April 1999
Intermediate to advanced
552 pages
15h 39m
English
Content preview from Oracle Distributed Systems
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The Replication Catalog
The replication catalog is the subset of the data dictionary that contains information about replicated objects at all master sites and, to a certain extent, snapshot sites. Operations that modify the data in the replication catalog, such as adding or removing master objects, must be propagated from the master definition site to other master sites. In general, changes to the replication catalog require that the affected replication group be quiesced. Just as Oracle maintains a deferred transaction queue (deftran) for queued transactions, it also maintains a queue for replication catalog changes, known as the repcatlog.
The 10 DBMS_REPCAT calls which create entries in the repcatlog queue are:
| DBMS_REPCAT.ADD_MASTER_DATABASE |
| DBMS_REPCAT.ALTER_MASTER_PROPAGATION |
| DBMS_REPCAT.ALTER_MASTER_REPOBJECT |
| DBMS_REPCAT.CREATE_MASTER_REPOBJECT |
| DBMS_REPCAT.DROP_MASTER_REPGROUP |
| DBMS_REPCAT.DROP_MASTER_REPOBJECT |
| DBMS_REPCAT.EXECUTE_DDL |
| DBMS_REPCAT.GENERATE_REPLICATION_SUPPORT |
| DBMS_REPCAT.RESUME_MASTER_ACTIVITY |
| DBMS_REPCAT.SUSPEND_MASTER_ACTIVITY |
Replication Catalog Data Dictionary Views
The data dictionary views that make up the replication catalog are the following:
- DBA_REPCAT
Name, status, and comment for every replication group. (Same as DBA_REPGROUP.)
- DBA_REPCATLOG
Lists all items in the repcatlog queue.
- DBA_REPDDL
Lists all DDL calls in the repcatlog queue.
- DBA_REPGENERATED
Lists all replication support objects.
- DBA_REPGROUP
Name, status, and comment for every replication group. (Same ...
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