# Concurrent request scheduling explained

It’s quite an interesting way that’s used to implement concurrent request schedules in Oracle Applications. In this post I’ll describe how “Periodic” and “On Specific Day” type of schedules are stored in the Database and if you will be patient enough to read all the story, I’ll give you a query that can be used to report all the request schedules in the environment.

I’ll pay attention to the repeating schedules only as requests submitted for one-time execution are not too interesting, basically, they use the fnd_concurrent_requests.requested_start_date field to store the time the request has to be executed. This field is used in repeating schedules to specify the time of next execution.

There are just 2 normal types of repeating schedules.

Defining a ‘periodic’ schedule

Periodic – the request is submitted for execution in pre-defined intervals of specified number of months, weeks, days, hours or minutes.

Definig a ‘on Specific Days’ schedule

On Specific Days – user can choose exact dates of month or days of week when the request will be executed. There’s an option to schedule requests for the last day of months too.

There’s also a 3rd option – Advanced – this is a special option that implements possibility to run requests based on schedules, that depend on different financial calendars and financial periods. This kind of scheduling is rarely used as it’s available in few Applications products only, e.g. GL. These schedules are managed by Scheduler/Prereleaser Concurrent Manager.

There are 2 tables invoved in storing the information about schedules: fnd_concurrent_requests that stores all basic information about concurrent requests including the next time the request is scheduled for, andfnd_conc_release_classes that stores information about the schedules. Both tables can be joined byrelease_class_id.

The fields we are interested in are:
fnd_conc_release_classes.CLASS_TYPE
– contains value ‘P’ for “Periodic” schedules, “S” – for “on Specific Days” schedules and “X” – for advanced schedules.
fnd_conc_release_classes.DATE1 –
start date of the schedule (“Start at” field in the form)
fnd_conc_release_classes.DATE2 –
end date of the schedule (“End at” field in the form) – this information is doubled in fnd_concurrent_requests.resubmit_end_date.

fnd_conc_release_classes.CLASS_INFO – this is the most interesting field as it contains all the information needed for reschedulingThe format of the field depends on the type of schedule.

“PERIODIC” schedule

In case of Periodic schedule fnd_conc_release_classes.CLASS_INFO field contains values like “2:D:S” orX:Y:Z where:

• X – number of months/weeks/days/hours/minutes the request has to be rescheduled from prior run.
• Y – contains a single letter representing units
• “M” – months;
• “D” – days;
• “H” – hours;
• “N” – minutes;
• (there is no representation of “weeks” option. If you specify interval in weeks, it’s automatically calculated and stored in “days”).
• Z – contains a single letter to represent if the rescheduling has to be done from start or from completion of the prior run
• S – from the start of the prior run;
• C – from the completion of the prior run.

Some samples:

• 30:N:S – Repeat every 30 minutes from the start of the prior run
• 5:N:C – Repeat every 5 minutes from the completion of the prior run
• 12:H:S – Repeat every 12 hours from the start of the prior run

It’s interesting that information about intervals of periodic schedules is duplicated in fnd_concurrent_requeststable fields RESUBMIT_INTERVAL, RESUBMIT_INTERVAL_TYPE_CODE andRESUBMIT_INTERVAL_UNIT_CODE. I haven’t yet found why’s that so.

“ON SPECIFIC DAY” schedule

In case of on Specific Day schedule fnd_conc_release_classes.CLASS_INFO field contains values like “000010000000000000000000000000010000000” – a 39 character value consisting of 0 and 1. The idea is that the placement of 1-s represent the options selected through form:

• 1-s at places 1 to 31 – represent dates, when request has to be run, eg, if the 10th character is “1” – the request is scheduled to run on 10th day of each month;
• character “1” at the 32nd position – specifies that the request has to be run at the last day of each month;
• 1-s at places 33 to 39 – specifies days of week (Sunday – Saturday)the request has to be run. if the 33rd character is “1” – the request is scheduled to run each Sunday, if 34th – on Monday and so on.

