While the database server is online, it allows you to start and stop VPs that belong to certain classes. You can use onmode -p or IBM Informix Server Administrator (ISA), or ON–Monitor to start additional VPs for the following classes while the database server is online: CPU, AIO, PIO, LIO, SHM, TLI, and SOC. You can drop VPs of the CPU class only while the database server is online.
You should carefully distinguish between poll threads for network connections and poll threads for shared memory connections, which should run one per CPU virtual processor. TCP connections should only be in network virtual processors, and you should only have the minimum needed to maintain responsiveness. Shared memory connections should only be in CPU virtual processors and should run in every CPU virtual processor
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