Reducing No of Locks on Database tables

Hi,
Thank You very much in advance for reading this thread.
My requirement is to update the Data base table NAST with minimum no of locks on it.
Can you please advise me which one i suppose to follow from the below mentioned 2 approaches.
1) Update the NAST data base table with each record with in the loop and execute the Commit Work statement after a certain number of records are updated.
2) Insert the total no of records at a time by using the INSERT statement and execute the Commit statement.
Regards,
K.Krishna Chaitanya.

try the second option as it will do the db update in a single shot and it also depends on the way UPDATE work process perf.

Similar Messages

On Insert, the database table is locked

Dear all,
I am asking your help please in this question,
In Forms Runtime, when a user tries to insert a record and before saving the transaction "Save", the program locks the database table and any other user cannot use this function in all branches.
Does anybody has an idea about what could be the main issues to search about.
Thank you very much, I appreciate your suggestions.

user562674 wrote:
cannot use this function in all branches.What you mean by use this function in all branches ?
Is it a function or procedure or forms ?

Locking multiple records in a database table at a time

Hi Experts,
   I have a requirement to lock multiple records in the database table for writing. I have created lock object in SE11. But with this we have only 2 possibilities either lock entire table or lock a single record at a time.
   My requirement is, i have table with key field PROJECTID. I want more than one project to be locked, but not the complete table. I dont have any other field in the table to compare.
Thanks in advance..
Regards,
Asrar

Hi ,
Try with FOR UPDATE in the SELECT sentence.
SELECT FOR UPDATE *
    INTO Internal_Table
FROM Table
WHERE Conditions.
UPDATE "Table_name" FROM TABLE Internal_Table.
COMMIT WORK.
This sentence blocks only the records that satisfy of the WHERE conditions (not the entire table) and unlocks after commit work.
Hope this information is help to you.
Regards,
José

How to lock a database Z table before updating it through a report program

Hi,
How to lock a database Z table before updating it through a report program and also how to unlock it after my updation.
The whole process is done through report program.

Hi,
Go to SE11, in the option 'Lock object' enter the name of your lock,
begin with 'E', suppose 'EXXXX' And create. In tab 'Tables' fill the
table name where the record you want to lock exist and select the
lock mode. Lock mode can be shared and exclusive. If 'shared',
when you lock the record, other can also read data, but can not
modify. If 'exclusive', when you lock the record, other can neither
read nor modify the record. After save and activate, you will get two
function module.'ENQUEUE_EXXXX' to lock record,
'DEQUEUE_EXXXX' to release lock on one record.
When use this function module it only lock one record at a time. It
does not lock the table.
Regards,
Omkaram.

Database table problem

hi expert,
I have one expert routine with insert command in it. While DTP are running I change the status request to green, but after that I run again and the system can not insert record to database table. I wait for along time and system can perform insert command again to this database table. But again if I change the status to green when DTP request have not finished, the system can not perform insert command. Is the database table is lock or what? and How can I perform insert command immediately after stopping process.

Hi bwaugh06
You may use a text edit control instead od table control and store the content in a field of type STRING: No space wasted if no data is there but you have unlimited length.
Regards,
Clemens

Re: what is difference between sap locking and database locking

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
   MODE_MARA            = 'S'
   MANDT                = SY-MANDT
   MATNR                = 'SOU-1'.
call transaction 'MM02'.
CALL FUNCTION 'DEQUEUE_EZTEST3'
     EXPORTING
          mode_mara = 'E'
          mandt     = sy-mandt
          matnr     = 'SOU-1'.
IF sy-subrc = 0.
WRITE: 'IT IS unlocked'.
ENDIF.

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.
Physical locks in the database system are therefore insufficient for the requirements of an R/3 transaction. Locks in the R/3 System must remain set for the duration of a whole SAP LUW, that is, over several dialog steps. They must also be capable of being handled by different work processes and even different application servers. Consequently, each lock must apply on all servers in that R/3 System.
SAP Locks:
To complement the SAP LUW concept, in which bundled database changes are made in a single database LUW, the R/3 System also contains a lock mechanism, fully independent of database locks, that allows you to set a lock that spans several dialog steps. These locks are known as SAP locks.
The SAP lock concept is based on lock objects. Lock objects allow you to set an SAP lock for an entire application object. An application object consists of one or more entries in a database table, or entries from more than one database table that are linked using foreign key relationships.
Before you can set an SAP lock in an ABAP program, you must first create a lock object in the ABAP Dictionary.

