About Oracle session?

hi:
i programed demo with occi and connectionpool.
after created connectionpool ,i found two sessions in the oracle database. i created a connection with the connectionpool ,then found three sessions in the db,why the new 3th session not use created sessions(1th or 2th session)?

The sessions that are created when you create the pool are internal sessions, used for multiplexing of connections. They are not user sessions.

Similar Messages

Question about BC4J data tags, Oracle sessions and Locking!

Hi ,
I have seen numerous examples of JSPs using data tags and in all the examples the data tag for the application module has the "username" and "password" harcoded in it.
My questions are:
1) For a stateful application should we be including the username and password in every JSP page. I personally believe that we should not.
2) If we have a username and password in every JSP page will it not start a new ORACLE user session and if so will it not cause locking problems?
3) If we don't hard code the username and password in every JSP page, will it reuse the same ORACLE session ?
4) How do we avoid locking problems when we use data tags?
5)I can understand the inclusion of username and password in every JSP page if it is a stateless application but again Is there a way we can avoid hardcoding the username and password in every single page?
I would appreciate if some one can let me know if any of my assumptions are incorrect.
JDeveloper Team/Juan any advice?

The username and password are optional. They can be provided via the connections.properties file. The multple entries for username and password don't mean that separate connection are made. The first time the ApplicationModule tag is encountered, your application instance is created. If you are running in reserved mode (look at your releasePageResources tag) the application instance is kept until your Http session times out. If you are running in Stateful or Stateless mode, you application instance is returned to the application pool and retrieved the next time you need an instance. Please refer to the application pool documentation and to the source in oracle\jbo\common\ampool provided in jbohtmlsrc.zip.

JDeveloper Team: How Do I minimize the number of Oracle Sessions using Data Tags?

I am trying to create a stateful application thru my JSP pages. Everytime there is a reference to the application module using the data tag, it looks like it creates a new Oracle Session. But thats not what I want to do.
I have a module in which my first JSP page allows viewing of the data and in subsequent pages I allow insert, update, delete, commit etc.
My Questions:
1) The problem that I am encountering is that every new page that I go to creates a new Oracle session even though I specify the "Stateful" release mode.
How do I avoid this?
It looks like , if one browser user can potentially create 10-20 oracle sessions thru one module, imagine what the impact will be when we have hundreds of users.
2) The sample JSP pages I saw has the username and password hard coded in it every time. Why? For a stateful application can I not specify the username and password just once and have the other JSP pages use the same userid and password.
What are the pros and cons? I thought if I don't use the username and password in all the JSP pages then it probably will not create additional Oracle sessions but that is not true!!
3) If it creates several Oracle sessions , will it not cause locking problems? If so, How do I minimize locking problems in a stateful application.
JDeveloper Team Please advise!!
AM I missing something? I would appreciate if someone can help me out!
null

Thanks a lot for the information. That thread was indeed very helpful. But it still didn't answer all my questions:
1) In the thread you mentioned, it mostly talks about Web beans. In a jsp page (using Web bean) we need to first invoke setReleaseApplicationResources(true) and then invoke releaseApplicationResources().
Does this apply to data tags? I mean I have a tag <jbo:ReleasePageResources releasemode="Stateful" />. Is this enough to release the application module back to the pool or do I have to have something equivalent of setReleaseApplicationResources(true)?
2. In a stateful application, the state of an application is maintained between requests via a browser cookie. For each browser, you can have one state per application module class. I was attempting to run "several browser sessions from the same machine" and the end result was that I got errors and unpredictable results ie it returned me far fewer rows then I saw originally. Should I be actually be running the browser session from different machines?
3. In JDeveloper Documentation (section About Application Module pooling) there is a note section : "If the application module is not recycled the data stays the same. However if the application module was recycled and then activated through a failover, the activation logic re-executes the view objects, so it may bring in more or less rows then originally seen by the clients due to any database updates that have occured."
This is exactly what is happening to me? How do I get rid of this problem? I want to be able to see all the original rows + any new rows That have been committed. Please advise!
4. Are the JDBC connections tied to application module instances? Is it one JDBC connection per application module instance? So, in a stateful JSP, if I end up using a different application I also get a different JDBC connection. IS this true?
5. Does the no of application module instances depend on the no of available JDBC connections? Because it looks like if you set the max no of connections to "5" and set the max no of application module instances to "10", It will be able to instantiate only "5" application module instances due to the limitation set by connection pool.
6. At times I get errors which indicates that the row in view object does not exist. Is this something familiar? Or is it the same problem that John discussed in his thread.
Thanks in advance!

