Questions regarding Lock Objects.

I am creating a custom table and I want to implement a unique ID for my table and I want to use the technique of auto-increment. I created a seperate table where to store the increments to be used as IDs. So basically, when a new data is going to be saved on my other table, the program will query the next "id" from the table for increments. I have to make sure that the updating and reading of the data from the table is accessed one at a time to rule out the possibility that there will be no duplicate IDs generated.
I have read about shared locks and exclusive locks which would serve as a solution for my purpose. The question is: is it possible for other users to "read" from a table if it is currently in an "exclusive lock" by another user?

>
it2051229 wrote:
> I am creating a custom table and I want to implement a unique ID for my table and I want to use the technique of auto-increment. I created a seperate table where to store the increments to be used as IDs. So basically, when a new data is going to be saved on my other table, the program will query the next "id" from the table for increments. I have to make sure that the updating and reading of the data from the table is accessed one at a time to rule out the possibility that there will be no duplicate IDs generated.
>
> I have read about shared locks and exclusive locks which would serve as a solution for my purpose. The question is: is it possible for other users to "read" from a table if it is currently in an "exclusive lock" by another user?
No it isn't.
When you've selected your current value with SELECT FOR UPDATE (to get the exclusive lock) then every other reader will have to wait.
But is this really what you want?
Putting locks on something like an increasing number that is just used for an internal ID?
This will do nothing but turn your multiuser database application into a one-by-one slowness.
Instead, check the documentation about SEQUENCES.
These database objects were made for this. Lockfree increasing (or decreasing) numbers for unique ID columns.
Easy to use. Safe to use.
In 99.9% of all cases this is what you should use.
regards,
Lars

Similar Messages

Regarding Lock objects concept

Hi,
 I am interested in knowing what is the significance of Lock objects in SAP.
 Can we co-relate SAP lock objects with Oracle.
 Frnds, I dont need any material i hav enough but i want to know the cocept behind this.
Thanking u all.
regards,
suraj

Hi,
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.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
GO TO SE11
Select the radio button "Lock object"..
Give the name starts with EZ or EY..
Example: EYTEST
Press Create button..
Give the short description..
Example: Lock object for table ZTABLE..
In the tables tab..Give the table name..
Example: ZTABLE
Save and generate..
Your lock object is now created..You can see the LOCK MODULES..
In the menu ..GOTO -> LOCK MODULES..There you can see the ENQUEUE and DEQUEUE function
Lock objects:
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
Match Code Objects:
http://help.sap.com/saphelp_nw2004s/helpdata/en/41/f6b237fec48c67e10000009b38f8cf/content.htm
http://searchsap.techtarget.com/tip/0,289483,sid21_gci553386,00.html
See this link:
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
Check these links -
lock objects
Lock Objects
Lock Objects
Regards,
Priyanka.

Regarding Lock Object

Hi Experts,
Can you please guide me how i can find out the lock object name. If i know the table name. is there any table which stores the table name and lock object name for that table.
Or any function module to which i can pass table name in return i can get lock object name.
i have to do all this by coding.
Its very urgect.
Thanks in advance.
AZAD:)

Hi
Lock Objects Tables is: DD25L
Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
SAP Provide three type of Lock objects.
- Read Lock(Shared Locked)
protects read access to an object. The read lock allows other transactions read access but not write access to
the locked area of the table
- Write Lock(exclusive lock)
protects write access to an object. The write lock allows other transactions neither read nor write access to
the locked area of the table.
- Enhanced write lock (exclusive lock without cumulating)
works like a write lock except that the enhanced write lock also protects from further accesses from the
same transaction.
You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.
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.
check this link for example.
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
tables:vbak.
call function 'ENQUEUE_EZLOCK3'
exporting
mode_vbak = 'E'
mandt = sy-mandt
vbeln = vbak-vbeln
X_VBELN = ' '
_SCOPE = '2'
_WAIT = ' '
_COLLECT = ' '
EXCEPTIONS
FOREIGN_LOCK = 1
SYSTEM_FAILURE = 2
OTHERS = 3
if sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
endif.
Reward points if useful
Regards
Anji
Message was edited by:
Anji Reddy Vangala

Regarding lock objects

Hi,
How can we know that lock objects has been created for table or particular records..
Naveen M.