JDeveloper 11g: How to get all the rows of a database table from applicatio

Hello all!
I'm developing a application with JDeveloper 11g, like subject show.
So, I'm suppose to use some data which are in database table.
So, I had the View Object where I want take data, to the datamodel.
And after this, I use this next line in my serviceClass.java:
public String method(){
        String truc = null;
        getViewName().setRangeSize(-1);
        getViewName().setRangeStart(0);
        getViewName().executeQuery();
//I do my treatment here
return truc
}When the application run, it stop just before the line "getViewName().setRangeSize(-1);"
So, I think it is the locking point.
Someone can help me.
Thank's
Nystan

Hi,
1. You work with a application module class and not in a plain old java object? So you create a application module or only a view object?
2. If you work with a application module class. Can you switch on a bit of logging? To set the system debug output property, open the Run/Debug/Profile page in the Project Properties dialog for your data model project. Click Edit to edit the chosen run configuration, and add following string to the Java Options field in the page.
-Djbo.debugoutput=console -Djbo.adflogger.level=FINE
maybe you can see the error.
Best regards
Martin

Optimize delete in a very big database table

Hi,
For delete entries in database table i use instruction:
Delete from <table> where <zone> = 'X'.
The delete take seven hours (the table is very big and <zone> isn't an index)
How can i optimize for reduce the delete time.
Thanks in advance for your response.
Regards.

what is the size of the table and how many lines are you going to delete?
I would recommend you to delete only up to 5000 or 10000 records in one step.
do 100 times.
select *
          from
          into table itab.
          where
          up to 10.000 records.
if ( itab is initial )
exit.
endif.
delete ... from table itab.
commit work.
If this is still too slow, than you should create a secondary index with zone.
You can drop the index after the deletion is finished.
Siegfried

Lock escalation on table with no key/index

Hi,
I've got the table with single column only (int) and no indexes nor pk/uq, just auto-created statistics.
now, in transaction, there is a command: SELECT <COL> FROM <TABLE> WITH (ROWLOCK UPDLOCK) WHERE <COL>=100
Table has variable num of records but it doesn't go over 200k, usually below 60k. Column values are mostly unique but can be duplicated in minor portion.
Question 1: when this select executes, what will be locked - row, page or entire table?
Question 2: if I have PK/UQ/index and execute same SELECT as above, what will locked then?

Hi,
1. Please note that every lock taken by sql server has some memory associated with it so more the number of locks more memory it will use. To avoid this unnecessary usage sql server uses Lock escalation when it deems necessary that it would be better to
lock whole table instead of locking whole row.
There is no use here using UPDLOCK with select statement, it would just change locking behavior and would force U lock lets see example
I have a table having structure as
CREATE TABLE [dbo].[Logging](
[Id] [int] IDENTITY(1,1) NOT NULL,
[c1] [char](50) NOT NULL DEFAULT ('SOME MORE DATA')
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
it ha some 20 K records now lets concentrate on query which you asked
begin transaction
select @@SPID,ID,C1 from dbo.Logging with (ROWLOCK,UPDLOCK) where id=12
--commit
To see locks taken by this query we would run below query in other SSMS window
Select
resource_type,
request_mode,
request_status,
request_session_id
from sys.dm_tran_locks
where resource_database_id=11--databse ID
below is result
You can see update lock bein taken on row and IX intent exclusive lock on object that is table and shared lock on database.
Now if we change the query to scan whole table like below
Now you can see Only exclusive lock is taken on whole table instead of taking on every row. If you see the query every row has predicate 'some more data' so ultimately a table scan would be required .
Above is assuming default Isolation level
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP

Modify database table from internal table

Hi All,
I need to update database table from internal table which is having around 30000 records.
I am using MODIFY tabname FROM TABLE int_tabname...
Using this statement, I can modify the databse records very well. But user has some additional requirement.
He wants that the table should be modified from the internal table and after modification we should have the erroneous records to be displayed if any.
e.g. if 1500 records out of 30000 are erroneous then only 28500 records should be updated and 1500 records should be displayed as erroneous records so that the user can correct them and use them again for executing the program.
Is there any FM which imports the database table name and internal table, modifies the database and exports an internal tanle with erroneous records?
Any help will be appriciated,
Regards,
Neha

