Preventing ALTER SESSION at logon?

Hi
We had a mystery in that a table created via SQL Developer and Toad where diffetent regarding the varchar2 columns if we didn’t say if it was CHAR or BYTES during the create script.
We found out that SQL Developer seems to performer an ALTER SESSION statement during logon based upon the preference settings. I have a database where the nls_length_semantict is set to CHAR. Default value for SQL Developers preference is BYTE.
We have a lot of databases with both settings and this is really an annoying problem. Is there a way where we can use the settings as they are in the database?
Regards
Marika

Hi
Yes - this is the preference that I mean. It creates problems since our user ain't aware of it. Also is it a probelm when one working with several databases with different settings at the same time. I would like an option that turn off this peference. I want to use the settings in the database without having to know them in advance and change the preference everytime. How do I do that?
Regards
Marika

Similar Messages

ALTER SESSION executed before every select statement

When I log what the oracle jdbc driver is doing I see the following before EVERY select statement:
ALTER SESSION SET ISOLATION_LEVEL = READ COMMITTED
I know what this means and that it is the oracle default, but:
as this is the default why does the driver have to send this information across the network to the database for every single query? Is there anyway to prevent it? We've looked at network traffic and this ALTER SESSION is adding 10 percent and it seems, at least to me, that it should be unecessary.
I've searched around but cannot find anything directly relating to this.
Thanks.

Do you call connection.setTransactionIsolation()? That causes exactly that statement to be executed.
Do you use a connection pool? If yes: check if the pool calls setTransactionIsolation() - read the source, or ask the vendor, or decompile it (if that is legal in your part of the world.) If not using a pool: get one.

"ORA-02248: invalid option for ALTER SESSION" -- Urgent request

Hi All,
We use Discoverer 3.1.36.06 and are in middle of a 3i to 10g upgrade for Discoverer for a data warehouse setup. Our databases where upgraded to 10g from 9i and now we get the error message saying:
"ORA-02248: invalid option for ALTER SESSION"
I got some very helpful info abt the prob from the link below.
Discoverer 3i Issue with 10.2.0.3 - ORA-02248
We are mid way through the 3i to 10g upgrade and just need a quick fix for the next 2-3 weeks while the upgrade is finished.
Does any one know if changing the NLS language and applying the post longon trigger on Database id's would help in resolving this connection issue temporarily.
Any advice is deeply appreciated.
Thanks.
Edited by: Paul S on Dec 15, 2008 3:01 PM Corrected the link

Hi,
There are two types of trigger you can use: database triggers and discoverer triggers. You probably want to use a database trigger.
If you are using an APPS mode EUL (ie. logging using Applications username/passwords) then you will be logging in as the APPS database user and the syntax is:
create or replace trigger APPS.disco_logon_trigger after logon ON APPS.SCHEMA
begin dbms_session.set_nls('nls_date_format', '''DD-MON-YYYY'''); end;
If it is a database EUL and the database user is gl_inq then the syntax would be
create or replace trigger gl_inq.disco_logon_trigger after logon ON gl_inq.SCHEMA
begin dbms_session.set_nls('nls_date_format', '''DD-MON-YYYY'''); end;
Rod West

How to add alter session to report query !!

Hi all,
I need to add
alter session set "_optimizer_cost_based_transformation"=off
before select query runs in Oracle discoverer.
Recently I encountered with ORA 00600 bug and this is the way it can be solved.
Before running the query, the session should be altered.
Any ideas is appreciated..
Thanks

Hi,
Your best option may be to turn the cost based transformation off using a logon trigger. It will then be turned off for all Discoverer sessions. You will need to create a package procedure that executes the alter session command. Then call this procedure either from a Discoverer logon trigger, or a database trigger that checks that the session is a Discoverer session. Or if you are using the eBS you can use the Applications initialization profile.
However, an alternative approach may be to use a hint in the query. For example, you can set the optimizer features back to previous version that does not have this optimizer feature e.g. using:
/*+ optimizer_features_enable('9.2.0') */
Then put this hint in the query using a view. I am not sure that ther is a hint which will turn just this feature off.
Rod West

Alter session when login

Hi,
on 11G R2,
I want that user3 change session to user2 just on connection. How is it possible ?
I want to avoid user3 to issue :
ALTER SESSION SET CURRENT_SCHEMA =USER2at each connection.
Thanks for help.

