DB dead lock during update

Hello,
In our R/3 Enterprise 4.7 Production system running on Windows NT/MSSQL, I saw update errors in t-code SM13.
Error details:
Date : 07/19/2009
No. of errors : 24
All errors are for background user BATCH-ID
Function Module : RKE_WRITE_ACT_LINE_ITEM_OP01
Status : DB dead lock during update
SM12 doesnt have any locks currently, not sure about status when these update errors occured.
I didnt find any SAPnotes related to this F-module or similar.
Can you please tell whether it is a serious issue and how to handle such errors?
Regards,
Roshan

Hi,
can u please let us know how many time u have seen this error in SM13. Also from how many days.
If its only once u have seen, then no need to worry.
Function Module : RKE_WRITE_ACT_LINE_ITEM_OP01
Status : DB dead lock during update
From above lines its clear that, Function Module : RKE_WRITE_ACT_LINE_ITEM_OP01 was locked, so the update has failed to access that module. Since it had faield to update, so is the error in sm13 with reason DB dead lock during update.
Can u please refer to the logs in SM21 and also to the trace files(of related work process) related to the same error(red color errors), Try to analyze from there, If u find any difficulties in doing so. Paste the same here along with ur system verion/DB/OS/Patch level
Regards,
Ravi

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20 07 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
20 08 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
20 09 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
20 10 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
20 11 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
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20 16 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
20 17 * * 1-5 home/bin/app_process_prc.sh >> home/bin/app1/process.out
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App_Prc_1
BEGIN
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SELECT col1, col2 … FROM transaction table2 t2 , transaction table t1
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BEGIN
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LOOP
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Variable Size 100666596 bytes
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channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:02:45
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00007 to /opt/oracle/base/oradata/NEW10/test01.dbf
channel ORA_AUX_DISK_1: reading from backup piece /opt/oracle/base/flash_recovery_area/NEW10/backupset/2010_08_17/o1_mf_nnnd0_WEEKLY_66nl9m8k_.bkp
channel ORA_AUX_DISK_1: piece handle=/opt/oracle/base/flash_recovery_area/NEW10/backupset/2010_08_17/o1_mf_nnnd0_WEEKLY_66nl9m8k_.bkp tag=WEEKLY
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:06:55
Finished restore at 17-AUG-10
datafile 1 switched to datafile copy
input datafile copy RECID=6 STAMP=727294911 file name=/opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_system_66o0x1sf_.dbf
datafile 8 switched to datafile copy
input datafile copy RECID=7 STAMP=727294911 file name=/opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_system_66o0x1r9_.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=8 STAMP=727294911 file name=/opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_undotbs1_66o0x1vr_.dbf
datafile 2 switched to datafile copy
input datafile copy RECID=9 STAMP=727294911 file name=/opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_sysaux_66o0x1vj_.dbf
datafile 9 switched to datafile copy
input datafile copy RECID=10 STAMP=727294911 file name=/opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_sysaux_66o0x1rs_.dbf
contents of Memory Script:
# set requested point in time
set until scn 1791053;
# online the datafiles restored or switched
sql clone "alter database datafile 1 online";
sql clone "alter database datafile 8 online";
sql clone "alter database datafile 3 online";
sql clone "alter database datafile 2 online";
sql clone "alter database datafile 9 online";
sql clone "alter database datafile 7 online";
# recover and open resetlogs
recover clone database tablespace "TEST", "SYSTEM", "UNDOTBS1", "SYSAUX" delete archivelog;
alter clone database open resetlogs;
executing Memory Script
executing command: SET until clause
sql statement: alter database datafile 1 online
sql statement: alter database datafile 8 online
sql statement: alter database datafile 3 online
sql statement: alter database datafile 2 online
sql statement: alter database datafile 9 online
sql statement: alter database datafile 7 online
Starting recover at 17-AUG-10
using channel ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: starting incremental datafile backup set restore
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
destination for restore of datafile 00007: /opt/oracle/base/oradata/NEW10/test01.dbf
channel ORA_AUX_DISK_1: reading from backup piece /opt/oracle/base/flash_recovery_area/NEW10/backupset/2010_08_17/o1_mf_nnnd1_DAILY_66nmf6qs_.bkp
channel ORA_AUX_DISK_1: piece handle=/opt/oracle/base/flash_recovery_area/NEW10/backupset/2010_08_17/o1_mf_nnnd1_DAILY_66nmf6qs_.bkp tag=DAILY
channel ORA_AUX_DISK_1: restored backup piece 1
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
