Why tablespace

A database can have multiple tablespaces where schemas can save data. Note that often, "schemas" and "users" are used as synonyms in Oracle. In SQL Server, you often have multiple databases with multiple schemas within a single database server. I'm a little confused, so if i have to two difference applications, I would create a new instance for each application or new tablespace for each application or new database per application?

In SQL Server, you can just create a new database — Note that the above link to the Oracle Concept guide is broken. Perhaps this is the correct link? SimonKrenger your links are not working and you didn't talk about why multiple table space is needed?

Show 1 more comment. Same here Ocean is database having lots of Data files here data file means water and for better usage and handling you put that into barrel you can relate barrel as Tablespace An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database's data.

Databases, tablespaces, and datafiles are closely related, but they have important differences: Each tablespace in an Oracle database consists of one or more files called datafiles, which are physical structures that conform to the operating system in which Oracle is running.

Rishabh Gupta Rishabh Gupta 1 1 silver badge 11 11 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.

Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Does ES6 make JavaScript frameworks obsolete? Podcast Do polyglots have an edge when it comes to mastering programming Featured on Meta. Now live: A fully responsive profile. Linked Related Hot Network Questions. Any attempt to access data in offline tablespace will result in an error. The read-only tablespaces allow Oracle to avoid performing backup and recovery of large, static parts of a database.

Oracle allows you to remove objects such as tables and indexes from a read-only tablespace. However, it does not allow you to create or alter objects in a read-only tablespace. When you create a new tablespace, it is in the read-write mode. There is usually not much point in making more than one tablespace per logical file system, since you cannot control the location of individual files within a logical file system. However, PostgreSQL does not enforce any such limitation, and indeed it is not directly aware of the file system boundaries on your system.

It just stores files in the directories you tell it to use. Creation of the tablespace itself must be done as a database superuser, but after that you can allow ordinary database users to use it. Tables, indexes, and entire databases can be assigned to particular tablespaces.

To do so, a user with the CREATE privilege on a given tablespace must pass the tablespace name as a parameter to the relevant command. For example, the following creates a table in the tablespace space1 :. This can be a list of tablespace names, rather than only one, so that the load associated with temporary objects can be spread over multiple tablespaces.

A random member of the list is picked each time a temporary object is to be created. The tablespace associated with a database is used to store the system catalogs of that database. If a database is created without specifying a tablespace for it, it uses the same tablespace as the template database it is copied from.

Two tablespaces are automatically created when the database cluster is initialized. Once created, a tablespace can be used from any database, provided the requesting user has sufficient privilege. This means that a tablespace cannot be dropped until all objects in all databases using the tablespace have been removed.