Getting above ORA-01555 error while running batch job on standby active dataguard version 126.96.36.199 and only standby database will get very slow once batch job has started, same time primary database will work fine.
Once restarted the standby database, Job will work fine but second day again we will face same issue(ora-01555).
Note: We are getting same error ORA-01555 even after added space on tbs UNDOTBS1,TEMP and increased the undo_retention parameter. There no locking,blocking session are exist and only we are getting above. Didn't get any clue from .trc or drc files also.