By Ben Prusinski
Professional Oracle GoldenGate is a hands-on consultant to making and handling complicated info replication environments utilizing the most recent in database replication know-how from Oracle. GoldenGate is the long run in replication expertise from Oracle, and goals to be best-of-breed. GoldenGate helps homogeneous replication among Oracle databases. It helps heterogeneous replication concerning different manufacturers reminiscent of Microsoft SQL Server and IBM DB2 common Server. GoldenGate is high-speed, bidirectional, highly-parallelized, and makes just a gentle influence at the functionality of databases all for replication.
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Extra info for Expert Oracle GoldenGate
It discusses adding the local Extract, data-pump Extract, and Replicat for ongoing change synchronization. You also review initial data-loading methods, including using GoldenGate and native DBMS utilities. More advanced configurations are covered in later chapters, such as bidirectional replication in Chapter 5, heterogeneous replication in Chapter 6, and zero-downtime migrations in Chapter 13. Keep in mind that the same concepts covered in this chapter are a foundation to build on for those more advanced configurations.
Data is replicated from a single source to a single target in only one direction. Changes to database data are only made at the source database. The target database is read-only. info CHAPTER 3 ■ ARCHITECTURE Figure 3-4. One-way replication A one-way configuration is useful for offloading intensive queries and reports from the source database. It can also be used for maintaining a hot-standby database for failover purposes. Another concept you should keep in mind is that the source and target databases can be different database technologies.
Online DML changes will be occurring in the source database while the initial-load process is running. This is the most likely scenario in today’s environments, where downtime usually needs to be avoided. If you can quiesce or stop DML activity against the source database while the initial load is occurring, it is not necessary to start the Extract before the initial load. Let’s look at each of the basic replication steps in detail, beginning with setting up and starting the Extract. Starting the Extract When you’ve verified that the prerequisites are complete, the first step you need to complete in setting up replication is to start the Extract.