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  Oracle Replication Tips by Burleson

Moving Large Oracle Data Sets

Replication propagates data one change at a time.  If you insert 300 rows into a replicated table, those 300 rows are propagated and applied one row at a time to insure data integrity. 

Oracle supports parallel propagation across the database links, but the rows must be inserted at each master site in order.  This is not a problem for even relatively high transaction rates on OLTP systems. However, if you load a million rows of data, it could take hours or days to propagate.  As if that were not bad enough, the table that you load the data into will be read-only until the propagation is completed. 

Another example is in the replication of the PUBS schema.  If that schema contained millions of rows of data, the replication creation could take days.  There must be a better way to load data into a replicated table.  There is, and it is called offline instantiation.


This is an excerpt from Oracle Replication By Rampant TechPress (only $19.95).  You can click here to order a copy and get instant access to the code depot:

http://www.rampant-books.com/book_2003_2_replication.htm


Get a Personal Oracle Replication Mentor

The author is now offering personal mentors for Oracle DBAs where you can have an Oracle expert right at your fingertips, anytime day or night. We work with hundreds of Oracle databases every year, so we know exactly how to quickly assist you with any Oracle replication question. 

You can get me personally, or any Oracle Certified replication DBA with more than 20 years of full-time IT experience. 

 

 

 
 
 

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