GotoWorkspace in after Logon trigger

Our users want to switch automatically to the last workspace they use when they connect.  Because they can use one of several applications, I decided to put this feature in a logon after tripping on the database.

The trigger, the tables and procedures are owned by the user WM_UTILS:

----------------------------

create table wm_utils.recent_user_workspaces

(username varchar2 (30 bytes) primary key

nom_espace_de_travail varchar2 (30 byte));

create or replace procedure wm_utils.goto_last_workspace authid current_user as

pragma autonomous_transaction;

last_workspace varchar2 (30);

Start

last_workspace: = get_last_workspace();

If (last_workspace is not null) then

dbms_wm. GotoWorkspace (last_workspace);

end if;

commit;

end;

create or replace procedure wm_utils. set_last_workspace (workspace in varchar2) as

Start

merge into recent_user_workspaces

using double on (username = user)

When not matched then insert (username, nom_espace_de_travail) values (user, workspace)

when matched, then update set nom_espace_de_travail = workspace;

end;

create or replace function wm_utils. get_last_workspace return varchar2 as

workspace varchar2 (30);

Start

Select nom_espace_de_travail

in the workspace

of recent_user_workspaces

where username = user;

Returns the workspace;

exception

When NO_DATA_FOUND then

Returns a null value.

end;

create or replace procedure wm_utils.goto_workspace (workspace in varchar2) authid CURRENT_USER as

PRAGMA AUTONOMOUS_TRANSACTION;

Start

dbms_wm. GotoWorkspace (workspace);

set_last_workspace (Workspace);

commit;

end;

create or replace trigger wm_utils.on_login

After logon on database

Start

goto_last_workspace(); 

exception

while others then

null;

end;

------------------------------------------------------

Call wm_utils.goto_workspace instead of dbms_wm. GotoWorkspace if they want to remember their choice for their next login.

The problem is that this operation fails with the error "ORA-20073: sufficient privileges to ACCESS the workspace: 'TEST_WORKSPACE'."  It is a work space owned by the user attempting to log on, but there no privileges granted explicitly.  The user can call wm_utils.goto_last_workspace () to be identified and it works.  Y at - it something on the way in which work orders that would prevent from working in a trigger AFTER logon?

Hello

Triggers have the same privileges as a DEFINER procedure/function.  So, once the wm_utils.on_login trigger is executed when a user connects to the database, all the procedures performed as a result of the trigger are executed with the privileges of the wm_utils schema.  This includes even those defined as authid current_user, since at this moment in time wm_util is essentially the user that executes the procedure.  So, you can create a DEFINER rights procedure in the scheme of each user to manage dbms_wm of execution. GotoWorkspace which will remove the privileges of the user running, or give the privilege of system ACCESS_ANY_WORKSPACE wm_utils schema using dbms_wm. GrantSystemPriv.

Kind regards

Ben

Tags: Database

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    Hello world

    We had a problem with the index. A few months ago the client asked us to modify the application so that all searches are case insensitive and independent of diacritics (i.e. treat all non-ASCII as their equivalent ASCII - for example 'a' characters should be considered equal to 'a' etc.). We decided to create a simple LOGON trigger, which sets some parameters, NLS session for a given user (namely NLS_COMP = LINGUISTIC and NLS_SORT = CZECH_AI).

    This solution works, either it does what the customer has asked for, but I noticed there are problems with the index. Suddenly some of them are not used, so there is many unnecessary sequential scans of large tables (millions of rows), which influences the performance badly and that takes a lot more time. I believe that this is caused by the index created with the original, different from those current NLS parameters.

    Am I wrong? And how to fix it? I was able to recreate all the indexes, but is it possible to find what indexes are affected by this problem, or not?

    concerning
    Tomas

    I don't think your alter session modification statement will affect the content of the index, but they will have an impact of the plan. For example see the following example, where the full table Scan scan index range plan changes.

    SQL> select name from emp where name = 'a';

no rows selected

Execution Plan
----------------------------------------------------------
Plan hash value: 2061206800

-----------------------------------------------------------------------------
| Id  | Operation        | Name     | Rows  | Bytes | Cost (%CPU)| Time     |
-----------------------------------------------------------------------------
|   0 | SELECT STATEMENT |          |     1 |    12 |     1   (0)| 00:00:01 |
|*  1 |  INDEX RANGE SCAN| EMP_NAME |     1 |    12 |     1   (0)| 00:00:01 |
-----------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - access("NAME"=U'a')

Note
-----
   - dynamic sampling used for this statement (level=2)

SQL> alter session set NLS_COMP=LINGUISTIC;

Session altered.

SQL> alter session set NLS_SORT=CZECH_AI;

Session altered.

SQL> select name from emp where name = 'a';

no rows selected

Execution Plan
----------------------------------------------------------
Plan hash value: 3956160932

--------------------------------------------------------------------------
| Id  | Operation         | Name | Rows  | Bytes | Cost (%CPU)| Time     |
--------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |      |     1 |    12 |     3   (0)| 00:00:01 |
|*  1 |  TABLE ACCESS FULL| EMP  |     1 |    12 |     3   (0)| 00:00:01 |
--------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter(NLSSORT("NAME",'nls_sort=''CZECH_AI''')=HEXTORAW('14000100
              ') )

Note
-----
   - dynamic sampling used for this statement (level=2)

SQL>

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