FOR UPDATE OF NEWEST NOWAIT
Hi,
Does anyone know the significance of the following "of newest" within the sql stmt. It is taken from the query "select sql_text from V$sql where sql_id in ('xxxxxxx')" for a given sql_id.
"FOR UPDATE OF NEWEST NOWAIT"
Regards,
Mark.
"FOR UPDATE OF NEWEST NOWAIT"NEWEST is a column of a SELECTed table.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_10002.htm#i2130052
Similar Messages
-
I have a 'for update' cursor defined with 'NOWAIT'. When soem of teh records that are supposed to be fetched by teh cursor are locked by another user for update..teh pl?SQL script returns
"ORA-00054: resource busy and acquire with NOWAIT specified" error.
If I declare teh cursor with out 'FOR UPDATE' or did NOT put 'NOWAIT' clause, teh script hangs waiting for teh records to be unlocked.
If the user opens a record in the front end (web app) and does not close it.. i can not run the script. Is theer any way to ignore those records that are locked by other users and query only ones that are available as part of the select statement in the cursor.Optimistic locking implies, essentailly, that you never lock the row. Instead, if you want to update the row, you check all the other columns of the row to see whether they have changed. In other words, you'd do a straight SELECT here and then when you went to UPDATE the data, you'd do
UPDATE <<change some column>>
WHERE col1=<<old col1 value>>
AND col2=<<old col2 value>>
AND ...If the update changed 1 row, you're set. If it changed 0 rows, someone had changed the underlying row since you SELECTED it, so you'd have to handle that condition. If it returned an error indicating that someone else had locked the row, you could handle that situation as well. If you just continue on, however, be sure that you know how to identify that this row wasn't updated so you can try to do the update the next time (assuming that makes sense).
If all your applications take the optimistic locking approach, you're pretty much guaranteed that no one else will have teh row locked, so you don't have to handle that state nearly as robustly.
Justin
Distributed Database Consulting, Inc.
www.ddbcinc.com -
Help with "select .... for update ... nowait" message
Hi,
How can I get the Oracle 10 g2 server return code issued when a cursor attemps to select ... for update nowait
and modify the control in the pl/sql block accordingly if one row is already involved in a transaction?
Many thanks
Edited by: JeanParis on Feb 9, 2009 2:57 AM
Hi again
i have done a search and I found ( dated 2004 ):
it will raise an exception 54. you have to catch it.
So that means I have to manage the cursor inside an inner block et loop until the lock is released?
Edited by: JeanParis on Feb 9, 2009 3:02 AM
Edited by: JeanParis on Feb 9, 2009 3:03 AMThe thing to be wary of is locking the session for ages. The cliched version of this problem is if the other user has gone to lunch without committing. Do we really want to tie up our user for an uunlimited amount of time?
So it's a good idea to embed the SLEEP() within a finite loop FOR in in 1..10 (or 5 or whatever) and then fail if we still can't get the lock. That at least allows our user to make a decision on whether to try again or do something else more interesting.
It becomes even important when the program is an autonomic procedure (batch job, daemon) because they are capable of spinning until the databse gets taken down.
Cheers, APC
blog: http://radiofreetooting.blogspot.com -
For Update Nowait Query Generated Implicitly by Forms
Recently we had a problem in one form because of a query getting generated implicitly by Forms with for update and nowait clause. i.e.
Select Col1, Col2, Col3 Where Rowid= :1 for update of Col1 NoWait if we change the sequence of the Fields in block by shuffling the Fields i.e Bringing Col 1 to Col3 and Col3 to Col1 the query formed is some thing like this i.e.
Select Col3, Col2, Col1 Where Rowid= :1 for update of Col3 NoWait We just want to know when this query is getting fired and how i.e. Upon firing of which trigger in Forms this is getting fired in the DB. Because we are for sure we are not firing this query either from front end or back end. We are not locking the block any where or changing the lock mode of the block programatically.
Few block level properties relevant to this
Locking Mode - Automatic
Update Changed Columns Only - Yes
Possible reasons which we feel is that when we are assigning the values to a field programattically and when more than 1 user is navigating on the same block this may happen. Because Forms doesnt knows whether the user has edited the record manually or programatically. But we have noticed this query runs even when only 1 user is connected to this schema. This is our understanding so far any ideas/suggestions to avoid this or overcome this is appreciated.
Thanks in advanceLocking Mode - Automatic or Immediate, means select for update is issued as soon as value in a base table item changed by user or programmatically.
Setting it to "Delayed" will delay lock until commit-time.
