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Oracle 8 Tips  

by Burleson Consulting

The Data Warehouse Development Life Cycle

Distributed Oracle Data Warehouses

REAL-WORLD TIPS AND TECHNIQUES FOR ORACLE SNAPSHOTS

Even with Oracle’s distributed features, it is still far faster to process a table on a local host than it is to process a remote table across SQL*Net’s distributed communication lines. As such, table replication is a very desirable technique for improving processing speeds.
Several factors influence the decision about replicating tables. The foremost considerations are the size of replicated tables and the volatility of the tables. Large, highly active tables with many updates, deletes, and inserts require a lot of system resources to replicate and keep the tables synchronized with the master table. Smaller, less active tables are ideal candidates for replication, because the creation and maintenance of the tables will not consume a high amount of system resources.

Oracle’s snapshot facility is relatively mature, and it generally works as noted in the Oracle documentation. However, the flexibility of the snapshot tool gives developers many choices in how snapshots can be created and refreshed. Developers can refresh a replicated table in full, re-create a snapshot at will, choose periodic refreshes of a snapshot, and use database triggers to propagate changes from a master table to a snapshot table. While the choice of techniques depends on individual applications, some general rules apply.

If a replicated table is small and relatively static, it is usually easier to drop and re-create a snapshot than to use Oracle’s REFRESH COMPLETE option. A crontab file can be set up to invoke a drop and re-create at a predetermined time each day, completely refreshing the entire table.

Another popular alternative to the snapshot is using Oracle’s distributed SQL to create a replicated table directly on the slave database. In the following example, the New York database creates a local table called EMP_NY, which contains New York employee information from the master employee table at corporate headquarters:


This is an excerpt from "High Performance Data Warehousing", copyright 1997. To learn more about Oracle, try "Oracle Tuning: The Definitive Reference", by Donald K. Burleson.  You can buy it direct from the publisher at 30% off here:
http://www.rampant-books.com/book_1002_oracle_tuning_definitive_reference_2nd_ed.htm

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