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Oracle Tutorials: Terminology

May 3, 2023 Leave a Comment

What is Oracle schema?

An Oracle schema is a logical container for database objects, such as tables, views, indexes, and stored procedures. It is owned by a specific database user and can be used to organize and manage database objects within that user’s space.

A schema is a collection of database objects that belong to a specific user, and it allows users to separate and organize their data in a logical way. For example, a user might create a schema to group related tables, views, and other objects together. Schemas also provide security by limiting access to objects to specific users or roles.

Each schema is identified by a unique name, and it can contain multiple objects, such as tables, views, procedures, and functions. The objects within a schema can be accessed by other users, subject to the access rights granted by the schema owner.

Overall, Oracle schemas provide a way to organize and manage database objects, and they help to ensure the integrity and security of the data stored in the database.

What is Oracle tablespace?

An Oracle tablespace is a logical storage unit that contains physical data files. It is used to group related database objects, such as tables, indexes, and clusters.

In an Oracle database, data is stored in data files, which are organized into tablespaces. Each tablespace is made up of one or more data files, which can be stored on different disks or file systems. This allows database administrators to optimize disk usage, performance, and manageability.

Tablespaces are also used to manage storage and performance. For example, a database administrator can create separate tablespaces for frequently accessed data to improve performance or for infrequently accessed data to conserve storage space. They can also allocate more or less space to a tablespace as needed, and they can backup and restore tablespaces independently of the rest of the database.

In summary, Oracle tablespaces are used to manage database storage and performance by grouping related database objects together and storing them in separate logical storage units. They provide a way to optimize disk usage, improve performance, and manage data backups and restores.

Define terminology of Database in oracle?

Here are some common terminologies used in Oracle database:

  1. Database: A database is a collection of data that is stored in an organized manner, using a set of predefined rules. It includes tables, views, indexes, and other database objects.
  2. Table: A table is a database object that contains data in rows and columns. It is used to organize and store data in a structured format.
  3. Column: A column is a vertical element of a table that represents a specific attribute of the data. It defines the type and size of the data that can be stored in a table.
  4. Row: A row is a horizontal element of a table that represents a single record or data point. It contains data for each column defined in the table.
  5. Schema: A schema is a logical container for database objects. It is owned by a specific database user and can be used to organize and manage database objects within that user’s space.
  6. Index: An index is a database object that is used to speed up data retrieval by providing a quick lookup of the data based on a specific column or set of columns.
  7. View: A view is a virtual table that is created by combining data from one or more tables. It is used to simplify complex queries and provide a customized view of the data.
  8. Constraint: A constraint is a rule that is applied to a table to enforce data integrity. It can be used to enforce uniqueness, referential integrity, and other data validation rules.
  9. Transaction: A transaction is a set of database operations that are executed as a single unit of work. It can be used to ensure data consistency and atomicity.
  10. Backup and Recovery: Backup and recovery are processes used to protect data and recover it in case of a database failure. It involves creating backups of data at regular intervals and restoring the data in case of a failure.

Define user in Oracle

In Oracle, a user is an account that is used to connect to a database and access its objects. Each user is identified by a unique username and password and is associated with a specific set of permissions and privileges.

When a user connects to an Oracle database, they are given access to the objects that they have been granted permission to access. This can include tables, views, procedures, functions, and other database objects.

Users can also be assigned roles, which are collections of privileges and permissions. This allows administrators to grant a set of permissions to a group of users, rather than granting the permissions to each user individually.

Users can also have their own schema, which is a logical container for database objects. This allows users to organize and manage their own data separately from other users.

Overall, users are a fundamental concept in Oracle database security and access control. They provide a way to control access to database objects and ensure that only authorized users can access sensitive data.

SCAN IP


In Oracle Real Application Clusters (RAC), a SCAN IP (Single Client Access Name) is a single name that provides clients with a single, consistent address for connecting to a RAC cluster. The SCAN IP is a virtual IP address that is associated with the RAC cluster as a whole, rather than with individual cluster nodes.

When a client attempts to connect to a RAC cluster using the SCAN IP, the SCAN listener routes the connection request to one of the available cluster nodes. The SCAN listener is responsible for managing connections to the RAC cluster, and it provides load balancing and failover capabilities.

The SCAN IP address is configured during the installation of Oracle Grid Infrastructure (GI) and is stored in the Domain Name System (DNS) or a local host file. The SCAN IP is used by clients to connect to the RAC cluster, and it is also used by other components of Oracle GI, such as the Clusterware and the ASM (Automatic Storage Management) instance, for communication between the cluster nodes.

To determine the SCAN IP address for a RAC cluster, you can use the following command:

$ srvctl config scan

This command displays the SCAN name, SCAN IP address, and SCAN port number for the RAC cluster. You can also use the DNS or a local host file to look up the SCAN IP address.

Rajesh Kumar
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