Total CPU time consumed by all Oracle sessions combined.

Hello, I need to summarise total cpu time consumbed by all active Oracle sessions and below is the query thta I could come up with.
However the problem: even if I execute query in a miliseconds duration, the value of total cpu time is always changing for a given session. Hence, is the query below right?
SELECT SUM( c.value)
FROM V$SESSION a,
v$sesstat c,
v$statname d
WHERE a.sid = c.sid
and c.statistic# = d.statistic#
AND d.name = 'CPU used by this session'
AND a.status = 'ACTIVE';
Thanks,
R

Your findings are correct - the statistics is changing all the time. I don't see what is the problem here, you just have to add the time stamp and then you can measure the difference between them.
If you are on 10g or 11g version then I would suggest you to look at V$SESS_TIME_MODEL which also gives interesting aggregated data for session level and for the database level the V$SYS_TIME_MODEL is probable the thing you are looking for.
SQL> select stat_name,value from v$sys_time_model where stat_name='DB CPU';
STAT_NAME VALUE
DB CPU 2125109375But I would like to warn you that there are some anomalies with time measurement in the database. Consider the following case:
SQL> create or replace function f_cpu( p number) return number is
2 m_date date;
3 begin
4 for a in 1..p loop
5 m_date := sysdate;
6 end loop;
7 return 0;
8 end;
9 /
Function created.
SQL> alter session set events '10046 trace name context forever, level 8';
Session altered.
SQL> set arraysize 1
SQL> select f_cpu(300000) from dual connect by level <= 10;
F_CPU(300000)
 0
 0
 0
 0
 0
 0
 0
 0
 0
 0
10 rows selected.
SQL> alter session set events '10046 trace name context off';
Session altered.From the other session you run your statement which just looks for the CPU usage in the first session. You will see that the CPU time is increased all the time, not just after every fetch call, but also between them.
Now comes the funny thing - the SQL_TRACE shows the following ( I have removed all wait events to get more clear picture for my purpose):
PARSING IN CURSOR #4 len=53 dep=0 uid=88 oct=3 lid=88 tim=347421772231 hv=2194474452 ad='230f2310' sqlid='2m7v6ua1cu1fn'
select f_cpu(300000) from dual connect by level <= 10
END OF STMT
PARSE #4:c=0,e=124,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=347421772223
EXEC #4:c=0,e=103,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=347421772446
FETCH #4:c=671875,e=588199,p=0,cr=0,cu=0,mis=0,r=1,dep=0,og=1,tim=347422360764
FETCH #4:c=1437500,e=1282871,p=0,cr=0,cu=0,mis=0,r=2,dep=0,og=1,tim=347423644892
FETCH #4:c=1156250,e=1182013,p=0,cr=0,cu=0,mis=0,r=2,dep=0,og=1,tim=347424827769
FETCH #4:c=1234375,e=1181276,p=0,cr=0,cu=0,mis=0,r=2,dep=0,og=1,tim=347426009910
FETCH #4:c=1187500,e=1179318,p=0,cr=0,cu=0,mis=0,r=2,dep=0,og=1,tim=347427190068
FETCH #4:c=593750,e=593217,p=0,cr=0,cu=0,mis=0,r=1,dep=0,og=1,tim=347427784188In this output "c=" is CPU time in 0.000001s (microseconds) and "e=" is elapsed time. There are many rows where CPU time > elapsed time, what is a well known problem of reporting for CPU timing. This was a single session so this result is unrealistic: how one can use 1.43s CPU time in only 1.28s time.
FETCH #4:c=1437500,e=1282871,p=0,cr=0,cu=0,mis=0,r=2,dep=0,og=1,tim=347423644892The CPU time is bigger than elapsed time - and you can probably notice as well that CPU time is rounded to 00,25,50,75 .
There are some interesting problems with time measuring in Oracle and one can easily be caught in this trap. I have written a post about this in my blog: http://joze-senegacnik.blogspot.com/2009/12/measurement-error-in-trace-file.html
HTH, Joze
Co-author of the forthcoming book "Expert Oracle Practices"
http://www.apress.com/book/view/9781430226680
Oracle related blog: http://joze-senegacnik.blogspot.com/
Blog about flying: http://jsenegacnik.blogspot.com/
Blog about Building Ovens, Baking and Cooking: http://senegacnik.blogspot.com

