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For a developer to understand how to secure APEX, he or she must first understand the relationship between database sessions, APEX sessions, database users, and APEX users If you simply monitor the common columns in v$session such as USERNAME, SID, and SERIAL#, you might miss a lot of information that APEX provides about the session As you will see in the next example, APEX uses the MODULE, ACTION, CLIENT_INFO, and CLIENT_IDENTIFIER columns to expose as much information as possible about the APEX session associated with a particular database session MODULE indicates the APEX application number, ACTION is set to the current page number, CLIENT_IDENTIFIER is the username of the end user logged into the application followed by their APEX session ID, and CLIENT_INFO is the user s username This concept is called identity preservation These four columns are present in many of the SQL tuning views and reports such as V$SQL_AREA, ASH Reports, and ADDM Reports A number of techniques can use these columns, such as monitoring long-running sessions, fine-grained auditing (FGA) policies, or even part of a Virtual Private Database (VPD) policy We ll cover detailed examples of these techniques in the next chapter To illustrate the relationships between APEX sessions and database sessions, I ve constructed an example APEX application with four pages, each with a long-running operation so we have time to capture the database session with a query Pages one and three use the DBMS_LOCK SLEEP() procedure in a PL/SQL region to cause the page to hang for a specified period of time

2 Add the list of items, as shown in boldface here:

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The D layer is dense during daylight and vanishes at night This makes long-distance sky-wave propagation poor during the daytime and excellent at night on frequencies below about 7 MHz The D layer s disappearance at dusk is responsible for the dramatic change in the behavior of the AM broadcast band (535 kHz to 1 605 MHz) that occurs after sunset The E layer varies in density with the 11-year sunspot cycle The greatest ionization is during peak sunspot years (1979, 1990, 2001, etc) and the least is during slack years Solar flares cause the E layer to form dense regions that return radio waves to earth at frequencies as high as 100 MHz The E layer can produce communications over distances of hundreds or even thousands of miles The F layer returns radio waves at all frequencies up to a certain maximum, called the maximum usable frequency (MUF) The MUF varies depending on the sunspot cycle and also on day-to-day solar activity Reliable communications can usually be had up to about 7 MHz during the night and 15 MHz during the day when sunspot activity is minimum; this increases to perhaps 20 MHz at night and 50 MHz during the day when sunspot numbers are maximum All the ionospheric modes are called sky-wave propagation This is the mode responsible for worldwide shortwave communications and for nighttime AM broadcast reception over thousands of miles

11:

choose from list {"Mendocino", "Big Sur", "Las Vegas", "Cancun", "Tijuana"}

At frequencies above about 30 MHz, the lower atmosphere bends radio waves towards the surface (Fig 27-3) Tropospheric banding or tropo occurs because the index of refraction of air, with respect to EM waves, decreases with altitude The effect is similar to sound waves hugging the surface of a lake in the early morning, letting you hear a conversation a mile away Tropo makes it possible to communicate for hundreds of miles when the ionosphere will not return waves to the earth

Pages four and five use long-running queries to make sure the session is still active when I switch to SQL*Plus to query V$SESSION Note that APEX sessions are very short-lived, typically less than a second, which makes it difficult to capture session values For this example, I intentionally crafted procedures and queries that would take several minutes to run, thus allowing me to capture the session output for this example The following is the query and the results while running each of these pages in a new browser session:

3 Set a default item in the list, as shown in boldface here:

Another type of tropospheric propagation is called ducting It takes place when EM waves are trapped in a layer of cool, dense air sandwiched between two layers of warmer air Like bending, ducting occurs almost entirely at frequencies above 30 MHz Still another tropospheric-propagation mode is troposcatter This takes place because air molecules, dust grains, and water droplets scatter some of the EM field at very high and ultra-high frequencies (above 30 MHz)

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