Server Administration :: Identifying Proxied User Sessions
Mar 30, 2011
I'm sure you are all familiar with proxy users, they've been around since 9i: orcl> create user low identified by low;
User created.
orcl> create user high identified by high;
User created.
orcl> grant dba to high;
Grant succeeded.
orcl> alter user high grant connect through low;
User altered.
orcl> connect low[high]/low
Connected.
orcl> sho user
USER is "HIGH"
orcl>
Is there any way that I can find out which of the current sessions was proxied, and through what user? I know that from within the session I can query my userenv context and find out, but I can't see how to do it otherwise. It must be possible: the audit trail records both the real user and the proxy user.
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Sep 14, 2010
I need to increase the size of shared pool for that i need to change the size of parameter sga_target and sga_max_size these are static parameter so that I need to change in spfile first then start instance then these parameter will get change. But when I create pfile from spfile it gives error:
ERROR at line 1:
ORA-01565: error in identifying file '?/dbs/spfile@.ora'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
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Oct 24, 2013
I am on Oracle 11.2.0.3 on Linux. In my production database, I am getting this alert, in the alert log:
--the below two lines are from alert log.
Error 604
trapped in 2PC on transaction 50.73.546578. Cleaning up.
--query from a data dictionary view
SQL> select count(*) from DBA_2PC_PENDING;
COUNT(*)
----------
1
When I query the production database I see that there is one row in the DBA_2PC_PENDING view. But I dont' know how to identify which are the databases that are involved in this distributed transaction. That is my first issue - how to identify which are the two databases that are involved in the distributed transaction?
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Mar 9, 2012
My application is opening a lot of sessions in my DB server. I applied resource_limit=true and idle_time=15 min. ans assign this profile to all application user.
Now I am seeing a lot of sessions having status sniped in v$session.
I want to clean up these sniped sessions and what they mean.
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Aug 19, 2010
I am using oracle 10g as server in my lab. I faced some problems initially, but later after increasing the USERS tablespace it is working fine.
But there is still one problem. During the query execution some queries will be blocked and it doesn't leave any consequent queries to execute from the same user.
The blocked sessions will be displayed in the admin page under blocking sessions link. There is a option to kill the session. But when i do that, it affects all the users and the connection will be lost to all the users. again I have startup the database from beginning.
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Jul 13, 2010
We had an issue last week were we had a session with a very basic SQL query lock up the database, spiking the CPU at 100%. When you would kill the session, the lock would just jump to another session and so on. We finally had to restart the database since our clients were being kicked out. After the restart of the database, the LGWR ended up locking and held the CPU between 85-95%. The archive logs were switching every 5 minutes, when normally it would be every 45min. We spoke with Oracle Support, but they just ended up brushing the issue off and saying it was a hardware issue and were not able to provide any kind of backing to that.
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Mar 26, 2013
I have a simple question about database sessions. The value of parameter "sessions" is set to 500 and the users connect to database through an application server(Jboss). There are more than 500 users connect to the database through application.
My question is, how more than 500 users can connect to the database without any issue, if we set the value of "sessions" parameter to 500?
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Feb 5, 2011
I have a table with counter value which will be incremented or decremented by several application servers.
SQL> select * from test;
COUNTER
----------
10
Application servers(multiple servers) will be running update against this row for increasing the counter value or decreasing the counter value.
update test set counter=counter+1;
update test set counter=counter-1;
update test set counter=counter+1;
update test set counter=counter+1;
So when update happens concurrently to this table will the counter value gets messed up?
I did a small test by opening multiple sessions for running update and the result I got for above update statement was 11,10,11,12.
But our developer is bit skeptical about this approach and he is using select for update and then updating the row.
Which approach will be better?
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Oct 27, 2010
I killed some 70 sessions which where inactive couple of days ago using alter system kill session(sid,serial#) immediate;
But even after killing them it still exists in the v$session view when I query select sid,serial# from v$session where username is not null; It has the same sid and serial#....I tried killing them every now and then but it still shows those exists
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May 25, 2010
We have quite a number of sessions in database MES (production) coming from another machine.
From v$session, the program is oracle@WID27 (TNS V1-V3). This WID27 (hostname) consists of quite a number of development databases inside. We have to trace which jobs are actually triggering this, as WID27 are not suppose to connect to production databases.
How can we tell whether the sessions came in is from dblink or from the machine itself?
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Nov 15, 2010
I created an externally authenticated user in database. And can login without password with below syntax.
SQL> connect / @TESTDB
Connected.
SQL> show user;
USER is "SCOTT"
This scott user has a proxy permission to another DBuser PROXY_USER. Previously I used to login using below syntax.
connect scott[proxy_user]/password_for_scott@TESTDB
So now, what syntax should be used for this "ExternallY Authenticated" user to login as a proxy user?