starting media recovery
archived log for thread 1 with sequence 39 is already on disk as file /opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_39_66nmc1dg_.arc
archived log for thread 1 with sequence 40 is already on disk as file /opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_40_66nmcfw4_.arc
archived log for thread 1 with sequence 41 is already on disk as file /opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_41_66nmcwcf_.arc
archived log for thread 1 with sequence 42 is already on disk as file /opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_42_66nmddbw_.arc
archived log for thread 1 with sequence 43 is already on disk as file /opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_43_66o0wyys_.arc
archived log file name=/opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_39_66nmc1dg_.arc thread=1 sequence=39
archived log file name=/opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_40_66nmcfw4_.arc thread=1 sequence=40
archived log file name=/opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_41_66nmcwcf_.arc thread=1 sequence=41
archived log file name=/opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_42_66nmddbw_.arc thread=1 sequence=42
archived log file name=/opt/oracle/base/flash_recovery_area/NEW10/archivelog/2010_08_17/o1_mf_1_43_66o0wyys_.arc thread=1 sequence=43
media recovery complete, elapsed time: 00:00:50
Finished recover at 17-AUG-10
database opened
contents of Memory Script:
# make read only the tablespace that will be exported
sql clone 'alter tablespace TEST read only';
# create directory for datapump import
sql "create or replace directory TSPITR_DIROBJ_DPDIR as ''
/opt/oracle/base/flash_recovery_area''";
# create directory for datapump export
sql clone "create or replace directory TSPITR_DIROBJ_DPDIR as ''
/opt/oracle/base/flash_recovery_area''";
executing Memory Script
sql statement: alter tablespace TEST read only
sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/opt/oracle/base/flash_recovery_area''
sql statement: create or replace directory TSPITR_DIROBJ_DPDIR as ''/opt/oracle/base/flash_recovery_area''
Performing export of metadata...
EXPDP> Starting "SYS"."TSPITR_EXP_BkAq":
EXPDP> Processing object type TRANSPORTABLE_EXPORT/PLUGTS_BLK
EXPDP> Processing object type TRANSPORTABLE_EXPORT/TABLE
EXPDP> Processing object type TRANSPORTABLE_EXPORT/GRANT/OWNER_GRANT/OBJECT_GRANT
EXPDP> Processing object type TRANSPORTABLE_EXPORT/INDEX
EXPDP> Processing object type TRANSPORTABLE_EXPORT/CONSTRAINT/CONSTRAINT
EXPDP> Processing object type TRANSPORTABLE_EXPORT/INDEX_STATISTICS
EXPDP> Processing object type TRANSPORTABLE_EXPORT/TRIGGER
EXPDP> Processing object type TRANSPORTABLE_EXPORT/TABLE_STATISTICS
EXPDP> Processing object type TRANSPORTABLE_EXPORT/POST_INSTANCE/PLUGTS_BLK
EXPDP> Master table "SYS"."TSPITR_EXP_BkAq" successfully loaded/unloaded
EXPDP> ******************************************************************************
EXPDP> Dump file set for SYS.TSPITR_EXP_BkAq is:
EXPDP> /opt/oracle/base/flash_recovery_area/tspitr_BkAq_82690.dmp
EXPDP> ******************************************************************************
EXPDP> Datafiles required for transportable tablespace TEST:
EXPDP> /opt/oracle/base/oradata/NEW10/test01.dbf
EXPDP> Job "SYS"."TSPITR_EXP_BkAq" successfully completed at 18:25:02
Export completed
contents of Memory Script:
# shutdown clone before import
shutdown clone immediate
# drop target tablespaces before importing them back
sql 'drop tablespace TEST including contents keep datafiles';
executing Memory Script
database closed
database dismounted
Oracle instance shut down
sql statement: drop tablespace TEST including contents keep datafiles
Removing automatic instance
shutting down automatic instance
target database instance not started
Automatic instance removed
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_temp_66o1k480_.tmp deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/onlinelog/o1_mf_3_66o1k0mg_.log deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/onlinelog/o1_mf_2_66o1jyt4_.log deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/onlinelog/o1_mf_1_66o1jx3w_.log deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_sysaux_66o0x1rs_.dbf deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_sysaux_66o0x1vj_.dbf deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_undotbs1_66o0x1vr_.dbf deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_system_66o0x1r9_.dbf deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/datafile/o1_mf_system_66o0x1sf_.dbf deleted
auxiliary instance file /opt/oracle/base/flash_recovery_area/NEW10/controlfile/o1_mf_66o0wsh8_.ctl deleted
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 08/17/2010 18:25:36
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of sql command on default channel at 08/17/2010 18:25:25
RMAN-11003: failure during parse/execution of SQL statement: drop tablespace TEST including contents keep datafiles
ORA-00604: error occurred at recursive SQL level 1
ORA-00060: deadlock detected while waiting for resource
Recovery Manager complete.
please give your valuable suggestion .It should be more helpful for us.
Edited by: user10750009 on Aug 20, 2010 1:07 AM
Edited by: user10750009 on Aug 20, 2010 1:15 AM

