what message comes in ur alert.log file ? because db_block_buffer parameter is deprecated in 9i by DB_CACHE_SIZE parameter. so my suggestion is instead of db_block_buffer , u use db_block_size parameter... = Also, DB_BLOCK_BUFFERS cannot be combined with the new dynamic = DB_CACHE_SIZE parameter; combining these parameters in the same parame= ter file will produce an error. DB_BLOCK_BUFFERS is retained for backward = compatibility. = = = = = Deepa Kale -DBA Jyoti Structures - Nasik(IT) = VuCanDo = <vuquyen@xxxxxxxx = m> = To Sent by: ASKDBA <askdba@xxxxxxxxxxxxx> = askdba-bounce@fre = cc elists.org = Subj= ect [askdba] DB_BLOCK_BUFFERS - HELP= 04-11-2004 07:58 = AM = = = Please respond to = askdba@freelists. = org = = = Hi Guys, I was increased the DB_BLOCK_BUFFERS from 0 to 4096. After shutdown and restart the database, this is what I got an errors. I need help to start up the database that run on NT Server running on Oracle 9.2.0.1 ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Thanks, Vu =