JOB Related Tables
===========================
DBA_JOBS/ALL_JOBS/USER_JOBS - Existing Jobs
DBA_JOBS_RUNNING - Currently running or "stuck" jobs.
===========================
DBMS_JOB package
===========================
DBMS_JOB is used to create/change/execute jobs.
As from Oracle 10G DBMS_JOB package was superseded by the DBMS_SCHEDULER package.
commit - You must issue a commit after each DBMS_JOB.XXX procedure.
===========================
Create a new job
===========================
DECLARE
v_job_number NUMBER(10);
BEGIN
DBMS_JOB.SUBMIT (JOB => v_job_number,
WHAT => 'MY_PACKAGE.my_proc;',
NEXT_DATE => TRUNC(SYSDATE + 1)+1.5/24+30/1440,
INTERVAL => 'TRUNC(SYSDATE + 1)+1.5/24+30/1440'
);
COMMIT;
END;
/
A more "full" version:
v_job_number NUMBER(10);
v_instance_number NUMBER(10);
BEGIN
-- Optional - for RAC only -- Get the instance number for use with DBMS_JOB.SUBMIT
SELECT instance_number
INTO v_instance_number
FROM v$instance;
-- Submit a job to begin tonight at midnight, and execute
-- every half-hour thereafter
DBMS_JOB.SUBMIT (JOB => v_job_number,
WHAT => 'MANAGER.daily_checks;',
NEXT_DATE => TRUNC(SYSDATE + 1)+3/24+30/1440,
INTERVAL => 'TRUNC(SYSDATE + 1)+3/24+30/1440',
NO_PARSE => TRUE,
INSTANCE => v_instance_number,
FORCE => NULL
);
COMMIT;
DBMS_OUTPUT.PUT_LINE('The job number is: '||v_job_number);
END;
/
===========================
Recreate existing job, keeping job ID
===========================
DBMS_JOB.ISUBMIT - allows to create job with a specific number.
BEGIN
DBMS_JOB.REMOVE(1521);
COMMIT;
END;
/
BEGIN
DBMS_JOB.ISUBMIT
( job => 1521
,what => 'MY_PACKAGE.MY_PROC;'
,next_date => TRUNC(SYSDATE)+8/24+45/1440
,interval => 'TRUNC(SYSDATE+1) +8/24+45/1440'
);
COMMIT;
END;
/
===========================BEGIN
DBMS_JOB.REMOVE(1521);
COMMIT;
END;
/
BEGIN
DBMS_JOB.ISUBMIT
( job => 1521
,what => 'MY_PACKAGE.MY_PROC;'
,next_date => TRUNC(SYSDATE)+8/24+45/1440
,interval => 'TRUNC(SYSDATE+1) +8/24+45/1440'
);
COMMIT;
END;
/
Update existing job
===========================
DBMS_JOB.CHANGE - To change existing job
Example: Update existing job to run Daily at 01:00.
DECLARE
v_job_id NUMBER;
v_what VARCHAR2(4000);
BEGIN
SELECT job, what
INTO v_job_id, v_what
FROM USER_JOBS
WHERE UPPER(WHAT) LIKE '%MY_PACKAGE.MY_PROC%';
DBMS_JOB.CHANGE(v_job_id,
v_what,
TRUNC(SYSDATE+1)+1/24,
'TRUNC(SYSDATE+1)+1/24');
COMMIT;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE('ERROR: ' || SQLERRM);
END;
Change job schedule by example:
- Run once a week, at 1:00 AM
NEXT_DATE => TRUNC(SYSDATE+7)+(1/24)
INTERVAL => 'TRUNC(SYSDATE+7)+(1/24)',
DBMS_JOB.SUBMIT
(JOB => v_job_number,
WHAT => 'Purge_Subscriber(365);',
NEXT_DATE =>NEXT_DAY(TRUNC(ADD_MONTHS(TRUNC(SYSDATE),1),'MON')+(3/24),'MONDAY'),
INTERVAL =>'NEXT_DAY(TRUNC(ADD_MONTHS(TRUNC(SYSDATE),1),''MON'')+(3/24),''MONDAY'')',
NO_PARSE => TRUE,
INSTANCE => v_instance_number,
FORCE => NULL
);
===========================
Execute existing job
===========================
Option 1. Run existing job immediately.