it working , see this
SQL> conn hr
Enter password:
Connected.
SQL> select PRIVILEGE from session_privs ;
PRIVILEGE
CREATE SESSION
ALTER SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE CLUSTER
CREATE SYNONYM
CREATE VIEW
CREATE SEQUENCE
CREATE DATABASE LINK
CREATE PROCEDURE
CREATE TRIGGER
CREATE TYPE
CREATE OPERATOR
CREATE INDEXTYPE
ADMINISTER DATABASE TRIGGER
15 rows selected.
SQL> conn scott
Enter password:
Connected.
SQL> select PRIVILEGE from session_privs ;
PRIVILEGE
CREATE SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE CLUSTER
CREATE SEQUENCE
CREATE PROCEDURE
CREATE TRIGGER
CREATE TYPE
CREATE OPERATOR
CREATE INDEXTYPE
ADMINISTER DATABASE TRIGGER
11 rows selected.
SQL> conn hr
Enter password:
Connected.
SQL> CREATE OR REPLACE TRIGGER set_after_logon AFTER LOGON ON DATABASE
     BEGIN
     execute immediate 'ALTER SESSION SET CURRENT_SCHEMA = SCOTT';
     END;
    /   2    3    4    5
Trigger created.
SQL> conn scott
Enter password:
Connected.
SQL> CREATE OR REPLACE TRIGGER set_after_logon AFTER LOGON ON DATABASE
     BEGIN
     execute immediate 'ALTER SESSION SET CURRENT_SCHEMA = HR';
     END;
    /   2    3    4    5
Trigger created.
SQL> conn scott
Enter password:
Connected.
SQL> set serverout on
SQL> exec dbms_output.put_line(SYS_CONTEXT('USERENV','CURRENT_SCHEMA'));
HR
PL/SQL procedure successfully completed.
SQL> conn hr
Enter password:
Connected.
SQL> set serverout on
SQL> exec dbms_output.put_line(SYS_CONTEXT('USERENV','CURRENT_SCHEMA'));
HR
PL/SQL procedure successfully completed.
SQL> select owner,trigger_name from dba_triggers where trigger_name like '%AFTER_LOGON%';
OWNER                          TRIGGER_NAME
SCOTT                          SET_AFTER_LOGON
HR                             SET_AFTER_LOGON
OWNER                          NAME                           TYPE               LINE TEXT
SCOTT                          SET_AFTER_LOGON                TRIGGER               1 TRIGGER set_after_logon AFTER LOGON ON DATABASE
SCOTT                          SET_AFTER_LOGON                TRIGGER               2      BEGIN
SCOTT                          SET_AFTER_LOGON                TRIGGER               3      execute immediate 'ALTER SESSION SET CURRENT_SCHEMA = HR';
SCOTT                          SET_AFTER_LOGON                TRIGGER               4      END;
HR                             SET_AFTER_LOGON                TRIGGER               1 TRIGGER set_after_logon AFTER LOGON ON DATABASE
HR                             SET_AFTER_LOGON                TRIGGER               2      BEGIN
HR                             SET_AFTER_LOGON                TRIGGER               3      execute immediate 'ALTER SESSION SET CURRENT_SCHEMA = SCOTT';
HR                             SET_AFTER_LOGON                TRIGGER               4      END;
8 rows selected.but.....
SQL> conn SYSTEM
Enter password:
Connected.
SQL> set serverout on
exec dbms_output.put_line(SYS_CONTEXT('USERENV','CURRENT_SCHEMA'));SQL>
HR
PL/SQL procedure successfully completed.
since it set at db level so it get fired for all user who login at db until you specify the condition in trigger for specific user

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

Create view and alter Session gets 0RA-01031

I can't create a view after using ALTER SESSION set current_schema without using an explicit schema. I get ORA-01031. Is this a known bug? Here are the details:
1. Log on as SYSTEM
2. ALTER SESSION set current_schema=FRED;
3. CREATE VIEW vFoo as select * from Foo; -- ORA-01031: insufficient privileges
4. CREATE VIEW FRED.vFoo as select * from Foo; -- this works!
I've read where some privileges need to be granted directly. In fact, if Fred grants select privilege on Foo to SYSTEM, the statement in #3 above works. However, something doesn't seem right because why does #4 succeed without the GRANT?
In case you're wondering why I don't just use #4 above, which does work, it's because I've got a script that will be run by customers to create tables, views, etc. in an arbitrary schema and the schema is associated with a user with limited permissions. Hence, the use of the ALTER SESSION.

See, You looged as SYSTEM (Scheme = SYSTEM)
Now you alter your session to another schema FRED.
Now if you want to access SCHEMA of FRED, You need to connect first.
SQL > connect user/password@host
Then
SQL > CREATE VIEW vFoo as select * from Foo;
View created.

