Why many sessions with alter session statements?

Currently we are using Oracle 8.1.7 on Tru64Unix and connect with this database via OC4J904. We find many inactive sessions indicated with the SQL statement:
ALTER SESSION SET NLS_LANGUAGE = 'AMERICAN'
But nobody explicitly issues this statement. How does this occur?

What is your NLS_DATABASE_PARAMETER 'NLS_LANGUAGE'?
For example:
SQL> SELECT * FROM NLS_DATABASE_PARAMETERS
2 WHERE PARAMETER = 'NLS_LANGUAGE';
PARAMETER VALUE
NLS_LANGUAGE AMERICAN
What is the value of the environment variable 'NLS_LANG' for your session?
On my computer it is:
AMERICAN_AMERICA.WE8MSWIN1252
You can find some useful information here:
http://download-west.oracle.com/docs/cd/B13789_01/server.101/b10749/ch3globe.htm#1006332

Similar Messages

Trouble setting the session state of a select item.

Hi,
I have a requirement whereby I need to change the session state of a select list item in my form without the need to submit. I am using Application Express 4.1.0.00.32. I thought this would be straight forward using a dynamic action or javascript and calling an on demand process for example.
P1_MY_SELECT onchange="set_option();"
function set_option() {
var l_option=$f_SelectValue('P1_MY_SELECT');
alert( 'My new value is ' + l_option );
// ON DEMAND Set the new session state value
var lRequest = new apex.ajax.ondemand
('SET_P1_MY_SELECT',function()
{ /* start the return function */
var l_s = p.readyState;
if(l_s == 1||l_s == 2||l_s == 3)
else if(l_s == 4)
{ gReturn = p.responseText;
(gReturn)?json_SetItems(gReturn):null;
else{return false;}
/* end the return function */
lRequest.ajax.addParam('x01', l_option );
lRequest._get()
My on demand application process
DECLARE
l_options varchar2(2000) := wwv_flow.g_x01;
BEGIN
APEX_UTIL.SET_SESSION_STATE('P1_MY_SELECT',l_options);
apex_util.json_from_items('P1_MY_SELECT');
END;
Is there a better method to set the session state of my P1_MY_SELECT other than what I am doing as above or can you tell me why the session state of P1_MY_SELECT is not changed?
Thanks.
Edited by: 968358 on 01-Nov-2012 08:40

if you are on 4.1 why don't you use a dynamic action instead of writing the code again?
create a dynamic action like this
Event: Change
Source Type: Item
Item: P1_MY_SELECT
True Action:
=========
Action: Execute Plsql Code
Plsql Code: null;
Page Items to Submit: P1_MY_SELECT
Page Items to Return: P1_MY_SELECT (this is optional)
http://docs.oracle.com/cd/E23903_01/doc/doc.41/e21674/advnc_dynamic_actions.htm#HTMDB27020

Problem with application item and session state

Okay, let's see if I can explain this problem coherently.
I have a small app (one page), with an application item, F_WHERE_CLAUSE.
This page has three regions in which there are items that the users can populate for search conditions. A couple of these items are "select list with submit" (I still need to upgrade to the AJAX method, I know). There is another region which has one hidden field, called P1_WHERE_CLAUSE. This field is defined to "Always, replacing any value in session state..." with source type of "Item (application or page.....", and a source value of F_WHERE_CLAUSE with no default value.
I have a button called "Search" which submits the page and fires a PL/SQL process which builds a where condition based upon the other page items and stores the value to the application item F_WHERE_CLAUSE (correctly).
For testing, I've made the P1_WHERE_CLAUSE field visible so that I can see what's going on. I've also clicked the debug and session buttons to help trace this. After I click the "Search" button and the page submits, debug shows:
0.02: ...Session State: Save "P1_WHERE_CLAUSE" - saving same value: "1=1"
followed later by:
0.05: ...Session State: Saved Item "F_WHERE_CLAUSE" New Value="lower(primary_class) = 'rock' and country = 'Spain'"
The field P1_WHERE_CLAUSE displays with the correct search criteria as signified by F_WHERE_CLAUSE above. However, If I click the "session" button to view the session state values, P1_WHERE_CLAUSE shows up as:
P1_WHERE_CLAUSE Textarea 1=1 U while F_WHERE_CLAUSE displays the correct value still.
The reason this "problem" came up, is that this page also has three SQL report regions which use &P1_WHERE_CLAUSE. for the where condition. While they display the correct results on-screen, each report region also has the "Export to csv" enabled, and the export seems to be using the "1=1" condition (from the "session" window) instead of the search criteria that the on-screen region is using (F_WHERE_CLAUSE and the displayed P1_WHERE_CLAUSE), resulting in a retreival of all records.
Anybody have any idea what's going on and why, and how to get the csv export to use the correct value for the where condition?
Thanks,
Bill Ferguson

