Refer to AskTom: http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1590999000346302363 Tom Kyte said: I would not use the keep pool, the default buffer cache is almost certainly better than good enough. The keep buffer would definitely be in the SGA, it is just another buffer cache. What do you think? Do you use KEEP Buffer Pool in your production system? -- Kamus <kamusis@xxxxxxxxx> Oracle8i & 9i Certified DBA from China Oracle ACE Visit my blog for more article: http://www.dbform.com