Hi Naveen Kumar,
Lock Objects usually begin with the letter 'E' -
> For Eg. EZLOCK
When a lock is created or released it does with the help of some function module.
Usually when the Lock object is created, a Funtion Module is automatically created which starts with ENQUEUE
when the Lock object is realeased, a Funtion Module is created which starts with DEQUEUE.
For eg. Create a lock object EZLOCK on some ZJK_EKKO table.
Once its activated, go to se37 and check for function module ENQUEUE_EZLOCK.
Once v delete this lock object the function module ENQUEUE_EZLOCK is also deleted .
To Go se84-->ABAP Dictionary > Lock Objects> Give the lock object name.
usually the lock object wil have the table name in it.
So if its MARA Table , Search MARA in Lock object name and it ll list out the
Lock objects and its tables.
Edited by: Jk on Jul 7, 2009 8:43 AM

Lock Object. Want to see if it's locked.

Hello to everyone.
I have got a question about lock objects.
There is a Z-table in abap dictionary. During the processing of my report some strings from this Z-table are selected. To select strings i use the SELECT statement. But there can appear the situation when two users ( or more) run my transaction, so the same strings can be selected and then processed. To avoid this situation i've created the lock object with cumulative lock mode ( 'X' ) for this Z-table and put the calling of ENQUEUE function into the code. To test the locking i' ve run my report under two different accounts in the debugging mode. And found that when the enqueue function is finished , and the current string should be locked in theory, this string can be easily selected with help of select-statement under another account. (Even when the transactions start with delay.)
How can i lock the string in the Z-table so that it could be selected only once during the earlier launched transaction?
Regards,
alex karpo.

Ho alex,
SAP locking is a cooperative locking model. That means that you have to care for what is possible and what is not possible. You may use enqeue module to set lock for key of every object selected.
If there is already a foreign lock, you should delete the entry from the list or table of selected objects (in memory, not in database).
Or do it as SAP does: If there is a foreign lock, the user is informed and the data can be displayed, not changed.
You can always check the lock by trying to set a lock.
Regards,
Clemens

Questions regarding Optimizing formulas in IP

Dear all,
This weekend I had a look at the webinar on Tips and Tricks for Implementing and Optimizing Formulas in IP.
Im currently working on an IP-implementation and encounter the following when getting more in-depth.
Id appreciate very much if you could comment on the questions below.
1.) I have a question regarding optimization 3 (slide 43) about Conditions:
If the condition is equal to the filter restriction, then the condition can be removed.
I agree fully on this, but have a question on using the Planning Function (PF) in combination with a query as DataProvider.
In my query I have a filter in the Characteristic restriction.
It contains variables on fiscal year, version. These only allow single value entry.
The DataProvider acts as filter for my PF. So Id suppose I dont need a condition for my PF since it is narrowed down on fiscal year and version by my query.
a.) Question: Is that correct?
I just one to make sure that I dont get to many records for my PF as input. How detrimental for performance is it to use conditions anyway?
2.) I read in training BW370 (IP-training) that a PF is executed for the currently set filter (navigational state) in the query and that characteristics that are used in restricted keyfigures are ignored in the filter.
So, if I use version in the restr. keyfig it will be ignored.
Questions:
a.) Does this mean that the PF is executed for all versions in the system or for the versions that are in the filter of the Characteristic Restrictions and not the currently set filter?
b.) Id suppose the dataset for the PF can never be bigger than the initial dataset that is selected by the query, right?
c.) Is the PF executed anaway against navigational state when I use filtering? If have an example where I filter on field customer thus making my dataset smaller, but executing the PF still takes the same amount of time.
d.) And I also encounter that the PF is executed twice. A popup comes up showing messages regarding the execution. After pressing OK, it seems the PF runs again...
3.) If I use variables in my Planning Function I dont want to fill in the parameter VAR_VALUE with a value. I want to use the variable which is ready for input from the selection screen of the query.
So when I run the PF it should use the BI-variable. Its no problem to customize this in the Modeler. But when I go into the frontend the field VAR_VALUE stays empty and needs a value.
Question:
a.) What do I enter here? For parameter VAR_NAME I use the variable name, but what do I use for parameter VAR_VALUE? Also the variable name?
4.) Question regarding optimization 6 (slide 48) about Formulas on MultiProviders:
'If the formula is using data of only one InfoProvider but is defined on a MultiProvider, the the complete formual should be moved to the single base InfoProvider'.
In our case we have three cubes in the MP, two realtime and one normal one. Right now we have one AggrLevel (AL) on op of the MP.
For one formula I can use one cube so it's better to cretae another AL with the formula based on that cube.
For another formula I need the two realtime cubes. This is interesting regarding the optimization statement.
Question:
a.) Can I use the AL on the MP then or is it better to create a new MP with only these two cubes and create an AL on top of that. And than create the formula on the AL based on the MP with the two cubes?
This makes the architecture more complex.
Thanks a lot in advance for your appreciated answers!
Kind regards, Harjan


