Maximizing Performance and Scalability with IBM WebSphere

O

object request broker (ORB)

as component of a WebSphere queue, 280

as key part of EJB container's overall performance, 377

Object Request Broker (ORB)

utilized by RMI/RMI-IIOP, 457 “460

ODBC database interface

provided by WebSphere, 215

ODBC-based drivers

function of, 426 “427

Oetiker, Tobias

MRTG and RRDtool created by, 247

OLAP workload. See Online Analytical Processing (OLAP) workload

Old Heap

managing in Sun HotSpot JVM, 288

Online Analytical Processing (OLAP) workload

workload summary matrix for, 434

Online Transaction Processing (OLTP) workload

CPU availability needed for, 433

open files

increasing the amount of, 258 “259

increasing the amount of in Linux 2.2+, 259

increasing the amount of pre-Linux 2.2, 258 “259

open queuing model

function of, 279

Open Shortest Path First (OSPF)

routing mechanism, 354 “355

smart routing protocol, 277

using to distribute traffic to multiple locations, 309

operating systems

performance tuning checklists for, 252

operating system thread

to JVM thread ratio, 93

operating system tools

custom-built profiling packages, 244

operational alarms

monitors and probes associated with, 244 “245

operational availability vs. service availability, 292 “293

operations methodology

performance methodology intersection with, 2 “3

Opteron. See AMD Opteron

models available, 90

Opteron (x86 “64)

defined, 83

optical fiber cable

use of for high-speed FCAL implementations , 126

optimization

the methodology of in WebSphere environments, 232

optimization and tuning

checklist for, 251 “287

costs associated with for the pilot application, 16 “17

importance of trend analysis strategy in, 249

planning after analysis and review, 18 “19

optimization and tuning checklist

for WebSphere environment running under Linux, 255 “260

for Windows NT, 2000, XP, and 2003, 252 “255

optimized system

definition of, 1 “5

example of pre- and post-upgrade support costs for, 10 “11

Option A caching

function of in EJB environments, 416 “418

Option B caching

function of in EJB environments, 416 “418

Option C caching

function of in EJB environments, 416 “418

Oracle 8 i and 9 i

configuration and tuning parameters, 437 “438

example showing high-level architecture, 436

Oracle 8 i and 9 i databases

function of, 435 “438

Oracle Connection Time Failover (CTF)

function of, 365

Oracle Connect Time Failover (CTF)

function of, 366 “367

vs. Oracle Transparent Application Failover (TAF), 367

Oracle Parallel Server (OPS)

availability of, 222

Oracle TNS names configuration file for Transparent Application Failover

code example, 368

Oracle Transparent Application Failover (TAF)

function of, 367 “369

Oracle Transparent Application Failover(TAF) vs. Oracle Connect Time Failover (CTF), 367

Oracle Transparent Application Failover

settings for method directive in, 369

Oracle Transparent Network Substrate (TNS) names configuration file for server failover

code example of, 366

Oracle9 i Real Application Clusters (RAC) system vs. hot-standby and active-standby configurations, 222

Oracle-timed collection statistics

commands for turning on and off, 438

ORB (Object Request Broker)

as component of a WebSphere queue, 280

ORB plug-in

use of for WLM of non-Web-based topology, 202

organization redundancy

understanding, 38

Orphan Timeout

setting in WebSphere 4, 447 “448

Orphan Timeout setting

in JDBC connection pool manager, 444