SQL*Plus Error

[xiandao]

I'v installed ora7.3.2.2 in hpux 11.00
TNS(lsnrctl) listener started successfully
db started(dbstart) successfully

so I run sqlplus, but a error occured :
---------------------------------------------
ERROR:
ORA-00900: invalid SQL statement


Error accessing package DBMS_APPLICATION_INFO
ERROR:
ORA-00900: invalid SQL statement


Error accessing package DBMS_APPLICATION_INFO
You may need to install the Oracle Procedural option
SET APPINFO requires Oracle Server Release 7.2 or later
---------------------------------------------

why this happened?
How to install the Oracle Procedural option?
Pls help!

[twang]

Set the COMPATIBLE parameter in init.ora to the version of your Oracle Server. SQL*Plus issues a series of SQL statements in order to configure it's environment on startup. Some of this SQL may be incompatible with different builds of the Oracle server. Then retry the execution.

[twang]

In addition, do you add anything on "login.sql" if it exists?
Please verify that the procedural option is installed with the following SQL statement:
select * from v$version;

[xiandao]

1.Here is the result I run select * from v$version;
----------------------------------------
Oracle7 Server Release 7.3.2.2.0 - Production Release
Oracle7 Server Release 7.3.2.2.0 - Production Release
CORE Version 3.5.2.0.0 - Production
TNS for HPUX: Version 2.3.2.1.0 - Production
NLSRTL Version 3.2.2.0.0 - Production

2.the value of COMPATIBLE parameter I should write to init.ora is Oracle7 Server Release 7.3.2.2.0, right?

3. I heared need to run :
------------------------------
$sqldba lmode=y
SQLDBA>connect internal
SQLDBA>@catproc.sql
------------------------------
to install Oracle Procedural option

But I cannot find sqldba in $ORACLE_HOME/bin
Something I forget to install?

[twang]

If PL/SQL is not installed, get it from the base Oracle Server distribution CD-ROM. Otherwise, you need to re-link Oracle with the procedural option as follows:
% cd $ORACLE_HOME/rdbms/lib
% make -f ins_rdbms.mk procopt ioracle
Subsequently, you should run catalog.sql and catproc.sql as connect internal or as SYS.