You can override this behavior by creating ON-LOCK triger. -
[ORACLE 9] Select For Update Nowait - Managing the Nowait
Hi,
Our application ( Oracle E Business R11) has a Form that allows Updates.
The problem is, when a user updates a record in the form, we want to prevent another user to open the same form, to avoid locks.
So I thought that I could
a) issue a 'select ...for update nowait',
b) get a code from Oracle
c )and use this code to prevent the form to be reopened.
I tried catching the Nowait in the exception section but I cannot get it to work.
Here is my code:
declare
v_var varchar2(40) := '---';
lv_nom tmp_delegue_jbm.del_nom%type;
begin
v_var := 'Phase 1';
select del_nom
into lv_nom
from tmp_delegue_jbm
where del_id = 3
for update of del_nom nowait;
dbms_output.put_line( 'Phase: ' || v_var );
v_var := 'Phase 2';
update tmp_delegue_jbm
set del_nom = del_nom || ' in'
where del_id = 3;
dbms_output.put_line( 'Phase: ' || v_var );
exception
when others then -- Should deal with the nowait situation
dbms_output.put_line( 'Error: ' || v_var || ' - ' || sqlerrm );
end;
[End Code]
Many thanksFar easier to poke a value into memory using DBMS_APPLICATION_INFO.SET_ACTION or SET_MODULE and have any session calling the form check first to see of another session has it already opened. Just make sure your exception handlers clear the lock.
http://www.morganslibrary.org/reference/dbms_applic_info.html -
Using for update clause in VPD(Virtual Private Databases)
Hi,
We are using for update clause in our procedure to explicitly lock rows in a particular table as shown below:
SELECT AMOUNT FROM INTERFACE_TABLE
INTO T_Amount
WHERE ROWID = :B1
FOR UPDATE OF BANK_ACCOUNT_NUM NOWAIT;
But this statement is giving the following error in VPD:
ORACLE error 1733 in FDPSTP
Cause: FDPSTP failed due to ORA-01733: virtual column not allowed here.
We need to lock rows in that particular table until the commit is issued,so as to prevent the updation of the rows which are being processed.
Is there any other way in which this can be achieved.
Thanks & Regards,
Brahmendra KashyapFrom the docs, which you didn't read:
ORA-01733 virtual column not allowed here
Cause: An attempt was made to use an INSERT, UPDATE, or DELETE statement on an expression in a view.
Action: INSERT, UPDATE, or DELETE data in the base tables, instead of the view.
Can you explain why you didn't read the docs? I'm just curious why so many people do absolutely nothing to resolve their problem (they would learn Oracle by doing so) and request to be spoon fed.
Sybrand Bakker
Senior Oracle DBA
Experts: those who did read the documentation. -
For Update Query with Wait Clause from ORACLE Forms
Hi
We are using Oracle Forms 10g running with 10g database 10.2.0.1.0. We happend to see a query which is getting generated in AWR report like Select rowid, all_columns from TableName for Update of C1 Nowait. But no such query is really written in forms and we are aware that, Any query prefixed with rowid is definitely executing from Forms. But how the ForUpdate and Nowait clause is appended to the query.
We have checked the following properties in the database Block
*1) Locking Mode is set to Automatic*
*2) Update Changed Columns only is set to YES*
*3) Query all records is set to No (Though this particular property may not be relevant to the issue)*
What is the property or setting which might trigger such a query from ORACLE Forms with ForUpdate and Nowait clause.
Any ideas/suggestions on why such behaviour. Please have a healthy discussion on this. Thanks in advance.Why have you started another thread on the same thing?
FOR UPDATE cursor is causing Blocking/ Dead Locking issues
Just use one thread to avoid confusion.
The fact that nobody has answered on the other thread for a couple of days could be to do with it being the weekend and most people are not at work.
Either be patient or, if it's more "urgent" than that, raise a SR/Tar with Oracle metalink. -
PL/SQL cursor with FOR UPDATE STATEMENT
Welcome,
I have some troubles with cursors. When I try update values in table using cursor i receive ORA-01410 Error : "INVALID ROWID".
