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1 22 nd November 2011 • 10:30 Platform: DB2 LUW Udo Brede Quest Software Session: Oracle RAC vs DB2 LUW pureScale
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22nd November 2011 • 10:30
Platform: DB2 LUW
Udo Brede
Quest Software
Session:
Oracle RAC vs DB2 LUW pureScale
2
Agenda
• Marketing Message
• Clustering/Scalability
• Technology Overview
• Basic Components
• Available
• Installation
• Administration and Monitoring
• Summary
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Marketing Messages pureScale RAC (Real Application Clusters)
• Unlimited Capacity • Buy only what you need, add
capacity as your needs grow
• Application Transparency • Avoid the risk and cost of
application changes
• Continuous Availability • Deliver uninterrupted access to
your data with consistent
performance
• 24/7 availability • Provide continuous uptime for database
applications
• On-demand scalability • Expand capacity by simply adding servers to
your cluster
• Lower computing costs • Use low-cost commodity hardware and
reduce cost of downtime
• World-record performance • Runs faster than the fastest mainframe
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Marketing Message RAC
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Marketing Message pureScale
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Clustering/Scalability: Oracle RAC
Application
server 1
Application
server 2
Application
server 3
Node 1
Instance 1
Node 1 Node 1
Instance 2 Instance 3
RAC
Database
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Clustering/Scalability: DB2 pureScale
GBP
Group Lock
Manager
Member 1
PRODDB1
Catalog DBCONFIG
Log
Catalog
Log
DBCONFIG PRODDB2
BPs
BPs
Member 2
PRODDB3
Catalog DBCONFIG
Log
Catalog
Log
DBCONFIG PRODDB4
BPs
BPs
DATA
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DB2B
BSDS
Log
Workfile
DB
DB2A
BSDS
Log
Workfile
DB
DB2
Catalog
DATA
Member 1 Member 2
Clustering/Scalability: DB2 z/OS
Data Sharing SYSPLEX
GBP
BP
SCA
Lock
Structure
BP
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Technology Overview - RAC
• Oracle„s High Availability Solution
• RAC is a “shared disk” clustered database • All instances share a common set of database files
• Many instances sharing a single physical database
• Many instances of Oracle running on many nodes
• Each instance in the cluster has it‟s own SGA and dedicated sessions • At any instant, a user session is connected to only one instance
• All instances having common data and control files
• Each instance has individual log files and undo segments
• All instances can simultaneously execute transactions against the single physical database
• The “global” cache is the combination of each local buffer cache; it
is maintained via a high-speed dedicated network called the cluster
interconnect
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Technology Overview - RAC
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Technology Overview - pureScale • Clients connect anywhere and see single database
• Clients connect into any member
• Automatic workload balancing and client reroute may change underlying physical member to which
client is connected
• DB2 engine runs on several host computers • Co-operate with each other to provide coherent access to the database from any member
• Integrated cluster services • Failure detection, recovery automation, cluster file system
• Tivoli SA MP, STG RSCT and GPFS
• Low latency, high speed interconnect • For example InfiniBand network
• PowerHA pureScale technology/Cluster caching facility (CF) • Efficient global locking and buffer management
• Synchronous duplexing to secondary ensures availability
• Data sharing architecture • Shared access to database
• Members write to their own logs on shared disk
• Logs accessible from another host (used during recovery)
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Technology Overview - pureScale
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Basic Components
RAC • Node
• Cache Fusion
• Global Cache
• LMON/Global Enqueue Service Monitor
• Fast Application Notification (FAN) and Transparent Application
Failover (TAF)
• Global Database
• Cluster Interconnect
• Grid Infrastructure
• Global Filesystem, Cluster File System, Automatic Storage
Management (ASM)
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Basic Components
pureScale • Member
• Coupling Facility
• Group Bufferpool (GBP)
• Global Lock Management (GLM)
• Shared Communication Area (SCA)
