Error: ORA-16627: operation disallowed since no standby databases would remain to support protection mode

How to Change DataGuard Protection Mode using dgmgrl

DGMGRL> show configuration verbose;
Configuration - APX1T_dg
Protection Mode: MaxPerformance
Members:
APX1TP - Primary database
    APX1TS - Physical standby database

DGMGRL> EDIT CONFIGURATION SET PROTECTION MODE AS MAXAVAILABILITY;
Error: ORA-16627: operation disallowed since no standby databases would remain to support protection mode
Failed.
Note:- Protection mode maximum availability and maximum protection is only supported with LogXptMode=SYNC and therefore before changing the protection mode you must change the LogXptMode to SYNC

DGMGRL> SHOW DATABASE 'APX1TS' 'LogXptMode';
LogXptMode = 'ASYNC'

DGMGRL> edit database 'APX1TS' set property LogXptMode='SYNC';
Property "logxptmode" updated

DGMGRL> SHOW DATABASE 'APX1TS' 'LogXptMode';
LogXptMode = 'SYNC'
DGMGRL> EDIT CONFIGURATION SET PROTECTION MODE AS MAXAVAILABILITY;
Succeeded.
DGMGRL> show configuration;
Configuration - APX1T_dg
Protection Mode: MaxAvailability
Members:
APX1TP - Primary database
    APX1TS - Physical standby database
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS   (status updated 7 seconds ago)

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