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Internals of Concurrent Managers

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1 Internals of Concurrent Managers
UKOUG Conference Series Technology & E-Business Suite 2010 Māris Elsiņš Senior Oracle Applications DBA Tieto Latvia,

2 Who I am? 8 years in IT Certificates Conferences
3 years – PL/SQL developer 5 years – Oracle [Apps] DBA (started with and 8.1.7) Certificates 10g OCM 9i / 10g / 11g OCP 11i Applications Database Administrator OCP 11i System Administrator OCE Conferences UKOUG 2007/2008/2010 LVOUG 2009/2010 EMEA Harmony 2010 Current employer – Tieto Latvia All kinds of oracle DBA tasks - patching, upgrade, performance tuning, troubleshooting, planning and implementation of backup and recovery procedures, cross platform migration, etc Planning of sydtem architecture, design and implementation of HA solutions (RAC, Data Guard, Custom cold failover) Implementation of system specific monitoring, automation of routine tasks Technical project planning and coordination, management of team of DBAs

3 Purpose of this session
Provide background knowledge for successful troubleshooting of concurrent request problems What this presentation is about? Life cycle of a concurrent request Implementation details of the most interesting phases of a life cycle of a concurrent request Internals of Concurrent Managers and Conflict Resolution Managers DB objects that can be used for troubleshooting Why it is important? DBA has to be quick when solving real issues Knowing the process before the problems happen decreases solving time Querying DB objects is faster then navigating through Forms Knowing the process is important when tuning the setup of Concurrent Managers

4 Most interesting DB objects
FND_CONCURRENT_REQUESTS (FCR) FND_CONCURRENT_PROGRAMS (FCP) FND_CONCURRENT_QUEUES (FCQ) FND_CONCURRENT_PROCESSES (FCPROC) FND_CONCURRENT_PROGRAM_SERIAL (FCPS) FND_CONC_RELEASE_CLASSES (FCRC) FND_LOOKUPS (FL) FND_CONCURRENT_WORKER_REQESTS (FCWR) FND_CRM_HISTORY (FCH) FND_CONC_WAITING_REQUESTS Some examples how the tables are used will be uncovered in this presentation

5 Types of concurrent managers
Internal Concurrent Manager Service Manager Concurrent Manager Conflict Resolution Manager Internal Monitor Transaction Manager Scheduler/Prereleaser Manager Today the accent is on

6 Life cycle of a concurrent request
INACTIVE (I) Disabled (U) On Hold (H) No Manager (M) PENDING (P) Normal (I) Standby (Q) Scheduled (P) Waiting (Z) RUNNING (R) Normal (R) Paused (W) Resuming (B) Terminating (T) COMPLETED (C) Normal (C) Error (E) Warning (G) Cancelled (D) Terminated (X) FND_LOOKUPS contains the values of Phase/Status Codes «Oracle® E-Business Suite System Administrator's Guide – Maintenance» describes the meaning of each phase and status

7 Typical life cycle of most requests
Pending / Scheduled Request is scheduled for the execution in future Pending / Standby Time to execute the request has arrived Request waits for to be evaluated by the Conflict Resolution Manager Pending / Normal Request is allowed to be executed Request is waiting to be picked up by Concurrent Manager Running / Running Request is beeing executed by a concurrent manager Completed / Normal

8 Phase/Status representation in tables
FND_CONCURRENT_REQUESTS PHASE_CODE STATUS_CODE Is that so simple? NO! Phase = Inactive practically not used Inactive/Disabled: FCR.PHASE_CODE=‘P’, FCP.ENABLED_FLAG=‘N’ Inactive/On Hold: FCR.PHASE_CODE=‘P’, FCR.HOLD_FLAG=‘Y’ Inactive/No manager: FCR.PHASE_CODE=‘P’ and nonexistance of specific rows in FND_CONCURRENT_WORKER_REQESTS view Pending/Scheduled is actually STATUS_CODE=‘Q’+(FCR.REQUESTED_START_DATE>SYSDATE) Why so complicated? No need to update statuses too often