It appears the "Export to CSV" functionality requires the item value to be set in session state. The P1_WHERE_CLAUSE item value never gets saved to session state. The page is rendered and the value is put in the item on the page but until you submit the page session state doesn't know what P1_WHERE_CLAUSE is.
Create a before header computation or process to set the value of P1_WHERE_CLAUSE (which will save it to session state). It is interesting that the report regions didn't need to look at the value in session state but the "export to csv" does.
--Jeff

Apex bug? Items being cleared in session state - can't figure out why

I have an item that is being submitted with a value but is then being overwritten and set to null. I can't see any reason why the submitted value is being overwritten with null.
I have been debugging this problem for most of the day and can't figure out what is happening and was hoping someone in the forum might be able to shed some light.
Some details:
The item is on Page 0, has source type of "PL/SQL Expression or Function", a source expression of "V('REQUEST')", and Source Used = "Always".
I viewed the HTML source of the rendered page and can see the following HTML, so I know the item has a value when the page is rendered:
<input type="hidden" id="RENDER_REQUEST" name="p_t08" value="EDIT" />
I have used Firebug to view the HTTP POST body and can see that p_t08 is being correctly submitted with a value of "EDIT" in the post body.
When I run the page in debug mode and then view the debug log, I see that Apex is indeed setting this item to null:
     0.01500     0.01600     A C C E P T: Request="WIZ_NEXT"
     0.23400     0.00000     Session State: Save form items and p_arg_values
     0.24900     0.01600     ...Session State: Save "BRANCH_TO_PAGE_ID" - saving same value: ""
     0.24900     0.00000     ...Session State: Save "ROWS_PER_PAGE" - saving same value: ""
     0.26500     0.01500     ...Session State: Save "P0_CLEAR_WS" - saving same value: ""
     0.26500     0.00000     ...Session State: Saved Item "RENDER_REQUEST" New Value=""
I can't figure out why the item is being set to null.
This problem also does not occur on every page. The pages in question are a multi-step "wizard" that allows the user to navigate between steps with "Next" and "Previous" buttons. Since this is a page 0 item, it appears on every page in the wizard so I'd expect it to behave the same. When you open the wizard at step 1 and press next to go to step 2, the item (RENDER_REQUEST) is set correctly on step 2 of the wizard, BUT when you then click Next to go to step 3, RENDER_REQUEST is null on step 3. If you open the wizard at step 2 and press Next, RENDER_REQUEST is null on step 3.
I did find a work around, but it doesn't make any sense why it would work: if I move the RENDER_REQUEST item from the "Footer Items" region to a page level item (by using Edit All and setting its region to blank), then the problem goes away. If I move it back to the "Footer Items" region the problem reoccurs.
I am working on Application Express 4.0.2.00.07 on Oracle Database 11g Enterprise Edition Release 11.2.0.1.0.
Any help would be greatly appreciated!
Thank you.

Hi Patrick,
Thanks for the quick response. Unfortunately, I can't reproduce this on apex.oracle.com due because the app requires PL/SQL packages to be installed in several schemas, including some that require system grants (I gave a presentation at Oracle Open World a couple of years ago on some of the techniques I used in building this application that you attended; I think the session was called "Building Large Commercial Applications with Oracle Database 11g and Oracle Application Express").
Is there another way we can work together to debug this without reproducing it apex.oracle.com? For example, if you could send me an instrumented version of the APEX_040000.F procedure (or whatever procedure is clearing the session state) that has some additional APEX_APPLICATION.DEBUG calls, I could install it on my server, reproduce the error and send you the output.
Thank you,
Eric

Many sessions simultaneously executing a sql statement ?

