I'm not sure what the problems is - maybe you have another Oracle instance or something else also using large pages? You can use svmon to get more detail about what is using the large pages but I would recommend just not using large pages anymore. With Oracle 10.2.0.4+ you can use the newer and easier-to-manage "medium" (64K) pages as instructed and recommended by IBM here (and also mentioned in MOS Doc ID 968113.1): http://public.dhe.ibm.com/partnerworld/pub/whitepaper/162b6.pdf "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." Just beware of the bug described in MOS Doc ID 1088076.1 I used to use large pages (only or the SGA, not for .text and .data) and they worked fine for years, but I've been using the newer medium pages for the last year or so and haven't had any problems. Regards, Brandon ________________________________ Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.