Hi all, I am facing a weird issue with sqlplus. DB connection through sqlnet works fine but when I just enter sqlplus username/passwd it errors out. Kindly let me know your inputs on this. When Connected directly: ********************** [oracle@oraapps2 dbs]$ echo $ORACLE_HOME /u02/db/tech_st/10.2.0 [oracle@oraapps2 dbs]$ echo $ORACLE_SID UPGR [oracle@oraapps2 dbs]$ sqlplus system/manager SQL*Plus: Release 10.2.0.3.0 - Production on Wed Jun 24 17:13:36 2009 Copyright (c) 1982, 2006, Oracle. All Rights Reserved. ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist Linux Error: 2: No such file or directory When Connected through listener: ************************************ [oracle@oraapps2 dbs]$ sqlplus system/system@UPGR SQL*Plus: Release 10.2.0.3.0 - Production on Wed Jun 24 17:14:34 2009 Copyright (c) 1982, 2006, Oracle. All Rights Reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production With the Partitioning, OLAP and Data Mining options SQL> Thanks, Kalyan ______________________________________________________________________ Disclaimer: This communication, along with any documents, files or attachments, is confidential, intended only for the use of the recipient(s) named above and may contain information that is legally privileged, attorney work product or otherwise exempt from disclosure under applicable law. If you are not the intended recipient(s) or have received this message in error, you are hereby notified that any dissemination, distribution or copying of any information contained in or attached to this communication is strictly prohibited; instructed to immediately notify the sender by return email or by a phone call to the sender; and required to delete this message from your computer. This communication does not form any contractual obligation on behalf of the sender, the sender's employer or such employer's parent company, affiliates or subsidiaries.