Hi gurus,
I'm on a sittuation which affect to system performance. When i monitor current activities, i notice that many session is executing the same sql statement.
SPID     SQL_ID
16133     5ptuft7h7y8jk
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
21385     9yayt7t5wsv07
It's up to 70-80 session executing one same sql. Is there any idea or suggest for this my case.
So thanks
Ch

You could look at the SQL (from V$SQLSTATS, V$SQL or V$SQLAREA) and then determine what it is doing and then get some clues as to why one database has multiple executions of the SQL . Most developer leads would be able to say "ah ... this SQL is executed by this module in this part of the application when the user chooses this option". Then you figure out why you have multiple users choosing the option.
OR there could be dependencies between different statements or enqueue waits -- and multiple sessions waiting on the same lock !
Hemant K Chitale

How to tell if a user is issuing 'alter session statements'

When I run 'alter session' from sqlplus in my schema, this does not get parsed and go to v$sql or show up in v$open_cursor. I have a user that is running queries from informatica. He says he is passing alter session statements through informatica, I want to see if they actually get there. The person is not real versed in oracle and I don't know informatica.
i cant turn on trace cause he connects and disconnects and this would run immediately, I am not in a position to turn on system level tracing, add a trigger, or turn on auditing (not allowed).
anyway to tell from a data dictionary view or something like that if these were issued by a given session? The queries run for a few minutes, so I have a bit before his session disconnects to query the data. I can't get him to change his code to stay connected. Is there a view that shows parameter changes for a given session?
oracle: 10.2.0.5
4 alter session commands are:
Alter session set sort_area_size=999999999;
Alter session set hash_area_size=999999999;
Alter session set db_file_multiblock_read_count = 128;
alter session enable parallel dml;
Edited by: Guess2 on Jul 17, 2012 12:49 PM

i cant turn on trace cause he connects and disconnects and this would run immediately, I am not in a position to turn on system level tracing, add a trigger, or turn on auditing (not allowed). If Informatica connects to Oracle via network, capturing TCP/IP traffic and mining in it may be your last resort.
you can get session's PDML status from
select pdml_status from v$session;
i cant turn on trace cause he connects and disconnects and this would run immediatelythis contradicts to your following statement
The queries run for a few minutes, so I have a bit before his session disconnects to query the data.
I can't get him to change his code to stay connected. Informatica should have debug. Ask him if he can go step by step.
Edited by: user11181920 on Jul 17, 2012 5:53 PM

Need help with the session state value items.

I need help with the session state value items.
Trigger is created (on After delete, insert action) on table A.
When insert in table B at least one row, then trigger update value to 'Y'
in table A.
When delete all rows from a table B,, then trigger update value to 'N'
in table A.
In detail report changes are visible, but the trigger replacement value is not set in session value.
How can I implement this?

You'll have to create a process which runs after your database update process that does a query and loads the result into your page item.
For example
SELECT YN_COLUMN
FROM My_TABLE
INTO My_Page_Item
WHERE Key_value = My_Page_Item_Holding_Key_ValueThe DML process will only return key values after updating, such as an ID primary key updated by a sequence in a trigger.
If the value is showing in a report, make sure the report refreshes on reload of the page.
Edited by: Bob37 on Dec 6, 2011 10:36 AM

Set Session State with Shuttle items

Is it possible to have session state set with each item selected in a shuttle? You have a shuttle with 4 possible options, you select item 2 from the left portion of shuttle and it is moved to the right.. Can you set the session state at that point?
What I am trying to do is take the session state after change in the control and use it to populate a text field below. The returned values are used in a sql select to populate the text box with a looked up value...
Thank you,
Tony Miller
Ruckersville, VA

TexasApexDeveloper wrote:
Won't this just push the last items value in, as apposed to appending the value?
Tony,
No. Because for shuttle items the return value is stored as colon delimited string.
Means after each change you will have a colon delimited string in the session state with selected values(moved to right).
See this http://apex.oracle.com/pls/apex/f?p=46417:47

Insufficient privileges when creating MV with alter session set current_sch

I am getting Insufficient privileges when creating MV with alter session set current_schema=Application schema name. User running the alter session is DBA user. If run as SYSDBA, MV is created successfully. DB Version is 10.2.0.3
I observed similiar issue with regular View also in 9.2.0.6 also.
Any advice is greatly appreciated.
Thanks,
Siva

Sounds like your management needs a stern lecture on the concept of change management. <g>
I am not debating what you do. I am questioning the logic, or lack thereof, of doing it that way. My recommendation would be to change your procedure to one that:
A. Is more in line with good change management practices.
B. Works.

