Managing tablespaces

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  • 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.

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  • Managing Privileges A privilege is a right to execute a particular type of SQL statement or to access another user’s object. These include the right to: Connect to a database Create a table Select rows from another user’s table Execute another user’s stored procedure System privileges Each system privilege allows a user to perform a particular database operation or class of database operations; for example, the privilege to create tablespaces is a system privilege.

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  • As a database management system, the management of Oracle file structures is critically important to the successful operation of any system. The Oracle administrator must understand all levels of Oracle file management, including data file management principles, tablespace management principles, and the storage of individual objects within the tablespaces. As Oracle has evolved into one of the world's most complex database management systems, it is imperative that all Oracle professionals understand how their information is stored both at the logical and physical level.

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  • FORCE đăng nhập lực lượng làm lại được tạo ra ngay cả khi Các hoạt động nologging được thực thi. • tablespaces tạm thời và các phân đoạn tạm thời không đăng nhập. • FORCE khai thác gỗ được khuyến khích cho cả thể chất và cơ sở dữ liệu dự phòng hợp lý. • Ban hành các lệnh sau đây trên cơ sở dữ liệu chính:

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  • Chức Năng : Chứa toàn bộ dữ liệu trong database. Lưu Trữ các dữ liệu thuộc cấu trúc logic của database như tables hay indexes Tính Chất Mỗi datafile chỉ có thể được sử dụng trong một database. Một số tính chất cho phép tự động mở rộng kích thước mỗi khi database hết chỗ lưu trữ dữ liệu. Một hay nhiều datafiles tạo nên một đơn vị lưu trữ logic của database gọi là tablespace. Một datafile chỉ thuộc về một tablespace....

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  • The Oracle8 Backup and Recovery Guide contains information that describes the features and functionality of the Oracle8 and the Oracle8 Enterprise Edition products. Oracle8 and Oracle8 Enterprise Edition have the same basic features. However, several advanced features are available only with the Enterprise Edition, and some of these are optional. For example, to perform automated tablespace point-in-time recovery (using Recovery Manager), you must have the Enterprise Edition.

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  • Types of Recovery Manager Backups Recovery Manager provides functionality to back up: The entire database, every datafile in a tablespace, or a single datafile The control file All or selected archived logs Note: The online redo log files are not backed up when using Recovery Manager. Closed Database Backups A closed database backup is defined as a backup of the database while it is closed (offline). This is the same as the consistent database backup. If you are performing a closed backup, the target database must not be open.

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  • After completing this lesson, you should be able to do the following: Describe the concept of automatic undo management Create and maintain the automatic managed undo tablespace Set the retention period Use dynamic performance views to check rollback segment performance Reconfigure and monitor rollback segments Define the number and sizes of rollback segments Allocate rollback segments to transactions

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  • Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted

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  • In either case, the easiest way is to drop the entire tablespace that contains the datafile. The steps that are to be executed from within SQL*Plus are: 1. STARTUP MOUNT 2. For each deleted datafile, issue the command ALTER DATABASE DATAFILE ’full path of filename’ OFFLINE [DROP]; Note: You must use the DROP option if the database is in NOARCHIVELOG mode, because you cannot recover this file if you apply incomplete media recovery on it via the command ALTER DATABASE OPEN RESETLOGS. See the SQL Reference for details. 3. ALTER DATABASE OPEN; 4.

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  • After completing this lesson, you should be able to do the following: List the advantages of distributing different Oracle file types Diagnose tablespace usage problems List reasons for partitioning data in tablespaces Describe how checkpoints work Monitor and tune checkpoints Monitor and tune redo logs

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  • After completing this lesson, you should be able to do the following: List the operations that use temporary space Create and monitor temporary tablespaces Identify actions that use the temporary tablespace Describe the use of disk and memory for sorting Identify the SQL operations that require sorts Differentiate between disk and memory sorts List ways to reduce total sorts and disk sorts Determine the number of memory sorts performed Set parameters to optimize sorts

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