Some samples:

• 000000000000000000000000000000000000001 – Days of week: Sa
• 111111111000000000000000000000000111110 – Dates: 1 2 3 4 5 6 7 8 9. Days of week: Mo Tu We Th Fr
• 000000000000000000000000000000010000000 – Last day of month

Reporting all schedules

Using the information given above I wrote a “small” query to provide a report like this:

Reporting all schedules

The query was tested in Oracle Applications versions 11.5.9, 11.5.10.1, 12.0.1 and 12.0.4 so there’s a good chance it will work on others as well. The performance of the query was OK.  but I have to say – test/analyze it before running in productio.

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 select r.request_id,        p.user_concurrent_program_name || case          when p.user_concurrent_program_name = 'Report Set' then           (select ' - ' || s.user_request_set_name              from fnd_request_sets_tl s             where s.application_id = r.argument1               and s.request_set_id = r.argument2               and language = 'US')          when p.user_concurrent_program_name = 'Check Periodic Alert' then           (select ' - ' || a.alert_name              from alr_alerts a             where a.application_id = r.argument1               and a.alert_id = r.argument2               and language = 'US')        end concurrent_program_name,        case          when p.user_concurrent_program_name != 'Report Set' and               p.user_concurrent_program_name != 'Check Periodic Alert'  then           r.argument_text        end argument_text,        r.requested_start_date next_run,        r.hold_flag on_hold,        decode(c.class_type,               'P',               'Periodic',               'S',               'On Specific Days',               'X',               'Advanced',               c.class_type) schedule_type,        case          when c.class_type = 'P' then           'Repeat every ' ||           substr(c.class_info, 1, instr(c.class_info, ':') - 1) ||           decode(substr(c.class_info, instr(c.class_info, ':', 1, 1) + 1, 1),                  'N',                  ' minutes',                  'M',                  ' months',                  'H',                  ' hours',                  'D',                  ' days') ||           decode(substr(c.class_info, instr(c.class_info, ':', 1, 2) + 1, 1),                  'S',                  ' from the start of the prior run',                  'C',                  ' from the completion of the prior run')          when c.class_type = 'S' then           nvl2(dates.dates, 'Dates: '  || dates.dates || '. ', null) ||           decode(substr(c.class_info, 32, 1), '1', 'Last day of month ') ||           decode(sign(to_number(substr(c.class_info, 33))),                  '1',                  'Days of week: ' ||                  decode(substr(c.class_info, 33, 1), '1', 'Su ') ||                  decode(substr(c.class_info, 34, 1), '1', 'Mo ') ||                  decode(substr(c.class_info, 35, 1), '1', 'Tu ') ||                  decode(substr(c.class_info, 36, 1), '1', 'We ') ||                  decode(substr(c.class_info, 37, 1), '1', 'Th ') ||                  decode(substr(c.class_info, 38, 1), '1', 'Fr ') ||                  decode(substr(c.class_info, 39, 1), '1', 'Sa '))        end schedule,        c.date1 start_date,        c.date2 end_date,        c.class_info   from fnd_concurrent_requests r,        fnd_conc_release_classes c,        fnd_concurrent_programs_tl p,        (SELECT release_class_id,                substr(max(SYS_CONNECT_BY_PATH(s, ' ')), 2) dates           FROM (select release_class_id,                        rank() over(partition by  release_class_id order  by s) a,                        s                   from (select c.class_info,                                l,                                c.release_class_id,                                decode(substr(c.class_info, l, 1),                                       '1',                                       to_char(l)) s                           from (select level  l from  dual connect  by level  <= 31),                                fnd_conc_release_classes c                          where c.class_type = 'S')                  where s is not null)         CONNECT BY PRIOR                     (a || release_class_id) = (a - 1) || release_class_id          START WITH  a = 1          group by release_class_id) dates  where r.phase_code = 'P'    and c.application_id = r.release_class_app_id    and c.release_class_id = r.release_class_id    and nvl(c.date2, sysdate + 1) > sysdate    and c.class_type is not null    and p.concurrent_program_id = r.concurrent_program_id    and p.application_id = r.program_application_id    and p.language = 'US'    and dates.release_class_id(+) = r.release_class_id  order by on_hold, next_run;

I know there are some interesting lines in this query that might need some explanation, but as that is not directly connected to the topic of this post I’ll provide explanation in comments if you will ask for it.

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