Table of Contents
What is an instance of a database?
A database instance is a set of memory structures that manage database files. A database is a set of physical files on disk created by the CREATE DATABASE statement. The instance manages its associated data and serves the users of the database.
What is an Oracle instance vs Oracle database?
The database is the set of files where application data (the reason for a database) and meta data is stored. An instance is the software (and memory) that Oracle uses to manipulate the data in the database. In order for the instance to be able to manipulate that data, the instance must open the database.
What is Oracle instance name?
Clients can override Oracle’s connection load balancing by specifying a particular instance by which to connect to the database. INSTANCE_NAME specifies the unique name of this instance. In a single-instance database system, the instance name is usually the same as the database name.
What is the difference between a database and an instance?
While the database includes the application data and metadata stored in physical files on a server, an instance is a combination of the software and memory used to access that data. For example, if you sign in to an Oracle database, your login session is an instance.
What is Oracle instance architecture?
An instance, or database instance, is the combination of memory and processes that are a part of a running installation and a database is a set of files that store data. The following picture illustrates the Oracle Database server architecture. And an instance can mount only one database at a single point in time.
How do I find my Oracle instance?
select instance_name from v$instance; select version from v$instance; If the instance name returned references the Oracle release number, this is a Finding.
How do I know if Oracle instance is running?
- Check the oracle process runs: On Un*x: ps -ef|grep pmon. On Windows: tasklist|findstr /i oracle.
- Go to ORACLE_HOME/bin and run: ./ sqlplus /nolog. If after login you get errors, then the database does not run: SQL*Plus: Release 11.2.0.1.0 Production on Sat Feb 31 21:61:61 2014 Copyright (c) 1982, 2014, Oracle.
WHAT IS instance name?
An instance-name is a way to define a specific instance for a particular type of section. For example, the client section is used to define information about a client. When multiple clients are defined, they are distinguished by their instance-name . The same instance-name applies to modules.
What is instance architecture?
An instance, or database instance, is the combination of memory and processes that are a part of a running installation and a database is a set of files that store data. The following picture illustrates the Oracle Database server architecture. Third, multiple database instances can access the same database.
What is instance in Rdbms?
The situation where a data or information is stored in the database at a particular moment of time is called an instance. The database schema that defines variables in tables which belong to a specific database, the records of these variables at a particular moment are called the instance of the database.