9 Pending / Scheduled

10 Schedule types As Soon as Possible/Once FCR.REQUESTED_START_DATE
Periodically/On Specific Days FND_CONC_RELEASE_CLASSES (FCRC) Join with FCR on column RELEASE_CLASS_ID FCRC.DATE1 - “Start at” field in the form FCRC.DATE2 - “End at” field in the form FCRC.CLASS_TYPE – «P» for «Periodically», «S» for «On Specific days» FCRC.CLASS_INFO – actual schedule data FCR.REQUESTED_START_DATE always contains the time of next execution, only this field used to determine when the request should be run by the concurrent manager

11 Periodic schedules FCRC.CLASS_INFO contents Values like «X:Y:Z»
X – number of months/weeks/days/hours/minutes the request has to be rescheduled from prior run. Y – time units: “M” – months, “D” – days, “H” – hours, “N” – minutes Z – rescheduling type: «S» – from the start of the prior run, «C» – from the completion of the prior run. 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

12 «On Specific Days» schedules
FCRC.CLASS_INFO contents Values like «XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXYZZZZZZZ» X, Y, Z contains values 0 or 1, representing if the option is selected or not X – digit in each position represent dates 1 – 31 Y – Last Day of month Z – day of week, Su - Sa Samples – Days of week: Sa – Dates: Days of week: Mo Tu We Th Fr – Last day of month

13 Reporting the schedules
Easy to schedule requests, but hard to keep track Check if there are no obsolete schedules that can be removed or tuned Might be few repeting schedules of the same concurrent program can be consolidated into one

14 Pending / Standby

15 Conflict Resolution Manager (CRM)
CRM resolves conflicts in execution of requests enforced by incompatibility rules Simplified CRM workflow Startup – load all incompatibility rules Loaded from FND_CONCURRENT_PROGRAM_SERIAL Stored in memory by FNDCRM (CRM binary executable) Each itereation If FCQ.CONTROL_CODE=‘V’, reload incompatibility rules (?) Lock STATUS_CODE for all Pending/Normal and Pending/Scheduled requests Check each Pending request against the incompatibility rules and verify there are running concurrent managers that can process them (FND_CONCURRENT_WORKER_REQUESTS) «Release» Pending/Standby requests, which don’t break any rules «Return» Pending/Normal requests, which break some rules (?) Record statistics in FND_CRM_HISTORY Sleep for «Sleep Seconods»

16 Interesting DB objects
FND_CONCURRENT_WORKER_REQUESTS View returning mappings of requests and concurrent managers able to execute them Definition of the view contains hardcoded IDs according to the Specialization Rules of Concurrent Managers Rebuilt by «Build Concurrent Request Queue View» request on change of Specilaization rules FND_CRM_HISTORY Good information for tuning and troubleshooting Records statistics for each CRM run, stotistics include: REQUESTS_EXAMINED REQUESTS_STANDBY REQUESTS_RELEASED REQUESTS_RETURNED Can be joined with FCR to find out how many requests were released in each RCM execution iteration FCR.CRM_RELEASE_DATE between FCH.WORK_START AND FCH.WORK_END Purged by «Purge Concurrent Request and/or Manager Data», leaving 1 day of history (R12.1.3)

17 Graphing FND_CRM_HISTORY

18 Why is my request still pending?
Check the status! Pending/Scheduled – time for execution has not come yet Pending/Normal –waiting to be picked up by concurrent manager The request has just been released All concurrent manager processes are busy executing requests Long request execution queue Pending/Standby – Waiting for CRM to be released SELECT WREQID, PHASE, STATUS, WHY FROM FND_CONC_WAITING_REQUESTS WHERE REQID = &REQUEST_ID

