ASP.NET PDF Viewer using C#, VB/NET

The V$LOG view gives detailed information about the size and status of the redo logs, as well as showing whether the logs have been archived: SQL> SELECT group#, sequence#, bytes, archived, members, status 2* FROM V$LOG; GROUP# SEQUENCE# BYTES ARCHIVED MEMBERS STATUS ---------- ---------- ---------- --- ---------- ------------1 8 104857600 NO 1 INACTIVE 2 10 104857600 NO 1 CURRENT 3 7 104857600 NO 1 INACTIVE 4 9 10485760 NO 3 INACTIVE SQL>

onbarcode excel barcode add in, free qr barcode font for excel, free excel 2d barcode font, how to make barcodes in excel free, how to make barcodes in excel 2003, free barcode add-in excel 2007, how to generate 2d barcode in excel, free barcode for excel 2007, free excel ean barcode font, excel 2010 barcode control,

A database link enables a one-way connection to a remote database from a local database. The link is one way only. The remote database users can t use this link to connect to the local database they must create a separate database link for that. A database link allows you to gain access to a different database though a remote database user account; you don t have to be a user in the remote database. Your privileges on that database will be identical to the privileges of the user account you use when creating the database link. Database links are useful when you want to query a table in a distributed database or even insert data from another database s table into a local table. Database links allow users to access multiple databases as a single logical database. You can create private and public database links. In the following sections, we ll look at examples of how to create both types of database links.

The text ^C and ^ are each considered single control characters. To insert these correctly in the script on your system while using vi, start by typing Ctrl+v and then the desired key sequence. The Ctrl+v sequence tells vi to ignore the actual usage of the next key sequence typed (Ctrl+c, Backspace, Enter, etc.) and insert it as a control character instead. The Ctrl+v sequence thus works somewhat like an escape character. For example, to input the ^ character for a backspace, in vi you would be in insert mode, press Ctrl+v, and then press the Backspace key. Now the script starts an endless loop that accepts the user s input specifying remote system names or IP addresses.

A private database link is owned by the user that creates the link. In the following statement, the SYSTEM user creates a private database link. The database link enables a connection to the remote database using the hr user s username and password in that database. SQL> CONNECT system/system_passwd@monitor Connected. SQL> SQL> CREATE DATABASE LINK MONITOR 2 CONNECT TO hr IDENTIFIED BY hr 3 USING 'monitor.world'; Database link created. SQL> After the link is created, the SYSTEM user can query the hr.employees table in the remote database.

To create a database link, a user must have the CREATE PRIVATE DATABASE LINK privilege or the CREATE PUBLIC DATABASE LINK privilege in the local database.

In the preceding statement, note that the database link s name is MONITOR, which is the same as the remote database s TNS name alias (Oracle Net Service alias), but it could be anything you want. The CONNECT TO . . . IDENTIFIED BY clause means that the user of this database link will use that username and password to enter the remote database. The USING 'monitor.world' clause simply specifies the TNS name alias for the linked remote database. Because this is a private database link, only the SYSTEM user can use it. When the hr user tries to use this link to a remote database, this is what happens: SQL> CONNECT hr/hr; Connected. SQL> SELECT count(*) FROM hr.employees@monitor; select count(*) from hr.employees@monitor * ERROR at line 1: ORA-02019: connection description for remote database not found SQL>

A public database link, unlike a private database link, enables any user or any PL/SQL program unit to access the remote database objects. The creation statement is very similar to that for a private database link. You just add the PUBLIC keyword to the CREATE DATABASE LINK statement: SQL> connect system/system_passwd as sysdba; Connected. SQL> CREATE PUBLIC DATABASE LINK MONITOR 2 CONNECT TO hr IDENTIFIED BY hr 3 USING 'monitor.world'; Database link created. SQL>