Direct mapping of Siebel OM context to Oracle session attributes

Hello all,
I wonder if it is possible to direct map of Siebel OM context to Oracle session attributes. Have anyone experience on this? If yes in which version of Siebel? And if this is applicable then what about in case of using connection pooling? Is there any documentation?
For example it would be very useful if we could have information about Siebel tasks in the fields of V$SESSION.
Module = “BUSCOMP NAME”
Action = “VIEWNAME”
Client Info = “TASKID”, “SERVERNAME”, “USERID”, “COMPONENT NAME”
Thank you,
Peter

Hi,
Our Siebel profiling Tools do exactly what you want. They work on versions 7.7, 7.8, 8.0 and 8.1.
Also, in Siebel 8.1 and above there is now a bind variable :1 that provides this context information.
R
Robert Ponder
Lead Architect and Director
Ponder Pro Serve
cell: 770.490.2767
fax: 770.412.8259
email: [email protected]
web: www.ponderproserve.com

About Oracle OpenWorld

Hi;
I need to learn about some information and need some advices about Oracle OpenWorld event. I checked oracle.com about registiration and there are some option like Full Conference,Full Conference -Plus Oracle Develop, Full Conference-Plus Primavera
For Oracle Apps Dba which one is will be better?If someone join this event before can she/he give me details? Is it possible to join event freely or its mandotary to make registtiration for can join this event.
Can anyone say me what this event can give us, what is the benefit of this event?
If we make registiration how we can arrange visa paper(for instance oracle send us invitation letter for visa) or hotel etc?
Any information can be usefull
Thanks a lot
Helios

Hi Helios,
I attended OpenWorld in 2006; here are some opinions, and even a few facts ;-)
1) You must register to attend OpenWorld. In some specialized cases it's possible to have registration fees waived (getting a blogger pass, for example), but you must be a registered guest to attend. The [Oracle Discover|http://www.oracle.com/us/openworld/registration.htm#discover] pass is a much cheaper way of getting access to the conference, but you won't get access to most of the conference sessions, or all of the events. Still, if your budget is tight, the Discover pass offers access to a lot of content, including the exhibition floor, user group and OTN areas, etc.
2) If you get a Full Conference pass, I think there will be enough to occupy your time as an Apps DBA at OpenWorld without getting the Develop or Primavera addons. Some of my colleagues did find the Oracle Develop program to be very valuable, however, so if you do have an interest in one of the [offered tracks|http://www.oracle.com/us/openworld/018069.htm#tracks] , it might be worth the extra fee.
3) If you go, prepare beforehand. The conference is huge, and trying to figure out what sessions and events to attend on a daily basis can take a lot of energy and planning. You can always change your mind about your schedule as the week goes on, but it's a good idea to have a framework before you arrive. Furthermore, interesting and popular sessions can fill up quickly, so building your session calendar beforehand is highly recommended. Steven Chan's blog has [some pointers|http://blogs.oracle.com/stevenChan/2009/08/connect_at_openworld_2009.html] to the EBS and Application Tools/Technology tracks for OpenWorld 2009, so you can get an idea of what's available.
4) I don't know if Oracle offers invitation letters for non-US attendees who need visas. I do know that arranging hotel accommodation is the attendee's responsibility. Many of the hotels near the conference center (and all over San Francisco) fill up very quickly. Oracle does offer shuttle services from some hotels to the conference center.
5) If you go, you will have a great time. It's good learning and networking experience, and Oracle puts on a good show. :-)
Hope this helps a bit!
Regards,
John P.
http://only4left.jpiwowar.com

