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| Last Published: 09/02/2009 |
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| <a name="Repositories"></a><div class="section"><h2>Repositories</h2> |
| |
| <p>James uses a number of different repositories to both store message data (email, news messages) and |
| user information. User repositories store user information, including user names, authentication |
| information, and aliases. Mail repositories store messages that have been delivered locally. Spool |
| repositories store messages that are still being processed. Finally, news repositories are used to |
| store news messages.</p> |
| |
| </div> |
| <a name="Storage Types"></a><div class="section"><h2>Storage Types</h2> |
| |
| <p>Aside from the type of data they store, repositories are distinguished by |
| where they store data. There are three types of storage - File, Database, and DBFile.</p> |
| <a name="File Repositories"></a><div class="section"><h3>File Repositories</h3> |
| |
| <p>File-based repositories store all data in the file system. In general, these repositories are extremely |
| simple to configure, but may compare poorly in terms of performance when compared to other repository |
| types. File repositories are not recommended for large or performance-critical configurations. In the |
| default configuration, all repositories are file repositories.</p> |
| |
| <p>File repository paths typically begin with the prefix "file". Paths are relative to the application |
| base directory, unless the path begins with a slash. As an example, assume that James is running in |
| /usr/james/phoenix/apps/james. Then "file://var/mail/spool/" would refer to the directory /usr/james/phoenix/apps/james/var/mail/spool. |
| And "file:///var/mail/spool/" (note the extra '/') would refer to the directory /var/mail/spool.</p> |
| |
| <p>All repository types (mail, spool, user, and news) have file-based implementations. No special configuration is required to enable file-based repositories</p> |
| |
| </div> |
| <a name="Database (JDBC) Repositories"></a><div class="section"><h3>Database (JDBC) Repositories</h3> |
| |
| <p>Database repositories store all data in an administrator-supplied database. Configuration is somewhat |
| more complex, requiring that the administrator adjust the data-connections section. Detailed directions |
| are included in the sample configuration file. The administrator will need to know the JDBC driver class, |
| the appropriate URL for use with his database, and a valid username/password for the database.</p> |
| |
| <p>If the administrator wants to configure a database other than MySQL, it will be necessary to add the jar |
| or zip file containing the JDBC driver classes to the lib subdirectory of the installation directory. This |
| will allow Phoenix to properly load the driver when it is initializing the database repository. The MySQL |
| driver is pre-packaged with James.</p> |
| |
| <p>Database repository paths typically begin with the prefix "db". The format is "db://<data-source>/<table>" |
| where <data-source> is the name of the data-source defined in the data-connections section. And <table> is |
| the particular table associated with the repository.</p> |
| |
| <p>Mail, spool, and user repositories have JDBC-based implementations.</p> |
| |
| </div> |
| <a name="DBFile Repositories"></a><div class="section"><h3>DBFile Repositories</h3> |
| |
| <p>This is a special repository type used only for mail repositories. DBFile repositories store the body of |
| a mail message in the file system, while headers are stored in the database. This allows the administrator |
| to minimize the size of data stored in the database, while conserving most of the performance of the |
| database repository.</p> |
| |
| <p>Only mail repositories have dbfile-based implementations.</p> |
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