Identifying Server Queue Information

Server queue information controls the creation and access of server message queues. On a BEA Tuxedo system, you can create Multiple Server, Single Queue (MSSQ) sets by using the RQADDR parameter. For any given server, you can set this parameter to an alphanumeric value. By specifying the same value for RQADDR on all servers that offer the same services, you can consolidate those services under one message queue, thus creating an MSSQ set and establishing load balancing.

MSSQ Example

An MSSQ set is similar to a bank staff. Four tellers may be available to handle the business requests of many customers who wait in a single line. All customers are assured of an equitable wait in line. Understandably, a loan officer is not included in the group of tellers handling requests from customers in that line. The loan officer cannot handle requests for deposits and withdrawals (as the tellers can), and not all customers want loans. Similarly, a server cannot join an MSSQ set if the services it offers are not the same as the services offered by the servers in an MSSQ set.

The RQPERM parameter allows you to specify the permissions for server request queues, along the lines of the UNIX system convention (for example, 0666). This setting allows services to control access to the request queue.

If the service routines within an MSSQ server perform service requests, they must receive replies to their requests on a reply queue. You can set up such a reply queue by specifying REPLYQ=Y. By default, REPLYQ is set to N. If REPLYQ is set to Y, you can also assign permissions to it with the RPPERM parameter.

Characteristics of the RQADDR, RQPERM, REPLYQ, and RPPERM Parameters