Hi
modifying datbase table useing internal table
<b>advises</b> before updating this datbase table plz lock that table to avoid incosistency
write the logic for modifying
Modify the database table as per new dunning procedure
MODIFY fkkvkp FROM TABLE lt_fkkvkp   .
and finally unlock the table
<b>example</b>
*To lock table for further operations
constants: lc_tabname TYPE rstable-tabname VALUE 'FKKVKP' . "FKKVKP
CALL FUNCTION 'ENQUEUE_E_TABLE'
    EXPORTING
      tabname        = lc_tabname
    EXCEPTIONS
      foreign_lock   = 1
      system_failure = 2
      OTHERS         = 3.
IF sy-subrc EQ 0.
To fetch all the contract accounts for customers of the segment
Households/SME.
    PERFORM fetch_contract_accounts using lc_tabname .
ENDIF.                    " IF sy-subrc EQ 0.
*wrote the logic
Modify the database table as per new dunning procedure from internal table
MODIFY fkkvkp FROM TABLE lt_fkkvkp   .
*unlock the tbale
CALL FUNCTION 'DEQUEUE_E_TABLE'
   EXPORTING
     TABNAME   = uc_tabname .
<b>Reward if usefull</b>

Select record from database table

how to select a record from data-base table for current month in module-pool, i.e if current month is august then records selected should between 1/08/10 to 31/08/10.
And, i also want to select records for last month i.e if current month is august then records selected should be between 1/07/10 to 31/07/10.
And one thing more, it should work for every scenario. Like for months are changing then it should work according to that.
Example: If month changes to October then current month ll be October and last month ll become September.
Plz help me out.
Moderator message: you chose a better forum this time, but the question is still too basic to be asked here, please (re)search yourself first, these forums are not catering to beginners.
locked by: Thomas Zloch on Aug 8, 2010 9:41 PM

Hi Nishant,
You can use the option <b>ORDER BY </b> in your SELECT clause.
This is the SAP Documentation for <b>ORDER BY </b> option.
<i>Variant 1</i>
<b>...ORDER BY PRIMARY KEY</b>
<b>Effect</b>
Sorts the selected lines in ascending order by the primary key of the database table. This variant is only permitted for SELECT * ....
<i>Notes</i>
Since views do not have a primary key, specifying ORDER BY PRIMARY KEY only makes sense with database tables. If, however, you do specify ORDER BY PRIMARY KEY with a view, all fields of the view are sorted in ascending order.
<i>Variant 2</i>
<b>ORDER BY f1 ... fn</b>
<i>Effect</i>
Sorts the selected records in ascending order by the specified column references f1 ... fn. If a list is also specified in the SELECT clause, the column references f1, ..., fn must appear in this list.
By supplementing the statement with DESCENDING, you can sort in descending order using any of the fields f1, ..., fn.
The default sort sequence is ascending order, but you can make this explicit by adding the addition ASCENDING.
Consider this code this will select the latest 10 records form DB table(Note can use <b>Variant 2</b> for DB tables also.
REPORT zarun_1.
DATA : it_mara TYPE STANDARD TABLE OF mara WITH HEADER LINE.
START-OF-SELECTION.
SELECT * FROM mara
            INTO TABLE it_mara
            <b>UP TO 10 ROWS                "No of rows you need(give 1 here)
           ORDER BY matnr DESCENDING.    "Specify the Key Fields here.</b>
LOOP AT it_mara.
    WRITE : / it_mara-matnr,
              it_mara-mtart.
ENDLOOP.
Regards,
Arun Sambargi.
Message was edited by: Arun Sambargi

Need help in updating database table from screen fields

Hi,
Can anyone tell me how to update the database table with the entries given in the fields of a screen ?...a procedure-wise explanation would be very helpful.
Thank you.
Moderator message: sorry, no beginner forums here, please search for available information or attend training.
locked by: Thomas Zloch on Aug 12, 2010 3:16 PM

Hi,
Can anyone tell me how to update the database table with the entries given in the fields of a screen ?...a procedure-wise explanation would be very helpful.
Thank you.
Moderator message: sorry, no beginner forums here, please search for available information or attend training.
locked by: Thomas Zloch on Aug 12, 2010 3:16 PM

Persist XML Data to Database Table - Generic XML Schema

Hi,
I would like to represent data in XML format and persist to any database tables.
The ideal xml is like:
<TABLE NAME="TABLE1">
<TABLEDEF><COLUMN NAME="COLUMN1"/><COLUMN NAME="COLUMN2"/></TABLEDEF>
<ROW><COLUMN VALUE="value1"/><COLUMN VALUE="value2"/></ROW>
<ROW><COLUMN VALUE="value11"/><COLUMN VALUE="value22"/></ROW>
</TABLE>
<TABLE NAME="TABLE2">
</TABLE>
The XML could then be parsed, and saved to database with JDBC by manually composing the statement strings.
To reduce the coding effort (xml parsing, JDBC connection, etc), are there any open source projects available to achieve the above purpose? The popular O/R mapping tools like Hibernate, Castor, etc, can't handle this scanario because they require the knowledge of the tables on the server side in order to create the mapping files in advance.
Thanks for the help!

