Question

oracle_sessionn

Asked by: sam15

Can someone explain how oracle process/sessio/connection  is created?

When someone submits a URL that runs a stored procedure (several SQL statements) does oracle show a session/process for that or multiple sessions? how long would that show in the V$session or V$process. Does it go away after it runs.

Could bad SQL or program that takes 5 minutes  results in many sessions that couls cause the database to  not accept any more connections (ORA-00020).

PID       SID   SER#  BOX          USERNAME   STATUS   OS_USER      PROGRAM                      
--------- ----- ----- ------------ ---------- -------- ------------ -----------------------------
11244000  7     1     ts25n                    ACTIVE   ora920       oracle@ts25n (CJQ0)                
9691148   45    299   web3          ABCADMIN   ACTIVE   oraS10AS     httpd@web3 (TNS V1-V3)    
10277204  84    123   ts25n         ABCADMIN   ACTIVE   oraS10AS     oracle@ts25n (P003)        
5890152   56    452   web3          ABCADMIN   ACTIVE   oraS10AS     httpd@web3 (TNS V1-V3)              
3748228   19    168   web3          ABCADMIN   ACTIVE   oraS10AS     httpd@web3 (TNS V1-V3)              
10834080  60    343   web3          ABCADMIN   ACTIVE   oraS10AS     httpd@web3 (TNS V1-V3)              
1065264   41    173   web3          ABCADMIN   ACTIVE   oraS10AS     httpd@web3 (TNS V1-V3)              
1298528   50    91    web3          ABCADMIN   ACTIVE   oraS10AS     httpd@web3 (TNS V1-V3)  

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Asked On
2009-11-04 at 12:59:25ID24872471
Tags

oracle

Topics

Oracle Database

,

Oracle 10.x

,

PL / SQL

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: oleggoldPosted on 2009-11-04 at 13:37:29ID: 25744218

the best answer is in Oracle lit:
http://www.youngcow.net/doc/oracle10g/server.102/b14220/process.htm
"Connections and Sessions
Connection and session are closely related to user process but are very different in meaning.

A connection is a communication pathway between a user process and an Oracle instance. A communication pathway is established using available interprocess communication mechanisms (on a computer that runs both the user process and Oracle) or network software (when different computers run the database application and Oracle, and communicate through a network).

A session is a specific connection of a user to an Oracle instance through a user process. For example, when a user starts SQL*Plus, the user must provide a valid user name and password, and then a session is established for that user. A session lasts from the time the user connects until the time the user disconnects or exits the database application.

Multiple sessions can be created and exist concurrently for a single Oracle user using the same user name. For example, a user with the user name/password of SCOTT/TIGER can connect to the same Oracle instance several times.

In configurations without the shared server, Oracle creates a server process on behalf of each user session. However, with the shared server, many user sessions can share a single server process.

"

 

by: sam15Posted on 2009-11-04 at 13:47:47ID: 25744313

but here is my question i am trying to answer.

A session is a session.

When a user opens a session using SQL*plus or toas or whatever, and he runs the worst SQL on earth, it is still one SESSION. correct?

When someone calls a stored procedure from the web via mod_plsql that is one SESSION or CONECTION. it does not matter how bad the SQL is or how many SQL statements there are.
correct?

My point is that increasing number of sessions can not be due to bad code running. It is too many clients trying to connect simultaneously.

 

by: oleggoldPosted on 2009-11-04 at 13:50:00ID: 25744338

That should answer our first question , as for others, You're using Oracle application server (ais) so it's the ais configuration,not Oracle db congfiguration may create several connections/sessions that You see and indeed exist in parallel up untill the connection has ended or session has been terminated.

 

by: oleggoldPosted on 2009-11-04 at 13:53:57ID: 25744372

The processes parameter can be  viewed in intit.ora or v$parameter:
"SQL> select * from v$resource_limit;
SQL> show parameter processes
"

SQL> select * from v$resource_limit;
SQL> show parameter processes

                                              
1:
2:

Select allOpen in new window

 

by: sam15Posted on 2009-11-04 at 13:56:40ID: 25744410

what answers the first question?

Was my thinking correct in that a program is run over 1 session (not 100 sesssions) and even if it is bad and takes 10 minutes it will not keep incresing the processes/session in the DB>

 

by: oleggoldPosted on 2009-11-04 at 14:04:27ID: 25744479

When a user opens a session using SQL*plus or toas or whatever, and he runs the "worst SQL on earth, it is still one SESSION." correct

"When someone calls a stored procedure from the web via mod_plsql that is one SESSION or CONECTION. it does not matter how bad the SQL is or how many SQL statements there are."
correct.
It's not code,it's Oracle ais, most probably some configuration to optimize Your code execution spawnes multiple user processes ,e.g. - multiple sessions

 

by: sam15Posted on 2009-11-04 at 14:24:29ID: 25744699

Can you explain what you mean b this:

<<<Your code execution spawnes multiple user processes ,e.g. - multiple sessions>>

That means i was incorect if you are correct.  If i ran a program it can spawn multiple user processes??
would that show many processes consumed in V$process or V$session. Maybe that spawning is what causes it.

If the session shows "INACTIVE" status is it sill connected session? How does it go away. Why is it marked "inactive".

20120131-EE-VQP-002

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