Questions of DST, part two

Oracle 11.20.1.0 SE - One
Oracle Linux 5.6 x 86-64

Cut to the Chase. Most of our tasks in the Scheduler is set so that start_date, last_start_date, and next_run_date all specify them the zone with a fixed offset. As a result, the first execution after the time change DST, they ran an hour initially, but then calculation for the next execution corrected and they found running at the scheduled time.

Finally, almost.

We have two application schemas that have Task Scheduler.

Jobs in a schema is featured as above.

But all the work of the other schema to continue to run an hour earlier.

the above can be seen in the result of this query:
select
     instance_name
,     systimestamp
from
     v$instance;
--
select 
     owner
,     job_name
,     log_date
,     status
from
     dba_scheduler_job_log
here   log_date > sysdate - 10
  and   owner not in ('EXFSYS',
                      'ORACLE_OCM',
                      'PERFSTAT',
                      'SYS'
                      )
order by
     owner
,     job_name
,     log_date
;
Very easy to simply go to the bottom of the column LOG_DATE and see time to change.

For my first two questions is - can someone explain the behavior above, in particular the inconsistency in a single schema 'cure' jobs themselves after the first run after the time change, but another schema employment continuing to run an hour earlier.

I don't know if she's wearing on her or not, but most of the jobs (two patterns) is provided with a local function to "frequency" that uses a decimal representation of the time (ie: WEEKLY(.4583,'SATURDAY'))


And a second question - what are the things that affect the representation of time zone in the start_date when defining a new job? Our programmer creates / manages jobs using SQL Navigator, and there is no provision in the GUI it to specify a specific time zone or (offset vs name) method to represent a time zone. I read that there are some influences on the client side, but have not restored that right away.

Try

SELECT CAST (SYSDATE AS TIMESTAMP WITH TIME ZONE) FROM dual;

you will see the time zone.

Or a more detailed example

ALTER SESSION SET TIME_ZONE='Europe/Prague';
SELECT dbms_scheduler.stime, sysdate, systimestamp, current_timestamp,CAST (SYSDATE AS TIMESTAMP WITH TIME ZONE), CAST (to_date('1.1.2012','dd.mm.yyyy') AS TIMESTAMP WITH TIME ZONE) FROM dual;

ALTER SESSION SET time_zone='Asia/Bangkok';
SELECT dbms_scheduler.stime, sysdate, systimestamp, current_timestamp,CAST (SYSDATE AS TIMESTAMP WITH TIME ZONE), CAST (to_date('1.1.2012','dd.mm.yyyy') AS TIMESTAMP WITH TIME ZONE) FROM dual;

ALTER SESSION SET time_zone='-6:00';
SELECT dbms_scheduler.stime, sysdate, systimestamp, current_timestamp,CAST (SYSDATE AS TIMESTAMP WITH TIME ZONE), CAST (to_date('1.1.2012','dd.mm.yyyy') AS TIMESTAMP WITH TIME ZONE) FROM dual;

You can see that DATE to TIMESTAMP WITH TIME ZONE conversion session TIME_ZONE.

Tags: Database

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