Seagate ST43401N/ND Informations techniques télécharger pdf (Page 47)

Migrating to Sybase Adaptive Server Enterprise 11.5 4-5

Adaptive Server Enterprise 11.5 Determine Migration Approach

Cutover Without Replication

The issues for the cutover without replication approach are:

Environment The environment used for SQL Server 11.5 needs to be more powerful to

handle the query and replication loads. See the Replication Server Conﬁguration

Guide.

Be sure to account for any increased release 11.5 memory requirements that

apply to your conﬁguration. For more information, see:

• The installation guide for your platform. It gives basic RAM requirements.

• Chapter 6, “Implement: Making Required Database Administration

Changes”.

• Details on conﬁguring memory and data caches in the System Administration

Guide

• Information on how to conﬁgure memory for performance in the Performance

and Tuning Guide.

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

Scheduling Developing and running the replication facility, validation and performance

suite, and fallback script requires signiﬁcant effort. If your environment

already uses replication, this effort will be notably easier.

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

development schedule for release 11.x issues.

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

Table 4-3: Cutover migration

Issue Recommendations and Tips

Method Upgrade all databases to release 11.5 at the same time. A cutover without

replication is common in small organizations for development or production

servers.

Table 4-2: Parallel migration (continued)

Issue Recommendations and Tips

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Seagate ST43401N/ND Informations techniques Page 47