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Another improvement you can add to your application is to implement a session timeout facility. With such a facility, if authenticated users do not access a page in your application within a certain time period, their session will be deauthenticated, and they will be forced to authenticate again the next time they try to access a page that requires authentication. This will help to guard against a malicious user taking advantage of a trusted user s machine in the event that the user has stepped away for an extended period of time, leaving the browser open while logged in to your application. A submission to the Application Express Studio (currently at http://apex.oracle.com/ studio) entitled Automatic Session Timeouts by Scott Spadafore shows the steps needed to implement session timeouts in your application and also provides the code to perform the session timeout logic. The steps and code are summarized in this section, but do head over to the Application Express Studio and look at the original submission, as well as the many other submissions that have been made (and please feel free to submit some yourself, too!). 1. Create your application using whatever authentication scheme is appropriate. 2. Compile the supplied auth_pkg package code, shown in Listing 3-25. 3. Add a PL/SQL process to your login page that sends a cookie to the user s browser. 4. Modify your authentication scheme so that it makes a call to the auth_pkg.check_timeout function in the session verify function. Listing 3-25. Session Timeout auth_pkg create or replace package auth_pkg as -- literal 20 means 20 minutes; change as required l_max_idle_minutes constant pls_integer := 20; -- literal 101 means pag 101; change as required l_invalid_session_page constant pls_integer := 101; g_cookie_already_sent boolean := false;

Note that the CRSR namespace, which contains all cursors, does not require any remote locks. Thus, the LA lock and N pin are not used. A

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In single-instance Oracle, library cache locks on objects that a statement references are retained in null mode after the statement has been parsed. In the event of another process wishing to modify one of the referenced objects, the null-mode library cache locks allow dependent objects in the library cache to be identified and invalidated. In RAC, a more complex mechanism is required, because the object might be modified by a process in a different instance to the one holding the null lock. Therefore, in RAC, an invalidation (IV) instance lock is held on each instance by L K for each database object currently in the cache. If CO a process needs to modify an object definition, it can take an exclusive mode lock on the resource, which forces the L K processes to drop their shared lock and to implicitly invalidate all dependent CO objects. The IV lock type has two parameters: the first is the object number, and the second is a time stamp issued with the lock was created.

function check_timeout return boolean; end auth_pkg; / create or replace package body auth_pkg as function check_timeout return boolean as l_session_expire varchar2(256) := null; l_cookie_exists boolean := true; begin if htmldb_custom_auth.get_user is null then return true; end if; begin l_session_expire := owa_cookie.get('HTMLDB_IDLE_SESSION').vals(1); exception when no_data_found then -- no cookie set, assume first page visit after login l_cookie_exists := false; end; if l_cookie_exists and to_date(l_session_expire,'DD-MON-YYYY HH24:MI:SS') < sysdate then wwv_flow.g_unrecoverable_error := true; owa_util.redirect_url( 'f p='||wwv_flow.g_flow_id||':'||l_invalid_session_page); return false; elsif not g_cookie_already_sent then owa_util.mime_header('text/html', FALSE); owa_cookie.send( name => 'HTMLDB_IDLE_SESSION', value => to_char(sysdate+(l_max_idle_minutes/1440), 'DD-MON-YYYY HH24:MI:SS'), expires => null, path => '/', domain => null ); owa_util.http_header_close; g_cookie_already_sent := true; end if; return true; end check_timeout; end auth_pkg;

Each RAC instance has its own dictionary or row cache that is used to store elements of the data dictionary in the SGA in order to reduce the amount of physical I/O required when parsing statements. The data dictionary has the same structure in a RAC database as in a single-instance database. However, in a RAC database, the row caches are synchronized across all instances in the cluster. In a single-instance database, access to dictionary cache objects is controlled using implicit locking; in a RAC instance, access is controlled using global locks. Longtime Oracle users will remember that in Oracle 6.0 it was necessary to set initialization parameters that specified the size of each structure in the row cache. Since Oracle 7, these parameters have been managed automatically. However, the individual structures still exist and can be seen in the P R M T R column of the VR W A H view. You can also see these structures in the output of A A EE $O C C E a R WC C E dump: O _AH

ALTER SESSION SET EVENTS 'immediate trace name row^cache level 10';

This dump shows the current contents of the row cache. The cache ID is listed on thefirstline of each entry, for example:

You can alter the value of the l_max_idle_minutes and l_invalid_session_page variables to reflect your own preferences The PL/SQL process you need to add to the login page looks like the code in Listing 3-26 Listing 3-26 Setting a Session Idle Time declare l_max_idle_minutes number := 20; begin owa_cookiesend( name => 'HTMLDB_IDLE_SESSION', value => to_char(sysdate+(l_max_idle_minutes/1440), 'DD-MON-YYYY HH24:MI:SS'), expires => null, path => '/', domain => null ); end; You will need to adjust the l_max_idle_minutes value to correspond to any change you made to the same variable used in the pkg_auth package In this example, it is set to 20 to represent a timeout after 20 minutes.

row cache parent object: address=0x29a0b9bc cid=8(dc_objects)

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