BEGIN
DBMS_JOB.run(221);
COMMIT;
END;
/
Where 221 is the job_id.
Option 2. Run existing job setting next dat to next minute in scheduler.
BEGIN
DBMS_JOB.NEXT_DATE(221,SYSDATE + 1/1440);
COMMIT;
END;
============================
How to make sure the job has started to run
============================
A. When job has started to run, the fields THIS_DATE and THIS_SEC are updated, and are no longer NULL.
B. Query DBA_JOBS_RUNNING.
============================
A. When job has started to run, the fields THIS_DATE and THIS_SEC are updated, and are no longer NULL.
B. Query DBA_JOBS_RUNNING.
============================
Delete existing job
============================
BEGIN
DBMS_JOB.remove(221);
COMMIT;
END;
/
============================
Suspend job from running
============================
Set the NEXT_DATE to some distant date in the future.
BEGIN
DBMS_JOB.NEXT_DATE(331,TO_DATE('40000101','YYYYMMDD'));
COMMIT;
END;/
Parameters:
============================
JOB - Is a unique key. Populated from Sequence owned by SYS
WHAT - Is the code that would be executed
NEXT_DATE - The date that this job will next be executed.
INTERVAL - Would become NEXT_DATE after the first execution.
Upon execution, Oracle would set the
NEXT_DATE value, by the value taken from INTERVAL, using following SQL:
SELECT INTERVAL INTO NEXT_DATE FROM DUAL;
THIS_DATE and THIS_SEC - the DATETIME and TIME when the job started to run.
INSTANCE - The default is zero - All Instances.
FORCE - is related to a situation when INSTANCE is not zero.
============================
To kill a running job
============================
A. View Valid Running Jobs:
SELECT * FROM DBA_JOBS_RUNNING;
B. View Zombie Running Jobs:
All the zombie jobs have still active session, but the job is not running.
SELECT 'kill -9 '||PROCESSES.spid AS LINUX_KILL,
'ALTER SYSTEM KILL SESSION
'ALTER SYSTEM KILL SESSION '||''''||SESSIONS.sid||','||SESSIONS.serial#||''''||' IMMEDIATE;' AS KILL_SESSION,
PROCESSES.spid,
PROCESSES.username AS osuser,
PROCESSES.program,
SESSIONS.sid,
SESSIONS.serial#,
SESSIONS.username,
SESSIONS.sql_id,
SESSIONS.logon_time,
SESSIONS.event,
RUNNING_JOBS.job
--PROCESSES.*,
--SESSIONS.*,
--RUNNING_JOBS.*
FROM V$PROCESS PROCESSES,
V$SESSION SESSIONS,
DBA_JOBS_RUNNING RUNNING_JOBS
WHERE PROCESSES.program like '%J0%'
AND PROCESSES.addr=SESSIONS.paddr
AND SESSIONS.sid = RUNNING_JOBS.sid(+)
AND SESSIONS.schemaname <> 'SYS'
AND SESSIONS.type = 'USER'
AND RUNNING_JOBS.job IS NULL
ORDER BY SESSIONS.SQL_ID;
C. View Zombie Running Jobs:
Kill Long Running Jobs SQL
SELECT 'ALTER SYSTEM KILL SESSION ' || SUBSTR(''''||V_SESSION.sid||','||V_SESSION.serial#||'''', 1,15)||' IMMEDIATE;' AS ORACLE_KILL,
'kill -9 '||V_PROCESS.spid AS LINUX_KILL,
V_SESSION.machine AS "SERVER",
V_SESSION.osuser AS OS_USER,
V_SESSION.status,
V_SESSION.program,
V_SESSION.sid,
V_SESSION.serial#,
V_PROCESS.spid,
V_SESSION.username,
DBA_JOBS.schema_user,
DBA_JOBS.job,
DBA_JOBS.what,
TO_CHAR(V_SESSION.logon_time,'YYYYMMDD hh24:mi:ss') AS logon_time
FROM V$SESSION V_SESSION,
V$PROCESS V_PROCESS,
DBA_JOBS_RUNNING STUCK_JOBS,
DBA_JOBS
WHERE V_PROCESS.addr = V_SESSION.paddr
AND V_SESSION.type != 'BACKGROUND'
AND V_SESSION.sid = STUCK_JOBS.sid
AND DBA_JOBS.job = STUCK_JOBS.job(+)
AND logon_time < (SYSDATE - 45/1440)
AND UPPER(DBA_JOBS.what) IN ('EXT_MOCO.SCHEDULE;','EXT_OVMD.SCHEDULE;','EXT_IPN.SCHEDULE;','EXT_GLR.SCHEDULE;','EXT_SPARX.SCHEDULE;')
INSTANCE - The default is zero - All Instances.
