Sun Java System Message Queue 4.1 Administration Guide

JDBC-Based Persistence

Instead of using file-based persistence, you can set up a broker to access any data store accessible through a JDBC-compliant driver. This involves setting the appropriate JDBC-related broker configuration properties and using the Database Manager utility (imqdbmgr) to create the proper database schema. See Configuring a JDBC-Based Store for specifics.

The properties for configuring a broker to use a JDBC database are listed in Table 14–6. You can specify these properties either in the instance configuration file ( of each broker instance or by using the -D command line option to the Broker utility (imqbrokerd) or the Database Manager utility (imqdbmgr).

The imq.persist.jdbc.dbVendor property identifies the database vendor being used for the persistent data store; all of the remaining properties are qualified by this vendor name. The imq.persist.jdbc.vendorName.driver property gives the Java class name of the JDBC driver to use in connecting to the database. There are also properties specifying the URLs for connecting to an existing database (imq.persist.jdbc.vendorName.opendburl), creating a new database (imq.persist.jdbc.vendorName.createdburl), and closing a database connection (imq.persist.jdbc.vendorName.closedburl).

The imq.persist.jdbc.vendorName.user and imq.persist.jdbc.vendorName.password properties give the user name and password for accessing the database, if required; imq.persist.jdbc.vendorName.needpassword is a boolean flag specifying whether a password is needed. For security reasons, the password should be specified only in a password file designated with the -passfile command line option; if no such password file is specified, the imqbrokerd and imqdbmgr commands will prompt for the password interactively. Similarly, the user name can be supplied from the command line using the -dbuser option to the imqbrokerd command or the -u option to imqdbmgr. If any additional, vendor-specific properties are required, you can set them by using broker properties of the form

In a JDBC database shared by multiple broker instances, the configuration property imq.brokerid specifies a unique instance identifier for each, to be appended to the names of database tables. (This is usually unnecessary for an embedded database, which stores data for only one broker instance.)

Besides setting all of the broker’s needed JDBC configuration properties, you must also install your JDBC driver’s .jar file in the appropriate directory location, depending on your operating-system platform (as listed in Appendix A, Platform-Specific Locations of Message Queue Data) and then execute the Database Manager command

   imqdbmgr create tbl

to create the database schema for the persistent data store.