Simple .NET/ASP.NET PDF document editor web control SDK

In the following example, I connect to a different database from within SQL*Plus by providing the connect identifier as part of the CONNECT command: SQL> CONNECT salapati/sammyy1@orcl Connected. SQL> Just make sure that you have the remote database connection information in your tnsnames.ora file before connecting to the different database. You can use the CONNECT command from within SQL*Plus with the / AS SYSDBA and / AS SYSOPER syntax, as shown here: CONNECT / AS SYSDBA CONNECT username/password AS SYSDBA CONNECT / AS SYSOPER CONNECT username/password AS SYSOPER

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You can also start a SQL*Plus session without connecting to a database by using the /NOLOG option with the sqlplus command when starting a new SQL*Plus session. You may do this, for example, when you re starting the database, or if you just want to use SQL*Plus editing commands to write or edit scripts. Once the SQL*Plus session starts, you can connect to a database using the CONNECT command. Here s an example using the NOLOG option: $ sqlplus /NOLOG SQL*Plus: Release 10.2.0.0.0 - Beta on Sun Mar 6 11:50:42 2005 Copyright (c) 1982, 2004, Oracle. All rights reserved. SQL> SHO USER USER is "" SQL> SHO SGA SP2-0640: Not connected SQL> CONNECT salapati/sammyy1 Connected. SQL>

So far, I have only mentioned that calls via thunks are slower than method calls that do not cross a managed-unmanaged boundary. To decide whether the overhead of a transition is acceptable or not, you will likely need more precise information. The next sections explain the overhead of the different transitions. I will especially examine transitions based on interoperability vtables, P/Invoke metadata, and the CALLI instruction. Furthermore, I will discuss how to use a special optimization option for P/Invoke metadata and certain internal aspects of managed-unmanaged thunks that can affect the way you write code. To discuss the overhead of transitions, I have written an application that measures different interoperability scenarios. The code for this application is provided in Appendix B. You can also download it from the Source Code/Download section of the Apress web site (www.apress. com/) so that you can reproduce the performance tests on your machine or adapt them to your own special scenarios. To determine the performance of thunks for C functions, the application uses a native and a managed global function defined in the application itself (fManagedLocal and fNativeLocal), as well as a native and a managed function imported from an external DLL (fManagedFromDLL and fNativeFromDLL). The application measures how long it takes to call each of these methods directly, as well as via function pointers from native and managed code. For each measurement, 100 million calls are done. Table 9-2 shows the measured results on my machine (Pentium M 780, 2.26 GHz).

If you are using the SQL*Plus GUI on a Windows machine, click the SQL*Plus icon and the interface will prompt you for your username, password, and the instance name. As long as your connection to the database is established through the proper entries in the tnsnames.ora file (see 11 for more information on this file), you are all set to use the SQL*Plus interface. Alternatively, you can start the SQL*Plus Windows GUI with the following command at the operating system level, on a Windows server: $ sqlplusw You can also start the SQL*Plus GUI on a Windows server by directly typing in either the username/password for a local database, or the username/password along with the client identifier for a remotely located database, as shown here: $ sqlplus system/system_passwd@orcl

The process-tree script is interesting in its design, but it isn t particularly useful as a script because not all systems can run it, and those that can (mainly standard Linux systems using bash) already have a command that performs the same task. The following version of the script is more portable and it can be run using either bash or ksh. I ve made very limited commentary on the code, as it is essentially the same as that of the previous script.