Hi,
I would like to represent data in XML format and persist to any database tables.
The ideal xml is like:
<TABLE NAME="TABLE1">
<TABLEDEF><COLUMN NAME="COLUMN1"/><COLUMN NAME="COLUMN2"/></TABLEDEF>
<ROW><COLUMN VALUE="value1"/><COLUMN VALUE="value2"/></ROW>
<ROW><COLUMN VALUE="value11"/><COLUMN VALUE="value22"/></ROW>
</TABLE>
<TABLE NAME="TABLE2">
</TABLE>
The XML could then be parsed, and saved to database with JDBC by manually composing the statement strings.
To reduce the coding effort (xml parsing, JDBC connection, etc), are there any open source projects available to achieve the above purpose? The popular O/R mapping tools like Hibernate, Castor, etc, can't handle this scanario because they require the knowledge of the tables on the server side in order to create the mapping files in advance.
Thanks for the help!

Ways to reduce downtime for filling up setup table

Hi Experts,
Can anyone tell me the step by step process so that i can reduce downtime for filling up setup tables?
I know that setup tables can be filled by considering sales document numbers....but the further steps are not clear with me...........specially with data loadin till PSA and then to ODS/Cube
So plz throw some light on this.......
Regards,
Vaishnavi.

Hi,
You will need to fill the set up tables in 'no postings period'. In other words when no trasnactions are posted for that area in R/3 otherwise those records will not come to BW. Discuss this with end user and decide. Weekends are a general choice for this activity.
You can run them after business hours so that there wont be any transactions, or in the night times or you can do it on week ends so that there is no need to take down time.
Fill the setup tables with already closed values and then fill up again with open values.This will reduce the down time.
Initialize closed periods first in which users wont enter data ( for example in 2007 or 2006), this initializations can be done while users are working. Then the initialize last period at night/weekends.holidays etc.
If you know documents that are in closed periods, and you are sure that these documents can no longer be changed, you can only fill the SetUp tables for these documents or only for these periods, by continuing to post in open periods. You then initialize only for these intervals, delete the setup table, and only then do you fill the setup table with the rest of the documents this procedure can drastically reduce the downtimes of your system.
However, there is a risk that user exits (and in LIS, formulas and conditions) can be used to retrieve documents that are in periods that are already "closed periods".
One more thing what you need to bear in mind is, to check if there are any Scheduled jobs which are updating the transaction tables, which would definitely cause Data Reconciliation Issues.
Try Early Delta Initialization
With early delta initialization, you have the option of writing the data into the delta queue or into the delta tables for the application during the initialization request in the source system. This means that you are able to execute the initialization of the delta process (the init request), without having to stop the posting of data in the source system. The option of executing an early delta initialization is only available if the DataSource extractor called in the source system with this data request supports this.
Extractors that support early delta initialization are delivered with Plug-Ins as of Plug-In (-A) 2002.1.
You cannot run an initialization simulation together with an early delta initialization.
Hope this link may make you clear about Early Delta Initialization
http://help.sap.com/saphelp_nw04s/helpdata/en/80/1a65dce07211d2acb80000e829fbfe/frameset.htm
http://www.allinterview.com/showanswers/2907.html
http://sap.ittoolbox.com/groups/technical-functional/sap-bw/early-delta-initialization-459379
http://books.google.co.in/books?id=qYtz7kEHegEC&pg=PA293&lpg=PA293&dq=early+delta&source=web&ots=AM1PtX6wcZ&sig=xKOF85Gb8UtszY44zt06K6R0n3M&hl=en#PPA290,M1
http://www.blackwellpublishing.com/journal.asp?ref=1069-6563&site=1
EARLY DELTA
Early delta Initialization
How To Minimize Downtime For Delta Initialization
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/5d51aa90-0201-0010-749e-d6b993c7a0d6
How To Minimize Effects of Planned Downtime (NW7.0)
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/901c5703-f197-2910-e290-a2851d1bf3bb
Note 753654 - How can downtime be reduced for setup table update
602260 - Procedure for reconstructing data for BW
437672 - LBWE: Performance for setup of extract structures
436393 - Performance improvement for filling the setup tables
Note 739863
/thread/756626 [original link is broken]
Re: How to Setup and INIT from 2LIS_13_VDITM with millions of records
How downtime can be reduced for setup table update.
Fill setup tables without locking users
Initialization Setup Tables.
Hope this helps.
Thanks,
JituK

Lock object for table KNVP and KNVK

Hello Friends,
Can you please tell me the standard lock object for the table KNVP and KNVK.
Thank and regards,
Kuldeep

Hi
see this and do accordingly
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
Regards
Anji

Reducing No of Locks on Database tables

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