ORA-12012: error on auto execute of job 55536

In alert log we are getting the error, So we checked the job number which is causing the error. If it is not needed then drop it or disable it by dbms_scheduler procedure.

For checking the status of job when its last run and owner and inform to application team if its belong to application job:

select
d.job_name,
d.job_action,d.NEXT_RUN_DATE,d.OWNER
from
dba_scheduler_jobs d,
sys.scheduler$_job s
where
d.job_action = s.program_action
and
s.obj# = 55536


If error related to Auto Gather stats jobs:
ORA-12012: error on auto execute of job "SYS"."ORA$AT_OS_OPT_SY_nn"

Error:

ORA-12012: error on auto execute of job “SYS”.”ORA$AT_OS_OPT_SY_”

Solution
1. Run the following query for checking advisory package:

col name for a30
select name, ctime, how_created
from sys.wri$_adv_tasks
where owner_name = 'SYS'
and name in ('AUTO_STATS_ADVISOR_TASK','INDIVIDUAL_STATS_ADVISOR_TASK');

No rows selected

2. If no row found then initialize the package with following commands.

EXEC dbms_stats.init_package();

3. Verify the package create. It will fixed the issue.

col name for a30
select name, ctime, how_created
from sys.wri$_adv_tasks
where owner_name = 'SYS'
and name in ('AUTO_STATS_ADVISOR_TASK','INDIVIDUAL_STATS_ADVISOR_TASK');

NAME                           CTIME     HOW_CREATED                            
------------------------------ --------- --------------       
AUTO_STATS_ADVISOR_TASK        05-DEC-18 CMD                                    
INDIVIDUAL_STATS_ADVISOR_TASK  05-DEC-18 CMD