No. of Oracle sessions

Hi All,
We are running oracle 8i on sun sparc system solaris 2.6. Apps uses OCI.
There are about 500 users which runs a single exectable say ABC whose size is 14M. We have a RAM of abour 10G. Now if all these users loged in starts the executables ABC it will crash our system immediately.
Can anybody help me in making it better on memory or any other we can improve it.
Thanks and regards,
Kshitij

1. There is a multithreaded application ABC. Which is being started by all the users say 500. Now as soon as the excuatable is started it connects to the Oracle or sets up a oracle session two of them one for OCI related activity and other for Pro*c related activity. Now you may be asking why we are using both, well its a long story and that code has been never touch for about 6 years now. So we have to live with that. Here is what we have, when we do "top" it says we have left with say 12M space out of 8G (RAM)and it still keeps on running as we have only 60 users logged in. So that's why we did not had these problems yet. But I am expecting that.
Currently we have the swap area at 2G only. How much I need to put the swap memoryfor this. We have a constraint on this? (Bad for us).
So the first thing you need to do is to make the clients connect to the app instead of starting the app. In this way, you app can handle more than one client; and assuming you have a reentrant code the code can execute on behalf of any user.
2. Can you be more elaborate on the OCI multiplexing sessions keeping in this the above point? That will help me a lot.
In OCI, sessions and connections are distinct object. Connections map to a data pipe on which calls are routed to the server, ie in another sense it maps to a unit of scheduling on the server for a call. Sessions map to the user context in which a call is executed. For example the same select could return different results depending upon the user and its priveleges. Session can be moved between connections. This is called multiplexing or session pooling. This allows you to have state retained for each individual user (upto 500 in your case) while mapping them on to one or more connections. the number of connections you would need is at most the number of concurrent users.
ProC and OCI can share the same connection and have different sessions. Creating a single multithreaded reentrant app to service multiple users allow you to use less resource on your machine.
null

About Top session in a DB

Hi,all,
I need to decide what is top session in a DB, to see how much it would consume resource in that server. When I use TOAD to do it, I find these are so many factors when I make dicision. such as "CPU used by","Physical write" ...
That means "It is top session sort by CPU used by". So I want to know those essential factors, by which certain session would consume much resource.
Do you have any advice? Are there any scripts on hand to do this job,except third-part tool like TOAD?
Robin

However when I want to work with the top sessions I use the Performance Manager ( This is part of OEM ). These are its advices and descriptions.
Top SessionsSessions are displayed in descending order based upon the delta value of the statistic chosen as the sort statistic. This is a customizable chart that allows sorting and filtering of sessions based upon a number of user settable criterion.Typically the session that is performing the most I/O is the session that should be targetted for tuning. To identify the SQL statement the session is currently executing you can drill down to the Current SQL Chart. From this drilldown you can choose to tune the SQL statement directly.Complete detailed information about any session can be found by selecting the session and drilling down to the Session Details Chart. This chart allows you to view the current SQL statement as well as resource consumption and performance metrics at the same time.The list of all cursors the session has currently open is available through the Open Cursors For This Session Chart. This helps identify all the SQL statements the session is using. From this chart SQL statements can be selected for tuning further drilldown and analysis.This chart can be used to create a customized Top Sessions view. All of the available statistics and identifiers for sessions are shown in a large table by default. By using the Set Options button in the toolbar the chart can be customized to show only the items of interest and the sort criteria can be changed. Customized charts can then be saved, named and accessed directly by name. Specific advice for each of the data items shown on this chart is available below.This chart includes the following data items:
Session NameDescription This data item represents either the Oracle username of the current session or, if the session is owned by an Oracle background process, the name of the background process. Data Source select NVL(s.username, b.name) from v$session s, v$bgprocess b User Action The session name is useful in determining which database users are consuming the most resources. If there is a need to prevent a particular session from consuming too much, one way to control resource usage is to create a resource profile. This profile can then be applied to the Oracle user specified in the session name. The profile provides hard limits on any resource that is explicitly added to it. Some of the resources that can be controlled with profiles are cpu usage, idle time, connect time, etc.
OS UsernameDescription This data item represents the name of the operating system client user. That is the username reported at the time of the database connection time from the operating system. Data Source select osuser from v$session User Action The operating system username can be useful if more than one OS user shares a particular Oracle account (such as SYSTEM). If the session name is not unique, the OS username may provide the identity of the user for the session.
and so on...
Do you have OEM ?
Joel Pérez

