For update in select statement

i have a table which store data in a clob. sometimes user forget to add and extra carriage return after last line. so i am doing the following to modify the clob
SELECT file_content INTO lv_lob FROM files WHERE id = p__id FOR UPDATE;
dbms_lob.writeappend(lv_lob,2,C_NEW_LINE);
C_NEW_LINE CONSTANT VARCHAR2(2) := Chr(13)||Chr(10);
'for update' should only lock that specific row since id is a pk key in the table.
i have two front end screen where people upload file. a unique id is generated for each file and the data with id inserted in the table. user can upload file from the two different screen at same time.
the problem is that i am getting a 'resource busy and acquire with NOWAIT specified' error. i don't know why if every file i upload belongs to different row.
anybody knows why i would get this error and how can i solve it?

How are you generating the unique ID? Are you using a sequence? Or are you using something that forces serialization?
Where in the program flow are you adding the extra carriage return?
Is it this SELECT statement that is throwing the error? Or is it being thrown somewhere else?
Justin

Similar Messages

Hint in Update or Select Statement in an inline query ??

Hi ,
I had an update statement that will get the data from the inline select statement,now where can i can keep the hint ,either in update statement or in Select statement...
Please let me know if my sample script is wrong or any better way to approach...Please assume that Salary table had millions of employee's salary records.
update emp
set salary = salary + (select /*+ full(a) parallel(a,4) */ salary from Salary
where experience > 5 and empno = 55 )
where empno = 85Thanks
Rede

You would put the hint in the select statement as you have it, but it won't work until you alias your table name to "a" since that is how you are referencing it in the hint:
update emp
set salary = salary + (select /*+ full(a) parallel(a,4) */ salary from Salary a
where experience > 5 and empno = 55 )
where empno = 85
NOTE I added the "a" right after the Salary table name AND you can only do parallel updates on partitioned table, but the select will run in parallel to at least get the data for you quickly.
To answer your other question about syntax, it is incorrect and there are a lot of ways to write it but a straight forward way would be to use the merge statement
merge into emp e
using (select /*+ full(s) parallel(s,4) */ s.salary from salary s where s.experience > 5) s
on (e.empno = s.empno)
when matched then update
set salary = s.salary;

Using Hint in Update or Select Statement...

Hi ,
I had an update statement that will get the data from the inline select statement,now where can i can keep the hint ,either in update statement or in Select statement...
Please let me know if my sample script is wrong or any better way to approach...Please assume that Salary table had millions of employee's salary records.
update emp
set salary = salary + (select /*+ full(a) parallel(a,4) */ salary from Salary
where experience > 5 and empno = 55 )
where empno = 85Thanks
Rede

The better approach would be to determine why you need a hint in the first place. If you're using a hint, that implies that the optimizer is choosing the incorrect plan when left to its own devices. That, in turn, implies that the statistics on your objects, the statistics on your system, your optimizer parameters, your session's optimizer settings or some other variable is incorrect. You're generally better off fixing the root problem than hinting every query.
In this specific case, the parallel hint is invalid because there is no table aliased A. The full hint is invalid for similar reasons. Plus, with the query you provided, if A was intended to be the SALARY table, it seems exceptionally unlikely that you really want to do a full scan on the salary table to look for what had better be a single row (otherwise your query would throw a "too many rows returned" exception).
Justin

Using temporary tablespace for sort in select statement without spacifying

how can i use some particular temporary tablespace in select statement for sording without allocating any temporary tablespace to that user

Try to set for the current session the in memory sorting space to 0 before running your query:
SQL> alter session set sort_area_size = 0;The query should use the temporary tablespace.
Message was edited by:
Pierre Forstmann