FORCE - is related to a situation when INSTANCE is not zero.
============================
To kill a running job
============================
A. View Valid Running Jobs:
SELECT * FROM DBA_JOBS_RUNNING;
B. View Zombie Running Jobs:
All the zombie jobs have still active session, but the job is not running.
SELECT 'kill -9 '||PROCESSES.spid AS LINUX_KILL,
'ALTER SYSTEM KILL SESSION
'ALTER SYSTEM KILL SESSION '||''''||SESSIONS.sid||','||SESSIONS.serial#||''''||' IMMEDIATE;' AS KILL_SESSION,
PROCESSES.spid,
PROCESSES.username AS osuser,
PROCESSES.program,
SESSIONS.sid,
SESSIONS.serial#,
SESSIONS.username,
SESSIONS.sql_id,
SESSIONS.logon_time,
SESSIONS.event,
RUNNING_JOBS.job
--PROCESSES.*,
--SESSIONS.*,
--RUNNING_JOBS.*
FROM V$PROCESS PROCESSES,
V$SESSION SESSIONS,
DBA_JOBS_RUNNING RUNNING_JOBS
WHERE PROCESSES.program like '%J0%'
AND PROCESSES.addr=SESSIONS.paddr
AND SESSIONS.sid = RUNNING_JOBS.sid(+)
AND SESSIONS.schemaname <> 'SYS'
AND SESSIONS.type = 'USER'
AND RUNNING_JOBS.job IS NULL
ORDER BY SESSIONS.SQL_ID;
C. View Zombie Running Jobs:
Kill Long Running Jobs SQL
SELECT 'ALTER SYSTEM KILL SESSION ' || SUBSTR(''''||V_SESSION.sid||','||V_SESSION.serial#||'''', 1,15)||' IMMEDIATE;' AS ORACLE_KILL,
'kill -9 '||V_PROCESS.spid AS LINUX_KILL,
V_SESSION.machine AS "SERVER",
V_SESSION.osuser AS OS_USER,
V_SESSION.status,
V_SESSION.program,
V_SESSION.sid,
V_SESSION.serial#,
V_PROCESS.spid,
V_SESSION.username,
DBA_JOBS.schema_user,
DBA_JOBS.job,
DBA_JOBS.what,
TO_CHAR(V_SESSION.logon_time,'YYYYMMDD hh24:mi:ss') AS logon_time
FROM V$SESSION V_SESSION,
V$PROCESS V_PROCESS,
DBA_JOBS_RUNNING STUCK_JOBS,
DBA_JOBS
WHERE V_PROCESS.addr = V_SESSION.paddr
AND V_SESSION.type != 'BACKGROUND'
AND V_SESSION.sid = STUCK_JOBS.sid
AND DBA_JOBS.job = STUCK_JOBS.job(+)
AND logon_time < (SYSDATE - 45/1440)
AND UPPER(DBA_JOBS.what) IN ('EXT_MOCO.SCHEDULE;','EXT_OVMD.SCHEDULE;','EXT_IPN.SCHEDULE;','EXT_GLR.SCHEDULE;','EXT_SPARX.SCHEDULE;')
D. SQL to kill long running job session
SELECT ''''||DBA_JOBS_RUNNING.SID||','||V_SESSIONS.serial#||'''' AS SID_SERIAL,
V_PROCESS.SPID AS PROCESS_ID,
DBA_JOBS_RUNNING.JOB,
DBA_JOBS.what what,
DBA_JOBS_RUNNING.THIS_DATE,
DBA_JOBS_RUNNING.THIS_SEC,
DBA_JOBS.FAILURES
FROM DBA_JOBS_RUNNING,
DBA_JOBS,
V$SESSION V_SESSIONS,
V$PROCESS V_PROCESS
WHERE DBA_JOBS_RUNNING.job = DBA_JOBS.job (+)
AND DBA_JOBS_RUNNING.sid = V_SESSIONS.sid (+)
AND V_SESSIONS.paddr = V_PROCESS.addr
V_PROCESS.SPID AS PROCESS_ID,
DBA_JOBS_RUNNING.JOB,
DBA_JOBS.what what,
DBA_JOBS_RUNNING.THIS_DATE,
DBA_JOBS_RUNNING.THIS_SEC,
DBA_JOBS.FAILURES
FROM DBA_JOBS_RUNNING,
DBA_JOBS,
V$SESSION V_SESSIONS,
V$PROCESS V_PROCESS
WHERE DBA_JOBS_RUNNING.job = DBA_JOBS.job (+)
AND DBA_JOBS_RUNNING.sid = V_SESSIONS.sid (+)
