If you have not used the data types timestamp with % timezone, then if you have DSTv16 in you 11g software aleady... $ORACLE_HOME/oracore/zoneinfo, then I was successful just upgrading the database with dbua, where during the process it suggests upgrading the database timezone using the DBMS_DST after dbua is finished. Seemed simpler to do it after. YMMV 1. If the Pre-Upgrade Information Tool instructed you to upgrade the time zone files after completing the database upgrade, then use the DBMS_DST PL/SQL package to upgrade the time zone file. a. Note 977512.1<https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=977512.1> Updating the RDBMS DST version in 11gR2 (11.2.0.1 and up) using DBMS_DST https://support.oracle.com/CSP/ui/flash.html#tab=KBHome(page=KBHome&id=()),(page=KBNavigator&id=(bmDocDsrc=KB&from=BOOKMARK&viewingMode=1143&bmDocTitle=Actions%20For%20DST%20Updates%20When%20Upgrading%20To%2011.2.0.1%20Base%20Release&bmDocID=815679.1&bmDocType=BULLETIN)) b. Note 977512.1<https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=977512.1> Updating the RDBMS DST version in 11gR2 (11.2.0.1 and up) using DBMS_DST (Different?) https://support.oracle.com/CSP/ui/flash.html#tab=KBHome(page=KBHome&id=()),(page=KBNavigator&id=(bmDocDsrc=KB&from=BOOKMARK&viewingMode=1143&bmDocTitle=Actions%20For%20DST%20Updates%20When%20Upgrading%20To%2011.2.0.1%20Base%20Release&bmDocID=815679.1&bmDocType=BULLETIN)) Joel Patterson Database Administrator 904 727-2546 From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Howard Latham Sent: Wednesday, August 24, 2011 7:33 AM To: ORACLE-L Subject: upgrade 10 to 11 10 + 11 RH Linux The upgrade from 10 to 11 doc seems to imply that you have to change some timezone files. Can I Ignore this is If have'nt used the TIMESTAMP Datatype- And .. Why do I get ORa-00723 Initialization parameter COMPATIBLE must be explicitly set When I startup upgrade WHEN I HAVE SET COMPATIBLE ? any Ideas? -- Howard A. Latham Sent from my Nokia N97