Alter session set NLS_DATE_FORMAT and to_date not working

Hey folks,
for the sake of simplicity let's assume i want to get the current system time from the table dual in a certain format, e.g. 'YY.MM.DD'.
Currently the query
select sysdate from dual;
yields:
07-JAN-08
The desired output should look like this:
08.01.07
So, according to the manual, i tried the following:
alter session set NLS_DATE_FORMAT = 'yy.mm.dd';
No effect, date is still displayed as
07-JAN-08
Even the following query:
select TO_DATE (sysdate, 'yy.mm.dd') from dual;
yields
07-JAN-08
What am i doing wrong here?
Additional information:
-> DB is Oracle 9
-> I am using the Oracle SQL Developer under Ubuntu Gutsy
-> No, i did not forget to commit my commands....:-)
Any ideas?

select TO_CHAR (sysdate, 'yy.mm.dd') from dual;However the alter session command should work:
SQL*Plus: Release 9.2.0.2.0 - Production on Mon Jan 7 14:32:26 2008
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Connected to:
Oracle9i Enterprise Edition Release 9.2.0.8.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.8.0 - Production
SQL> alter session set NLS_DATE_FORMAT = 'yy.mm.dd';
Session altered.
SQL> select sysdate from dual;
SYSDATE
08.01.07
SQL> Note: There is nothing to commit here. Only selects, no DML.
Message was edited by:
Sven W.

Delivering serialized session or logon token to external web app?

Hello,
I have the following situation, the user logs into SAP BO 4.0 Launch pad application, he needs to start our external web application and therefore we created an hyperlink. The application opens in a new tab, that's running fine. Our application uses BO SDK to provide some functionality (browse user SAP folders, reports or so), and therefore we need to log in into the current user session.
Is there any way to deliver either the serialized session or logon token to external application? Are there any internal variables to be used? Or should I use totally different approach?
There would be a workaround by delivering just the current BO user name to the external app, and than using a separate (administrators) login to fetch only the current user's data. But this I guess is not the right way to do the job.
Any help is greatly appreciated

Hi Martin,
I am facing same situation than you and I also considered using the trusted authentication until I reads following statement in java docs
To enable trusted authentication on a client machine, create a text file named TrustedPrincipal.conf on the client machine and add the following text:
SharedSecret=<secret>
where <secret> is the trusted authentication shared secret configured in BusinessObjects Enterprise.
So, if the external web app may be launched from any user this would mean having to install this file in all BI LaunchPad desktop computers. It isn´t? This does not sound very elegant. Is this what you did?
Thanks

RMAN-10006: error running SQL statement: alter session set remote_dependenc

Backups are failing with following error
RMAN-00554: initialization of internal recovery manager package failed
RMAN-12001: could not open channel default
RMAN-10008: could not create channel context
RMAN-10002: ORACLE error: ORA-00096: invalid value SIGNATURE for parameter remote_dependencies_mode, must be from among MANUAL, AUTO
RMAN-10006: error running SQL statement: alter session set remote_dependencies_mode = signature
Not able to change to signature
SQL> alter session set remote_dependencies_mode=signature;
ERROR:
ORA-00096: invalid value SIGNATURE for parameter remote_dependencies_mode, must
be from among MANUAL, AUTO
I dont see MANUAL or AUTO as valid value for this parameter (http://download.oracle.com/docs/cd/B10501_01/server.920/a96536/ch1175.htm#1023124) DB version is 9.2.0
Parameter type
String
Syntax
REMOTE_DEPENDENCIES_MODE = {TIMESTAMP | SIGNATURE}
Default value
TIMESTAMP
Parameter class
Dynamic: ALTER SESSION, ALTER SYSTEM
=======================================
I believe it could be because of following bug
"A PRE-PATCHED ORACLE IMAGE CAN BE INSTALLED IN MEMORY "
Refer: "https://metalink2.oracle.com/metalink/plsql/f?p=130:15:1613505143885559758::::p15_database_id,p15_docid,p15_show_header,p15_show_help,p15_black_frame,p15_font:BUG,4610411,1,1,1,helvetica"
I appreciate your effort in fixing this issue.
Edited by: user10610722 on Nov 25, 2008 4:37 PM

Hi:
It seems when you are starting RMAN it's executing some commands (one 'ALTER SESSION...'. It's seems to be a batch which has a bad value for SORT_AREA_SIZE. Find it and modify to a proper value as message shows. If you can't find start RMAN by calling directly the executable ($ORACLE_HOME/bin/rman or %ORACLE_HOME%/bin/rman.exe).

