Regardin The UPDATE statement

Hi There,
I wanted to know, whether , When we do a UPDATE , is the record locked until the COMMIT is issued? If yes what happens when UPDATE fails
Thanx in Advance

http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96524/c17trans.htm#5610
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96524/c16sqlpl.htm#1549

Similar Messages

When the update statement will check the constraint violation ?

Hello all,
i am working on data masking of production data using oracle Translate function.i have created a function otis_mask using translate function to mask sensitive values .For this i am tesitng on a small table. i have created a table with single primary key column SSN.
sql>desc SSN_MASK
Name Null? Type
SSN NOT NULL NUMBER(10)
1) i have inserted the value 9949577766. if resulted mask value exist in table it should throw the constraint violation error.But it is not throwing any error.rows are properly updating .
Eg:-
Table contains below values.
PA_DATA_SUB @qdsrih30 >select *from SSN_MASK;
SSN
7727399911
9949577766
9989477700
UPDATE SSN_MASK SET SSN=otis_mask(SSN);
if above update statement process 7727399911 first then resulted mask value is 9989477700.This value is already in the table.
if the update statement process 9949577766 first then resulted mask value is 7727399911.This value is already in the table.
in any of the above scenario update statement should have to throw constraint violation error. But its not happening. rows are properly updating . when the update statement checking the constraint violation ? after processing all the rows or processing of each row ?
Please help me in understandding the update statement processing ?
Thanks,
Venkat Vadlamudi.

1)created a function as below.
CREATE OR REPLACE Function otis_mask(incol varchar2) return varchar2 is
random_str varchar2(20);
begin
select (translate(incol,'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890','qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM0842319576')) INTO random_str FROM DUAL;
return random_str;
end;
2. create a table ssn_mask.
create table ssn_mask(ssn number(10) primary key);
3) inserted 3 rows as below.
insert into ssn_mask values(9949577766);
insert into ssn_mask values(7727399911);
insert into ssn_mask values(9989477700);
4)UPDATE SSN_MASK SET SSN=otis_mask(SSN);
5) Table contains below rows.
Sql >select *from SSN_MASK;
SSN
9949577766
7727399911
9989477700.
6)UPDATE SSN_MASK SET SSN=otis_mask(SSN);
If the above statement process first row 9949577766,then otis_mask function will return 7727399911 and update statement will update the value of 9949577766 to 7727399911 .At this case 7727399911 is already in the table.So update statement should have to throw primary key constraint violation error.
If the above statement process second row 7727399911 first ,then otis_mask function will return 9989477700.and update statement will update the value of 7727399911 to 9989477700.At this case 9989477700 is already in the table.So update statement should have to throw primary key constraint violation error.
But its not throwing any integrity constraint violation error.
i just want to know when update statement will check the constraint ?
is update statement will first process all records and kepp in handy the new values then update the table with new values (or) process the first row and update the new value with old value then process second row and update with new value so on ?
Thanks,
Venkat Vadlamudi.

What lock does the Update Statement use?

Hi All,
Does the below statement will put a row level lock or exclusive lock.
update employee set emp_name='Emp1' where emp_id=1;
Regards
W

UKJA@ukja102> drop table t1 purge;
Table dropped.
Elapsed: 00:00:00.93
UKJA@ukja102> create table t1(c1 int);
Table created.
Elapsed: 00:00:00.09
UKJA@ukja102>
UKJA@ukja102> insert into t1 values(1);
1 row created.
Elapsed: 00:00:00.00
UKJA@ukja102> commit;
Commit complete.
Elapsed: 00:00:00.03
UKJA@ukja102>
UKJA@ukja102> update t1 set c1 = 2;
1 row updated.
Elapsed: 00:00:00.00
UKJA@ukja102>
UKJA@ukja102> set serveroutput on
UKJA@ukja102>
UKJA@ukja102> col sid new_value my_sid
UKJA@ukja102>
UKJA@ukja102> select sid
2 from v$mystat where rownum = 1
3 ;
       SID
       139
Elapsed: 00:00:00.03
UKJA@ukja102>
UKJA@ukja102> exec print_table('select * from v$lock where sid = &my_sid');
ADDR                          : 695C4224
KADDR                         : 695C423C
SID                           : 139
TYPE                          : TM
ID1                           : 74212
ID2                           : 0
LMODE                         : 3
REQUEST                       : 0
CTIME                         : 0
BLOCK                         : 0
ADDR                          : 69612444
KADDR                         : 69612560
SID                           : 139
TYPE                          : TX
ID1                           : 458787
ID2                           : 13053
LMODE                         : 6
REQUEST                       : 0
CTIME                         : 0
BLOCK                         : 0
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.14DML acquires TX lock in exclusive(6) mode(row level lock) and TM lock in row exclusive(3) mode.
=======================================
Oracle Performance Storyteller
Dion Cho
http://ukja.tistory.com
http://wiki.ex-em.com/index.php/performance_in_depth
http://wiki.ex-em.com/index.php/optimizing_oracle_optimizer
=======================================