Marc,
Some additional questions regarding locking.
I encounter that the dataset that is locked depends on the restrictions made in the 'Characteristic Restrictions'-part of the query.
Restrictions in the 'Default Values'-part are not taken into account. In that case all data records of the characteristic are locked.
Q1: Is that correct?
To give an example: Assume you restrict customer on hierarchy node in Default Values. If you want people to plan concurrently this is not possible since all customers are locked then. When customer restriction is moved to Char Restr the system only locks the specific cutomer hier node and people can plan concurrently.
Q2: What about variables use in restricted keyfigures like variable for fy/period? Is only this fy/period locked then?
Q3: We'd like to lock on a navigational attribute. The nav attr is put as a variable in the filter of the Characteristic Restrictions. Does the system then only lock this selection for the nav.attr? Or do I have to change my locking settings in RSPLSE?
Then question regarding locking of data for functions:
Assume you use the BEx Analyzer and use the query as data_provider_filter for your planning function. You use restricted keyfigures with char Version. First column contains amount for version 1 and second column contains amount for version 2.
In the Char Restrictions you've restricted version to values '1' and '2'.
When executing the inputready query version 1 and 2 are locked. (due to the selection in Char Restr)
But when executing the planning function all versions are locked (*)
Q4: True?
Kind regards, Harjan

Questions regarding new functionalities in EhP 4 - Reporting Financials 2

Dear Forum,
in a project we would like to use some new functionalities from Reporting Financials 2 - ie. Datasource 0FI_AA_20 for Depreciation and Amortization loading to BI for following years as this can not be done by old extractor.
We are know looking for reliable information about impact and changes that are made in ERP if we switch on the functionality Reporting Financials 2 via SFW5? Will old extracors work nevertheless? Will all reports in ERP work without problems? Is there any impact on business processes? Or is this just additional functionality which will not affect current implementation?
Can anybody give information about this?
Thanks, regards
Lars
Edited by: Lars Hermanns on Jun 2, 2010 10:29 AM
Edited by: Lars Hermanns on Jun 2, 2010 10:29 AM

Marc,
Some additional questions regarding locking.
I encounter that the dataset that is locked depends on the restrictions made in the 'Characteristic Restrictions'-part of the query.
Restrictions in the 'Default Values'-part are not taken into account. In that case all data records of the characteristic are locked.
Q1: Is that correct?
To give an example: Assume you restrict customer on hierarchy node in Default Values. If you want people to plan concurrently this is not possible since all customers are locked then. When customer restriction is moved to Char Restr the system only locks the specific cutomer hier node and people can plan concurrently.
Q2: What about variables use in restricted keyfigures like variable for fy/period? Is only this fy/period locked then?
Q3: We'd like to lock on a navigational attribute. The nav attr is put as a variable in the filter of the Characteristic Restrictions. Does the system then only lock this selection for the nav.attr? Or do I have to change my locking settings in RSPLSE?
Then question regarding locking of data for functions:
Assume you use the BEx Analyzer and use the query as data_provider_filter for your planning function. You use restricted keyfigures with char Version. First column contains amount for version 1 and second column contains amount for version 2.
In the Char Restrictions you've restricted version to values '1' and '2'.
When executing the inputready query version 1 and 2 are locked. (due to the selection in Char Restr)
But when executing the planning function all versions are locked (*)
Q4: True?
Kind regards, Harjan

