最近在客户现场搭建一套容灾环境，发现遇到了BUG,在无法解决的情况下，放弃了broker，依旧可以实现ADG，Oracle无法实现双主，但是MySQL可以哈。官网说法记录一下。

OERR: ORA-16597 "Oracle Data Guard broker detects two or more primary databases" (varies by version) Reference Note (文档 ID 172973.1)
PURPOSE

This is a brief reference note to show the meaning of database error "ORA-16597". It includes the error text, "Cause" and "Action" from message files for each database version from 9.2 onwards, along with search links and details of any database bug issues related to the error.
SCOPE

This note is intended for general audience as a starting point to check the meaning of "ORA-16597". It does not give detailed information about the error and does not give error message text for versions below 9.2 .
DETAILS

Error Text, Cause and Action from Message File/s for ORA-16597

Versions 12.1

Error:  ORA-16597 Oracle Data Guard broker detects two or more primary databases 
---------------------------------------------------------------------------
Cause:  The Oracle Data Guard broker detected two or more primary databases in 
    the broker configuration and could not continue. 
Action: Contact Oracle Support Services. 
Versions 11.1, 11.2

Error:  ORA-16597 Data Guard broker detects two or more primary databases 
---------------------------------------------------------------------------
Cause:  The Data Guard broker detected two or more primary databases in the 
    broker configuration and could not continue. 
Action: Contact Oracle Support Services. 
Versions 10.2

Error:  ORA-16597 Data Guard broker detects two or more primary databases 
---------------------------------------------------------------------------
Cause:  The Data Guard broker detected two or more primary databases in the 
    broker configuration and cannot continue. 
Action: Contact Oracle Support Services. 
Versions 10.1

Error:  ORA-16597 Data Guard broker detects two or more primaries. 
---------------------------------------------------------------------------
Cause:  The Data Guard broker detected two or more primary databases in the 
    broker configuration and cannot continue. 
Action: Contact Oracle Support Services. 
Versions 9.2

Error:  ORA-16597 Data Guard broker detects two or more primaries 
---------------------------------------------------------------------------
Cause:  The Data Guard broker has detected two or more primaries in the 
    configuration and cannot continue. 
Action: Contact Oracle Support Services. 
Search Links for ORA-16597

The links below can be used to locate ORA-16597 in the documentation, and to search for documents that give more information about the error.
Search MOS for "ORA-16597 Troubleshooting" 

Search 12.1 documentation for ORA-16597
Search 11.2 documentation for ORA-16597
Search 11.1 documentation for ORA-16597
Search 10.2 documentation for ORA-16597