The DBA can use additional features of the Export (EXP) and Import (IMP) utilities that a user can use to save and restore database objects.for backing up all user objects in the database or to copy a tablespace to another database. The tablespace copy feature, introduced in Oracle9i, is known as transportable tablespaces. It is [...]
database connectivity
SPFILE in Oracle
An SPFILE (Server Parameter File), new to Oracle9i, is a binary file. The file is not meant to be modified manually and must always reside on the server side. After the file is created it is maintained by the Oracle server. If modified manually, the SPFILE is rendered useless. The SPFILE provides the ability to [...]
PFILE in Oracle
The PFILE (initSID.ora) is a text file that can be maintained using a standard operating system editor. The PFILE is read only during instance startup. If the file is modified, the instance must be shut down and restarted in order to make the new parameter values effective. By default, the PFILE is located in the [...]
Background Processes in Oracle
A process on a server is a section of a computer program in memory that performs a specific task. When the Oracle server starts, multiple processes are started on the server to perform various functions as part of the Oracle instance. While a detailed discussion of all Oracle background processes is beyond the scope of [...]
Initialization Parameter Files in Oracle
In order to start an instance and open the database, you must connect as SYSDBA and enter the STARTUP command. The Oracle server will then read the initialization parameter file and prepare the instance according to the initialization parameters contained within. Note: You must have SYSDBA privilege. Entries are specific to the instance being started [...]
Starting up & Opening of Database in Oracle
Given below are the various commands & steps which are used to startup & open the database for accessing it in Oracle. STARTUP Command Behavior Order of precedence: spfileSID.ora Default SPFILE initSID.ora Default PFILE Specified PFILE can override precedence. STARTUP PFILE = $ORACLE_HOME/dbs/initDBA1.ora PFILE can indicate to use SPFILE. SPFILE = /database/startup/spfileDBA1.ora Starting Up [...]
Process Structures in Oracle
Oracle takes advantage of various types of processes: • User process: Started at the time a database user requests connection to the Oracle server • Server process: Connects to the Oracle instance and is started when a user establishes a session User Process A program that requests interaction with the Oracle server • Must first [...]
Oracle Server Components
An Oracle server consists of both a database and an instance. In Oracle terminology, database refers to only the physical files on disk. These are the files thatstore the data itself, the database state information in the control file, and the changes made to the data in the redo log files. The term instance refers [...]
OCI (Oracle Call Interface)
OCI (Oracle Call Interface) : A set of library routines that allows a C application on virtually any development platform to easily connect to and process SQL statements against an Oracle database. The OCI routines are called as native C library functions; therefore, no preprocessor is necessary when compiling a C application using OCI. OCI [...]
ODBC/JDBC Drivers
ODBC (Open Database Connectivity) : A set of standards that allow applications that are not dependent on any one specific database to process SQL statements against any database that supports SQL Many tools in the Windows (and Unix) environment can take advantage of a common framework known as ODBC, which stands for Open Database Connectivity. [...]
Third-Party Tools in Oracle
Basic network client connectivity is provided during an Oracle client installation. Starting with release 9, Oracle’s network connectivity package is known as Oracle Net Services. Third-party developers can leverage this functionality in their own applications to provide tools customized for a more specific audience and to provide an additional layer of functionality that may [...]
iSQL*Plus
With iSQL*Plus, you connect to the database indirectly via a very “lightweight” middle tier. The iSQL*Plus tool is essentially the web-enabled version of SQL*Plus, with a few restrictions, which we will cover shortly. It is implemented as part of a three-tier Oracle environment, although iSQL*Plus could very well run on the same machine as [...]
Oracle Installation
Oracle Universal Installer Used to install, upgrade, or remove software components, and create a database Based on a Java engine Features include : Automatic dependency resolution Allows for Web-based installations Tracking inventory of component and suite installations De installation of installed components Support for multiple Oracle homes Support for globalization technology Starting the Universal Installer [...]
Securing HTTP End points
A Web service displays data on the Internet to trusted suppliers, customers or business partners. However, you need to ensure that only appropriate people gain access to a critical data. Therefore, it is important to secure the HTTP endpoint. To secure endpoints, you need to perform the following steps : Create appropriate user within the [...]
Service Broker Conversation Process
In the Service Broker Architecture , various services converse with each other by sending and receiving messages.. The following diagram explains the conversation process between two services : The Service Broker Conversation Process The Service Broker applications send and receive messages across services. A message is sent from one service to another for processing. [...]