Unit Testing and Oracle Sessions

We have an issue regarding Oracle session and SQL Developer Unit Testing.
Every time we run a Unit Test in SQLDeveloper a new Oracle session is created. When closing that Unit Test, the session, however, is not disconnected.
And the only way to close that "Unit Test" session is to close SQLDeveloper.
This is causing problems with the no. of sessions available to developers.
Any help would be much appreciated.
Subboss

The focus of this forum is report design. The actual testing of reports would be subject to your own internal policies and procedures.
Jason

Difference between upgrdae and migration about oracle database

Difference between upgrdae and migration about oracle database
please give the comments

Well, the question is almost philosophic... 
In 9i, there is a Migration Guide whereas in 10g there is a Upgrade Guide. 
Furthermore, in 9i, there is the command line startup migrate whereas in 10g that's startup upgrade.
Somebody think upgrade when go to new release, and migration when go to new version. 
Others think upgrade when new version replace database in place, and migration when new version include a move of database. 
Another point of view is : upgrade is for technical, and migration for application/data. 
 
Well, after these explanations, your upgrade/migratation notion will not be more clear, but I think that is not very important, only a terminology game. The most important is to know what you need : new version or new release. 
 
Nicolas.

Document about Oracle 10g New Features

Hi all,
I would like to share a document I wrote about Oracle 10g New Feature. I hope it would be useful.
Currently, I am updating the document to include Release 2 features. Any comments or suggestion is appreciated.
Download link:
http://www.operflow.com/Oracle_10g_DB_Summary.pdf

Hi Ahmed,
Good Work !!!
I just visit your blog it is very interesting about you and your country.
Regards
Taj

Not able to view Forms Server version in Help: About Oracle Applications after the forms upgrade 10.1.2.3.0

Hi all,
DB:11.2.0.3.0
EBS:12.1.3
O/S: Sun Solaris SPARC 64 bits
I am not able to view Forms Server version in Help: About Oracle Applications after the forms upgrade 10.1.2.3.0 after the forms upgrade 10.1.2.3.0 as per note:Upgrading OracleAS 10g Forms and Reports to 10.1.2.3 (437878.1)
Java/jre upgraded to 1.7.0.45 and JAR files regenerated(without force option). Able to opne forms without any issues.
A)
$ORACLE_HOME/bin/frmcmp help=y
FRM-91500: Unable to start/complete the build.
B)
$ORACLE_HOME/bin/rwrun ?|grep Release
Report Builder: Release 10.1.2.3.0 - Production on Thu Nov
28 14:20:45 2013
Is this an issue? Could anyone please share the fix if faced the similar issue earlier.
Thank You for your time
Regards,

Hi Hussein,
You mean reboot the solaris server and then start database and applications services. We have two databases running on this solaris server.
DBWR Trace file shows:
Read of datafile '+ASMDG002/test1/datafile/system.823.828585081' (fno 1) header failed with ORA-01206
Rereading datafile 1 header failed with ORA-01206
V10 STYLE FILE HEADER:
        Compatibility Vsn = 186646528=0xb200000
        Db ID=0=0x0, Db Name='TEST1'
        Activation ID=0=0x0
        Control Seq=31739=0x7bfb, File size=230400=0x38400
        File Number=1, Blksiz=8192, File Type=3 DATA
Tablespace #0 - SYSTEM rel_fn:1
Creation   at   scn: 0x0000.00000004 04/27/2000 23:14:44
Backup taken at scn: 0x0001.db8e5a1a 04/17/2010 04:16:14 thread:1
reset logs count:0x316351ab scn: 0x0938.0b32c3b1
prev reset logs count:0x31279a4c scn: 0x0938.08469022
recovered at 11/28/2013 19:43:22
status:0x2004 root dba:0x00c38235 chkpt cnt: 364108 ctl cnt:364107
begin-hot-backup file size: 230400
Checkpointed at scn: 0x0938.0cb9fe5a 11/28/2013 15:04:52
thread:1 rba:(0x132.49a43.10)
enabled threads: 01000000 00000000 00000000 00000000 00000000 00000000
Hot Backup end marker scn: 0x0000.00000000
aux_file is NOT DEFINED
Plugged readony: NO
Plugin scnscn: 0x0000.00000000
Plugin resetlogs scn/timescn: 0x0000.00000000 01/01/1988
00:00:00
Foreign creation scn/timescn: 0x0000.00000000 01/01/1988
00:00:00
Foreign checkpoint scn/timescn: 0x0000.00000000 01/01/1988
00:00:00
Online move state: 0
DDE rules only execution for: ORA 1110
----- START Event Driven Actions Dump ----
---- END Event Driven Actions Dump ----
----- START DDE Actions Dump -----
Executing SYNC actions
----- START DDE Action: 'DB_STRUCTURE_INTEGRITY_CHECK' (Async) -----
Successfully dispatched
----- END DDE Action: 'DB_STRUCTURE_INTEGRITY_CHECK'
(SUCCESS, 0 csec) -----
Executing ASYNC actions
----- END DDE Actions Dump (total 0 csec) -----
ORA-01186: file 1 failed verification tests
ORA-01122: database file 1 failed verification check
ORA-01110: data file 1:
'+ASMDG002/test1/datafile/system.823.828585081'
ORA-01206: file is not part of this database - wrong
database id
Thanks,

