I can confirm this. alter system set db_32k_cache_size=12M scope=memory; crashed my (test) database. Could only be opened with startup force. See below: alter system set db_32k_cache_size=12M scope=memory * FOUT in regel 1: .ORA-02097: Parameter kan niet worden gewijzigd omdat gespecificeerde waarde ongeldig is. ORA-00382: 32768 geen geldige blokgrootte, geldig bereik [..] SQL> exit Verbinding met Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, Oracle Label Security, OLAP, Data Mining and Real Application Testing options is verbroken. C:\LinuxRac>sqlplus system/xxxx@rhel5a/v1110 SQL*Plus: Release 11.1.0.6.0 - Production on Za Nov 22 22:02:52 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. ERROR: ORA-12537: TNS:verbinding is gesloten. Startup force required. .............. This is bad, needs to be fixed asap by Oracle. Regards, Andre From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Stefan Knecht Sent: zaterdag 22 november 2008 14:57 To: oracle-l Subject: Setting db_32k_cache_size breaks 11.1.0.7 Hello all I stumbled accross this today: oracle@m:~/ [M] sq SQL*Plus: Release 11.1.0.7.0 - Production on Sat Nov 22 14:55:03 2008 Copyright (c) 1982, 2008, Oracle. All rights reserved. Connected. idle> startup force; ORACLE instance started. Total System Global Area 2142679040 bytes Fixed Size 1314580 bytes Variable Size 1325400300 bytes Database Buffers 805306368 bytes Redo Buffers 10657792 bytes Database mounted. Database opened. idle> idle> Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options oracle@m:~/ [M] sqlplus system SQL*Plus: Release 11.1.0.7.0 - Production on Sat Nov 22 14:55:25 2008 Copyright (c) 1982, 2008, Oracle. All rights reserved. Enter password: Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options system@M> alter system set db_32k_cache_size=100m; alter system set db_32k_cache_size=100m * ERROR at line 1: ORA-02097: parameter cannot be modified because specified value is invalid ORA-00382: 32768 not a valid block size, valid range [..] system@M> Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options oracle@m:~/ [M] sqlplus system SQL*Plus: Release 11.1.0.7.0 - Production on Sat Nov 22 14:55:41 2008 Copyright (c) 1982, 2008, Oracle. All rights reserved. Enter password: ERROR: ORA-00382: %s not a valid block size, valid range [%s..%s] Could be pretty devastating if this happens to someone in production. You can't connect at all anymore, only thing that helps is a startup force... Filing SR :) Have a nice weekend Stefan ========================= Stefan P Knecht Senior Consultant Systems Engineering OPITZ CONSULTING Schweiz GmbH Seestrasse 97 CH-8800 Thalwil Mobile +41-79-571 36 27 stefan.knecht@xxxxxxxxxxxxxxxxxxx http://www.opitz-consulting.ch OCP 9i/10g SCSA SCNA =========================