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Nov 9, 2011
I have a strange problem when creating a view in user from another user
I have a user called "Cash_tst"
its syntax creation is
-- Create the user
create user CASH_TST
identified by ""
default tablespace CASH
temporary tablespace TEMP
profile DEFAULT
quota unlimited on cash;
-- Grant/Revoke object privileges
grant connect to CASH_TST;
grant dba to CASH_TST;
grant resource to CASH_TST;
-- Grant/Revoke system privileges
grant create any view to CASH_TST;
grant unlimited tablespace to CASH_TST;
I want to create a view
CREATE VIEW TAMER
AS SELECT *
FROM [b]AROFL[/b].RA_CUSTOMER_TRX_LINES_ALL_BEFO
"AROFL" is another user on the same database
when try to create the view "tamer" i got message of
"insufficent privilege"
although i granted "create any view" to the user "cash_tst"
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May 6, 2011
The following link states
Quote:
SESSIONS_PER_USER
Each instance maintains its own SESSIONS_PER_USER count. If SESSIONS_PER_USER is set to 1 for a user, the user can log on to the database more than once as long as each connection is from a different instance.
[URL].....
Of course the following is not working even when resource_limit is TRUE
ALTER PROFILE DEFAULT LIMIT SESSIONS_PER_USER 2;
How can I restrict a user to have limited sessions say 2 sessions across 4 node cluster? Presently I am checking the sessions logged in using sql+ and no connection pooling of front end etc. is involved.
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Apr 11, 2011
I have an assignment, i am suppose to disconnect all the users that are blocking sessions for over three hours. Below is my code which is not working
Create or replace procedure b_user IS
Declare
ssid number;
serial number;
Begin
[code]......
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Sep 10, 2012
I need to trace all sessions created from specific user and specific machine . Got some code from internet and customised .
CREATE OR REPLACE TRIGGER SYS.enable_trace_trigger
AFTER LOGON ON DATABASE
DECLARE
[Code]....
I have yet not created it on db .
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Sep 22, 2011
In my project a user has updated a column with wrong value which had caused some issues.
I wish to find the userid of person who did the update on the table.
There is no trigger on that table
I used the following queries but have not got success
select * from USER_TAB_modifications where table_name like '%XYZ%';
select * from USER_AUDIT_OBJECT ;
I WAS ABLE TO GET WHEN LAST UPDATE TOOK PLACE on table but not userid details
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Sep 20, 2011
We have installed Oracle RAC 11gR2, installation was all successful.But i cannot see ASMSNMP user to login as ASM enterprise manager .If i tries to login as sys (even after assigning SYSASM role) he cannot login.
Quote:Set Oracle_sid=+ASM1
sqlplus / as sysasm
grant sysasm to sys;
conn sys/*** as sysasm
ORA-01031 insufficient privileges
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Jul 15, 2010
Whenever I create a table using login A, the table gets created successfully. But when I query the dba_objects, the object owner is different, login B. What might be the reason behind this?
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Mar 30, 2012
Got following error while droping user
DB:9.2.0.8.0 OS:Windows 2003
SQL> drop user custom cascade;
drop user custom cascade
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-21700: object does not exist or is marked for delete
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Mar 18, 2013
I need to ask about PGA memory. Is this memory for every user or every session
i.e. PGA 200M
I have 2 users with 300 connection with one of them. Is 200M for 300 connection or for every connect.
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Sep 14, 2010
I need to create one to many user DB link in oracle 10g. Meaning I have a user A in database 1 and I want to access the objects from user B,C,D in database 2, how to create a public database link so that i can have this one to many user access?
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Aug 27, 2013
How to determine number of connections establishing from application server to database server for a particular user and also query the user is running in database.
user -- application user created in database.
same user exist in application.
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Aug 19, 2011
Is there any default way to assign user roles to uses ?
Suppose I want assign to user different roles to different users on views, tables etc.
I wan to implement Access control list & Access request objects (ACL/ARO).
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Jul 28, 2011
I want to drop some users which are no longer been used .What are the precautions i need to take before i drop users? I have taken logical backup (Export) of users i want to drop.Is there anything i missed out before i drop user?
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Sep 27, 2011
I just create a user and tried to log in but it gives the following error, why?
SQL*Plus: Release 10.1.0.4.2 - Production on Tue Sep 27 10:57:55 2011
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production
SQL> create user user1 identified by user1;
User created.
SQL> conn user1
Enter password: *****
ERROR:
ORA-12560: TNS:protocol adapter error
Warning: You are no longer connected to ORACLE.
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May 21, 2011
WHEN I CONNECT TO SCOTT OR ANY KIND OF USER (EXCLUDE SYS)I CONNECT EASILY BUT PROBLEM WITH SCOTT OR OTHER THEY CANNOT BE
SHUTDOWN THE DATABASE AT THAT TIME THE ERROR ARISES ARE
ORA-01031: insufficient privileges SO OUR DATABASE CANT BE SHUT IT DOWN.
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Mar 22, 2011
I want whenever a user is created in database the server send me a mail about this.
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Oct 19, 2012
last two years i am using oracle 9i in windows 2003 server but now i installed oracle 10g on another server (PC) , i want to connect 9i to 10g with same database and user .
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Sep 3, 2013
I have login through the sysdba and created dblink and modified the tnsnames.ora for necessary changes. And the it started working correctly and I can able to get the data by selecting it.But when I login with different user that is showing the following error.
ORA-12154: TNS:could not resolve the connect identifier specified
How to resolve this,is there any privileges or permission need to give to that user.
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Oct 1, 2012
I need to see all schema users password in a text.I am database admin,but it difficult to remember the password of all users created in single database So we also dont want to change password of all time,table to view password in text. Also we all know we can see using dba_users, but it was showing in hash value i need it in a text
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