What is lock table

what is lock table

Hi
1)Go to se11 transaction.
2)Click on lock object radio button and give a lock object name starting with 'E'.For example 'ESAMPLE'.Click CREATE.
3)In the TABLE tab, you can give the table name for which you require a lock.In the LOCK PARAMETERS tab,you can give the table fields based on which the table should be locked.
4)Call a function module in your program ENQUEUE_lockobjectname to obtain a lock on the required table.In our example the FM will be ENQUEUE_ESAMPLE.
5)To release the lock on the table,call the function module DEQUEUE_lockobjectname.In our example the FM will be DEQUEUE_ESAMPLE.
Lock objects are use in SAP to avoid the inconsistancy at the time of data is being insert/change into database.
testing the locking of tables...
data: varkey like rstable-varkey.
varkey = sy-mandt.
locking the tables............................
call function 'ENQUEUE_E_TABLE'
exporting
MODE_RSTABLE = 'E'
tabname = 'MARA'
varkey = varkey
X_TABNAME = ' '
X_VARKEY = ' '
_SCOPE = '2'
_WAIT = ' '
_COLLECT = 'X'
exceptions
foreign_lock = 1
system_failure = 2
others = 3
case sy-subrc.
when 1.
message i184(bctrain) with 'Foreignlock'.
when 2.
message i184(bctrain) with 'system failure'.
when 0.
message i184(bctrain) with 'success'.
when others.
message i184(bctrain) with 'others'.
endcase.
unlocking the table...............
call function 'DEQUEUE_E_TABLE'
exporting
MODE_RSTABLE = 'E'
tabname = 'MARA'
varkey = varkey
X_TABNAME = ' '
X_VARKEY = ' '
_SCOPE = '3'
_SYNCHRON = ' '
_COLLECT
<REMOVED BY MODERATOR>
preet
Edited by: Alvaro Tejada Galindo on Jun 12, 2008 6:21 AM

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Hi,
Symptom
Key word: Enqueue
FM: A system error has occurred in the block handler
Message in the syslog: lock table overflowed
Other terms
M3021 MM02 F5 288 F5288 FBRA
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www.oraclebrains.com<a>
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Hi gurus what is lock objects in datadictionary ,can explain with example

hi gurus what is lock objects in datadictionary ,can explain with exple

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.
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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.
Here is a Link with good example
Lock Objects
Look the following Links for additionl info.
http://help.sap.com/saphelp_nw04/helpdata/en/c2/2d7037ecc92a7ee10000009b38f8cf/content.htm
http://help.sap.com/saphelp_nw70/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
http://articles.techrepublic.com.com/5100-6329_11-5066352.html
Hope this Helps

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Hi,
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FORM locktable USING P_ITAB_TABNAME.
CALL FUNCTION 'ENQUEUE_E_TABLE'
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X_VARKEY = ' '
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_WAIT = ' '
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EXCEPTIONS
FOREIGN_LOCK = 1
SYSTEM_FAILURE = 2
OTHERS = 3
IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
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ENDIF.
ENDFORM. " locktable
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Hello Srinivas,
Please take a look at the below link.
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