19 Pending / Normal

20 Workflow of «Concurrent Managers»

21 Building SQL for querying the requests queue
Select R.Rowid From Fnd_Concurrent_Requests R Where R.Hold_Flag = 'N' And R.Status_Code = 'I' And R.Requested_Start_Date <= Sysdate And (R.Node_Name1 is null or (R.Node_Name1 is not null and FND_DCP.target_node_mgr_chk(R.request_id) = 1)) AND EXISTS (Select Null From Fnd_Concurrent_Programs P Where P.Enabled_Flag = 'Y' And R.Program_Application_Id = P.Application_Id And R.Concurrent_Program_Id = P.Concurrent_Program_Id From Fnd_Oracle_Userid O Where R.Oracle_Id = O.Oracle_Id AND EXISTS (Select Null From Fnd_Conflicts_Domain C Where P.Run_Alone_Flag = C.RunAlone_Flag And R.CD_Id = C.CD_Id)) … … And (P.Execution_Method_Code != 'S' OR (R.PROGRAM_APPLICATION_ID, R.CONCURRENT_PROGRAM_ID) IN ((0, 98), (0, 100), (0, 31721), (0, 31722), (0, 31757))) AND ((R.PROGRAM_APPLICATION_ID, R.CONCURRENT_PROGRAM_ID) NOT IN ((510, 40032), (510, 40033), (510, 42156), (510, 42157), (530, 43793), (530, 43794), (535, 42626), (535, 42627), (535, 42628)) AND ((R.REQUEST_CLASS_APPLICATION_ID IS NULL AND R.CONCURRENT_REQUEST_CLASS_ID IS NULL) OR (R.REQUEST_CLASS_APPLICATION_ID, R.CONCURRENT_REQUEST_CLASS_ID) NOT IN ((0, 2))))) ORDER BY NVL(R.priority, ), R.Priority_Request_ID, R.Request_ID Exclusion specialization rules for concurrent programs Execution order for concurrent requests Implementation of «Immediate» type executables (Subroutines) Exclusion Specialization rule for Request type Distributed Concurrent Processing implementation «Run Alone» flag implementation with Conflict domains Query only «Pending/Normal» requests

22 Building SQL for querying the requests queue
The query is built at the startup of the concurrent manager It hardcodes all specialization rules for the manager Any changes to specialization rules force restart of the concurrent manager processes (and runs «Build Concurrent Request Queue View» concurrent program too) Be careful! It does restart automatically! What happens if there are long running requests? Use «request types»!

23 Locking the STATUS_CODE
SELECT ... FROM fnd_concurrent_requests R, fnd_concurrent_programs P, fnd_application A, fnd_user U, fnd_oracle_userid O, fnd_conflicts_domain C, fnd_concurrent_queues Q, fnd_application A2, fnd_executables E, fnd_conc_request_arguments X WHERE R.Status_code = 'I' And ((R.OPS_INSTANCE is null) or (R.OPS_INSTANCE = -1) or (R.OPS_INSTANCE = decode(:dcp_on, 1, FND_CONC_GLOBAL.OPS_INST_NUM, R.OPS_INSTANCE))) And R.Request_ID = X.Request_ID(+) And R.Program_Application_Id = P.Application_Id(+) And R.Concurrent_Program_Id = P.Concurrent_Program_Id(+) And R.Program_Application_Id = A.Application_Id(+) And P.Executable_Application_Id = E.Application_Id(+) And P.Executable_Id = E.Executable_Id(+) And P.Executable_Application_Id = A2.Application_Id(+) And R.Requested_By = U.User_Id(+) And R.Cd_Id = C.Cd_Id(+) And R.Oracle_Id = O.Oracle_Id(+) And Q.Application_Id = :q_applid And Q.Concurrent_Queue_Id = :queue_id And (P.Enabled_Flag is NULL OR P.Enabled_Flag = 'Y') And R.Hold_Flag = 'N‘ … … And R.Requested_Start_Date <= Sysdate And (R.Enforce_Seriality_Flag = 'N' OR (C.RunAlone_Flag = P.Run_Alone_Flag And (P.Run_Alone_Flag = 'N' OR Not Exists (Select Null From Fnd_Concurrent_Requests Sr Where Sr.Status_Code In ('R', 'T') And Sr.Enforce_Seriality_Flag = 'Y' And Sr.CD_id = C.CD_Id)))) And Q.Running_Processes <= Q.Max_Processes And R.Rowid = :reqname And ((P.Execution_Method_Code != 'S' OR (R.PROGRAM_APPLICATION_ID, R.CONCURRENT_PROGRAM_ID) IN ((0, 98), (0, 100), (0, 31721), (0, 31722), (0, 31757))) AND ((R.PROGRAM_APPLICATION_ID, R.CONCURRENT_PROGRAM_ID) NOT IN ((510, 40032), (510, 40033), (510, 42156), (510, 42157), (530, 43793), (530, 43794), (535, 42626), (535, 42627), (535, 42628)) AND ((R.REQUEST_CLASS_APPLICATION_ID IS NULL AND R.CONCURRENT_REQUEST_CLASS_ID IS NULL) OR (R.REQUEST_CLASS_APPLICATION_ID, R.CONCURRENT_REQUEST_CLASS_ID) NOT IN ((0, 2))))) FOR UPDATE OF R.status_code NoWait