I use code as below:
ALTER SESSION SET CURRENT_SCHEMA=TEST_SCHEMA;
DECLARE
TYPE LogTable_typ IS TABLE OF ADMIN_FILE_LOG%ROWTYPE;
v_ModuleId KTIMS.ADMIN_FILE_LOG.MODULE_ID%TYPE;
v_CDR KTIMS.ADMIN_FILE_LOG.CDR_SUCCESS%TYPE;
CURSOR c1 IS
SELECT MODULE_ID, cdr_success FROM ADMIN_FILE_LOG
FOR UPDATE OF CDR_SUCCESS NOWAIT;
BEGIN
OPEN c1;
LOOP
FETCH c1 INTO v_ModuleId,v_CDR;
IF v_ModuleId = 'LOAD' THEN
UPDATE ADMIN_FILE_LOG SET CDR_SUCCESS = 70 WHERE CURRENT OF c1;
END IF;
EXIT WHEN c1%NOTFOUND;
END LOOP;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(SQLERRM || SQLCODE);
END;
When I use ROWID in cursor declaration all works fine.Working code is:
ALTER SESSION SET CURRENT_SCHEMA=KTIMS;
DECLARE
TYPE LogTable_typ IS TABLE OF ADMIN_FILE_LOG%ROWTYPE;
v_ModuleId KTIMS.ADMIN_FILE_LOG.MODULE_ID%TYPE;
v_CDR KTIMS.ADMIN_FILE_LOG.CDR_SUCCESS%TYPE;
v_id ROWID;
CURSOR c1 IS
SELECT MODULE_ID, cdr_success, ROWID FROM ADMIN_FILE_LOG
FOR UPDATE OF CDR_SUCCESS NOWAIT;
BEGIN
OPEN c1;
LOOP
FETCH c1 INTO v_ModuleId,v_CDR,v_id;
IF v_ModuleId = 'LOAD' THEN
UPDATE ADMIN_FILE_LOG SET CDR_SUCCESS = 70 WHERE ROWID = v_id;
END IF;
EXIT WHEN c1%NOTFOUND;
END LOOP;
EXCEPTION
WHEN OTHERS THEN
DBMS_OUTPUT.PUT_LINE(SQLERRM || SQLCODE);
END;
What is difference in this two cases ?
I try to find this in Oracle documentation "Database PL/SQL User's Guide and Reference" ( http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/sqloperations.htm#i45288 ).
Please help.Hi,
I think the USE of NOWAIT clause in cursor for update is, to remove the lock immediately after the transaction is over.
In the second example where you are fetching the rowid explicitly and use the same id in loop to make the update, so there should not be any problem in this case.
In the first example when you are using CURRENT OF to do the update, it is basically work on basis of latest fetched row from cursor and do the update (but i think implicitly it use the reference of row id also).
I am not sure about it , but still try once by removing the NOWAIT clause from your cursor for update and try once , see whether you are still facing the error or not. -
For Update Query from ORACLE Forms
Hi
We are using Oracle Forms 10g running with 10g database 10.2.0.1.0. We happend to see a query which is getting generated in AWR report like Select rowid, all_columns from TableName for Update of C1 Nowait. But no such query is really written in forms and we are aware that, Any query prefixed with rowid is definitely executing from Forms. But how the ForUpdate and Nowait clause is appended to the query.
We have checked the following properties in the database Block
*1) Locking Mode is set to Automatic*
*2) Update Changed Columns only is set to YES*
*3) Query all records is set to No (Though this particular property may not be relevant to the issue)*
What is the property or setting which might trigger such a query from ORACLE Forms with ForUpdate and Nowait clause.
Any ideas/suggestions on why such behaviour. Please have a healthy discussion on this. Thanks in advance.you can't dynamically add a query to the data model in reports.
You should look into the XML based customization of Oracle Reports. This will enable you to define a report dynamically by creating a definition in XML.
Also another option is to have the report with a query in it and use lexical parameters in reports to pass the query definition or just the where part of it.
Look at the reports online help for both of these solutions. -
The Cursor's "For Update " and " Where Current of C1" Error in Form9i
Hi,
I use a cursor with for update statement. And after it, I update the table with "where current of", then it cause the forms hanged up. But In form50 of dp2k, I can run the form successfully.
The following source code are written in a Key-Next-Item
Please help me with the problem!!!!!
declare
v_cash date;
v_entno varchar2(16);
Cursor c1 is
select proc_date,entno from loan_bank for update;
begin
open c1;
loop
fetch c1 into v_cash,v_entno;
exit when c1%NOTFOUND;
update loan_bank set proc_date=sysdate where current of c1;
end loop;
commit;
close c1;
show_alert_info('OK! Done to Proc Date');
end;Hello there,
I'm also facing the same problem...
Have you found any solution or work-around yet?