Compare Old Value (Session State) with New Value on Submit.

Hi all,
Is there an easy way to do comparison of Old Value (Session State Value) with the New Value?
is there an API for that? like what we have in PLSQL Trigger :NEW & :OLD
Thanks before
-Joel

There is only one version of session state available for examination at any point during page rendering or processing, the current version. Can you explain more about what you need?
Scott

Problems With Session State Protection

I have enables SSP on one of my applications and everyting seemed ok until I reached a page with a custom pop up page.
I use this code in my page header
{} used to display code
{<script language="JavaScript1.1" type="text/javascript">
function callMyPopupRank (formItem1,formItem2) {
var formVal1 = document.getElementById(formItem1).value;
var formVal2 = document.getElementById(formItem2).value;
var url;
url = 'f?p=&APP_ID.:115:&APP_SESSION.::::P115_RANK,P115_RANK_ID:' + formVal1;
w = open(url,"winLov","Scrollbars=1,resizable=1,width=400,height=630");
if (w.opener == null)
w.opener = self;
w.focus();
</script>}
Then I call it from post element text of an item
{<img src="#IMAGE_PREFIX#edit-white.gif" border="0" alt="Edit">}
When my pop up page opens I get this error
Attempt to save item P115_RANK in session state during show processing.
Item protection level indicates "Item may be set when accompanied by a "session" checksum.".
No checksum was passed in or the checksum passed in would be suitable for an
item with protection level "(No checksum was provided)".
How do I append the checksum to my url ?
Thanks
Gus
Edited by: Gus C on Jan 8, 2010 1:50 AM
Edited by: Gus C on Jan 8, 2010 1:52 AM

You will need to use the APEX_UTIL.PREPARE_URL function to append the checksum to the URL. I would suggest you use a hidden page item to hold the URL and then reference it in your JS.
I hope that helps
Shunt

Submitting the value of an item with session state

Hi,
I've a Master / Detail Form on different pages, like master report page no.19, master form page no. 20 and detail form page no. 21. I've created this form using Form, master detail form wizard. I've set deptid as a primary key in master, and foreign key in details table. In page 21, i've set the source for deptid, source used : Always, replacing any existing value in session state, source type : Item (application or page item name), source value : P20_DEPTID. While executing the form deptid is showing the value, but, while submitting of the form, it's not saving in the table. What will be the problem??
Thanks and Regards,
Sudha.

Sudha,
OK.
Go to the pagedefintion in page 20, click on the wordt report (of your master form).
You will get a new screen.
Click on the pencil-icon of your column.
Again a new screen.
Select the six tab (it's called LINK).
Enter item-name and value something like :p21_dept_id and #DEPT_ID#
where P21_dept_id is the item of the form for the dept_id
Hope this helps.
Leo

Need help with session state/item refresh

I have an application that allows users to record productivity information for our employees. There are different types of work they have to do, so the form is in header/multiple-detail form and uses collections to handle all processing. In the header portion are the fields that record the time of work. Though this is stored in the database as a single field for start of shift and single field for end of shift, in the entry it is split up into 9 fields: 3 for day, month, and year, and three more each for start hours, start minutes, AM/PM, end hours, end minutes, and AM/PM, which I then concatenate to get the dates to store. The update part works fine. When I go in to display each of these, I have to use an SQL query to retrieve only that section of the time.
The problem I am having is that if the user pulls up several timecards to edit them, it retains these time values from the previous timecard, and due to the way the collections refresh, I can't seem to get either item session state parameter (Only when Null/Always from Source) to achieve the desired result. If I use the Only When Null option, I retain the values from the previous timecard. If I use the Always from Source, the user can't update any of the time-related input.
Can anyone suggest a solution? I've tried a session state process that fires on entry to clear those items and ran into the same problem as using the Always From Source option. There has got to be a way to handle this, but it's got me stumped and my users are clamoring for a fix.
Page initial load
A. Before Header process populates job collection and other collection (not header info), which comes straight from DB table.
B. Data displays for Header (from table) and two detail sections (from collections)
User presses Submit to save changes
1. On Submit Before Processing: updates job and other collections (to preserve changes in case validation fails)
2. Validations check to make sure job codes are valid, date is valid, employee is valid, etc.
3. On Submit After Processing: Writes changes to header from input form, writes changes to job and other from collections to appropriate DB tables
I also have two On Submit After Processing processes to add blank lines - one for each collection. These are triggered via buttons.