How to tune the Update statement for 20 million rows

Hi,
I want to update 20 million rows of a table. I wrote the PL/SQL code like this:
DECLARE
v1
v2
cursor C1 is
select ....
BEGIN
Open C1;
loop
fetch C1 bulk collect into v1,v2 LIMIT 1000
exit when C1%NOTFOUND;
forall i in v1.first..v1.last
update /*+INDEX(tab indx)*/....
end loop;
commit;
close C1;
END;
The above code took 24 mins to update 100k records, so for around 20 million records it will take 4800 mins (80 hrs).
How can I tune the code further ? Will a simple Update statement, instead of PL/SQL make the update faster ?
Will adding few more hints help ?
Thanks for your suggestions.
Regards,
Yogini Joshi

Hello
You have implemented this update in the slowest possible way. Cursor FOR loops should be absolute last resort. If you post the SQL in your cursor there is a very good chance we can re-code it to be a single update statement with a subquery which will be the fastest possible way to run this. Please remember to use the {noformat}{noformat} tags before and after your code so the formatting is preserved.
David

How To Insert a Row If The Update Statement Fails?

Hi folks,
For some reason I just can't get this working and wanted to throw it out to everyone, very simple one so won't take much of your time up.
Going through each row of the cursor, and wanting to update a table, if the record doesn't exist, then I want to insert it.....but nothing is happening.
IF v_related_enrolement < 1
THEN
BEGIN
-- Record NOT found in Study_block_associations
-- Insert Student record into ADM_EVER_REGISTERED table
-- Set Ever_Registered column to 'N'
UPDATE adm_ever_registered
SET ever_registered = 'N'
WHERE personal_id = v_personal_id
AND appl_code = v_appl_code;
EXCEPTION
WHEN NO_DATA_FOUND THEN
INSERT INTO adm_ever_registered VALUES(v_personal_id, v_appl_code, v_choice_no, 'N');
END;
ELSE

It's better to use a merge statement in this case.
Your code doesn't work because of the false assumption that an update statement that doesn't update a single row fails with a no_data_found exception, where it's a successful update statement that just doesn't update a single row. So instead of the exception, use a "if sql%rowcount = 0 then" construct to make your current code work. Best option, as said, is to switch to the merge statement.
Regards,
Rob.

How to test the update statement in SQLJ - Im lost and cant figure it out!

Hi Im wondering on the sytax of this logic.
//Execute an update on a table
#sql {update mytable set name = :test where today = sysdate };
//This is where im lost. how to test if the record is not found
if (record not found for update){
#sql {insert mytable set name = :test where today = sysdate };
I dont want to do a select count(*) and based on the value go to update or insert.
Does anyone know how to do it?
Thanks so much

If Software Update is offering the update then it would be compatible with your model. Unfortunately, you haven't provided us with any information on your hardware that would enable us to determine if it really is too old.
If you really wish to disable the update alert then the next time Software Update opens, select the update in the list then select "Ignore update" from SU's Update menu.

