The -iqsmem switch for shared memory allocation now supports values greater than 512MB on 64-bit IBM AIX platforms. The maximum supported limit for a single shared memory segment on AIX-64 increased from 256MB to 32TB. Adjusting this switch results in a significant performance increase.
Set the -iqsmem switch to a value which is exactly equal to the sum of IQ_SYSTEM_MAIN (dbname.iq) and IQ_SYSTEM_TEMP (dbname.iqtmp) buffer cache sizes. Do not set this switch to another value.