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Normally, many users and applications access database systems at the same time. This is known as concurrency. The RDBMS must make sure that concurrency is handled properly. The most drastic approach for a RDBMS would be to handle all user transactions one by one, blocking all data exclusively until the end of each transaction. Such a transaction serialization approach would result in unnecessary and unacceptable wait times; the overall system throughput would be very poor. RDBMSs like Oracle control concurrent data access with locking to prevent database users from updating rows with pending (uncommitted) changes from other database users. This section gives some information about how the Oracle RDBMS handles locking and concurrency.

If you know mod_perl already, you more or less know how to install a Catalyst application. On an Apache server with mod_perl compiled in (mod_perl needs to be compiled in; it isn t a loadable module like mod_proxy mentioned earlier), configuration is simple. For an application called MyApp located at /usr/local/lib/MyApp, a simple configuration is as follows: PerlSwitches -I/usr/local/lib/MyApp/lib PerlModule MyApp

Concordance s ability to assign data types to fields in a database allows you to retrieve records by comparing data in fields with fixed values. You can combine relational searches with other searches to locate documents that contain keywords and that have data that fits user-defined criteria.

To understand how the Oracle RDBMS handles locking, we need to identify a difference between two categories of database users: Readers: Users retrieving data (issuing SELECT statements) Writers: Users changing data (issuing INSERT, UPDATE, DELETE, and MERGE commands)

The Oracle RDBMS does not lock any data for retrieval. This means that readers never block readers. Moreover, this also means that writers never need to wait for readers, and vice versa.

<Location /> SetHandler modperl PerlResponseHandler MyApp </Location> You ll also want to serve static content directly: DocumentRoot /usr/local/lib/MyApp/root <Location /static> SetHandler default-handler </Location> Note the configuration semantics here are very similar to those of nginx. Deploying to a non-root location on the server is just as simple: PerlSwitches -I/usr/local/lib/MyApp/lib PerlModule MyApp

Data in Concordance databases is divided into separate fields. These fields are given specific data types that describe the data in those fields. A CDATE field might describe the creation date of a document, and be given a DATE data type. Describing the type of data that s contained in

Note The Oracle RDBMS s handling of data locking does not mean that readers and writers do not hinder each other in any way. Readers and writers can cause delays for each other by contending for certain system resources, such as CPU.

a field enables Concordance to perform comparisons more easily. You might want to locate records where CDATE contains date values that are at least 1/1/2003 but no later than 1/15/2003, and every record that contains CDATE values between those boundaries. These types of searches are fundamentally different from searches that locate documents on the existence of keywords. Keyword searches rely on Concordance s dictionary file to locate hits. No sort of comparison is required. Whereas keyword searches require a full index to be completed on the database being searched, relational searches of fields that have data types DATE, NUMBER, or TEXT (up to 60 characters, nonparagraph) don t require a full index. Scanning documents and converting the contents of those documents into digital characters is an automatic process. Scanning equipment is unable to make any sort of intelligent decision about what kind of document is being scanned, when the document was created, or who the author of the document might have been. These data elements require the evaluation of each document, and the direct intervention of a human who creates values or codes to represent properties of the documents. For this reason, fielded data in Concordance is often referred to as coded data. Searching coded data involves the use of comparison operators such as less than, greater than, contains, and outside limits. The section Relational Operators describes all the applicable operators.

<Location /myapp> SetHandler modperl PerlResponseHandler MyApp </Location> And again, for static content: DocumentRoot /usr/local/lib/MyApp/root <Location /myapp/static> SetHandler default-handler </Location> Add this to the appropriate part of the Apache configuration, restart the Apache server, and you re good to go. As we mentioned earlier, Apache is a large, complex, and flexible beast. mod_perl is doubly so, and it s usually overkill to deploy a Catalyst application with it, unless you actually want to do things to Apache s internal request handling for some reason. However, mod_perl is common in some production environments, and for this reason you may want to use it.