With regard to lock object and authority check

hi all
i would like to know about lock object and authority check specifically in reports. there is a coding in sap library with regard to authority check, but there is no coding to restrict user (i mean there is no user names that the object is restricting for a particular user or any user has got permission to change or display object).
further, the code mentions that you need an authorization in your user master record for the object, could any of u explain where is user master record.
below is the code for authority check.
*& Module USER_COMMAND_0100 INPUT
MODULE USER_COMMAND_0100 INPUT.
CASE OK_CODE.
 WHEN 'SHOW'.
 AUTHORITY-CHECK OBJECT 'S_CARRID'
ID 'CARRID' FIELD '*'
ID 'ACTVT' FIELD '03'.
 IF SY-SUBRC NE 0. MESSAGE E009. ENDIF.
 MODE = CON_SHOW.
 SELECT SINGLE * FROM SPFLI
 WHERE CARRID = SPFLI-CARRID
 AND CONNID = SPFLI-CONNID.
 IF SY-SUBRC NE 0.
MESSAGE E005 WITH SPFLI-CARRID SPFLI-CONNID.
 ENDIF.
 CLEAR OK_CODE.
 SET SCREEN 200.
 WHEN 'CHNG'.
 AUTHORITY-CHECK OBJECT 'S_CARRID'
ID 'CARRID' FIELD '*'
ID 'ACTVT' FIELD '02'.
 IF SY-SUBRC NE 0. MESSAGE E010. ENDIF.
 MODE = CON_CHANGE.
 SELECT SINGLE * FROM SPFLI
 WHERE CARRID = SPFLI-CARRID
 AND CONNID = SPFLI-CONNID.
 IF SY-SUBRC NE 0.
 MESSAGE E005 WITH SPFLI-CARRID SPFLI-CONNID.
 ENDIF.
 OLD_SPFLI = SPFLI.
 CLEAR OK_CODE.
 SET SCREEN 200.
ENDCASE.
ENDMODULE. " USER_COMMAND_0100 INPUT
i thank u all for the help in advance.

