April 1999
Intermediate to advanced
552 pages
15h 39m
English
Content preview from Oracle Distributed Systems
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DBMS_OFFLINE_SNAPSHOT: Performing Offline Snapshot Instantiation
The DBMS_OFFLINE_SNAPSHOT package allows you to instantiate snapshots without having to run the CREATE SNAPSHOT command or the DBMS_REPEAT.SNAPSHOT_REPOBJECT procedure over the network. Doing offline instantiation in this way is particularly useful in cases in which you wish to instantiate a snapshot site with a large amount of data in an advanced replication environment. Offline instantiation refers to the population of snapshots with the import and export utilities, as opposed to using the DBMS_SNAPSHOT.REFRESH procedure. This technique is less time consuming and less taxing on your network, and it minimizes the time your environment must be quiesced.
How the Package Is Used
The following table summarizes the steps you follow when using DBMS_OFFLINE_SNAPSHOT:
Step | Where Performed | Activity |
|---|---|---|
1 | Master site | Create snapshot log on table(s) to be snapshotted (optional, but recommended). |
2 | Master site | Create a snapshot locally on the table(s) to be snapshotted. |
3 | Master site | Export SNAP$_table_name table(s) created in Step 2 as the schema owner. |
4 | New snapshot site | DBMS_REPCAT.CREATE_SNAPSHOT_REPGROUP. |
5 | New snapshot site | DBMS_OFFLINE_SNAPSHOT.BEGIN_LOAD. |
6 | New snapshot site | Import SNAP$_table_name tables from export file created in Step 3. |
7 | New snapshot site | DBMS_OFFLINE_SNAPSHOT.END_LOAD. |
8 | Master site | Drop snapshot(s) created in Step 2. |
Installation and Access
The DBMS_OFFLINE_SNAPSHOT package iscreated when the Oracle database is installed. The ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.