TAILIEUCHUNG - Managing Tablespaces and Data Files

Tablespaces and Data Files Databases, tablespaces, and data files are closely related, but they have important differences: An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database’s data. Each tablespace in an Oracle database consists of one or more files called data files, which are physical structures that conform with the operating system in which Oracle is running. A database’s data is collectively stored in the data files that constitute each tablespace of the database. For example, the simplest Oracle database would have one tablespace and one data file. Another database can have. | Managing Tablespaces and Data Files Objectives After completing this lesson, you should be able to do the following: Define the purpose of tablespaces and data files Create tablespaces Manage tablespaces Create and manage tablespaces using Oracle Managed Files (OMF) Obtain tablespace information Tablespaces and Data Files Oracle stores data logically in tablespaces and physically in data files. Tablespaces: Can belong to only one database at a time Consist of one or more data files Are further divided into logical units of storage Data files: Can belong to only one tablespace and one database Are a repository for schema object data Database Tablespace Data files Tablespaces and Data Files Databases, tablespaces, and data files are closely related, but they have important differences: An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database’s data. Each tablespace in an Oracle database consists of one or more files called data files, which are physical structures that conform with the operating system in which Oracle is running. A database’s data is collectively stored in the data files that constitute each tablespace of the database. For example, the simplest Oracle database would have one tablespace and one data file. Another database can have three tablespaces, each consisting of two data files (for a total of six data files). Types of Tablespaces SYSTEM tablespace Created with the database Contains the data dictionary Contains the SYSTEM undo segment Non-SYSTEM tablespace Separate segments Eases space administration Controls amount of space allocated to a user Types of Tablespaces The DBA creates tablespaces for increased control and ease of maintenance. The Oracle server perceives two types of tablespaces: SYSTEM and all others. SYSTEM tablespace Created with the database Required in all databases Contains the data dictionary, including stored program units Contains the SYSTEM undo .

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