hi
this might help
REPORT YUSRLOCK NO STANDARD PAGE HEADING.
TABLES: TRDIR, USR02.
DATA: MARK,CNTR TYPE I,
 ACCNT LIKE USR02-ACCNT, ERDAT LIKE USR02-ERDAT,
 ANAME LIKE USR02-ANAME, CLI(3) VALUE 'AAA', SZIN TYPE I,
 SYDATUM LIKE SY-DATUM, FLAG(3).
TABLES: UINFO.
DATA: OPCODE TYPE X VALUE 2.
DATA: BEGIN OF USR_TABL OCCURS 10.
 INCLUDE STRUCTURE UINFO.
DATA: END OF USR_TABL.
START-OF-SELECTION.
CALL 'ThUsrInfo' ID 'OPCODE' FIELD OPCODE
 ID 'TAB' FIELD USR_TABL-SYS.
SELECT * FROM USR02 CLIENT SPECIFIED ORDER BY MANDT BNAME.
 IF USR02-MANDT <> CLI.
 SZIN = SZIN + 1. SZIN = SZIN MOD 2.
 CLI = USR02-MANDT.
 ENDIF.
 IF USR02-UFLAG = 0.
 MARK = ' '.
 ELSE.
 MARK = 'X'.
 ENDIF.
 CLEAR FLAG.
 LOOP AT USR_TABL.
 IF USR_TABL-BNAME = USR02-BNAME AND USR_TABL-MANDT = USR02-MANDT.
 FLAG = '!!!'.
 ENDIF.
 ENDLOOP.
 SYDATUM = SY-DATUM - 30.
 IF SYDATUM < USR02-TRDAT.
 IF SZIN = 0.
 WRITE:/ ' ', MARK AS CHECKBOX,' ', USR02-BNAME COLOR 2,
 ' ',USR02-MANDT COLOR 2,
 ' ',USR02-USTYP COLOR 2,
 ' ',USR02-TRDAT COLOR 2, USR02-LTIME COLOR 2,
 ' ',FLAG COLOR 6.
 ELSE.
 WRITE:/ ' ', MARK AS CHECKBOX,' ', USR02-BNAME COLOR 3,
 ' ',USR02-MANDT COLOR 2,
 ' ',USR02-USTYP COLOR 2,
 ' ',USR02-TRDAT COLOR 2, USR02-LTIME COLOR 2,
 ' ',FLAG COLOR 6.
 ENDIF.
 ELSE.
 IF SZIN = 0.
 WRITE:/ ' ', MARK AS CHECKBOX,' ', USR02-BNAME COLOR 2,
 ' ',USR02-MANDT COLOR 2,
 ' ',USR02-USTYP COLOR 2,
 ' ',USR02-TRDAT COLOR 4, USR02-LTIME COLOR 4,
 ' ',FLAG COLOR 6.
 ELSE.
 WRITE:/ ' ', MARK AS CHECKBOX,' ', USR02-BNAME COLOR 3,
 ' ',USR02-MANDT COLOR 2,
 ' ',USR02-USTYP COLOR 2,
 ' ',USR02-TRDAT COLOR 4, USR02-LTIME COLOR 4,
 ' ',FLAG COLOR 6.
 ENDIF.
 ENDIF.
 HIDE: USR02-BNAME, USR02-MANDT.
ENDSELECT.
CLEAR USR02.
TOP-OF-PAGE.
WRITE:/ 'LOCK USER CLIENT TYPE LAST lOGIN ' COLOR 6.
SKIP.
AT USER-COMMAND.
IF SY-UCOMM = 'SEL'.
 DO.
 CLEAR MARK.
 READ LINE SY-INDEX FIELD VALUE MARK.
 IF SY-SUBRC NE 0. EXIT. ENDIF.
 IF USR02-BNAME IS INITIAL.CONTINUE.ENDIF.
 SELECT SINGLE * FROM USR02 CLIENT SPECIFIED WHERE
 MANDT = USR02-MANDT AND BNAME = USR02-BNAME.
 IF MARK = 'X' AND USR02-UFLAG = 0.
 USR02-UFLAG = 64.
 UPDATE USR02 CLIENT SPECIFIED SET: UFLAG = 64 WHERE
 MANDT = USR02-MANDT AND
 BNAME = USR02-BNAME.
 COMMIT WORK.
 ENDIF.
 IF MARK = ' ' AND USR02-UFLAG = 64.
 USR02-UFLAG = 0.
 UPDATE USR02 CLIENT SPECIFIED SET: UFLAG = 0 WHERE
 MANDT = USR02-MANDT AND
 BNAME = USR02-BNAME.
 COMMIT WORK.
 ENDIF.
 ENDDO.
 CLEAR USR02.
ENDIF.
regards
Arun

Custom Lock objects few question issues

Hello guys , i create a custom lock object for my z tables ( ZFISGC_MCFG ) which have 3 key field
MANDT
ID_EMPRESA
CL_MVTOSGC
now in my program doing testing i put a break point after the ENQUEUE_ of the lock object
then when i go to the sm30 and try modif the value of the entry using the same key i pass to the ENQUEUE_ fm i can modif and save the entry now i am now if that is the right workflow in custom object lock or if i am doing something wrong , this is how i can the enqueue FM:
call function 'ENQUEUE_EZFISGCOBJECT'
EXPORTING
 MODE_ZFISGC_MCFG = 'E'
 MANDT = SY-MANDT
 ID_EMPRESA = p_bukrs
* X_ID_EMPRESA = ' '
* _SCOPE = '2'
* _WAIT = ' '
* _COLLECT = ' '
EXCEPTIONS
 FOREIGN_LOCK = 1
 SYSTEM_FAILURE = 2
 OTHERS = 3
if sy-subrc <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
* WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
endif.
Thanks

You have to remember that SAP locks are logical locks, not physical. This means that whatever you enqueue is not physically locked from changes. You have to ensure that any program that tries to update your table, first checks these locks and stops the update if it finds that it is already locked.
Rob

Report to find Locked objects in sap system

Hi All,
does anyone know the report to find out the locked objects in an sap system?
or
name of the table that stores locked objects ?
or any other way through which we can find the number of locked objects ?
Thanks and regards
Abdul Hadi

Hi,
You can unlock locked objects in transaction SE03.
Click on Display Repaired objects.
You can see all the objects that are locked.
To unlock you can select the particular object and click on Unlock.
Do reward points if the answer to your question is met.
Regards
Suhas