AND V_SESSIONS.paddr = V_PROCESS.addr
SELECT p.spid, s.osuser, s.program
FROM v$process p,
v$session s
WHERE p.addr=s.paddr
D. Kill Oracle process on host.
Take the SPID from the SQL above. For example, 2343.
Logon to the Oracle host server.
Option A.
Using Linux kill command
ps -ef | grep <p.spid>kill -9 <p.spid>
Using Oracle orakill utility
for example:
orakill orcl 2343
Optionally - Check broken field: Y/N
Set job broken field to Y.
Oracle does not submit broken jobs.
However if you set broken to 'Y' wile the job is still running, Oracle would update broken status to 'N' when the jobs completes.
Oracle does not submit broken jobs.
However if you set broken to 'Y' wile the job is still running, Oracle would update broken status to 'N' when the jobs completes.
DBMS_JOB.BROKEN ( job IN BINARY_INTEGER, broken IN BOOLEAN, [next_date IN DATE]);
COMMIT;
For example:
DBMS_JOB.BROKEN(1521,FALSE,SYSDATE+1/1440);
COMMIT;
===========================
Change job interval
===========================
BEGIN
DBMS_JOB.INTERVAL(7,'TRUNC(SYSDATE+1) + 22 / 24');
COMMIT;
END;
/
===========================
Fix a Broken job
===========================
When a job finishes to run, Oracle set the job's status to normal after the job completes.
The way to "fix"a broken job, is to:
Option A. - Run the job via DBMS_JOB.run
For example:
BEGIN
DBMS_JOB.run(152);
commit;
END;
/
Option B. - Set job Broken indicator to false, and schedule the job to run within next minutes, via DBMS_JOB.broken
DBMS_JOB.BROKEN(JOB=>&job_no, broken=>FALSE, NEXT_DATE=>SYSDATE + &when_plus_sysdate);
For example:
BEGIN
BEGIN
DBMS_JOB.BROKEN(152, FALSE, SYSDATE + 2/1440);
commit;
commit;
END;
/
More detailed example:
More detailed example:
BEGIN
DBMS_JOB.BROKEN(JOB => 152,
BROKEN => FALSE,
NEXT_DATE => TO_DATE('20141209 210000','YYYYMMDD hh24miss')
);
commit;
BROKEN => FALSE,
NEXT_DATE => TO_DATE('20141209 210000','YYYYMMDD hh24miss')
);
commit;
END;
/
===========================
Troubleshooting===========================
What to check if job is not running.
1. Check latest trc file under <user_dump_dest>
SELECT value from V$PARAMETER WHERE name = 'core_dump_dest'
2. Check alert.log
3. Check if number of running processes exceed value set for JOB_QUEUE_PROCESSES.
If the number of current job processes reached JOB_QUEUE_PROCESSES value, new job processes would not start.
- Scheduled job is not starting to execute.
- No error in alert log.
SELECT name, value
FROM V$PARAMETER
WHERE name LIKE '%job%';
SELECT COUNT(*)
FROM V$PROCESS PROCESSES
WHERE PROCESSES.program LIKE '%(J0%)' --<J Zero>
4. NEXTDATE is set to 01/01/4000
Whenever job BROKEN changes to 'Y', job NEXT_DATE is set by Oracle to 01/01/4000, to prevent the job from running.
