1，理解基本概念
2，学习ORACLE的联机文档
Apply Services:
SQL Apply
REDO Apply
Switchover : no data loss
Failover :
maximum availibility
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maximum performance (default)
asynchronously
maximum protection
Disaster Recovery
data protection
HA
Complete data protection
Efficient use of system resources(on standby database:backup,query,reporting)
Flexibility in data protection to balance availability against performance
requirements
Automatic gap detection and resolution :RTS(redo transmit services)
Centralized and simple management(SQL*PLUS,DGMGRL,OEM)
Integration with Oracle Database
Automatic role transitions
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