Web.Show_document and oracle session

Hi,
I am uploading a file on to Oracle Portal through web util. After this, I am calling the web.showdocument to view the uploaded file. But I am seeing only a blank page. This is the sequence flow.
1. Forms call a procedure which will create a dummy record of the document to be uploaded. This insert is happening as an autonomous transaction.
2. The Forms call webutil and uploads the document
3. Then I am calling web.show_document to view the document. The browser is opening an empty page. But once I did an explicit commit, I can open and view the document successfully in the same way.
I am using '_blank' option.
So, what I infer from this is that web.show_document opens the browser with a new oracle session by passing authentication details internally. Is there any way view the document without doing an explicit commit?
Thank you.
Warm Regards,
Raja.
Message was edited by:
Raja M

Check
[b]Mozilla Firefox Options
File Types
The Download Actions dialog, which can be opened by clicking the
Manage... button, contains file types that you have downloaded.
You can choose what Firefox should do when clicking on a specific
file type by selecting the file type you want to modify and clicking the
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[ask] about oracle sql injection and escalation

Hello,i'm student , i'm studying oracle,now i want to research about oracle sql injection,i had read some tuttorial such as *'Hacking Oracle From Web,Advanced SQL Injection In Oracle Databases,Oracle Hacker HandBook ...'* but when i try to demo on localserver (11.0.1.6) but not run,and this is my demo
-- first,i created table users
create table users (name nvarchar2(50),pass nvarchar2(50))
-- then i created procedure with system user
create or replace procedure system.adduser(u nvarchar2,p nvarchar2)
as
begin
insert into users values(u,p);
end;
-- grant execute privilege to oc user
grant execute on adduser to oc
-- login with user oc and create a procedure
create or replace procedure sqli
as
begin
execute immediate 'grant dba to oc';
end;
-- and then,i run system's procedure
declare
begin
system.adduser('admin','admin'' ; execute immediate ''declare begin sqli() end;');
end;
i hope oracle master help me to i can understand and improving my knowledge
Thanks

The best forum for this is probably Forum Home » Java » SQLJ/JDBC
Presumably you are refering to oracle.sql.TIMESTAMP. While this is intended to (and does) correspond to java.sql.Timestamp it can't be a subclass because it needs to be a subclass of oracle.sql.Datum.

Old Oracle Session with Tomcat is not kiiling automatically

Hi,
I am facing a problem of increasing inactive oracle sessions with tomcat, Old Oracle sessions with tomcat are visible with new one.
if somebaody did not restarted tomcat gracefully, then does Oracle keep the session connected or is there any way that whenever any one restarted tomcat abnormally, Oracle session can be killed.
I had restart the database to kill session.

Could you please tell me that where do i set this parameter in parameter file or sql net file and what is the recommended value, do you have any document on this.
Another thing tomcat is in other server machine and my database is in different server machine, killing process in tomcat server machine manually may not kill linux process on oracle database machine and therefore oracle sessions are still there.
Is it possible?
Edited by: user605066 on 28-Aug-2008 04:59

About Oracle session?

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