The recommended minimum swap space is at least 1GB. Certain operations may cause the memory usage to grow dynamically. Changing the way SAP Sybase IQ uses buffers can dramatically change the way it uses memory.
Depending on the load, swap requirements may exceed space allotted. Insufficient swap space may result in the system supporting fewer users, and large processes that cannot acquire sufficient swap space may be prematurely killed by the operating system.
See your operating system documentation for information about extending swap space.