Oracle Managed Files

Sau khi hoàn thành bài học này, bạn sẽ có thể làm được những việc sau: Giải thích được cách sử dụng của control file, liệt kê nội dung của control file, tạo và quản lý control file, quản lý tệp tin điều khiển với Oracle Managed Files (OMF), lấy các thông tin về control file.

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Control File The control file is a small binary file necessary for the database to start and operate successfully. Each control file is associated with only one Oracle database. Before a database is opened, the control file is read to determine whether the database is in a valid state to use. A control file is updated continuously by the Oracle server during database use, so it must be available for writing whenever the database is open. The information in the control file can be modified only by the Oracle server; no database administrator or end user can edit the control file....

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Built-In Database Objects In addition to creating the database files, several other structures are created. Data dictionary: Contains descriptions of the objects in the database Dynamic performance tables: Contains information used by the database administrator (DBA) to monitor and tune the database and instance PL/SQL packages: Program units adding functionality to the database. These packages are created when the catproc.sql script is run after the CREATE DATABASE command. PL/SQL packages will not be discussed within the scope of this course.

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After completing this appendix, you should be able to do the following: Log in to SQL*Plus Edit SQL commands Format output using SQL*Plus commands Interact with script files

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Cross Checks of RMAN Backups and Copies Performing a cross check provides you with a way to ensure that data about backup sets and image copies in the RMAN repository is synchronized with corresponding data on disk or in the media management catalog. You can use the LIST command to obtain a report of the backups and copies that you have made and then use the CROSSCHECK command to check that these files still exist. If RMAN cannot find a file, it updates the repository records to EXPIRED. You can determine which files are marked EXPIRED by issuing a LIST EXPIRED command....

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Restoration and Datafile Media Recovery Using RMAN RMAN automates the procedure for restoring files. When you issue the RESTORE command, RMAN uses a server session to restore the correct backups and copies. The RMAN repository is used to select the best available backup set or image copies to use in the restoration. By default, RMAN does not restore a file if the file is already in the correct place and its header contains the correct information. In releases before Oracle9i, the files were always restored.

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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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Với Server Manager Line Mode, ta có thể thực hiện câu lệnh SQL hoặc đoạn lệnh PL/SQL. Các câu lệnh được kết thúc bởi ký tự chấm phẩy ‘ ; ’ Sử dụng ký tự ‘ /’ để kết thúc câu lệnh trong trường hợp đã bấm phím Enter để xuống dòng. Ngoài ra, ta có thể chạy file script chứa các câu lệnh SQL và PL/SQL. Bằng cách sử dụng ký tự ‘ @ ‘ ở trước tên file script.

10p xmen1357 06-01-2011 79 12   Download