Index_T

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T

Tape storage devices, 51-52

defined, 51

performance, 52

schematic diagram, 51

See also Secondary storage

Testbeds, 29, 33-34

components, 34

database performance analysis testing, 431-36

defined, 33

flexibility and, 333

general configuration, 308

ISO correspondence, 310

LANs and, 34

network models, 307

node architecture, 309

prototype, 305, 306

sequence of messages and, 311

special-purpose, 306

use decision, 34

workloads, 322-26

See also Modeling tools

Throughput

curves, 340

defined, 136, 339

degraded, under system load, 318

device, 239

input, 247

Little's result with, 222

network, 314, 318

as performance metric, 339-40

relative, 223

server, 247

system, maximum, 249

Time, 109-10

as quantity, 109

in real-world system, 109

See also Performance measures

Timed Petri nets, 294-98

with conflict, 296

defined, 295

illustrated, 295

with immediate transitions, 297

priority and, 299

state transition timing graph, 296

transitions, 295

See also Petri nets

Token bus distribution system, 455-63

analytical modeling of bus, 456-63

average scan time, 459, 462, 463

case I, 457-60

case II, 460-61

case III, 461-63

defined, 455

introduction, 455

logical sequence numbering, 461

mapping logical to physical locations, 462

message service time, 458

physical/logical numbering, 458

preliminary formulations, 455-56

symbols/definitions, 457

with three interface units, 459

time delay, 458

total scan time, 462

See also Analytical modeling

Total probability theorem, 148

TPC-H benchmark, 433-34

Tradeoff analysis, 202, 332

Transaction manager, 94, 97-98

Transaction processing, response partitioning, 339

Transaction Processing Consortium (TPC), 323

benchmarks, 323, 326

workloads, 323

Transactions, 97-103

ACID, 98-100

basics, 100-102

defined, 100

elements, 137-38

execution of, 98

formalizing, 102-3

generating, 101

modeled, 102

processing, 103

Transition probabilities, 195-96

for communications system, 196

matrix, 194, 197

stationary, 195

Transition rate diagram, 191

Transitions, 282

defined, 280

enabled, 301

firing of, 301

immediate, 297

timed Petri net, 295

See also Petri nets (PNs)

Transmission error detection, 474-75

Triggers, 257

comparative, 259

self, 259

Two-operand addressing, 48

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