Seagate ST43401N/ND Guía de instalación descargar pdf (Pagina 38)

Determine Migration Approach

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

bcp or other scripts to move tables back to pre-release 12.x.

• Do not apply 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

Additional tips:

• Upgrade Replication Server first.

• Be sure the applications are using the correct server. For details on the

interfaces file and the $DSQUERY environment variable, see the

configuration guide for your platform.

• Remember to include client fallback time in the calculation.

• For 24x7 sites, load time delays can impact synchronization. Consider

replicating to ASE 12.5 and then switching servers.

Application test suite

Since the parallel with replication approach is best for high availability

applications, it is imperative that the test suite address both update correctness

and performance acceptability. Execute this suite before switching users to the

new system.

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

information on testing.

Note 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.

Bridging

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

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

To ensure correct updates and acceptable performance, test the replicated

environment.

See the

Replication Server product manuals at

http://www.sybase.com/detail_list/1,3691,2721,00.html

for more information.

Environment

The environment used for ASE 12.5 needs to be more powerful to handle the

query and replication loads. See the Replication Server configuration guide for

your platforms by going to the

Replication Server product manuals at

http://www.sybase.com/detail_list/1,3691,2721,00.html

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Seagate ST43401N/ND Guía de instalación Pagina 38