crystal reports barcode font formula Connecting by Using the CONNECT Command in Font

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Connecting by Using the CONNECT Command
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The SQL*Plus CONNECT command helps you connect as a different user, once you re logged into SQL*Plus. You can also log into 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: SQL> CONNECT newuser/newuser_passwd Connected. SQL> 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 CONNECT CONNECT CONNECT CONNECT sys/sammy1@prod1 as sysdba / AS SYSDBA username/password AS SYSDBA / AS SYSOPER username/password AS SYSOPER
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CH APT ER 4 US ING SQ L*PLUS AN D O RA CLE E NTE RPR IS E MA NAGE R
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Connectionless SQL*Plus Session with /NOLOG
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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 11.1.0.6.0 - Production on Wed Jan 2 18:35:25 2008 Copyright (c) 1982, 2007, Oracle. All rights reserved. SQL> SHO USER USER is " " SQL> SHO SGA SP2-0640: Not connected SQL> CONNECT salapati/sammyy1 Connected. SQL>
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Connecting to SQL*Plus Through a Windows GUI
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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. 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. You can use the SQL*Plus utility in both manual and scripted noninteractive modes. It stands to reason that you would want to perform sensitive administration tasks, such as database recovery, in an interactive mode. On the other hand, you can automate routine processing of SQL with scripts, and your SQL commands will then run noninteractively. In either case, the commands are the same it is just the mode in which you issue the commands that is different. The SQL*Plus connect command has the following syntax: CONN[ECT] [{ logon | / } [AS {SYSOPER | SYSDBA | SYSASM}]]
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In Oracle Database 11g, the SQLPLUS command has a new -F argument to enable SQL*Plus to receive Fast Application Notification (FAN) events from a RAC database.
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You can connect as a user with the SYSOPER, SYSDBA, or SYSASM privileges to perform privileged operations such as shutting down the database and starting it or backing up and recovering the database. The SYSASM privilege is new in Oracle Database 11g and is meant as a device to separate normal database administration and Automatic Storage Management (ASM) tasks. You ll learn more about the SYSASM system privilege in 17, which discusses ASM.
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Operating in SQL*Plus
Once you re logged into the SQL*Plus interface, you can type in any SQL*Plus, SQL, or PL/SQL commands. As explained later in this chapter, a SQL statement is terminated by a semicolon (;) or a
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slash (/), and a PL/SQL code block is terminated by a slash (/). You can see the output on the screen, and you can also spool it to a file if you wish. A SQL*Plus command is always terminated by a newline character. If you enter a SQL*Plus command, the SQL*Plus client program will handle it, and if it s a SQL or a PL/SQL statement, it s sent on to the database server for processing. You can use the hyphen (-) as a continuation character, although it s not necessary to use a continuation character when you finish the first line. You can type an arbitrary number of characters or words in each SQL line and just press the Enter key to continue on the next line. SQL*Plus will automatically number each line. In some cases, however, the continuation character (-) comes in handy. In the next example, I m trying to enter the SQL statement, SELECT 200 - 100 FROM dual: SQL> SELECT 200 > 100 from dual; 100 from dual * ERROR at line 1: ORA-00923: FROM keyword not found where expected SQL> In the preceding example, when I started the second line after the hyphen (-), which is also the minus sign, SQL*Plus automatically interpreted it as the continuation character and issued an error because the statement was syntactically incorrect (select 200 100 from dual). You can avoid this problem by using a second hyphen (minus sign) at the end of the first line as a continuation character. SQL> SELECT 200 - > 100 FROM dual; 200-100 ---------100 SQL> The dual table is necessary in Oracle so as to enable certain queries, since in Oracle s SQL, you must use the FROM clause in a SELECT statement (for example, SELECT sysdate FROM dual;). Microsoft SQL Server database, on the other hand, doesn t use a dual table because you can have a SELECT statement without a FROM clause in SQL Server. select 200
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