Tools
 DB2
 Informix
–Control Center (backup, index,
configuration wizards)
–Alert center
–Performance monitor
–Snapshot Monitoring
•
•
•
•
Locks
BufferPools
SQL
Sort Operations
–onstat
–onparams
–onspaces, etc.
–ISA
–I-SPY
–Explain
–Event Monitors
–Explain [dynexplain/db2exfmt]
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Utilities
 DB2
 Informix
–Import / Export
–dbexport
–REORGCHK
–HPL
–REORG
–Unload
–RUNSTATS
–Load
–db2look
–Update statistics
–Db2batch
–dbschema
–Load
–External Table (XPS)
–db2move
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Backup / Restore
 DB2
 Informix
–Online
–Level 0
–Offline
–Level 1
–Incremental
–Level 2
–Delta
–EBR
–Split Mirror
–Imported Restore
–Redirected Restore
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Extensibility
 DB2 Types:
 IDS Types:
–Distinct
–Distinct
–Structured
–Row
–Opaque
 DB2 Functions
–Scalar
–Table
–Collection (set, list, …)
 IDS Functions:
–Scalar
–Iterator
–Aggregate
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Data Blades and Extenders
 DB2 Extenders
 IDS Data Blades
–Spatial
–Spatial/geodetic
–XML
–Time Series, NAG
–Text
–Text, image, video
–Audio
–Video
–Image
–Third parties
 IDS Bundles
–Financial Foundation
–Law Enforcement
Foundation
–Other to come
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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
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IDS – The Future
2006
Announced GA March 28th
IDS
9.60
Backup
2005
2004
& Restore enhancements
Driven by Customer
High Availability Data Replication
& Partner Requests
working with ER
Safety – High
Remove Capacity Limitations
Availability
IDS
>2gig chunk size
XML Standards
9.50
Security Enhancements
Compliance
System Monitoring Enhancements In Planning:
On-Line Reorg
track causes of deadlocks
Safety – High Availability
Utility Enhancements
Application Dev / XML / Stds. Compliance
> 2gig file support
4GL with WebSphere
2003
IDS
9.40
Autonomic
/ Ease of Administration
Software Group Integration
Security Enhancements
Partner Enhancements
Infrastructure Improvements
Performance,
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/ IDS
Install, I-Star for Built-in UDTs
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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
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For Additional Information
 Web sites:
–http://www.ibm.com/software/data/db2
–http://www.ibm.com/software/data/informix
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Questions?
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