Seagate ST43401N/ND Installationsanleitung PDF herunterladen (Seite 40)

Determine Migration Approach

You can use dump database or bcp out before an upgrade to prepare for

fallback.

Plan a way to capture transactions after cutover to be used in case of fallback.

If you go into production and then need to back off, you will have to restore all

the transactions that occurred after the last dump/load.

Application test suite

For a development system, simple validation may be adequate. However, for a

production system, the test suite must address both update correctness and

performance acceptability.

See Chapter 7, “Test: Ensuring Stability and Performance” for more

information on testing.

Note You might want to validate over a 3-day weekend if possible.

Fallback after cutover

Consider making daily bcp dumps of the databases. You can then load the

dumps into the earlier server to fall back. Keep in mind:

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

• Earlier servers cannot read release 12.5 backup files. You need to create

bcp or other scripts to move tables back to pre-release 12.5.

• Do not apply 12.5 schema enhancements.

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

Bridging

There should not be any user impact during migration. The more stringent the

validation test is, the less likely you will have bridging issues.

Environment

Be sure to account for any increased release 12.5 memory requirements that

apply to your configuration. For more information, see:

•The installation guide at http://manuals.sybase.com:80/onlinebooks/group-

as/asp1250e/@Generic__CollectionView;pt=asp1250e

for your platform. It

gives basic RAM requirements.

• Chapter 6, “Implement: Making Database Administration Changes”.

• Details on configuring memory and data caches in the

System

Administration Guide at http://manuals.sybase.com:80/onlinebooks/group-

as/asg1250e/sag/@Generic__BookView

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Seagate ST43401N/ND Installationsanleitung Seite 40