How to generate mutiple Results for multiple SQL SELECT statements

I just downloaded SQL Developer 1.5 and play around with it.
On a daily basis, I need run 4 different SELECT statements and dump the output of each SELECT into an CSV file and send to some users. In SQL Navigator, I can select all 4 SELECT statements and execute them at same time. Once all complete, I will see 4 tabs, each represent the output for each SELECT statement. Then I can export output from each tab into a CSV file.
It seems that SQL Developer 1.5 still can't run mutiple SELECT statements and display the output of each statement into a separate "Results" tab so that I can export the data into multiple CSV files easily.
Right now, I have to hightlight each SELECT statement and press F9, then export the output data into CSV.
I wish I can execute 4 SELECT statements all in once on SQL Developer and get all the output data and export 4 times into 4 CSV files.
Thanks!
Kevin

How about doing it as a set of tabs within the Resuls Tab?
So you would have your Top row of tabs:
Results, Script Output, Explain, AutoTrace, DBMS Output and OWA Output
Then When you have the Results tab selected you could have a row of tabs beneath the Top row with one tab for each result set. Switching between result sets should switch which section of SQL is highlighted as the "Current SQL".
A similar mechinism could be employed for each of the top level tabs where it makes sense to have multiple output tabs.
A further refinement of this feature might be to allow the result tabs to be dockable within the parent tab so that multiple result tabs can be viewed simultaneously. This way 2 or more explain plans (for example) could be visually compared without requiring the code to exist in two separate code panes.

ITunes opens explorer window when searching for updates or selecting restore for any iOS device.

When trying to check for updates from within iTunes for any device, or trying to restore a device in iTunes I click the update/restore button and iTunes opens an explorer window for me to browse to the .ipsw file. I am unable to get iTunes to check the Apple servers for the restore/update files.
Where is this setting stored either in the registry or the iTunes folder?
I have performed a clean uninstall (http://support.apple.com/kb/HT1923) , have removed my apple preferences that were stored in the AppData folders for each user and have reinstalled and still see the explorer box rather than the check apple for updates dialogue.
I have a feeling that the particular setting is somewhere in either the itunes library folder, in the registry or in another plist file... but where is the question?

Have you had any luck in resolving this issue? Seems Apple are a bit quiet on it...

Update From Select statement

I'm very new to Oracle so please bear with me.
I need to Update a table ( T1) with dates selected from another table (T2). However, because of the size of the tables (the second one has upwards of 3,000,000 rows) I have to do it incrementally, say 10k rows at a time. However, there's no field in T1 that I can use as a flag to say the row's been updated. But I do have an ascending numeric field that I can do a Max() function on. My thought was to capture the max numeric function in local variable and use it in a where clause so I only get the rows I need to update. Pseudo-ish code follows:
DECLARE
mDoc NUMBER
maxNum NUMBER
BEGIN
mDoc = 0;
SELECT MAX(doc_id_n) INTO maxNum FROM T2;
WHILE NOT mDoc > maxNum
LOOP
SELECT MAX(doc_id_n) INTO mDoc FROM T2
WHERE doc_id_n > mDoc AND rownum < 10001;
UPDATE T1 SET scan_d =
(select to_date(t.ddate,'MM/DD/YYYY') as ndate
from T2 t, T1 i
where i.stor_rep_id = 'HRPAYROLL1' and
t.doc_id_n = i.doc_id_n and rownum < 10001
AND NOT t.doc_id_n > mDoc
ORDER BY t.doc_id_n)
END LOOP;
END;

You say:
<However, there's no field in T1 that I can use as a flag to say the row's been updated.
That's fine, you needn't nor might you want to do this incrementally. Instead, what basis or values in table(T1) are you using to determine which rows are updated? For example, you might want to use a particular field as your 'filter' between the two tables. Still it's not fun :)
UPDATE T1 SET date_column = (SELECT inserted_date FROM T2 WHERE customer = 'ABC')
WHERE customer = 'ABC';
UPDATE T1 SET date_column = (SELECT inserted_date FROM T2 WHERE customer = 'XYZ')
WHERE customer = 'XYZ';
Hope this helps.

