Seagate ST43401N/ND Guida di Installazione Scaricare il pdf (Pagina 41)

CHAPTER 4 Plan: Writing a Plan and Getting Ready to Migrate

• Information on how to configure memory for performance in the

Performance and Tuning Guide at

http://manuals.sybase.com:80/onlinebooks/group-

as/asg1250e/perf/@Generic__BookView

Note For a production system, execute the performance suite during off hours.

Scheduling

For a development system, you may want to add a short period to the

development schedule for release 12.5 issues.

For a production system, be prepared to postpone or back off if needed.

Phased Cutover

The issues for a phased cutover are described in the following sections:

Method

Change only one application and database to release 12.5 at a time.

Fallback

Consider making daily bcp dumps of the databases. To fall back, you can then

load the dumps into the earlier server. Keep in mind:

• You may need to modify the databases to support incremental bcp dumps.

• The earlier server cannot read release 12.5 backup files. You need to create

bcp or other scripts to move tables back to the earlier server.

• Do not use release 12.5 schema enhancements until the conversion

succeeds.

For information about scheduling backups of user databases, see the

System Administration Guide at

http://manuals.sybase.com:80/onlinebooks/group-

as/asg1250e/sag/@Generic__BookView

Application test suite

Ensure that the application test suite addresses both update correctness and

performance acceptability. Also ensure that you do the following:

• Maintain the directories/libraries for both releases.

• Make sure the applications are using the correct server.

• After successful validation, consider having users enter production queries

with the production toolset. A good time to do so is after hours or during

production lulls.

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Seagate ST43401N/ND Guida di Installazione Pagina 41