What is an instance of a database?
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 instance name in Oracle database?
The instance name is specified by the INSTANCE_NAME initialization parameter. The instance name defaults to the Oracle system identifier (SID) of the database instance. Some hardware architectures allow multiple computers to share access to data, software, or peripheral devices.
What is an Oracle instance vs Oracle database?
Oracle Database Instances 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.
Which of the following is a part of Oracle architecture?
5. Which of the following components comprise an Oracle architecture? Explanation: Oracle architecture consists of DB process, Table space, Datafiles.
How do I find my Oracle instance name?
From SQL*Plus: 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.
Is instance the same as database?
A database is made up of the physical files that contain the data and metadata that makeup said database. These include the datafiles, controlfiles, and redo log files. Instance: An instance is the memory that is shared and accessed by all the threads and background processes.
What is the architecture of Oracle?
An Oracle database system can easily take advantage of distributed processing by using its client/server architecture. In this architecture, the database system is divided into two parts: a front-end or a client, and a back-end or a server.
What are the 3 levels in 3 schema architecture?
The three levels present in this architecture are Physical level, Conceptual level and External level.
What makes up an instance of an Oracle Database?
An Oracle Database consists of a database and at least one instance. 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.
What kind of architecture does an Oracle Server have?
Oracle Database Server Architecture: Overview 1 Memory Structures. There are three major structures in Oracle Database server architecture: memory structures, process structures, and storage structures. 2 Connecting to the Database Instance. 3 Oracle Database Memory Structures. 4 Process Architecture. 5 Process Structures.
When does Oracle Database automatically recover an instance?
Oracle Database performs instance recovery automatically in the following situations: 1 The database opens for the first time after the failure of a single-instance database or all instances of an Oracle RAC… 2 Some but not all instances of an Oracle RAC database fail. Instance recovery is performed automatically by a surviving… More
What are the structures of an Oracle Database?
There are three major structures in Oracle Database server architecture: memory structures, process structures, and storage structures. A basic Oracle database system consists of an Oracle database and a database instance. The database consists of both physical structures and logical structures.