Oracle Consulting Oracle Training Development

Remote DBA

Remote DBA Plans  

Remote DBA Service

Remote DBA RAC

   
Remote DBA Oracle Home
Remote DBA Oracle Training
Remote DBA SQL Tuning Consulting
Remote DBA Oracle Tuning Consulting
Remote DBA Data Warehouse Consulting
Remote DBA Oracle Project Management
Remote DBA Oracle Security Assessment
Remote DBA Unix Consulting
Burleson Books
Burleson Articles
Burleson Web Courses
Burleson Qualifications
Oracle Links
Remote DBA Oracle Monitoring
Remote DBA Support Benefits
Remote DBA Plans & Prices
Our Automation Strategy
What We Monitor
Oracle Apps Support
Print Our Brochure
Contact Us (e-mail)
Oracle Job Opportunities
Oracle Consulting Prices





   

 

 

 

Remote DBA services

Remote DBA Support

Remote DBA RAC

Remote DBA Reasons

Remote Oracle Tuning

Remote DBA Links

Oracle DBA Support

Oracle DBA Forum

Oracle Disaster

Oracle Training

Oracle Tuning

Oracle Training

 Remote DBA SQL Server

Remote MSSQL Consulting

Oracle DBA Hosting

Oracle License Negotiation

 

 


 

 

 

        
 

     Oracle Features of SQL*Net version 1

When a connection is made to SQL*Net, it passes the request to its underlying layer, the TNS, where the request is transmitted to the appropriate server.  At the server, SQL*Net receives the request from TNS and passes the SQL to the database. TNS is the “transparent network substrate”; a single, common interface to all protocols.  TNS has the ability to connect to databases in physically separate networks.  At the lowest level,  TNS communicates to other databases with message level send-receive commands.

 

Client side - The User Programmatic Interface (UPI) is the central client component.  The UPI converts SQL to associated parse, execute and fetch statements.  The UPI parses the SQL, opens the SQL cursor, binds the client application, describes the contents of returned data fields, executes the SQL, fetches the rows and closes the cursor.  Oracle attempts to minimize messages to the server by combining UPI calls whenever possible.

 

Server side - The Oracle Programmatic Interface (OPI) is the central server component.  The OPI is the obverse of the UPI;  it responds to all possible messages from the UPI and returning requests.

 

For server to server communication there is no UPI, instead there is a Network Programmatic Interface (NPI) at the initiating server.  SQL*Net supports network transparency such that the network structure may be changed without effecting the SQL*Net application. Location transparency is achieved with database-links and synonyms.

 

SQL*Net v 1 was the first attempt by Oracle at database connectivity.  In SQL*Net v 1, database connections requires that the request supply all of the connection information.  This includes the protocol, the host name (or IP address) and the database name.  To connect to the “tom” database on the dilbert server using TCP/IP, you would set a UNIX environment variable called TWO_TASK.  When the request is made SQL*Net v 1 will interrogate the contents of TWO_TASK to get the database information.

 

For example, let’s make a connection from the fred server to the dilbert server, and connect to the “tom” databases using TCP/IP:

 

Fred> export TWO_TASK=t:dilbert:tom

fred> sqlplus /

 

SQL*Plus: Release 3.3.4.0.0 - Production on Thu Mar 18 08:25:30 1999

 

Copyright (c) Oracle Corporation 1979, 1996.  All rights reserved.

 

 

Connected to:

Oracle7 Server Release 7.3.4.0.0 - Production

With the distributed option

PL/SQL Release 2.3.4.0.0 - Production

 

SQL> select * from v$database;

 

NAME      CREATED              LOG_MODE     CHECKPOINT_CHANGE# ARCHIVE_CHANGE#

--------- -------------------- ------------ ------------------ ---------------

TOM       06/13/98 19:00:26    NOARCHIVELOG         2.8713E+12      2.8713E+12

 

 

One of the biggest shortcoming of SQL*Net v 1 was the requirement to “know” all of the connection information, instead of having a look-up file to get this information.  In SQL*Net version 2 we see this information.

Remote DBA Service
 

Oracle Tuning Book

 

Advance SQL Tuning Book 

BC Oracle support

Oracle books by Rampant

Oracle monitoring software

 

 

 

 

 

 

 

 

 

BC Remote Oracle Support

Remote DBA

Remote DBA Services

Copyright © 1996 -  2013 by Burleson. All rights reserved.

Oracle® is the registered trademark of Oracle Corporation.