24 Locking the STATUS_CODE
Query for locking the STATUS_CODE reimplements the same validation criteria to make sure situation has not changed All processes of a concurrent manager use the same query to fetch the «cache size» number of requests As more processes of the same manager are run, as higher the competition for requests («ORA-00054: resource busy and acquire with NOWAIT specified», or 0 rows updated by the query if the status has been changed already) As higher the competition, as faster runs out the list of cached request ids for each manager As sooner the list of cached queries runs out, as more often FCR is queried We want to query FCR as saldom as possible Not hard to get to point where FCR queries are TOP SQLs in DB Even more important if you have RAC The key is to minimize the number of concurrent manager processes Cache size and sleep seconds have some effect

25 Cache size and Sleep seconds
sleep time of Conflict Resolution Manager affects how soon the request will be passed to execution are spent only when no requests are in pending/normal status in FCR should be chosen based on max time the request is allowed to spend in the queue Max time 20s and 5 managers? == 100s sleep seconds? «Cache size» Large cache sizes make changes of request priorities less effective (do you use different priorities) Small cache size is OK for Long-running requests queue Larger cache sizes are OK for Short-running requests queues that have few concurrent manager instances. Large cache size increases the number of failed attempts to lock the status code.

26 Running / Normal

27 How to find processes and sessions?
select r.request_id req_id, r.phase_code p, r.status_code s, (select node_name || ':' from applsys.fnd_concurrent_processes cp where concurrent_process_id = r.controlling_manager) || r.os_process_id cp_process, gi.INSTANCE_NAME || ':' || ss.sid || ',' || ss.serial# inst_sid_serial#, gi.HOST_NAME || ':' || pp.spid db_process, ss.program, ss.status, ss.sql_id || ':' || ss.sql_child_number sql_id_chld, ss.event, ss.WAIT_TIME, ss.STATE from applsys.fnd_concurrent_requests r, gv$session ss, gv$process pp, gv$instance gi, applsys.fnd_concurrent_processes cp where request_id = &request_id and ss.audsid(+) = r.oracle_session_id and pp.inst_id(+) = ss.inst_id and pp.addr(+) = ss.paddr and gi.inst_id(+) = ss.inst_id and cp.concurrent_process_id(+) = r.controlling_manager For completed requests CP_PROCESS field is still visible

28 Completed / Normal… …and also the presentation is Completed/Normal 

29 Where to get more information?
OTN - Oracle E-Business Suite System Administrator's Guide Documentation Set – ER Diagrams and information about the DB Objects – Comment and ask the questions, I will answer! Thank you! ?

30 Māris Elsiņš Senior Oracle Applications DBA Tieto Latvia,


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