Page sets and buffer pools

 

Dynamically add or remove buffers in an existing buffer pool

WebSphere MQ V6 now allows you to dynamically add more buffers to a buffer pool, if the pool is too small. The new command is ALTER BUFFPOOL. See the WebSphere MQ Script (MQSC) Command Reference for more information about this command.

 

Large page sets

Large page sets of greater than 4GB in size provide extra capacity for messages, for example if the network stops. These can now be created on WebSphere MQ V6, if required. Because the throughput of the system is not affected, the existing logs and buffer pools provide adequate support. For more information, see Storage management.

 

Page set expansion

Page set expansion has been improved. A page set is expanded before it becomes full, and the expansion is performed asynchronously from the MQPUT command. The new secondary extent of the page set increases in line with the size of the page set. Page set definitions that specify no secondary extent size are still expandable, whereas previously the expansion failed. The DEFINE PSID and ALTER PSID commands have been extended to support this feature.

For information about enabling page set expansion, see WebSphere MQ for z/OS Concepts and Planning Guide.

For information about the DEFINE PSID and ALTER PSID commands, see WebSphere MQ Script (MQSC) Command Reference.