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ORA-16816 after switchover 2 node RAC -> single standby

Petr KuprianovFeb 10 2026

Oracle 19c.

Primary - 2 node RAC, ASM

Standby - single instance, ASM

After switchover, getting following:

DGMGRL> show configuration

Configuration - my_dg_config

Protection Mode: MaxPerformance
Members:
sv_stby - Primary database
sv - Physical standby database
Error: ORA-16816: incorrect database role

Fast-Start Failover: Disabled

Configuration Status:
ERROR (status updated 3 seconds ago)

DGMGRL> show database sv

Database - sv

Role: PHYSICAL STANDBY
Intended State: APPLY-ON
Transport Lag: 0 seconds (computed 1 second ago)
Apply Lag: 0 seconds (computed 1 second ago)
Average Apply Rate: 0 Byte/s
Real Time Query: OFF
Instance(s):
SV1 (apply instance)
SV2

Database Error(s):
ORA-16816: incorrect database role

Database Status:
ERROR

DGMGRL> show database sv_stby

Database - sv_stby

Role: PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
SV

Database Status:
SUCCESS

In alert.log:

TT04 (PID:65793): Error 12528 received logging on to the standby
TT04 (PID:65793): Error 12528 attaching to RFS for reconnect
2026-02-10T21:18:34.855057+04:00
Errors in file /oracle/diag/rdbms/sv_stby/SV/trace/SV_tt04_65793.trc:
ORA-03135: connection lost contact
TT04 (PID:65793): Error 3135 for LNO:1 to 'sv'
2026-02-10T21:18:34.861955+04:00
Errors in file /oracle/diag/rdbms/sv_stby/SV/trace/SV_tt04_65793.trc:
ORA-03135: connection lost contact

Trace /oracle/diag/rdbms/sv_stby/SV/trace/SV_tt04_65793.trc:

*** 2026-02-10T21:18:34.845337+04:00 (CDB$ROOT(1))
krsu_upi_status: RFS network connection lost at host 'sv', error=3135
krsb_stream_dispatch: No active stream for remote target:2, returning
krsu_upi_status: Error 3135 writing archive log file at host 'sv'
*** 2026-02-10 21:18:34.845488 [krsh.c:6411]
Attempting LAD:2 network reconnect (3135)
krsu_upi_rcon: Retry every 5 seconds up to 1 times
krsu_reinit_conn: OCIServerAttach failed -1
krsu_dump_oci_emsg: Detailed OCI error val is 12528 and errmsg is 'ORA-12528: TNS:listener: all appropriate instances
are blocking new connections

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Added on Feb 10 2026
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