Maximizing Performance and Scalability with IBM WebSphere

T

TCI. See Total Cost of Investment (TCI)

TCO. See Total Cost of Ownership (TCO)

TCP connection hash table

setting size of in Sun Solaris WebSphere-based applications, 265

TCP connection time-out

problems associated with changing settings, 330 “331

TCP hash table size settings

in IBM AIX, 271

TCP keepalive feature

deactivating on your Linux-based WebSphere application server, 256 “257

TCP keepalive settings

command for checking current, 261

for the Sun Solaris WebSphere-based applications, 261 “262

TCP maximum listen backlog setting

function of in IBM AIX, 270 “271

TCP port number assignment

changing maximum with the Registry Editor tool, 253

TCP Selective Acknowledgment

disabling in Linux, 256

TCP send and receive buffer attributes

setting in IBM AIX, 269 “270

TCP TIME_WAIT interval

setting for Sun Solaris WebSphere-based applications, 262

setting in IBM AIX, 267

TCP time stamp

enabling or disabling for Solaris WebSphere applications, 264

TCP time stamping feature

disabling on your Linux-based WebSphere application server, 256

TCPTimedWaitDelay value

changing with the Registry Editor tool, 254 “255

technical tests

warning about running behind the scenes, 242

testing

performance management, 26

testing tools

monitors and probes, 244 “245

recommended for WebSphere environments, 243 “244

for your WebSphere environment, 243 “246

thick Web server WebSphere topology

example of, 191

example of component mapping for, 192

overview of example components , 193

thin Web server WebSphere topology

example of, 190

thread size value

setting, 387 “389

steps for setting in WebSphere 4, 388

steps for setting in WebSphere 5, 388

threading characteristics

of JVMs, 161 “162

threads

effect on performance, 8

time stamps

placing in logging entries within your database, 241

TIME_WAIT state

settings between Web tier and application server, 389 “390

steps for setting in WebSphere 4, 390

steps for setting in WebSphere 5, 390

timing markers

warning about writing them into your code, 240 “241

Tivoli Performance tool

checking for I/O time-outs with, 392 “393

features from a profiling perspective, 515

function of, 513 “515

vs. HPjmeter and JProbe tools, 515

for monitoring and testing TIME_WAIT state, 390

for monitoring thread values in WebSphere 5, 387 “389

Performance Viewer screen, 514

using to monitor and test queues, 283 “284

tnsnames.ora file

example that has the CTF extensions in it, 366

tools

for testing your WebSphere environment, 243 “246

top command

for determining memory usage on Unix servers, 478 “480

getting your memory and swap space usage with, 480 “481

using Grep with, 479

topological architecture, 154 “164

blueprints, 165 “229

common elements to consider in, 165 “173

considerations for scalability and performance, 157 “164

and example of a building block for, 156 “157

Total Cost of Investment (TCI), 19 “24

Total Cost of Ownership (TCO)

cost comparisons for different implementations , 21 “23

inception of, 20

vs. Net Present Value (NPV), 23

an overview, 19 “23

vs. Return on Investment (ROI), 23

a two year comparison, 22 “23

tracing services

requests serviced by the application server, 59

transaction affinity

for EJB containers, 305

transaction characteristics

effect of on response times, 236 “238

graph comparing lightweight vs. heavyweight, 237

transaction management

effect on performance, 8

in multiple JVM environments, 185

transaction rate

considerations when implementing databases, 429 “430

effect on WebSphere environment, 238 “239

example of, 239

transactional affinity

for following container transactions, 336

Transparent Application Failover (TAF)

function of, 365

trend analysis

importance of for WebSphere application environments, 249

tuning

measuring the effects of, 246 “251

tuning and optimization

of EJB container, 377 “384