Problem with "SELECT...FOR UPDATE OF..." and "POST command" combination

Problem with "SELECT...FOR UPDATE OF..." and "POST command" combination
Problem in committing transactions in Multiple Forms (Oracle Forms) with POST built-in command:
Consider that the following statements are written in WHEN-WINDOW-CLOSED trigger of a called form.
Statements in called form (Form name: FORM_CHILD):
go_block('display_block') ;
do_key('execute_query') ;
-- Data from table_b will be populated in this block, based on the value of COLUMN_1 obtained
-- from TABLE_A.
-- Example: If the value of COLUMN_1 is 10, then all the matching records from TABLE_B, which
-- are inserted with value 10 in TABLE_B.COLUMN_1 will be fetched and shown here.
if user_choice = 'YES' then
commit ;
else
rollback ;
end if ;
Statements in calling forms:
There are two calling forms having following statements and it is going to call the above said called form.
CALLING FORM 1
Statements in KEY-COMMIT trigger:
post;
call_form(form_child, no_activate) ;
Statements in ON-INSERT trigger:
select column_1
from table_a
for update of column_1
where column_2 = 'X' ;
update table_a
set column_1 = column_1 + 1
where column_2 = 'X' ;
insert into table_b ...;
insert into table_b ...; Statements in KEY-COMMIT trigger:
post;
call_form(form_child, no_activate) ;
CALLING FORM 2:
Statements in ON-INSERT trigger:
select column_1
from table_a
for update of column_1
where column_2 = 'X' ;
update table_a
set column_1 = column_1 + 1
where column_2 = 'X' ;
insert into table_b ...;
insert into table_b ...;
insert into table_b ...;
Our understanding:
Assume that both the forms are running from two different machines/instances, issuing commit at the same time. In this case, forms will start executing the statements written in ON-INSERT trigger, the moment POST command is executed. Though the commit is issued at the same time, according to oracle, only one of the request will be taken for processing first. Assume that calling form 1 is getting processed first.
So, it fetches the value available in COLUMN_1 of TABLE_A and locks the row from further select, update, etc. as SELECT...FOR UPDATE command is used (note that NOWAIT is not given, hence the lock will be released only when COMMIT or ROLLBACK happens) and proceed executing further INSERT statements. Because of the lock provided by the SELECT...FOR UPDATE command, the statements in calling form 2 will wait for the resource.
After executing the INSERT statements, the FORM_CHILD is called. The rows inserted in to TABLE_A will be queried and shown. The database changes will be committed when user closes the window (as COMMIT is issued in its WHEN-WINDOW-CLOSED trigger). Then the SELECT...FOR UPDATE lock will be released and calling form 2's statements will be executed.
Actual happenings or Mis-behavior:
Calling form 2 starts executing INSERT statements instead of waiting for SELECT...FOR UPDATE lock. Also, the value selected from TABLE_A.COLUMN_1 is same in both the calling forms, which is wrong.
The rows inserted into TABLE_B are having similar COLUMN_1 values in calling form 2 and they are fetched and shown in the called form FORM_CHILD.
Note that in calling form 2 also POST only is issued, but the changes posted there are accessible in calling form 1 also, which is wrong.
Kindly suggest us as to how to fix above problem. It will be much use, if you can send us the information regarding the behavior of Oracle Forms POST built-in also.
Our mail ID: [email protected]
Thanks a lot in advance.

You have several problems:
1. On-Insert will ONLY run if you have created a new record in a base-table block. If you haven't done that, then the POST command will not cause it to run.
2. Select for update without a "no wait" will lock records for the first form, but when the second form tries this, it will hit the ORA-00054 exception, and will NOT wait. The only way you could make it wait is to issue an UPDATE sql command, which is not such a good way to go.
All POST does is issues SQL insert or update commands for any changes the user has made to records in a form's base-table blocks, without following with a Commit command.
Also understand that Commit is the same as Commit_Form, and Rollback is the same as Clear_Form. You should read up on these in the Forms help topics.

Select for update timing out

Hi there
when I do a simple select statement like
select * from table
I recieve all the records without a problem
when I add 'for update' like
select * from table for update
this seems to take a long time (I don't actually get a result)
Is there something I'm doing wrong or have I incorrectly set up my oracle server?