5. Job next_date might be set to run in the past
ORA-12012,ORA-12005
Following errors are are thrown into Oracle alert log every few minutes:
Errors in file /oracle/admin/orainst/diag/rdbms/myserver/orainst/trace/orainst_j000_24773144.trc:
ORA-12012: error on auto execute of job 6
ORA-12005: may not schedule automatic refresh for times in the
past
Errors in file
/oracle/admin/orainst/diag/rdbms/myserver/orainst/trace/orainst_j000_56164698.trc:
ORA-12012: error on auto execute of job 7
ORA-12005: may not schedule automatic refresh for times in the
past
Looking into USER_JOBS, jobs 6 and 7 have following value in INTERVAL:
TRUNC(SYSDATE) + 22 / 24
This value is wrong.
It should be:
TRUNC(SYSDATE+1) + 22 / 24
===========================
Find and Kill long running Jobs===========================
SQL A.
Find an kill zombie processes of a long finished Job
SELECT 'kill -9 '||PROCESSES.spid AS LINUX_KILL,
PROCESSES.spid, PROCESSES.program,
SESSIONS.username, SESSIONS.sql_id, SESSIONS.logon_time, SESSIONS.event
FROM v$process PROCESSES, V$SESSION SESSIONS
WHERE PROCESSES.program like '%J0%'
AND PROCESSES.addr=SESSIONS.paddr
AND SESSIONS.schemaname <> 'SYS'
AND SESSIONS.type = 'USER'
AND PROCESSES.background IS NULL
AND SESSIONS.sid NOT IN (SELECT sid FROM DBA_JOBS_RUNNING)
AND logon_time < SYSDATE-1/4
SELECT
'ALTER SYSTEM KILL SESSION '||SUBSTR(''''||SESSIONS.sid||','||SESSIONS.serial#||'''',1,15)||' IMMEDIATE;' AS "Kill Session",
'kill -9 '||PROCESSES.spid AS "Linux kill",
JOBS_RUNNING.job, JOBS_RUNNING.failures,
DBA_JOBS.what,
JOBS_RUNNING.this_date,
SYSDATE,
ROUND((SYSDATE - JOBS_RUNNING.this_date) * 24 * 60)
FROM DBA_JOBS_RUNNING JOBS_RUNNING,
DBA_JOBS,
V$SESSION SESSIONS,
V$PROCESS PROCESSES
WHERE JOBS_RUNNING.job = DBA_JOBS.job
AND JOBS_RUNNING.sid = SESSIONS.sid
AND SESSIONS.paddr = PROCESSES.addr
AND ((DBA_JOBS.what IN
('job1;', 'job2;', 'job3;', 'ext_tre.Schedule;')
AND (SYSDATE - JOBS_RUNNING.this_date) * 24 * 60 > 30)
===========================
Find and Kill session===========================
SELECT 'ALTER SYSTEM KILL SESSION '||SUBSTR(''''||s.sid||','||s.serial#||'''',1,15)||' IMMEDIATE;' AS "Kill Session",
'kill -9 '||p.spid AS "Linux kill",
p.spid, s.osuser, s.program
'kill -9 '||p.spid AS "Linux kill",
p.spid, s.osuser, s.program
FROM v$process p,
v$session s
WHERE p.addr=s.paddr
===========================Configuring DBMS_JOB with JOB_QUEUE_PROCESSES
===========================
JOB_QUEUE_PROCESSES initialization parameter specifies the maximum number of processes that can be created for the execution of jobs.
In Oracle 11G, default value for JOB_QUEUE_PROCESSES is 1000
Setting JOB_QUEUE_PROCESSES to 0 disables DBMS_JOB jobs.
To change setting:
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=20 SCOPE=BOTH
The effect is immediate, no need to restart Oracle Instance.
When using Oracle Scheduler, there is an additional parameter that controls maximum of Jobs that are running under Oracle Scheduler.
This parameter is called MAX_JOB_SLAVE_PROCESSES
Configuring DBMS_JOB Reference
===========================
Interval for a job
===========================
Run job every 15 minutes
BEGIN
DBMS_JOB.NEXT_DATE(7,TRUNC(SYSDATE,'HH24') + ( ( 15 + ( 15 * FLOOR(TO_NUMBER(TO_CHAR(SYSDATE,'MI')) / 15))) / 1440)
DBMS_JOB.INTERVAL(7,'TRUNC(SYSDATE,''HH24'') + ( ( 15 + ( 15 * FLOOR(TO_NUMBER(TO_CHAR(SYSDATE,''MI'')) / 15))) / 1440)
');
COMMIT;
END;
/
Run job every 6 hours
BEGIN
DBMS_JOB.INTERVAL(7,'TRUNC(SYSDATE,''HH24'') + 6/24');
COMMIT;
END;
/
===========================
Run DBMS_JOB for another user
===========================
When attempting to run a job that belongs to another user, even as privileged user, one would get this error message:
ORA-23421: job number 123 is not a job in the job queue
To overcome this, need to use DBMS_SYS_SQL Package.