Blair:
Does creating a 'before header' process to populate these fields make a difference ? The sql could be something like
select TO_CHAR(TC_START_TIME,'HH') into :P1115_TIME_IN_HH from TC where TC_ID = :P1115_TC_ID;You should set the 'Source Used' back to 'Only when current value in session is null' and the 'Source Type' to 'Static Assignment(....)' and clear out the 'Source value or expression' field.
varad

How can a session have an ACTIVE status with a WAITING state

Hi all,
I would like to know the difference between status and state of a session ?
The documentation says :
for status ACTIVE : Session currently executing SQL
for state WAITING : The session is currently waiting...
How can a session execute a SQL statement and be waiting at the same time ?
Regards,
fcjunic.

Hi fcjunic,
It's really not paradoxical, once you understand the definition of the terms.
First, we have V$SESSION.STATUS, which can be ACTIVE or INACTIVE. A session is ACTIVE if it's in a database call. So, think of this from the client side point of view. A session does a parse call, or an execute call, or a fetch call, etc. For the duration of that call, till control returns back to the client, that session is said to be ACTIVE.
From the time the calls returns, till the time of the next call, the session is INACTIVE.
Next, we have V$SESSION.STATE. This is probably more useful to think of from the server process point of view. This refers to whether the server process is currently running, i.e. on the CPU, or WAITING, i.e., waiting on a resource. Possible values for this column are WAITING, WAITED KNOWN TIME, WAITED SHORT TIME, and WAITED UNKNOWN TIME. Of those possibilities, a session is only actually waiting if STATE is WAITING. All the other values mean that it's no longer waiting, but is running on CPU.
A session w/ STATUS of INACTIVE, will always be in STATE of WAITING, waiting on the 'SQL*NET message from client' wait. So, in that case, it means the server process is waiting around for work to do. It's in between calls, so, STATUS is INACTIVE, and it's waiting on that network port, to receive the next call from the client.
An example of a session that's ACTIVE and has STATE of WAITING, would be a session that's, for example, doing a full table scan. So, it's got lots of data to read from disk. While the session waits for the read from disk to complete, the session waits on 'db file scattered read'.
Finally, for completeness, the difference between the different possible values of the STATE column. I already covered WAITING. If a session is not waiting, it's now on CPU, and it previously waited. If so, it either waited more than 10 ms, in which case it will report WAITED KNOWN TIME, or less than 10 ms, in which case it reports WAITED SHORT TIME, or timed_statistics is false, in which case this column will always be WAITED UNKNOWN TIME. Also, it's important to pay attention to this column, when trying to interpret the WAIT_TIME and SECONDS_IN_WAIT columns.
See here:
http://download.oracle.com/docs/cd/E11882_01/server.112/e10820/dynviews_3016.htm#REFRN30223
for more information.
Hope that helps,
-Mark

Session state protection violation: This may be caused by manual alteration of protected page item P300_name. If you are unsure what caused this error, please contact the application administrator for assistance.

HI ,
the application item is working fine previously. i did not change anything. it is giving error message on p300_name when i submit page
p300_name is text filed.
html form element attributes: disabled="disabled"
source used: always replace any existing value
source type :database columm
: per session
source value: name
default_value: g_name (global variable)
read only: always
read only attributes: name
Please help me to fix this error.
Thanks,

Check the Security attributes of the item, namely 'session state protection'
Similar attributes at page level

Why many sessions with alter session statements?

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