Lock Object Confusion

Hello All ,
I have create one Module Pool program.it is having three t code for creation ,change and display. it is having two table Header and details table.
I have decided to go for shared lock as per requirement. That's why created on lock object with the help of t code se11 .
My problem is how do I call that lock object in program, because all the lock object are called using called function PATTERN. When I am also trying to do the same it give me message function not found.
Can some one tell me :
1 . How do I called lock object in my program.
2. Lock object : lock parameter are there ,Means the primery key of lock object on the logic of this the lock object is called.
3. would the same lock I can called for Create and change also. Would i work ?. At the same time other operation can perform.
Please provide me the ansower of the question.
regards
Swati namdeo

Hi
Hope it will help you.
Pls reward if help.
Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
SAP Provide three type of Lock objects.
- Read Lock(Shared Locked)
protects read access to an object. The read lock allows other transactions read access but not write access to
the locked area of the table
- Write Lock(exclusive lock)
protects write access to an object. The write lock allows other transactions neither read nor write access to
the locked area of the table.
- Enhanced write lock (exclusive lock without cumulating)
works like a write lock except that the enhanced write lock also protects from further accesses from the
same transaction.
You can create a lock on a object of SAP thorugh transaction SE11 and enter any meaningful name start with EZ Example EZTEST_LOCK.
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.
check this link for example.
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
tables:vbak.
call function 'ENQUEUE_EZLOCK3'
exporting
mode_vbak = 'E'
mandt = sy-mandt
vbeln = vbak-vbeln
X_VBELN = ' '
_SCOPE = '2'
_WAIT = ' '
_COLLECT = ' '
EXCEPTIONS
FOREIGN_LOCK = 1
SYSTEM_FAILURE = 2
OTHERS = 3
if sy-subrc <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
endif.
Normally ABAPers will create the Lock objects, because we know when to lock and how to lock and where to lock the Object then after completing our updations we unlock the Objects in the Tables
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
purpose: If multiple user try to access a database object, inconsistency may occer. To avoid that inconsistency and to let multiple user give the accessibility of the database objects the locking mechanism is used.
Steps: first we create a loc object in se11 . Suppose for a table mara. It will create two functional module.:
1. enque_lockobject
1. deque_lockobject
before updating any table first we lock the table by calling enque_lockobject fm and then after updating we release the lock by deque_lockobject.
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
GO TO SE11
Select the radio button "Lock object"..
Give the name starts with EZ or EY..
Example: EYTEST
Press Create button..
Give the short description..
Example: Lock object for table ZTABLE..
In the tables tab..Give the table name..
Example: ZTABLE
Save and generate..
Your lock object is now created..You can see the LOCK MODULES..
In the menu ..GOTO -> LOCK MODULES..There you can see the ENQUEUE and DEQUEUE function
Lock objects:
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
Match Code Objects:
http://help.sap.com/saphelp_nw2004s/helpdata/en/41/f6b237fec48c67e10000009b38f8cf/content.htm
http://searchsap.techtarget.com/tip/0,289483,sid21_gci553386,00.html
See this link:
http://www.sap-img.com/abap/type-and-uses-of-lock-objects-in-sap.htm
Check these links -
lock objects
Lock Objects
Lock Objects

Lock object vith forgien key

HI All,
I have 4 table that are related via forgin key ,i want to create lock object and my question
is if i need to create lock object for each table or just one lock object.
Best Regards
Joy

its simple dear,
the number of table you are updating in one go will form the tables in locking objects
for example in save command you are updating 3 table then you will lock three table
and just readting from master table then you will create a seperate lock for your master table ..
i.e you will put a read lock on your master table and write lock on your child table..
just put read lock on master first if successfull. the place the write lock on the child.
Regards

Using lock object

HI ,
I have tables which are updated from FM .
the table have user context .
my question is if i need to use lock object if i dont create maintenance view for the tables ?
Or in other words when to use it and when not ?
Regards
JOy
Edited by: Joy Stpr on Oct 18, 2009 8:29 AM