As you are saying that your normal query is running fine but if you are using query with for update of it takes more time than previous.
But it is normal behaviour of the oracle itself, when you use for update of, oracle put lock on selected row and then dont allow other users to access it unless and untill first user finish the desired task on selected row. It creates delay in response of your for update query.
null

Getting ROWID without using "FOR UPDATE" in statement

Hi,
Is there any way to get the ROWID of the current record without using "FOR UPDATE" in the statement?
Here's the story...
I'm actually working on a server that receives multiple connections from client applications. The server interacts with OCI for selecting, updating, fetching and so on. The server is able to manage many opened recordset from clients.
Here's a possible scenario:
- A client asks the server to open a recordset ie: "SELECT * FROM foo".
- Then, the server receives a command to position the cursor on the last record ie: "OCIFetch2->LAST".
- Finally, the client decides to update the current (last) record.
Since the server can receive other requests such as opening a new recordset from another client, I can't use "SELECT * FROM foo FOR UPDATE" because it blocks further call to OCIStmtExecute (even in NONBLOCKING mode).
At the same time, I can't COMMIT the transaction after the "SELECT" statement otherwise the selection gets invalidated. The selection needs to remain valid until the client decides to "close the recordset".
Is there any workaround?
Any help would be appreciated!
Thanks,
Jonathan Primeau
Software Engineer
Integration New Media, inc.

Hi again,
I found that OCIRowidToChar could save my life. In fact, by retrieving the ROWID equivalent string I could use it to build a statement like:
update foo set c1 = 1 where rowid = 'AAAHZuAABAAAMViAAL';
which will solve my problem since these strings don't change and represents a unique record.
The problem is when I try to compile this method it says:
test.cpp: In function `sword OpenRecordset(OCIServer*&, OCISvcCtx*&, OCIStmt*&,
COLDEF*)':
test.cpp:382: `OCIRowidToChar' undeclared (first use this function)
test.cpp:382: (Each undeclared identifier is reported only once for each
function it appears in.)
make: *** [test] Error 1
It seems that this function is not declared under Solaris/Oracle 9i. I searched on the web and there is not much information about that. However, it is documented in the Oracle book.
Is there any way to use this function under Solaris? If not, how can I get the string that represents a ROWID?
I use the following syntax:
sword OCIRowidToChar ( OCIRowid *rowidDesc,
OraText *outbfp,
ub2 *outbflp
OCIError *errhp );
Best regards,
Jonathan
Software Engineer
Integration New Media, inc.

Need to wite pl sql procedure for dynamic select statement

Need pl sql procedure for a Dynamic select statement which will drop tables older than 45 days
select 'Drop table'||' ' ||STG_TBL_NAME||'_DTL_STG;' from IG_SESSION_LOG where substr(DTTM_STAMP, 1, 9) < current_date - 45 and INTF_STATUS=0 order by DTTM_STAMP desc;

I used this to subtract any data older than 2 years, adjustments can be made so that it fits for forty five days, you can see how I changed it from the originaln dd-mon-yyyy to a "monyy", this way it doesn't become confused with the Static data in the in Oracle, and call back to the previous year when unnecessary:
TO_NUMBER(TO_CHAR(A.MV_DATE,'YYMM')) >= TO_NUMBER(TO_CHAR(SYSDATE - 365, 'YYMM'))

FOR UPDATE NOWAIT Fails to Detect Lock

Locking a bitmap indexed row would cause other rows locked. I heard that, if FOR UPDATE NOWAIT is used on these accidentally locked rows (Oracle SQL High Performance Turning by Prentice hall), it may not be able to detect the lock. Is it true? I cannot find related documenation from Oracle's manual. And, what should we do to prevent an incorrect lock status returned by FOR UPDATE NOWAIT?

