Seagate ST43401N/ND Informazioni Techniche Scaricare il pdf (Pagina 104)

7-4 Test: Ensuring Stability and Performance

Developing Fallback Procedures Adaptive Server Enterprise 11.5

- For an around-the-clock operation, you may decide that an

initial goal of breaking even is reasonable.

• For cutover without replication, gear the migration for

equivalent performance between the old and new systems. A

goal of breaking even the ﬁrst week is reasonable.

•Aphased cutover is subject to the highest performance

expectations. Some performance tuning of the production

workload after cutover of the production server may be best. You

can time the production server cutover to occur as soon as

performance gains are acceptable and testing is successful.

See Chapter 4, “Prepare: Writing a Plan and Getting Ready to

Migrate” for information on migration methods.

Developing Fallback Procedures

Before you begin testing, be sure that you know how you will return

the test system to a known state when you have a problem. You will

use the same fallback plan when you migrate the production system.

During simple testing cycles, it’s sometimes faster to back out

unwanted changes. However, this is not recommended for timed

runs during benchmarking. You have to restore from backup after

each timed run to return the system to a known state.

Back up all databases before and after the test system upgrade, as

you would for a “real” upgrade. The backups preserve the layout of

data on disk and help you avoid confusion due to fragmentation and

page splits.

To ensure source code control, use scripts for all changes to objects.

This makes it much easier to recreate your environment if necessary.

Summary of Testing Techniques

You can use a variety of testing techniques in your test plan. The

following table describes the advantages and disadvantages of

various testing techniques and tools, including:

• Ad-hoc testing

• Manual test scripts and cases

• Keystroke capture tools

• Transaction generators

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Seagate ST43401N/ND Informazioni Techniche Pagina 104