Using ALTER SESSION inside a stored procedure.... not a good idea?

Hi,
I have two stored procedures, both of which are used to query a database to find a particular book, based on ISBN. One sproc searches our main product catalogue and the other searches our suppliers feed catalogues. The stored procedures are called from a C# application via a search tool and the user is able to search on either our catalogue or our suppliers. The appropriate procedure is called based on the users choices.
However, the following behaviour is observed
I search for an ISBN (is a varchar2 field, as isbn's may contain an X if the checksum digit equates to 10) on a feed, so uses the FEED SPROC. The book is found and returned to the app in about 0.5 seconds. I can repeat this as often as i like on different books etc. always works fine.
I then do the same search but against our own catalogue, so uses our CATALOGUE SPROC. Again the book is found quickly, and the search can be repeated with the same results.
If i then go back and run our FEED SPROC then the search time increases to about 3 minutes !
Both the feed and our catalogue is in the same database, although different schema's the connections will be pooled through our app server.
I can repliacte this every single time. I think i have narrowed doen the cause of this behaviour to a few lines of code in our CATALOGUE SPROC:
-- store values
select value into v_vch_NLS_COMP from nls_session_parameters nsp where nsp.parameter = 'NLS_COMP';
select value into v_vch_NLS_SORT from nls_session_parameters nsp where nsp.parameter = 'NLS_SORT';
-- Ensure case insensitivity throughout
EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_COMP = LINGUISTIC';
EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_SORT = BINARY_CI';
do other stuff
-- restore session variables
EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_COMP = ' || v_vch_NLS_COMP;
EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_SORT = ' || v_vch_NLS_SORT;
If i remove this code then all is well, so i am assuming that using ALTER SESSION inside a stored procedure is the cause of the problem as it would be changing the execution plan of the FEEDS SPROC in some manner? Any ideas? I know i can just rewrite the sproc to avoid using this coding, but wanted to understand if i am doing something wrong by using ALTER SESSION in this manner?
Any pointers would be appreciated.
John Thompson
Software Architect,
play.com
Edited by: user7186902 on 27-May-2009 03:51

Hello (and welcome),
It may be a case of having to create a linguistic index to facilitate the queries once you set these session level parameters, i.e..,
CREATE INDEX idx_01 ON tab ((NLSSORT(col1, 'NLS_SORT=BINARY_CI'))It would appear that the setting of those parameters is invalidating index searching on the current indexes.

Oracle Alter Session not working in CF9

Hello,
I'm trying to understand differences between CF5 and CF9 when I retrieve numbers and dates from an Oracle Database.
The code I ran on CF5 and CF9 servers :
<cfoutput>
<cftransaction>
<cfquery datasource="intranet">
alter session SET NLS_TERRITORY = FRANCE
</cfquery>
<cfquery name="qry" datasource="intranet">
select
     TO_NUMBER(12345/10) as nbr,
     sysdate as dt,
     TO_CHAR(1234.56,'L99G999D99') as cur
from dual
</cfquery>
</cftransaction>
#qry.nbr#<br>
#qry.dt#<br>
#qry.cur#
</cfoutput>
I've got those outputs :
Result in CF5
Result in CF9
1234,5
01/12/09
¿1.234,56
1234.5
2009-12-01 19:16:04.0
¿1.234,56
The first two rows in CF5 display data in French format. That's not the same for CF9, the data are in American format.
Then I changed the NLS_TERRITORY parameter
alter session SET NLS_TERRITORY = AMERICA
Result in CF5
Result in CF9
1234.5
01-DEC-09
$1,234.56
1234.5
2009-12-01 19:20:39.0
$1,234.56
The two first row haven't changed in CF9, it seems that the "alter session" has no effect on number and date format in query results. Is that a bug or am I misunderstanding something ?
Regards,
Maxime

Thank you for your reply.
I tried what you've suggested on the CF9 server.
The results are :
NLS_TERRITORY =
1) oracle JDBC database
2) oracle JDBC thin client
3) oracle JDBC-ODBC bridge
AMERICA
1234.5
2009-12-02 13:24:30.0
$1,234.56
1234.5
{ts '2009-12-02 00:00:00'}
$1,234.56
1234.5
2009-12-02 13:24:30.0
$1,234.56
FRANCE
1234.5
2009-12-02 13:29:53.0
¿1.234,56
1234.5
{ts '2009-12-02 00:00:00'}
¿1.234,56
1234.5
2009-12-02 13:29:53.0
¿1.234,56
The behavior is pretty much the same in the three differents ways to call the database. The only difference is on the date display using the Oracle JDBC thin client, which is another format from those I've already got.
Regards,
Maxime