The code i'm using is the following:
IS
CURSOR cur_autonum
IS
SELECT an_nr + 1
FROM autonum
WHERE an_kode ='ADV'
FOR UPDATE OF an_nr NOWAIT
RECORD_NOT_FOUND EXCEPTION;
RECORD_IS_LOCKED EXCEPTION;
PRAGMA EXCEPTION_INIT(RECORD_IS_LOCKED,-54);
BEGIN
OPEN cur_autonum;
FETCH cur_autonum INTO :ptperson.pe_nr;
IF cur_autonum%FOUND
THEN
UPDATE autonum
SET an_nr = :ptperson.pe_nr
WHERE CURRENT OF cur_autonum;
CLOSE cur_autonum;
ELSE
CLOSE cur_autonum;
RAISE RECORD_NOT_FOUND;
END IF;
EXCEPTION
WHEN RECORD_NOT_FOUND
THEN
:global.rc := fnc_alert(118);
clear_record;
previous_record;
RAISE Form_Trigger_Failure;
WHEN RECORD_IS_LOCKED
THEN
IF cur_autonum%ISOPEN
THEN
CLOSE cur_autonum;
END IF;
:global.rc := fnc_alert(119);
clear_record;
previous_record;
RAISE Form_Trigger_Failure;
WHEN OTHERS
THEN
IF cur_autonum%ISOPEN
THEN
CLOSE cur_autonum;
END IF;
RAISE;
END;
greetings,
Emiel -
How can I look for updates is Office 2016?
So, I downloaded Office 2016 for Mac. A lot of updates were going on, so I clicked CHECK FOR UPDATES MANUALLY, and now I don't know how can I see if any update is available. Help me please. Thank you~
Help me pleasee
-
My cursor for update doesn't work:(
hi, i have code:
create or replace procedure szkodowosc_STMT_WC is
date_do varchar2(8);
v_data_b1 szkod_wc_blokady_Wc_07.Data_Przetw%TYPE;
v_data_b2 szkod_wc_blokady_Wc_07.Data_Przetw%TYPE;
v_data_b3 szkod_wc_blokady_Wc_07.Data_Przetw%TYPE;
v_brak_blokady szkod_wc_blokady_Wc_07.Szkodowosc_Procent%TYPE;
v_blokada_all szkod_wc_blokady_Wc_07.Szkodowosc_Procent%TYPE;
v_blokada_za_miesiac szkod_wc_blokady_Wc_07.Szkodowosc_Procent%TYPE;
CURSOR cur_szkod_brak_blokady IS
select data_przetw, szkodowosc_procent
from szkod_wc_blokady_Wc_07
where grupa_porownanie = 'brak blokady'
order by data_przetw;
CURSOR cur_szkod_blokada_all IS
select data_przetw, szkodowosc_procent
from szkod_wc_blokady_Wc_07
where grupa_porownanie = 'blokada all' -- blokada od pierwszego stmt
order by data_przetw;
CURSOR cur_szkod_blokada_za_miesiac IS
select data_przetw, szkodowosc_procent
from szkod_wc_blokady_Wc_07
where grupa_porownanie = 'blokada za miesiac' -- blokada od drugiego stmt
order by data_przetw;
CURSOR cur_update IS
select data_przetw, blokada_all
from SZKOD_WC_BLOKADY_WC_07_results
for update of blokada_all NOWAIT;
begin
-- select * from szkod_wc_blokady_Wc_07
delete from SZKOD_WC_BLOKADY_WC_07_results;
commit;
-- przetwarzanie, brak blokady
OPEN cur_szkod_brak_blokady;
LOOP
FETCH cur_szkod_brak_blokady INTO v_data_b1, v_brak_blokady;
EXIT WHEN cur_szkod_brak_blokady%NOTFOUND;
INSERT INTO SZKOD_WC_BLOKADY_WC_07_results (data_przetw, Brak_Blokady) VALUES (v_data_b1, v_brak_blokady);
END LOOP;
COMMIT;
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.PUT_LINE(SQLERRM); -- dodac wyrzucanie logow do pliku txt
ROLLBACK;
CLOSE cur_szkod_brak_blokady;
OPEN cur_szkod_blokada_all;
OPEN cur_update;
LOOP
FETCH cur_szkod_blokada_all INTO v_data_b2, v_blokada_all;
EXIT WHEN cur_szkod_blokada_all%NOTFOUND;
FOR rec IN cur_update
LOOP
IF rec.data_przetw = v_data_b2
THEN
UPDATE SZKOD_WC_BLOKADY_WC_07_results
SET blokada_all = v_blokada_all
WHERE CURRENT OF cur_update;
END IF;
END LOOP;
COMMIT;
END LOOP;
CLOSE cur_update;
CLOSE cur_szkod_blokada_all;
-- select * from SZKOD_WC_BLOKADY_WC_07_results
end;my cur_update should update column blokada_all in SZKOD_WC_BLOKADY_WC_07_results table, but i have still NULLs here, why?
