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Note The Oracle DBMS also allows you to define autonomous transactions using PL/SQL. These are subtransactions that you can COMMIT or ROLLBACK independently from their main transactions. See PL/SQL User s Guide and Reference for details.

Catalyst should run on any other web server that supports FastCGI, with the proviso that you ll have to check that the environment variables passed to the FastCGI process are what Catalyst expects. One final note on this: when you re choosing a web server not in this list, investigate its reverse proxy support and FastCGI process management support.

For example, account transfer transactions in a banking system normally consist of (at least) two updates: a debit to account A and a credit to account B. In such situations, it makes a lot of sense to COMMIT after each debit/credit combination, and not in between each update. What if something went wrong (for example, the system crashed) after the debit update was committed but the credit update had not been processed yet You would end up with corrupted administration records. Moreover, even in the absence of any disasters, a different database user could start a reporting application precisely at the wrong moment in between the two updates, which would result in inconsistent financial reports. On the other hand, if you wait too long before committing your changes, you risk losing your work when the system crashes. During system .recovery, all pending transactions will be rolled back to guarantee database consistency. This may be annoying, but it s necessary. By the way, this illustrates the fact that not only database users are able to issue explicit COMMIT and ROLLBACK commands. Oracle tools can also issue those commands implicitly. For example, if you leave SQL*Plus in a normal way with the EXIT or QUIT command, or if you create a new session with the SQL*Plus CONNECT command, SQL*Plus first sends a COMMIT command to the database. Another consequence of a delayed committing of your changes is that you block other database users who want to update or delete the same rows. Section 6.6 discusses this locking behavior in a little more detail.

s Note Recall that the ADJ0 operator is assumed when no operator is explicitly given between search

Although it is very powerful, mod_perl is an old technology, and back in the day (between around 1997 and the birth of modern web framework technology in the early twenty-first century) it was really the only way to get a persistent Perl interpreter running on your system. If you re new to this and don t have any legacy reason to do so, we suggest that you don t use mod_perl, and instead use one of the other techniques for deployment outlined in this chapter. mod_perl is pretty easy to configure for the simple instance, but it can get complex and is relatively memory-thirsty. If you make changes to your application, it also requires a full server restart, which can be inconvenient and almost always requires superuser privileges.

All DDL commands (such as CREATE, ALTER, DROP, GRANT, and REVOKE) always imply an implicit COMMIT. To put it another way, each single DDL command is executed as a transaction in itself, consisting of a single command, and is committed immediately.

Formally, you could write the preceding search as follows: (OLD OR NEW) ADJ0 YORK You could also write it as follows: (OLD YORK) OR (NEW YORK) Or you could write it as follows: (OLD ADJ0 YORK) OR (NEW ADJ0 YORK) This last example (OLD ADJ0 YORK) OR (NEW ADJ0 YORK) is the most explicit form of this search, and is the easiest for you to interpret. Subnesting search words and phrases and operators is allowed. Hence, the following search locates documents that contain either OLD YORK, NEW YORK, OLD MEXICO, or NEW MEXICO: ((OLD ADJ0 YORK) OR (NEW ADJ0 YORK)) OR ((OLD ADJ0 MEXICO) OR (NEW ADJ0 MEXICO))