SELECT FOR UPDATE NOWAIT detects locks affected DATA blocks.
Look the example below:
SQL> create table t1 (id number, bit_col number);
Table created.
SQL> begin
2 insert into t1 values(0,1);
3 insert into t1 values(1,1);
4 insert into t1 values(2,2);
5 insert into t1 values(3,3);
6 insert into t1 values(4,4);
7 end;
8 /
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
SQL> create bitmap index t1_bit on t1(bit_col);
Index created.Now in session 1 we change the bitmap-indexed column and it affects
index node:
SQL> update t1
2 set bit_col = 4
3 where id = 2;
1 row updated.In accordance to bitmap index structure this operator locks the index section
the locked row pertains to:
2th session waits for the lock release even when it tries to lock another row -
two rows pertain to the same index section which is locked by the first session:
SQL> update t1
2 set bit_col = 2
3 where id = 3;After rollback in the first session the second one gets the resource:
SQL> update t1
2 set bit_col = 2
3 where id = 3;
1 row updated.Now lets do rollback in both and repeate the first UPDATE in the first session:
SQL> update t1
2 set bit_col = 4
3 where id = 2;
1 row updated.In the second session we can lock the row (not index section) using
SELECT FOR UPDATE:(in contrast with UPDATE statement which changes
indexed column):
SQL> select * from t1 where id=3 for update nowait;
ID BIT_COL
3 3But certainly we detect row-level lock in the data block for ID = 2:
SQL> select * from t1 where id=2 for update nowait;
select * from t1 where id=2 for update nowait
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specifiedRgds.

Working with FOR UPDATE

Hi,
i have 2 session(A, B) and trying to execute sql statement with For update clause
Session A
select * from emp where empid in (10) for update nowait;
Session B
select * from emp where empid in (10, 20) for update nowait;
my question is after executing select statement in sessin B will oracle locks
empid =20 or it will ignore the lock as part of it (empid=10) is already locked by
session A.
Can anyone plz help me in this..
Rds,
Naga

Why not try it out?:
Session A:
SQL> select empno,ename from emp where empno in (7788) for update nowait;
     EMPNO ENAME
      7788 SCOTTSession B:
SQL> select * from emp where empno in (7788,7900) for update nowait;
select * from emp where empno in (7788,7900) for update nowait
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specifiedSesson A again:
SQL> select empno,ename from emp where empno in (7900) for update nowait;
     EMPNO ENAME
      7900 JAMES

Selected state issue with Menu Module V2

OK so I am getting an issue with Menu Module V2. I have used this before with success but this time I have hit a wall. I possed this question to BC live chat and they bugged out real quick.
The site in construction is http://www.urbanista.com.au
What is happening is that in the top right tools nav with the headings Home, Services, People, Contact Us using Menu Module V2. The Heading Services has a drop down and this is where the issue resides. Roll over any of these nav devices and you will see they will highlight orange. Home is already auto activating its Selcted state. Click on Contact Us and it will do the same. Roll over and click on Services and it appears to have worked. While in Services roll over the drop down again and you will see all links have activated the Selected state. This is the issue. If you view the code of the Services UL you will see only the Services state has been alocated the Slected state. See below:
<li id="Services" class="selected">
<a href="/services.htm">Services</a>
<ul>
<li id="tools-panningdev">
<li id="tools-housing">
<li id="tools-urban-renewal">
<li id="tools-project-management">
<li id="tools-feasibility-tools">
<li id="tools-governance-systems">
<li id="tools-communications">
<li id="tools-projects">
</ul>
</li>
The CSS that runs the nav is as follows:
ul.dropdown {
    font-weight: normal;
    font-family: Arial, Helvetica, sans-serif;
    font-style: normal;
    text-decoration: none;
    ul.dropdown li {
    background-color: transparent;
    color: #999;
    padding-top: 5px;
    padding-right: 10px;
    padding-bottom: 5px;
    padding-left: 10px;
    font-size: 12px;
    ul.dropdown li.hover,
    ul.dropdown li:hover {
    background-color: transparent;
    color: #FFF;
    ul.dropdown a:link,
    ul.dropdown a:visited    {
    color: #FFF;
    text-decoration: none;
    ul.dropdown a:hover        { color: #ff871f; }
    ul.dropdown a:active    {
    color: #b33b00;
    /* -- level mark -- */
    ul.dropdown ul {
    width: 150px;
    margin-top: 1px;
    background-image: url(/images/nav-transparency.png);
    background-repeat: repeat;
    color: #FFF;
    ul.dropdown ul li {
    font-weight: normal;
ul.dropdown li.selected a {
    color: #ff871f;
The last entry 'ul.dropdown li.selected a {color: #ff871f;}' is required in order to allocate a Slected State. Without it not Selected state is active and the links al remian white.
I have tried all manner of combinations and additonal tags with no success. Any suggestions greatly appreciated. I have not modified the default Javascript provided by BC in the system apart from allocating the required ulTagClass as specified. The Javascript in the supplied 'container.html' is as follows:
<script type="text/javascript" >
    // ids need to be unique per page, use different ones if you are including multiple menus in the same page
    // id of the nav tag, used above
    var divTagId = "myMenu1";
    // desired id for 1st <ul> tag
    var ulTagId = "myMenu1List";
    // desired class for 1st <ul> tag
    var ulTagClass = "dropdown dropdown-vertical";
    if ((null !== ulTagId) && ("" !== ulTagId)) {
        document.getElementById(divTagId).getElementsByTagName("ul")[0].setAttribute("id",ulTagId );
    if ((null !== ulTagClass) && ("" !== ulTagClass)) {
        document.getElementById(divTagId).getElementsByTagName("ul")[0].className = ulTagClass;
    // this will set the selected state
    if ((null !== ulTagId) && ("" !== ulTagId)) {
        catSetSelectedCSSItem(ulTagId);
</script>
Lastly this is one of the recomended navs by BC at the following address: http://lwis.net/free-css-drop-down-menu/
I have used these before with success but for the life of me this has stumped me big time.

