just in case you have a similar situation as I had:
- Oracle 18c
- Dataguard Physical Stby
- Log Sequences in question markled as "applied = yes" in v$archived_log
- but not applied on standby in reality
- Maybe Archive Gap that could not be resolved by FAL because FRA policies
deleted the archives due to "applied = yes"
=> They changed the way how checkpoints work for MRP (now different to primary)
tl/dr: Oracle Dev said: " In 18.1 onward, time-based media recovery checkpoint
is the default style of checkpoint (it's enabled via the hidden parameter
_time_based_rcv_ckpt_target=180) meaning that by default, media recovery will
perform a checkpoint every 180 seconds, instead of at every log boundary. "
Martin Klier // Performing Databases GmbH
Managing Partner // Senior DB Consultant
Oracle ACE Director
martin.klier@xxxxxxxxxxxxxxxxx // https://www.performing-databases.com