April 1999
Intermediate to advanced
552 pages
15h 39m
English
Content preview from Oracle Distributed Systems
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DBMS_OFFLINE_OG: Performing Site Instantiation
When you add a new site to your replicated environment, you must not only create the replicated objects but also populate snapshots and replicated tables with a copy of the current data. Although you can set the copy_rows parameter to TRUE in your call to the DBMS_REPCAT package’s CREATE_MASTER_REPOBJECT or ADD_MASTER_DATABASE procedure, this option is not practical for schemas that are large or complex.
The DBMS_OFFLINE_OG package provides a more feasible method of site instantiation. The general idea is that you export data from an existing master site and import it into the new master site. While the import is taking place, the existing master site’s queue data updates to the new site, but the updates are not actually sent until the load is complete. This package lets you perform much of the instantiation without quiescing the entire replication group.
How the Package Is Used
The following table summarizes the steps you follow when using DBMS_OFFLINE_OG.
Step | Where Performed | Activity |
|---|---|---|
1 | Master definition site | DBMS_REPCAT.ADD_MASTER_DATABASE |
2 | Master definition site | DBMS_REPCAT.SUSPEND_MASTER_ACTIVITY |
3 | Master definition site | DBMS_OFFLINE_OG.BEGIN_INSTANTIATION |
4 | Any master site | Export replicated schema |
5 | Master definition site | DBMS_OFFLINE_OG.RESUME_SUBSET_OF_MASTERS |
6 | New site | DBMS_OFFLINE_OG.BEGIN_LOAD |
7 | New site | Import data from Step 4 |
8 | New site | DBMS_OFFLINE_OG.END_LOAD |
9 | Master definition site | DBMS_OFFLINE_OG.END_INSTANTIATION |
Installation and Access
The DBMS_OFFLINE_OG ...
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