Sun GlassFish Enterprise Server 2.1 Deployment Planning Guide

HTTP Session Persistence Frequency

The number of requests per minute received by the HADB depends on the persistence frequency. Persistence Frequency determines how often Enterprise Server saves HTTP session data to the HADB.

The persistence frequency options are:

The following table summarizes the advantages and disadvantages of persistence frequency options.

Table 2–1 Comparison of Persistence Frequency Options

Persistence Frequency Option 




Guarantees that the most up-to-date session information is available. 

Potentially increased response time and reduced throughput. 


Better response time and potentially better throughput. 

Less guarantee that the most updated session information is available after the failure of an application server instance.