• PowerHA pureScale Server
• Cluster Interconnect
• DB2 Cluster Services
• General Parallel File System (GPFS), Automatic Storage
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Basic Components of DBMS
Oracle • Instance
• File
• Database
• Tablespace
• Schema
• Table
• Index
• View
• Trigger
• Rollback Segment
• Stored Procedures
• SQL Plus
• Packages
DB2 LUW • Instance
• Container
• Database
• Tablespace
• Schema
• Table
• Index
• View
• Trigger
• NA
• Stored Procedures
• DB2 CLP
• Modules
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Different Terms - Similar Meaning
Oracle
• Data Guard
• Package
• Data Block
• Dictionary
• Alert Log
• Redo Log
• Archive log
• Segments
• Statement Cache
• System Global Area (SGA)
DB2 LUW
• HADR
• Module (9.7)
• Data Page
• Catalog
• Diag log
• Log Files
• Archival Logging
• Space Consuming Objects
• Package Cache
• Instance shared memory / DB
shared memory
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Instance & Database
Oracle • Instance
• A collection of Processes
• One data dictionary
• one active database
• Init.ora parameter file
DB2
• Instance
• Logical database server
environment
• Also referred to as a Node
• 1 to many databases
• Database Manager
Configuration File
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Instance
DB2
D
B
M
C
O
N
F
I
G
D
B
M
C
O
N
F
I
G
Instance_1
PRODDB1
Catalog DBCONFIG
Log
Catalog
Log
DBCONFIG PRODDB2
BP’s
BP’s
Instance_2
TESTDB1
Catalog DBCONFIG
Log
Catalog
Log
DBCONFIG TESTDB2
BP’s
BP’s
SID Oracle Database
Control
files
Data
files
Redo
log
files
Data
Dictionary
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Product Options
• Express Edition • 1 CPU/1GB RAM
• 4 GB max DB size
• Windows/Linux only
• Standard Edition • 4 sockets
• Unlimited scalability
• RAC (but only with ASM)
• Enterprise Edition • Unlimited scalability
• Table Partitioning
• RAC
• Express-C • 2 CPU/2GB RAM
• Windows/Linux/Solaris/Mac
• Express Edition • 4 CPU/ 4GB RAM max
• Workgroup Edition • 4 CPUs/ 16 GB RAM
• Enterprise Server Edition • Unlimited scalability
• Data partitioning (DPF)
• pureScale
Oracle DB2
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Basic Components
pureScale • Shared Disk Architecture
RAC • Shared Everything Architecture
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Available
• Platform • Linux (also z/Linux!)
• Unix (Aix, HP UX, Solaris)
• Windows
• http://www.oracle.com/tech
network/database/clustering
/overview/index.html
• Please check: • Network
• Server
• Cluster
• Storage
• Platform • AIX
• Linux
• http://publib.boulder.ibm.com/inf
ocenter/db2luw/v9r8/index.jsp
• Please check: • Network
• Server
• Cluster
• Storage
Oracle RAC DB2 pureScale
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Overview of Install steps of RAC
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Install Steps of RAC
• Oracle Clusterware runinng by Cluster Ready Services (CRS)
• Oracle RAC installation
• Virtual Internet Protocol Configuration Assistant (VIPCA)
• Running the Oracle Net Configuration Assistant (netca)
• Database Configuration Assistant (DBCA)
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Overview of Install steps of pureScale
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Install Steps of pureScale • Installing DB2 ESE pureScale 9.8
• Setup Instance
• Set User Information (instance owner, fenced user)
• DB2 Cluster File System
• Host List
• Cluster Caching Facility
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Administration and Monitoring of RAC
• Command line
• Oracle Enterprise Manager Grid Control
• 3rd party vendors
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Administration and Monitoring of pureScale
• DB2 commands
• IBM Optim
• 3rd party vendors
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Summary
Oracle or DB2 LUW or both:
• DB2 Compatibility Vector enable Oracle
Compatibility Features (db2set
DB2_COMPATIBILITY_VECTOR=ORA)
• With DB2 9.7 most Oracle data types are available
• PL/SQL is available also for DB2 LUW since 9.7
• Oracle RAC and DB2 pureScale
• Migration tools and support are available (MEET
DB2, Data Movement Tool, …)
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Before you go for it: There are some Restrictions for pureScale
• InifiniBand network requirement
• Limited OS support (AIX, Linux)
• Only one database is allowed per instance
• No HADR support
• Several system table functions are not supported
• REORGCHK_TB_STATS
• REORGCHK_IX_STATS
• No support for data partitioned tables
