This period of time in order to provide customers with a complete disaster preparedness program, has been testing 9i data guard,
Testing the way of LOGICAL+LGWR, there are many strange mistakes, and then replaced by PHYSICAL+LGWR way, there are some unsatisfactory place, and then replaced by the most original Physical+arch way, This method itself Dataguard is not a problem, but in the primary library Alertlog in the checkpoint not complete waiting events, It can be seen that all the work is given to the arch process as a performance load for primary.
Fortunately, later resolved the problems in the PHYSICAL+LGWR, so the final decision to this way, is also a great deal of trouble, but this time let me for 9i data guard configuration and application is understood more thoroughly, is a good thing.
This period of time to test data guard problems and solutions have been basically written here, the work of their own is a memo is a summary of it.
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