my table after update looks like:
DATA_PRZETW BRAK_BLOKADY BLOKADA_ALL BLOKADA_ZA_MIESIAC
2009-08-14 0,362
2009-08-21 0,406
2009-08-28 0,462
2009-09-04 0,509
2009-09-11 0,573
2009-09-18 0,608
2009-09-25 0,645
2009-10-02 0,68
2009-10-09 0,763
2009-10-16 0,852
2009-10-23 0,935
2009-10-30 1,059
2009-11-06 1,148
2009-11-13 1,343
2009-11-20 1,442
2009-11-27 1,554
2009-12-04 1,583
2009-12-11 1,707
2009-12-18 1,807
2009-12-25 1,878
2010-01-01 1,955
2010-01-08 2,086
2010-01-15 2,136
2010-01-22 2,361
2010-01-29 2,469
2010-02-05 2,549looking at your code (it's quite hard to follow with these table name - probably because I don't understand them), your procedure might look like
create or replace procedure szkodowosc_STMT_WC is
begin
INSERT INTO SZKOD_WC_BLOKADY_WC_07_results
select data_przetw, szkodowosc_procent
from szkod_wc_blokady_Wc_07
where grupa_porownanie = 'brak blokady'
order by data_przetw;
UPDATE SZKOD_WC_BLOKADY_WC_07_results r
SET blokada_all = (select szkodowosc_procent
from szkod_wc_blokady_Wc_07 b
where grupa_porownanie = 'blokada all'
and b.data_przetw = r.data_przetw
end;But it probably can be condensed even further by removing the UPDATE, hope you get the gist. :) -
im trying to update to newest ios version. but during the proccess, an unknown error accured, now the device wont do anything, just shows the plug into itunes screen. the device does not show in windows or itunes. the iphone wont do anything. i tried restarting, it shuts off and back on, but only shows plug into itunes thing. any ideas?
From my experience, the only way you're gonna get a PC afflicted with this disease to work with a 5th gen nano is to roll back to an earlier version of iTunes. Those affected have been exhausted by this ongoing issue. To update or not to update? And I always say never update unless you have to, and turn off all that auto update mess!
I have two core2duo lappies running 32b vista. My workflow dictates 32b fyi. One is acer aspire running itunes v 11.1 (.0.126), 5th gen nano was originally formatted and works just fine on this machine to this day. My other is the bigger badder lenovo thinkpad and the 5th gen will NOT mount using any version of itunes past 11.0 (.1.12) Windows mounts it just fine. itunes is not having it. no shirt no shoes no service.
I have both a 4th and 5th gen nano. The 4th gen works great on both machines, I even successfully tested it with the latest version (11.1.5) before subsequent deletion on the thinkpad! Weird huh? I think my next experiment might be to restore my 5th gen w/ a Mac and theeeeen plug it into PC itunez.
I'm at a loss on the thinkpad. Scanned for intruders. Cut the Lenovo bloat. Executed system and reg maintenance. Took down msconfig to a safe mode + itunes level to attempt to resolve possible sw conflicts but to no avail. NO NO NO. Every single dang port, every time on the thinkpad. Has me feeling like others might get the same treatment by the next itunes update. :|
So in summary for me:
5th gen nano and thinkpad are a NoGo on 11.1^ last working version for me = 11.0.1
5th gen nano is working on an acer aspire 11.1.0 but no way in the world am I updating
4th gen nano is kicking 5th gen nano's @zz so what would make me want to buy a new ipod? -
I update to newest Firefox and now they are gone- it looks like a completely new Firefox. What do I do? There is nothing in my toolbar, or history, or bookmarks. I have also none of my old slides or whatever they are called when I open a new tab. HELP!
You can check for problems with the <b>places.sqlite</b> database file in the Firefox profile folder.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file
*Places Maintenance: https://addons.mozilla.org/firefox/addon/places-maintenance/ -
We bought a time capsule, 1TB, then the wifi has a problem since it does not identify the existing wireless network and it says that its need to have an update firmware. The existing firmware is 7.3.1, does it have an newest update firmware existing now? Does APPLE do not provide latest firmware for this item?
How old is that Time Capsule? The fact that it still have firmware 7.3.1 suggests that it's not the latest model. The latest firmware available for my two-year-old model is version 7.5.2. Apple does provide firmware updates. You just have to let the Time Capsule download and install them. Use AirPort Utility to do that.
Regarding your Wi-Fi problem, please explain what you mean by "it does not identify the existing wireless network".
By the way, you've been misled by poor field labeling on this forum into typing a large part of your message into the field intended for the subject. In the future just type a short summary of your post into that field and type the whole message into the field below that.
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