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For the sake of this example, let s assume that the Web server hits capacity first. It s easy to get multiple copies of a Django site running on different hardware just copy all the code onto multiple machines, and start Apache on both of them. However, you ll need another piece of software to distribute traffic over your multiple servers: a load balancer. You can buy expensive and proprietary hardware load balancers, but there are a few high-quality open source software load balancers out there. Apache s mod_proxy is one option, but we ve found Perlbal (http://www.djangoproject.com/ r/perlbal/) to be simply fantastic. It s a load balancer and reverse proxy written by the same folks who wrote Memcached (see 13).

SET {LINESIZE|PAGESIZE|NEWPAGE} SET TRIMSPOOL ON COLUMN TTITLE, BTITLE REPHEADHER, REPFOOTER BREAK COMPUTE SPOOL

As Joe types in his password (which happens to be 111, the first three digits of his social security number), asterisks (*) appear in place of the characters that he types to ensure his privacy.

Note If you re using FastCGI, you can accomplish this same distribution/load-balancing step by separating your front-end Web servers and back-end FastCGI processes onto different machines. The front-end server essentially becomes the load balancer, and the back-end FastCGI processes replace the Apache/ mod_python/Django servers.

After typing in his password, Joe presses the Enter key. Unfortunately, Joe has mistyped his password, and so the following pop-up message appears:

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Adjust the page setup; set to 0 suppresses page formatting Suppress trailing spaces in SPOOL output Adjust column layouts (header and contents) Define top and bottom page titles Define report headers and footers Group rows (make sure the result is ordered appropriately) Add aggregate computations on BREAK definitions Spool SQL*Plus output to a file

After Joe clicks the OK button on this pop-up to dismiss it, he clicks in the SSN: field to give that field focus, and then presses the Enter key again to redisplay the password pop-up a second time (he needn t retype his SSN, however). Assuming that he types his password correctly this time, he receives this confirmation of a successful logon:

With the Web servers now clustered, our evolving architecture starts to look more complex, as shown in Figure 20-4.

The SQL*Plus SET command was introduced in Section 11.1, in the discussion of SQL*Plus system variables. Now we ll look at the other SQL*Plus commands that are useful for producing reports.

After clicking OK on this confirmation pop-up, Joe sees that the Name:, Total Courses:, and Registered For: components on the main GUI window have been filled in with his current registration information. (Although Joe doesn t know it, this information was read in behindthe-scenes from file 111-11-1111.dat, courtesy of the SRS data access layer.) We see that Joe had previously used the SRS to register for section 1 of course number CMP101. Notice that two of the buttons at the bottom of the GUI Save My Schedule and Log Off have now become enabled, as you can see here:

Joe decides to enroll in section CMP101 - 2. He clicks this section in the Schedule of Classes list to highlight/select it, which causes the Add button at the bottom of the screen to automatically become active. Joe clicks the Add button.

Notice that in the diagram the Web servers are referred to as a cluster to indicate that the number of servers is basically variable. Once you have a load balancer out front, you can easily add and remove back-end Web servers without a second of downtime.

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