Need help on the update statement

Hi,
I have a small requirement. I have a table called test1 and it has 2 columns, nam and seq. nam is a VARCHAR2(100) and seq is a NUMBER.
In the seq I have values like, 2, 3, 7, 9, 25. I would like to update the seq value in an order such that it will be modifed like, 1, 2, 3, 4 and 5.
Here is the scripts, I have used.
CREATE TABLE test1
(nam VARCHAR2(100),
seq NUMBER);
INSERT INTO test1 VALUES('AAA', 2);
INSERT INTO test1 VALUES('BBB', 3);
INSERT INTO test1 VALUES('CCC', 7);
INSERT INTO test1 VALUES('DDD', 9);
INSERT INTO test1 VALUES('EEE', 25);
COMMIT;
And, I would like to achive this in a simple single DML statement. (The required output would be something like, AAA - 1, BBB - 2 etc,...)
I have tried the following query. It is working fine. But If I have a better solution to it, I would to implement the same.
UPDATE test1 a
SET seq =
(SELECT rn
FROM (SELECT ROW_NUMBER() OVER(ORDER BY seq) rn FROM test1) x
WHERE a.rowid = x.rowid);
PS: I am using Oracle 11.2.0.2.0 (11g)
Thanks In Advance!
With Regards,
VST

SQL> CREATE TABLE test1
2   (nam VARCHAR2(100),
3    seq NUMBER);
Table created.
SQL> INSERT INTO test1 VALUES('AAA', 2);
1 row created.
SQL> INSERT INTO test1 VALUES('BBB', 3);
1 row created.
SQL> INSERT INTO test1 VALUES('CCC', 7);
1 row created.
SQL> INSERT INTO test1 VALUES('DDD', 9);
1 row created.
SQL> INSERT INTO test1 VALUES('EEE', 25);
1 row created.
SQL> COMMIT;
Commit complete.
SQL> select * from test1;
NAM                                                                                                         SEQ
AAA                                                                                                           2
BBB                                                                                                           3
CCC                                                                                                           7
DDD                                                                                                           9
EEE                                                                                                          25
5 rows selected.
SQL> update test1 set seq = rownum;
5 rows updated.
SQL> select * from test1;
NAM                                                                                                         SEQ
AAA                                                                                                           1
BBB                                                                                                           2
CCC                                                                                                           3
DDD                                                                                                           4
EEE                                                                                                           5
5 rows selected.

How can I get a Quicktime update when the update states that an MSI for the previous version is missing

How do you get a new version of Quicktime when it states that the msi for the old version is no longer available?

Download the Windows Installer CleanUp utility from the following page (use one of the links under the "DOWNLOAD LOCATION" thingy on the Major Geeks page):
http://majorgeeks.com/download.php?det=4459
To install the utility, doubleclick the msicuu2.exe file you downloaded.
Now run the utility ("Start > All Programs > Windows Install Clean Up").
In the list of programs that appears in CleanUp, select any QuickTime entries and click "Remove", as per the following screenshot:
Quit out of CleanUp, restart the PC. Now try another QuickTime install. Does it go through properly this time?

REGARDIN THE UPDATION OF TEXT DATA IN BW

hi,
this is a scenario updating flatfile to bw server.
i have problem in updating text data.when i create info package in infosources, i get a pop-up that "SELECT THE LANGUAGE FIELD IN THE SOURCE SYSTEM->LONG TEXT".and after if i continue while updating i get a error message that "NO TRANSFER STRUCTURE AVAILABLE ALL_SS_AL_MAT_TEXT (SY-SUBRC= " .can anyone help me in this.
thanks in advance.

Hi Mahesh..how do u want to do this that the qn..
do u have two infoobjects in which you want to load that master data.......?
If you have then make transformation ....between them and load using routine..
using offset in the routine.
i.e.
Infoobject Source(text Datasource)---> Infoobject A
routine:
result = source_fields-sourceinfoobjec+0(4).
In the second transformation
Infoobject Source(text Datasource)---> Infoobject B
routine:
result = source_fields-sourceinfoobjec+4(4).
regards,
rk

How to add the update statement in this procedure?