Hi Matthew,
Having a super quick look at the code I'd say it's because of:
ul.dropdown li.selected a {
    color: #ff871f;
This affects all the child elements.
To override this down the line you could do something like:
ul.dropdown li.selected ul li a {
    color: #fff;
This would override the parent link color when selected.
You could probably then also add:
ul.dropdown li.selected ul li.selected a {
    color: #ff871f;
For the dropdown selected states.
That's a quick look though so don't quote me too much

Provide alternative select statements to improve performance

Hi Frnds
I want to improve the performance of my report. below statement is taking more time. Please provide any suggestions to include alternative statement for the below select statement.
SELECT H~CLMNO H~PNGUID P~PVGUID V~PNGUID AS V_PNGUID
           V~AKTIV V~KNUMV P~POSNR V~KATEG AS ALTNUM   V~VERSN
         APPENDING CORRESPONDING FIELDS OF TABLE EX_WTYKEY_T
         FROM ( ( PNWTYH AS H
           INNER JOIN PNWTYV AS V ON V~HEADER_GUID   = H~PNGUID )
           INNER JOIN PVWTY AS P ON P~VERSION_GUID = V~PNGUID )
         FOR ALL ENTRIES IN lt_claim
        WHERE H~PNGUID = lt_claim-pnguid
           AND V~AKTIV IN rt_AKTIV
           AND V~KATEG IN IM_ALTNUM_T.
Thanks
Amminesh.
Moderator message - Moved to the correct forum
Edited by: Rob Burbank on May 14, 2009 11:00 AM

Hi,
Copy the internal table lt_claim contents to another temp internal table.
lt_claim_temp[] = lt_claim[].
sort lt_claim_temp by pnguid.
delete adjacent duplicates from lt_claim_temp comparing pnguid.
SELECT HCLMNO HPNGUID PPVGUID VPNGUID AS V_PNGUID
           VAKTIV VKNUMV PPOSNR VKATEG AS ALTNUM   V~VERSN
         APPENDING CORRESPONDING FIELDS OF TABLE EX_WTYKEY_T
         FROM ( ( PNWTYH AS H
           INNER JOIN PNWTYV AS V ON VHEADER_GUID   = HPNGUID )
           INNER JOIN PVWTY AS P ON PVERSION_GUID = VPNGUID )
         FOR ALL ENTRIES IN lt_claim_temp
        WHERE H~PNGUID = lt_claim-pnguid
           AND V~AKTIV IN rt_AKTIV
           AND V~KATEG IN IM_ALTNUM_T.
refresh lt_claim_temp.

For update in select statement

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