Hi Joy,
Well to be specific I had used Locking the object in HR module, so i would like to explain based on that.
HR modules have many views in a transaction...and they display data from tables.
now when we change data...at times it is necessary that the data must not be changed at all.
in such scenarios, we lock the object, means no changes can be done.
as 1 friend has rightly mentioned abt enqueue function.
actually theres a function module for enqueue...when u need to make any changes to the data...
u shud 1st enqueue that particular record, so that no one else can edit it, or work on it....after making necessary changes, u then dequeue it...so that it becomes accessible for editing.
so, basically locks, as name suggest can be used to prevent editing.
either temporarily till u r making changes to it....or for a long time...
but the locks can also be removed by coding...
Hope this information helps u
Regards,
Radhika

FM to lock objects (BP)

Hello all,
Since the CRM development page is not working at the moment I post this question here.
I need to know if there is any FM that verifies if a Business Partner (object) is locked by a user.
Can you guys please help me with this? Thank you!
Felipe

Hi Felipe!
Easiest way to find the function module:
Lock a business partner (enter in change transaction), go to transaction SM12, identify corresponding line, double click.
There is a field lock object name.
Name of FM is 'ENQUEUE_'+<lock object>.
Try to set a lock with this FM.
If it's possible, then there was no lock, release lock again with 'DEQUEUE_'+<lock_object>.
If it's not possible, then there is already a foreign lock (or a wrong function call...).
Regards,
Christian

Questions regarding customisation/configuration of PS CS4

Hello
I have accumulated a list of questions regarding customising certain things in Photoshop. I don't know if these things are doable and if so, how.
Can I make it so that the list of blending options for a layer is by default collapsed when you first apply any options?
Can I make it possible to move the canvas even though I'm not zoomed in enough to only have parts of it visible on my screen?
Is it possible to enable a canvas rotate shortcut, similar to the way you can Alt+RightClick to quickly change brush size?
Is it possible to lock button positions? Sometimes I accidentally drag them around when I meant to click.
Is it possible to lock panel sizes? For example, if I have the Navigator and the Layers panels vertically in the same group, can I lock the height of the navigator so that I don't have to re-adjust it all the time? Many panels have a minimum height so I guess what I am asking for is if it's possible to set a maximum height as well.
Is it possible to disable Photoshop from automatically appending "copy" at the end of layer/folder names when I duplicate them?
These are things I'd really like to change to my liking as they are problems I run into on a daily basis.
I hope someone can provide some nice solutions

NyanPrime wrote:
<answered above>
Can I make it possible to move the canvas even though I'm not zoomed in enough to only have parts of it visible on my screen?
Is it possible to enable a canvas rotate shortcut, similar to the way you can Alt+RightClick to quickly change brush size?
Is it possible to lock button positions? Sometimes I accidentally drag them around when I meant to click.
Is it possible to lock panel sizes? For example, if I have the Navigator and the Layers panels vertically in the same group, can I lock the height of the navigator so that I don't have to re-adjust it all the time? Many panels have a minimum height so I guess what I am asking for is if it's possible to set a maximum height as well.
Is it possible to disable Photoshop from automatically appending "copy" at the end of layer/folder names when I duplicate them?
These are things I'd really like to change to my liking as they are problems I run into on a daily basis.
I hope someone can provide some nice solutions
2. No. It's a sore spot that got some forum time when Photoshop CS4 was first released, then again with CS5. It's said that the rules change slightly when using full-screen mode, though I personally haven't tried it.
3. Not sure, since I haven't tried it. However, you may want to explore the Edit - Keyboard Shortcuts... menu, if you haven't already.
4. What buttons are you talking about? Those you are creating in your document? If so, choose the layer you want to lock in the LAYERS panel, then look at the little buttons just above the listing of the layers:
5. There are many, many options for positioning and sizing panels. Most start with making a panel visible, then dragging it somewhere by its little tab. One of the important features is that you can save your preferred layout as a named workspace. Choose the Window - Workspace - New Workspace... to create a new named workspace (or to update one you've already created). The name of that menu is a little confusing. Once you have created your workspace, if something gets out of place, choose Window - Workspace - Reset YourNamedWorkspace to bring it back to what was saved.
You'll find that panels like to "stick together", which helps with arranging them outside of the Photoshop main window.
As an example, I use two monitors, and this is my preferred layout:
6. No, it's not possible to affect the layer names Photoshop generates, as far as I know. I have gotten in the habit of immediately naming them per their usage, so that I don't confuse myself (something that's getting easier and easier to do...).
Hope this helps!
-Noel

Questions regarding Lock Objects.

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