DBMS_SYS_SQL Package allows user A to run SQL statements as user B.
DBMS_SYS_SQL is owned by SYS, and first must be granted.
sqlplus / as sysdba
GRANT EXECUTE ON SYS.DBMS_SYS_SQL TO admin_user;
Now, log as admin_user, and use DBMS_SYS_SQL, in a PL/SQL block.
In this example, all jobs of a certain type are executed under all users.
DECLARE
v_uid NUMBER;
v_result INTEGER;
v_sql_template VARCHAR2(1000) := 'BEGIN DBMS_JOB.BROKEN(my_job_id, FALSE, SYSDATE+1/1440); COMMIT; END; ';
v_sqltext VARCHAR2(1000);
v_myint INTEGER;
CURSOR broken_jobs_cur IS SELECT schema_user, job FROM DBA_JOBS WHERE what = 'SUPPORT_UTIL_PKG.SUPPORT_COUNTERS_PRC;' AND broken = 'Y';
BEGIN
FOR broken_jobs_rec IN broken_jobs_cur loop
SELECT user_id INTO v_uid FROM ALL_USERS WHERE username = broken_jobs_rec.schema_user;
v_sqltext := REPLACE (v_sql_template,'my_job_id',broken_jobs_rec.job);
v_myint := SYS.DBMS_SYS_SQL.OPEN_CURSOR();
SYS.DBMS_SYS_SQL.PARSE_AS_USER(v_myint, v_sqltext, DBMS_SQL.NATIVE, v_uid);
v_result := SYS.DBMS_SYS_SQL.EXECUTE(v_myint);
SYS.DBMS_SYS_SQL.CLOSE_CURSOR(v_myint);
COMMIT;
END LOOP;
END ;
/
===========================
permissions
===========================
Error:
When trying to create job with DBMS_JOB.submit:
ERROR at line 1:
ORA-27486: insufficient privileges
ORA-06512: at "SYS.DBMS_ISCHED", line 9387
ORA-06512: at "SYS.DBMS_ISCHED", line 9376
ORA-06512: at "SYS.DBMS_ISCHED", line 175
ORA-06512: at "SYS.DBMS_ISCHED", line 9302
ORA-06512: at "SYS.DBMS_IJOB", line 196
ORA-06512: at "SYS.DBMS_JOB", line 168
ORA-06512: at line 4
GRANT CREATE JOB TO USER;
===========================
Drop or Run a job under another schema
===========================
Drop or Run a job under another schema
===========================
DBMS_IJOB can be used to alter jobs under another schema
DBMS_IJOB can have following procedures:
SYS.DBMS_IJOB.remove(job_id);
SYS.DBMS_IJOB.broken(job_id,true);
SYS.DBMS_IJOB.run(job_id);
For Example:
BEGIN
SYS.DBMS_IJOB.REMOVE (1);
commit;
END;
/
===========================
See jobs in Linux
===========================
See jobs in Linux
===========================
COL LAST_RUN FOR A20
COL NEXT_DATE FOR A20
COL WHAT FOR A80
COL SCHEMA_USER FOR A30
SET PAGESIZE 1000
SET LINESIZE 180
SELECT job, schema_user, TO_CHAR(last_date,'YYYYMMDD')||' '||last_sec last_run, TO_CHAR(next_date,'YYYYMMDD hh24:mi:ss') next_date, what
FROM DBA_JOBS
ORDER BY TO_CHAR(last_date,'YYYYMMDD')||' '||last_sec;
Documentation:
DBMS_JOB Package
DBA_JOBS Table
Run the job in every minute
SELECT TRUNC(SYSDATE,'HH24')+((floor(to_number(to_char(SYSDATE,'MI'))/1)+1)*1)/(24*60)
FROM DUAL;
Run the job every 15 minutes
SELECT TRUNC(SYSDATE,'HH24') + (TRUNC(TO_NUMBER(TO_CHAR(SYSDATE,'mi'))/15)+1) * 15/1440
FROM DUAL;
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