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(in this example, the set of 8-bit characters) into a smaller set (that of the 7-bit characters). This is a lossy conversion the characters get modified because it is quite simply not possible to represent every character. But this conversion must take place. If the database is storing data in a single-byte character set but the client (say, a Java application, since the Java language uses Unicode) expects it in a multibyte representation, then it must be converted simply so the client application can work with it. You can see character set conversion very easily. For example, I have a database whose character set is set to WE8ISO8859P1, a typical Western European character set: ops$tkyte@ORA10G> select * 2 from nls_database_parameters 3 where parameter = 'NLS_CHARACTERSET'; PARAMETER VALUE ------------------------------ ---------------------------------------NLS_CHARACTERSET WE8ISO8859P1 Now, if I ensure my NLS_LANG is set the same as my database character set (Windows users would change/verify this setting in their registry) as follows: ops$tkyte@ORA10G> host echo $NLS_LANG AMERICAN_AMERICA.WE8ISO8859P1 then I can create a table and put in some 8-bit data. This data that will not be usable by a 7-bit client that is expecting only 7-bit ASCII data: ops$tkyte@ORA10G> create table t ( data varchar2(1) ); Table created. ops$tkyte@ORA10G> insert into t values ( chr(224) ); 1 row created. ops$tkyte@ORA10G> insert into t values ( chr(225) ); 1 row created. ops$tkyte@ORA10G> insert into t values ( chr(226) ); 1 row created. ops$tkyte@ORA10G> select data, dump(data) dump 2 from t; D DUMP - ------------------- Typ=1 Len=1: 224 Typ=1 Len=1: 225 Typ=1 Len=1: 226 ops$tkyte@ORA10G> commit; Now, if I go to another window and specify a 7-bit ASCII client, I ll see quite different results:

In order for a user to communicate with the database, he or she must first connect to the database by creating a user session. The user communication with the database is done through one of several interfaces. This section will quickly review Oracle database connectivity aspects and the main communication interfaces, including SQL*Plus, SQL Developer, and the OEM Database Control and Grid Control interfaces, which serve as the main DBA management consoles.

Rows Row Source Operation ------- --------------------------------------------------48243 SORT AGGREGATE (cr=145133 pr=0 pw=0 time=2334197 us) 57879 INDEX RANGE SCAN T_IDX_1 (cr=145133 pr=0 pw=0 time=1440672 us)(object ******************************************************************************** SELECT /*+ INDEX( t t_idx_2 ) */ COUNT(*) FROM T WHERE OBJECT_NAME = :B3 AND OBJECT_TYPE = :B2 AND OWNER = :B1

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You can connect to the Oracle database from the server on which the Oracle RDBMS is running. However, DBAs as well as application developers and users generally connect to the database through the network using Oracle Net, a component of Oracle Net Services. Oracle Net enables network sessions from a client application to an Oracle database server. It acts as the data courier for the clients and the database server, and it is in charge of establishing and maintaining the connection as well as transmitting messages between client and server. Oracle Net is installed on each computer in the network.

[tkyte@desktop tkyte]$ export NLS_LANG=AMERICAN_AMERICA.US7ASCII [tkyte@desktop tkyte]$ sqlplus / SQL*Plus: Release 10.1.0.4.0 - Production on Mon May 30 15:58:46 2005 Copyright 1982, 2005, Oracle. All rights reserved. Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.4.0 - Production With the Partitioning, OLAP and Data Mining options ops$tkyte@ORA10G> select data, dump(data) dump 2 from t; D DUMP - -------------------a Typ=1 Len=1: 224 a Typ=1 Len=1: 225 a Typ=1 Len=1: 226 Notice how in the 7-bit session I received the letter a three times, with no diacritical marks. However, the DUMP function is showing me that in the database there are in fact three separate distinct characters, not just the letter a. The data in the database hasn t changed just the values this client received. And in fact, if this client were to retrieve that data into host variables as follows: ops$tkyte@ORA10G> variable d varchar2(1) ops$tkyte@ORA10G> variable r varchar2(20) ops$tkyte@ORA10G> begin 2 select data, rowid into :d, :r from t where rownum = 1; 3 end; 4 / PL/SQL procedure successfully completed. and do nothing whatsoever with it, just send it back to the database: ops$tkyte@ORA10G> update t set data = :d where rowid = chartorowid(:r); 1 row updated. ops$tkyte@ORA10G> commit; Commit complete. then I would observe in the original 8-bit session that I have lost one of the original characters. It has been replaced with the lowly 7-bit a, not the fancy I had previously: ops$tkyte@ORA10G> select data, dump(data) dump 2 from t; D a DUMP -------------------Typ=1 Len=1: 97 Typ=1 Len=1: 225 Typ=1 Len=1: 226

Oracle Net Services is Oracle s mechanism for interfacing with the communication protocols (TCP/IP for example) that define the way data is transmitted on a network.

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