I want TSPITR ,during this operation i faced this deadlock error.
Before that we faced roll backsegment error for that we applied follwing workaround .
If i applied follwing workaround before every backup and restore .i didn't get any error .all things went successful.
spool /tmp/Createtest.log
connect / as sysdba
REM Perform startup in case we are still down
ALTER SYSTEM SET PROCESSES=500 SCOPE=SPFILE;
SHUT IMMEDIATE;
STARTUP MOUNT EXCLUSIVE;
ALTER DATABASE ARCHIVELOG;
ARCHIVE LOG START;
ALTER DATABASE OPEN;
connECT / as sysdba;
alter system set undo_management = MANUAL scope=spfile;
shutdown immediate;
startup;
Connect / as sysdba;
DROP TABLE TEST123;
create table test123 (t1 number, t2 varchar2(10));
begin
for i in 1.. 300000 loop
insert into test values (i,'AAAAAAAAAA');
end loop;
end;
delete test123;
commit;
alter system set undo_management = auto scope=spfile;
shutdown immediate ;
startup ;
The above workaround we applied before creating tablespace and datafile ,after that we face some dead lock error while restore TSPITR .Did you need any more information
Edited by: user10750009 on Aug 20, 2010 1:12 AM

Transaction Locking during multiple Webservice - persistent webs sessions

Hi All, 
 
Yesterday evening we had a discussion concerning ESA architecture. We want to create (web)services for accessing the SAP business objects (using XI) and use these (web)services via visual composer, webdynpro or custom java development. 
 
It does not seem a big problem to perform creations and reads of transaction, but when we want to change objects, we saw some problems concerning locking/commiting and rollbacks. 
 
From our GUI we would like to be able to go in edit mode and from that moment on, the transaction should be locked. We then want to change certain parameters and commit only when we push the save button. 
 
We can invoke a webservice wich tries to lock the transaction, but at the moment the XI scenario is completed (=the lock is created), the program at SAP side (=proxy in our case) is also finished and the lock is automaticly removed. How can we do locking, when using webservices via XI? 
 
The problem of the rollback and commit we can partially solve by putting more logic in the GUI, but we don't want to do that. How can we do a change of a business object and remember this change without doing a commit on the SAP system.... . Same problem for the rollback. 
 
Is there a away to keep a session "alive" during multiple webservice calls or to simulate it? Every webservice invokation happens in a different context...isn't it? 
 
 
Just to make it a bit more clear. 
 
Suppose we create 6 service related to the business object bupa (business partner). 
- read 
- change 
- commit 
- rollback 
- lock 
- unlock. 
 
We create a GUI which uses these services. 
 