I have one table usersubscription (userid,newsletterid,deleted)
I got one string from user e.g. ('1,2,3') and userid = 14
I wrote proceduer that will insert this records in to usersubscription table;
userid     newsletterid     deleted
14     1          n
14     2          n
14     3          n
default value of deleted column is 'n'.
my procedure is as follows;
CREATE OR REPLACE PROCEDURE usersubscription_procd1 (vuserid in number, vnewsletterid IN VARCHAR2)
AS
I NUMBER;
J NUMBER;
VAL VARCHAR2(100);
BEGIN
     I := 1;
     J := 1;
     WHILE INSTR(vnewsletterid,',',I) != 0 LOOP
     VAL := SUBSTR(vnewsletterid,I,INSTR(vnewsletterid,',',I)-J);
     I := INSTR(vnewsletterid,',',I)+1;
     J := I;
     INSERT INTO usersubscription (usersubcriptionid,userid,newsletterid)
     VALUES (usersubscription_seq.nextval,vuserid,VAL);
     END LOOP;
     VAL := SUBSTR(vnewsletterid,I,LENGTH(vnewsletterid));
     INSERT INTO usersubscription (usersubcriptionid,userid,newsletterid)
     VALUES (usersubscription_seq.nextval,vuserid,VAL);
END;
Now one requirement is that when new string comes for same userid e.g.('1,4,5') userid = 14
then the deleted column for 1 and 2 newsletterid changes to 'y';
please tell me the solution.
Prathamesh.

Hi,
Before your loop, you can make something else like :
SQL> select * from test;
    USERID NEWSLETTERID D
        14            1 n
        14            2 n
        14            3 n
SQL> update test
2 set deleted = 'y'
3 where instr('1,4,5',newsletterid,1) = 0
4 and userid = 14;
2 ligne(s) mise(s) à jour.
SQL> select * from test;
    USERID NEWSLETTERID D
        14            1 n
        14            2 y
        14            3 y
SQL> HTH,
Nicolas.

Update Statement Duplicates the record

Hi guys.
I have created a form to update some null fields in a table.
the update statement updates the fields and at the same time it duplicates the updated data in new record.
my update statement is
update
REQ_TRANSACTION set
PAYMENT_METHOD                =:PAYMENT_METHOD,
PAID_THROUGH                =:PAID_THROUGH,
REMARKS                     =:REMARKS,
CHEQUE_NO                =:CHEQUE_NO,
TRAN_NO                     =:TRAN_NO,
PAID_AMOUNT                =:PAID_AMOUNT,
PAY_DATE                =:PAY_DATE
where
req_no      = :req_no;
COMMIT_FORM;
plz help
Edited by: Mohammed on Nov 12, 2011 3:15 AM

Be aware that what you do is nt the preferred way to work with forms. The best way would be to make your block a database block based on your table, put something in the WHERE-clause and populate the block using an EXECUTE_QUERY. then, do update changed data in the block, just issue an COMMIT_FORM, the update itself will be done by forms .

Return Into. Can I return the old value in an update statement?

Hello - I have an update statement and I need the value of a field, prior to the update. Is it possible to use the Return Into to do this? Or do I have to have a separate select statement prior to the update statement in order to store that value in a variable?
Thanks!

RETURNING INTO is valid for an UPDATE, but it returns the new value, not the old value.
SCOTT @ nx102 Local> select * from a;
      COL1
         4
Elapsed: 00:00:00.00
SCOTT @ nx102 Local> ed
Wrote file afiedt.buf
1 declare
2    l_old_col1 number;
3 begin
4    update a
5       set col1=col1+1
6     returning col1 into l_old_col1;
7    dbms_output.put_line( l_old_col1 );
8* end;
SCOTT @ nx102 Local> /
5
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00If you are trying to track historical changes, have you looked at Workspace Manager? That can be far easier than writing your own change tracking code...
Justin

Update statement for modifying day of the month

Hi,
i hope there is an easy answer to a question i'm probably over thinking. i have a situation where i need to update all the days in a date field to a certain day of the month regardless of the month or year. Here is an example of a small number of dates in the table:
07/28/2004
04/21/2008
12/21/2011
08/21/2006
04/04/2008
04/16/2012
08/13/2011
03/01/2006
04/17/2012
So, for each of these dates the day (or DD) would need to be converted to the 15th (ie. 07/15/2004, 04/15/2008, 12/15/2011, etc). I've used to_char to pull out just the DD, but am unsure what the update statement would need to look like. Any assistance would be greatly appreciated. Thank you!

