After a database server detects an HDR failure, it writes a message to its message log (for example, DR: receive error) and turns data replication off. If an HDR failure occurs, the HDR connection between the two database servers is dropped and the secondary database server remains in read-only mode.
If the secondary database server remains online after a high-availability data-replication failure, and the DRAUTO configuration parameter is set to 1 (RETAIN_TYPE), the type of that database server changes automatically to standard. If DRAUTO is set to 0 (off), the secondary database server periodically attempts to reestablish communication with the primary database server. If DRAUTO is set to 2 (REVERSE_TYPE), the secondary database server becomes a primary database server as soon as the connection ends when the old primary server fails, rather than when the old primary server is restarted
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