"alter session set sql_trace true" in my pakage is not working

Hi
I have a package with some procedures..in one of my procedure which is executed in the first step i run the :
execute immediate 'alter session set sql_trace true';
this command is executed in debug mode and generate trace file(GOOD) but in running mode i haven't trcce file.
what is wrong in my code ?

http://download.oracle.com/docs/cd/E11882_01/server.112/e26088/statements_2013.htm#SQLRF00901 says parameter_name = parameter_value
Regards
Etbin

Execute immediate 'alter session set current_schema = ' failed in PL/SQL

Hi
I am trying to run
EXECUTE IMMEDIATE 'ALTER SESSION SET CURRENT_SCHEMA = TEST ' ;
in a pl/sql block but it is failing.Can anyone update me on this.
CREATE OR REPLACE PROCEDURE test3
IS
A_COUNT NUMBER(15);
BEGIN
EXECUTE IMMEDIATE 'ALTER SESSION SET CURRENT_SCHEMA = TEST ' ;
SELECT COUNT(*) INTO A_COUNT FROM (
select id from solutions );
END;
/

The user who owns the procedure needs to be granted direct select rights on table test.solutions (not via a role). Still will not help. Look what OP is trying to do. In a stored procedure owned by some user (other than TEST) OP is trying to reference user TEST owned table solution without prefixing it with owner. Something like:
SQL> create table u1.test_tbl(x number);
Table created.
SQL> select * from test_tbl;
select * from test_tbl
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> alter session set current_schema = U1;
Session altered.
SQL> select * from test_tbl;
no rows selected
SQL> However, OP tries to do it in a SP using dynamic SQL to change current schema to test. Such change will occur when SP will be executed, not when is it compiled. At compile time we are still under SP owner's schema and therefore select from solutions implies table solutions owned by SP owner, not by TEST. The only way to make SP compile and work OK is to select from solutions also dynamically:
SQL> select sys_context('userenv','current_schema') from dual
2 /
SYS_CONTEXT('USERENV','CURRENT_SCHEMA')
SCOTT
SQL> CREATE OR REPLACE PROCEDURE test3
2 IS
3 A_COUNT NUMBER(15);
4 BEGIN
5 EXECUTE IMMEDIATE 'ALTER SESSION SET CURRENT_SCHEMA = U1' ;
6 SELECT COUNT(*) INTO A_COUNT FROM (
7 select x from test_tbl );
8 END;
9 /
Warning: Procedure created with compilation errors.
SQL> sho err
Errors for PROCEDURE TEST3:
LINE/COL ERROR
6/1 PL/SQL: SQL Statement ignored
7/15 PL/SQL: ORA-00942: table or view does not exist
SQL> set serveroutput on
SQL> CREATE OR REPLACE PROCEDURE test3
2 IS
3 A_COUNT NUMBER(15);
4 c sys_refcursor;
5 BEGIN
6 EXECUTE IMMEDIATE 'ALTER SESSION SET CURRENT_SCHEMA = U1' ;
7 OPEN C FOR 'SELECT COUNT(*) FROM (select x from test_tbl )';
8 FETCH c INTO A_COUNT;
9 dbms_output.put_line(a_count);
10 CLOSE c;
11 END;
12 /
Procedure created.
SQL> insert into u1.test_tbl select rownum from emp;
14 rows created.
SQL> exec test3
14
PL/SQL procedure successfully completed.
SQL> Obviously, as you noted SP owner must have directly granted select on test3.solutions.
SY.

Alter session is not wofking

Hi All,
I have created process to alter session so I control the currency format, any way the process is working fine on the home page, but when visit another page or return to the home page the session value (currency format )will go back to previous setting ($). How can I keep this session consistent and fixed across my website?
Also when I change the order by for any report the currency format will be shown in older setting ($), I’m using PPR reports.
PS, when moving between pages the session state is same doesn't change. Also i have tried both application process and page process on new session and on page load.
Thanks,
Fadi.

Sorry to bother you with what should be a very stupid question.
I have tried to use the advice given to set the currency for my APEX application.
I used the VPD call in the security attributes tab for my application:
begin
execute immediate 'alter session set nls_territory=''FRANCE''';
execute immediate 'alter session set nls_currency=''€''';
end;
When applying the changes, the euro symbol (€) is set to a reverse question mark (¿)
I can think of a character set problem but no other clue.
Thanks in advance for any interest in my question,
Daniel

Preventing ALTER SESSION at logon?

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