If you don't care about the time component
UPDATE your_table
SET your_column = trunc(your_column,'MM') + 14Justin
Edited by: Justin Cave on Apr 26, 2012 9:47 PM
Off by 1. Should be +14 not +15

Decode function in Update statement

Hello everyone,
I'm trying to write a query where I can update a pastdue_fees column in a book_trans table based on a difference between return_dte and due_dte columns.
I am using Oracle SQL. This is what I have so far for my decode function:
SQL> SELECT
2 DECODE(SIGN((return_dte - due_dte)*2),
3 '-1', '0',
4 '1', '12', 'Null')
5 FROM book_trans;
DECO
Null
12
Null
0
So the logic is that if the sign is -1, the value in return_dte column should be 0; if it's +1 then it's 12 and everything else is Null.
So now, I need to enter my decode function into the update statement to update the columns. However, I get error messages.
The logic should be:
UPDATE book_trans SET PastDue_fees = decode(expression)
I've given it a couple of different tries with the following results:
SQL> UPDATE book_trans
2 SET pastdue_fees = SELECT
3 DECODE(SIGN((return_dte - due_dte)*2),
4 '-1', '0',
5 '1', '12', 'Null')
6 FROM book_trans;
SET pastdue_fees = SELECT
ERROR at line 2:
ORA-00936: missing expression
SQL> UPDATE book_trans
2 SET pastdue_fees =
3 DECODE(SIGN((return_dte - due_dte)*2),
4 '-1', '0',
5 '1', '12', 'Null')
6 FROM book_trans;
FROM book_trans
ERROR at line 6:
ORA-00933: SQL command not properly ended
Any help or tips would be greatly appreciated as I've been taking SQL for about six weeks and not very proficient!
Thanks!

882300 wrote:
Hello everyone,
I'm trying to write a query where I can update a pastdue_fees column in a book_trans table based on a difference between return_dte and due_dte columns.
I am using Oracle SQL. This is what I have so far for my decode function:
SQL> SELECT
2 DECODE(SIGN((return_dte - due_dte)*2),
3 '-1', '0',
4 '1', '12', 'Null')
5 FROM book_trans;
DECO
Null
12
Null
0
So the logic is that if the sign is -1, the value in return_dte column should be 0; if it's +1 then it's 12 and everything else is Null.
So now, I need to enter my decode function into the update statement to update the columns. However, I get error messages.
The logic should be:
UPDATE book_trans SET PastDue_fees = decode(expression)
I've given it a couple of different tries with the following results:
SQL> UPDATE book_trans
2 SET pastdue_fees = SELECT
3 DECODE(SIGN((return_dte - due_dte)*2),
4 '-1', '0',
5 '1', '12', 'Null')
6 FROM book_trans;
SET pastdue_fees = SELECT
ERROR at line 2:
ORA-00936: missing expression
SQL> UPDATE book_trans
2 SET pastdue_fees =
3 DECODE(SIGN((return_dte - due_dte)*2),
4 '-1', '0',
5 '1', '12', 'Null')
6 FROM book_trans;
FROM book_trans
ERROR at line 6:
ORA-00933: SQL command not properly ended
Any help or tips would be greatly appreciated as I've been taking SQL for about six weeks and not very proficient!
Thanks!If you really really really want to update the entire table, the syntax would be...
UPDATE book_trans
SET
pastdue_fees = DECODE(SIGN((return_dte - due_dte)*2), -1, 0, 1, 12, Null);I took out all the single quotes. If you actually have a string column and you're storing entirely numbers in it then it should be declared as a NUMBER column and not a character (varchar2) column.
ALWAYS use the proper data type, it'll save you a ton of headaches in the future.
Also, since you're new to the forum, please read the FAQ so you learn the etiquette and what not.
http://wikis.sun.com/display/Forums/Forums+FAQ

Error while schedulingg update stat in db13

Dear Experts,
Please look into my issue we are facing an error while scheduling update statistics in db13 and I tried to open detailed log
It is given
SXPG_COMMAND_EXECUTE failed for BRTOOLS - Reason: program_start_error: For More Information, See SYS
Please help me how to solve this my error
Regards

Hi,
Check the owner for BRBACKUP, BRARCHIVE, and BRCONNECT in kernel,
these files should be with SIDADM, if not change the owner to SIDADM and rerun the update stats.
and also Refer the note 446172
Regards,
Ram

Regardin The UPDATE statement

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