Кстати вот еще оттуда-же:
The new 64 KB pages are preferred over 16 MB pages, and it is recommended that you use them instead of 16 MB pages on systems that support both page sizes. This is because 64 KB pages provide most of the benefit of 16 MB pages, without the special tuning requirements of 16 MB pages. If the memory is not properly tuned for 16 MB pages, the performance can be worse. On systems where 64 KB pages are not supported, you can use 16 MB pages, but carefully monitor the memory usage on these systems to make sure that memory is used properly. Users who want to consider 16 MB pages should discuss this with AIX support or IBM consultant.
В общем включать LOCK_SGA и юзать 64K страницы.
16М страницы — пережиток прошлого.