That is a great paper, Mike ault also has done some research in this field. SSD is good for redo, temp and undo. I do not know how optimizer will handle other tablespaces. As currently the optimizer uses the single block read time and multiblock read time. And this will change if some tablespaces are on hard disks and others in SSDs. Joseph Amalraj jo_holvoet@xxxxxxxx wrote: The Oaktable has a paper on the subject by James Morle : http://www.oaktable.net/fullArticle.jsp;jsessionid=BF34334E604205A4F045F00ED217AE02?id=5 mvg/regards Jo "Luca Canali" .ch> To Sent by: "Oracle-L Freelists" oracle-l-bounce@f reelists.org cc Subject 09-03-06 10:16 Solid state disks for Oracle? Please respond to Luca.Canali@cern. ch Hi, Are 'solid state disks' a viable technology to build Oracle DBs, or are they still 'a niche'? I'd appreciate if anybody could share their experience or point me to recent literature (case studies) on the subject. Thanks, Luca -- //www.freelists.org/webpage/oracle-l -- //www.freelists.org/webpage/oracle-l