Step1: we want to see bupa in detail, so the read webservice is called and the retrieved details are shown in the GUI 
Step2: we want to go in edit mode, so the lock webservice is called to lock the bupa. The bupa should stay locked, untill the unlock is called. Here occurs the problem. The webservice lock is called, XI will trigger the proxy on the SAP system. This proxy will lock the bupa. As soon as the proxy-program is completed, the bupa lock will automaticly be removed ... . We want to keep this lock! 
Step3: we change the bupa using the change webservice. Only the user who locked the bupa should be able to change it. 
Problem concerning the locking occurs: standard we don't know who locked the bupa (this is done by the generic RFC user, configured in sm59). Should we pass some kind of GUID towards the proxy and build some additional logic to know which end-user in fact locked it... . Using the userid isn't sufficient, because a user could logon multiple time simultanously. 
 
Another problem is that we want to change the bupa, without having to do a commit yet.De commit should be called only when pushing the save button. When the proxy is ended and we did not do a commit, the changes are lost normally ... . 
 
What we in fact want to do is Simulate the bsp behaviour. 
Step4:We want to perform a save of the things we changed or a reset. This means the commit or rollback webservice is called. 
Step5: We want to unlock the bupa by calling the unlock webservice. 
 
 
Please give me your comments. 
 
Kind regards 
Joris 
 
Note: Transaction Locking during multiple Webservice "sessions".
Message was edited by:
Joris Verberckmoes

There are multiple strategies how to resolve this. They require that the last change time is available in the changed object, and also that the client keeps the value of the change time when it read the data.
1. First one wins
Immediately before posting the changes, the current change time is read from the server. In case it is different from the client buffer, then the client changes are discarted.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B checks if server change time has changed (result is no)
5. Client B writes his changes to the server
6. Client A changes its buffer
7. Client A checks if server change time has changed (result is yes)
8. Client A discarts its changes
2. Last one wins
Easy. Client just writes his changes to the server, overwriting any changes that might have occured since it read the data.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B writes his changes to the server
5. Client A changes its buffer
6. Client A writes its changes to the server -> changes from client B are lost
3. Everybody wins
Most complicated. In case of concurrent changes, the client is responsible for merging his changes with the changes from other clients and to resolve any conflicts.
Example:
1. Client A reads data
2. Client B reads data
3. Client B changes its buffer
4. Client B checks if server change time has changed (result is no)
5. Client B writes his changes to the server
6. Client A changes its buffer
7. Client A checks if server change time has changed (result is yes)
8. Client A merges its changes with changes from client B
9. Client A writes his changes to the server
"Last one wins" is definitely not water-proof. But even with the other strategies, data can potentially get lost in the short timeframe when the change time is checked and the actual update.
To make it more secure, server support is required. E.g. the client could pass the change time from its read access to the server. The server can then reliably reject the update if the change data has been updated in beetween by another client.

Dead Locks

Gurus,
Please clarify me the three questions which I am posting below
1) What's the deadlock situation ? How oracle treats the dead lock situation
2) Disadvantages of having index
3) I have two tables A and B .. In table A, I have two columns (say col1, col2) .. Col1 is a primary key column .. In table B, I have two columns (say col3, col4) .. Col3 is a primary key column .. Col2 of A has a referrential integrity to Col3 of B ..And Col4 of B has a referrential integrity to col2 of A .. Now if I am inserting a values in table A ...it is showing error "parent value doesnt exist" .. like wise, if I am inserting values in table B, the above mentioned error is comming ..
How to overcome this error
Please advice
Regards

Hi.
1) A dead lock is a situation where two or more sessions acquire locks which then prevent each other from moving on. ie session one updates a row aaa in a table and session two updates row bbb (no commits). Session one then attempts to update row bbb and session two attempts to update row aaa and both wait for the locks to clear (default behaviour). Oracle monitors for these situations and will automatically kill one of the sessions and allow the other to complete.
2) Indexes are used to speed up access to data in the database and if associated with a Primary or Unique Key, enforce uniqueness. They have the disadvantages of taking up space and slowing down updates and inserts.
3) This is not a deadlock. It is a circular reference. You cannot insert into one table because the other table is expected to have a parent value and vice versa. From a data modelling point of view a circular reference is unsupportable and meaningless. Like trying to be your father's son and your father's father at the same time.
Regards
Andre

DB dead lock during update

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