Implications of Changing WebDynpro Parameter: sap.locking.maxWaitInterval

SAP [OSS note 1234847|https://service.sap.com/sap/support/notes/1234847] mentions changing the WebDynpro parameter sap.locking.maxWaitInterval
What are the implications of setting this to 30 minutes or 1 hour?

Hi Juan,
Yes the value is in seconds. I raised the question with SAP OSS and they replied with a good answer:
As the note 1234847 explains,s soon as a request for a user session is processed, the user session is blocked for the duration of the request i.e. there is always at most one thread that has acquired the lock of a user session.
Concurrent requests which refer to the same user session (i.e. triggeredfrom the same browser process) are serialized and processed one after each other. If there is a request which blocks or hangs due to some waiting/blocking condition, then other concurrently incoming requests are waiting for a certain period of time that the user session lock is released. If they can't acquire the user session lock after this time interval, the waiting thread terminates with a LockException error page.
In such cases, the "sap.locking.maxWaitInterval" is helpful. Depending on the requests, administrators can increase it.
In previous cases, we have had customers increase it from 100s to 300s (or 500s) in the Web Dynpro default.properties, depending on their need.This will not make the server processing time slow, but there will be anextra buffer time so that the user request can pass through.
Customers vary the values of the parameter depending on the long runningapplications.
More information is available: http://help.sap.com/saphelp_nwce71/helpdata/en/43/8a1a8ece230c8ce10000000a11466f/content.htm
SAP note 1113811 also provides some info..
However, if even after increasing this parameter, if there are locking issues, then this can be due to a application error. We will
need to anayse a thread dump to check the status of the threads during the locking process. As you are aware, it is the java threads that are responsible for the actual carrying out of the server tasks, akin to the ABAP work processes.
SAP Note No. 710154-How to create a thread dump for the J2EE Engine

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hi,
    what is difference between sap locking and database locking. Iam locked the table mara by using lock objects.
But iam unable to unlock the mara table. I give u the coding. Please check it.
REPORT zlock .
CALL FUNCTION 'ENQUEUE_EZTEST3'
EXPORTING
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Hi Paluri
Here is the difference between SAP locks and Database locks, i will try to find the solution to your code.
Regards
Ashish
Database Locks: The database system automatically sets database locks when it receives change statements (INSERT, UPDATE, MODIFY, DELETE) from a program. Database locks are physical locks on the database entries affected by these statements. You can only set a lock for an existing database entry, since the lock mechanism uses a lock flag in the entry. These flags are automatically deleted in each database commit. This means that database locks can never be set for longer than a single database LUW; in other words, a single dialog step in an R/3 application program.
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SAP Locks:
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Hi All,
should the sap locks ENQUEUE/DEQUEUE need to be used for all the updation/insertion of records ino the table?
Please confirm.Should this locking technique be used even for insertion of records into the table?
Regards,
Pra.

Hi,
Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
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works like a write lock except that the enhanced write lock also protects from further accesses from the
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Use: you can see in almost all transaction when you are open an object in Change mode SAP could not allow to any other user to open the same object in change mode.
Example: in HR when we are enter a personal number in master data maintainance screen SAP can't allow to any other user to use same personal number for changes.
Technicaly:
When you create a lock object System automatically creat two function module.
1. ENQUEUE_<Lockobject name>. to insert the object in a queue.
2. DEQUEUE_<Lockobject name>. To remove the object is being queued through above FM.
You have to use these function module in your program.
Hope this will give a basic idea.

Query about SAP locks /enqueue objects

I have created an lock object for a bespoke table which has 5 key fields. For arguments sake let's call them
WERKS QMGRP QMCOD OTGRP OTEIL.
The problem I have is the following:
User 1 has a house profile that can access the following data:
WERKS QMGRP QMCOD OTGRP OTEIL
9026 HOUSE CUST
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Hope this makes sense
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Hi Larissa,
As far as I know, You cannot change generated enqueue function module. The other way as i think might work would be to create a new FM and do manipulation (for space to be changed as some other value) before calling this generated Enqueue FM.
Hope this helps.
Regards,
Vicky
PS: Award points if helpful

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Can we change log_buffer parameter online e.g. when all users are working.. ???
What is relation between redo buffer in sga and log_buffer parameter ?
SQL> show sga
Total System Global Area 3758096384 bytes
Fixed Size 1983152 bytes
Variable Size 553655632 bytes
Database Buffers 3187671040 bytes
Redo Buffers 14786560 bytes
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NAME TYPE VALUE
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SQL>
SQL>
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I am hoping your Oracle Consultant know what he's talking about.
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5:21:36.691 [11248] <4> adjustObjectStatus: File </oracle/BP1/oraarch/BP1arch1_207989.dbf> in VxBSA_INPROGRESS status. No ch
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Cheers
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Implications of Changing WebDynpro Parameter: sap.locking.maxWaitInterval

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