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You can also type in the username/password combination when you invoke SQL*Plus, but your password will be visible to others when you do this. Here s an example: $ sqlplus salapati/sammyy1 SQL> The SQL prompt (SQL>) indicates that the SQL*Plus connection is initiated, and you can start entering your commands. Certain operations, such as startup and shutdown, are permitted only if you log into SQL*Plus with SYSDBA or SYSOPER credentials. If you have the SYSDBA (or the SYSOPER) privilege, you can log into SQL*Plus as follows: $ sqlplus sys/sys_passwd AS SYSDBA SQL> SHO USER USER is "SYS" SQL> The AS clause allows privileged connections by users who have been granted the SYSDBA or SYSOPER system privilege.

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In this scenario, managed code calls the managed function SampleClass::F2 with two transitions, not directly. This is another variant of the double-thunking problem. Since in C++ code, virtual functions are used more often than function pointers, double-thunking occurs more often in this context. To solve this problem, virtual functions of native classes can be defined with the managed calling convention __clrcall. By using this calling convention, you close the door for native callers managed callers, on the other hand, do not face the double-thunking problem. However, you should be aware that you can only avoid double thunking if you use __clrcall when you introduce the virtual function. It is not possible to overwrite a virtual function that has a native calling convention with a __clrcall function. For example, if a native class library defines the virtual function void __thiscall f(), you cannot provide the override void __clrcall f().

If you ve created an operating system authenticated user account (previously known as the OPS$name login; see 11) in your database, you can connect by simply using the forward slash (/), as shown here: $ sqlplus / SQL> SHO USER USER is "OPS$ORACLE" SQL> If you ve set up database authorization, you can also connect by including the Oracle software owner as part of the DBA group, as follows: $ sqlplus / AS SYSDBA SQL> SHO USER USER is "SYS" SQL> Notice that in all the preceding cases, we didn t have to use the database name when connecting through SQL*Plus That s because we were connecting to the default database the database indicated by the value of the ORACLE_SID environment variable You don t have to specify the database name when you use SQL*Plus to log into the default database.

If you wish to connect to a nondefault database that s accessible through your network, however, you must use a connection identifier or a net service name Theoretically speaking, you can connect to a database using the complete connection identifier syntax, as shown here, where you use the complete address for the database named orcl: $ sqlplus salapati/sammyy1@(DESCRIPTION = (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1521) (CONNECT_DATA= SERVICE_NAME=orclmycompanycom)) However, by using a net service name defined in the network file tnsnamesora, you can use a simpler way to connect to the orcl database, as shown here: $ sqlplus salapati/sammyy1@orcl You can also use the new easy connect method to connect to a database The easy connect method has the following syntax: $ [//]host[:port][/[service_name]] For our database, orcl, using the easy connect method, you can connect as follows: $ sqlplus hr/hr_passwd@sales-server:1521/orclmycompanycom Note that you don t need a network file (tnsnames.

ora) if you re using the easy connect method No matter which of these methods you use, you ll open a successful SQL*Plus session to either the default database or the database specified in your connection identifier..

This is a natural way to write a print_tree() function, because a tree is a recursive data structure. Each branch off the main trunk will either branch again or terminate. This continues until all branches terminate. In the case of the processes running on a system, the init process will have child processes, which will in turn have children or be terminal (childless) processes. This completes the loop and the function. It also completes the main code of the script itself, which, as discussed earlier, simply calls the main() function.

The SQL*Plus CONNECT command helps you connect as a different user, once you re logged in to SQL*Plus. You can also log in to a different database after you re connected to one database by using the CONNECT command. In the following example, I use the CONNECT command to connect as a different user while remaining in the same database: SQL> CONNECT newuser/newuser_passwd Connected. SQL>