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Now we use the MERGE command, as shown in Listing 6-12. Listing 6-12. The MERGE Command and Its Effect on the MASTER_TAB Table merge into master_tab m using delta_tab d on (m.pid = d.pid) when matched then update set m.sales = m.sales+d.sales , m.status = d.status delete where m.status = 'OBS' when not matched then insert values (d.pid,d.sales,'NEW'); 3 rows merged. select * from master_tab; PID SALES STATUS -------- -------- -----1 12 CURR 2 37 CURR 4 42 NEW In Listing 6-12, the first three command lines specify the roles of the two tables involved and the joining condition between the two tables. Lines 5, 6, and 7 specify what must be done when processing a row from the DELTA_TAB table if there is a matching row in the MASTER_TAB table. Line 9 specifies what must be done when such a matching row does not exist. Do you see what happened with the contents of the MASTER_TAB table

If you want to run on a TCP/IP port rather than a socket, you change the fastcgi_pass line to the following: fastcgi_pass 127.0.0.1:8987; The load-balancing solutions take the same form as for the proxy server configuration given in the HTTP::Prefork Engine Behind a Front-End Proxy section of this chapter.

The first row is not touched, because the DELTA_TAB contains no row for product 1. The second row is updated: the SALES value is incremented with 24, and the STATUS is set to CURR. The third (original) row is deleted, because after applying the UPDATE clause, the DELETE condition became TRUE. The fourth row is inserted, because there was no row for product 4.

s Note The word NOT is part of Concordance s list of stop words by default, so it s likely that the preceding

Usually for a low-traffic application deployed on FastCGI you ll want to spawn two or three processes. Working out what to do when traffic increases is a little more complex. Apache comes with a useful tool called ab that can simulate a load for requesting particular pages. Here s a command to make 100 requests with a maximum of 5 concurrent for a standard Catalyst application: $ ab -n 100 -c 5 http://127.0.0.1:3000/ You can use standard tools to then profile the memory usage during the time that your application runs. If you are getting too much CPU usage or memory use, you can adjust the parameters of your FastCGI back end as required. The disadvantage of ab is that you can request only a page at a time, and complex workflows can t be simulated. One solution to this is to write a script using WWW::Mechanize to simulate a workflow and then run a number of instances of the script concurrently to simulate.

All DML changes (INSERT, UPDATE, DELETE, and MERGE) that you apply to the contents of the database initially get a pending status. This means (among other things) that your session can see the changed rows, but other database users will see the original data when they query the same table rows. Moreover, as long as your changes are in this pending state, other database users will not be able to change those rows, until you confirm or abandon your pending changes. The SQL command to confirm pending changes to the database is COMMIT, and the command to abandon them is ROLLBACK. This allows you to perform a number of changes, then confirm them with a COMMIT or abandon them with ROLLBACK, then perform another number of changes, and so on. COMMITand ROLLBACK end the current transaction and start a new one. A transaction is considered to be a logical unit of work. In other words, a transaction is a set of changes that will succeed or fail as a whole.

You can nest words, phrases, and operators to facilitate more powerful searches. You separate groups of words and phrases by means of parentheses. Hence, the following search locates documents that contain either the word OLD or the word NEW directly adjacent to the word YORK; that is, documents that contain either OLD YORK or NEW YORK: (OLD OR NEW) YORK