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Recovering from Control File Corruption Using a Control File Copy → corrupted, that the control file directory is still accessible, and that you have a multiplexed copy … of the control file. With the instance shut down, use an operating system command to overwrite the … bad control file with a good copy: % cp /u03/oracle/prod/control03.ctl /u02/oracle/prod/control02.ctl
What Is a Control File? → Every Oracle Database has a control file, which is a small binary file that records the physical … structure of the database. The control file includes: The database name Names and locations of … number Checkpoint information The control file must be available for writing
Protecting the Control File → you protect each target database control file. You can use the following strategy to protect the … control file. To protect the control file: Create redundant copies of control files through multiplexing … control files without requiring you to restore
About Control File Records → The control file contains two types of records: circular reuse records and noncircular reuse … available record slots are full, the database either expands the control file to make room for a new … make backups of a target database, the database records these backups in the control file.
CONTROL (control file) → Default: none CONTROL specifies the name of the SQL*Loader control file that describes how to load … omitted, SQL*Loader prompts you for it. If the name of your SQL*Loader control file contains … documentation for more information. See Also: Chapter 8 for a detailed description of the SQL*Loader control
Re-Creating a Control File → remain intact, then you can recover the database after creating a new control file. Note that you are … existence and currency of a control file backup, you have the options listed in the following table … Options for Creating the Control File If you... Then... Executed ALTER DATABASE
Maintaining the Control File Repository → , however, then the control file of each target database is the exclusive repository for RMAN metadata … . You should know how information is stored in the control file and ensure that your backup and … recovery strategy protects the control file. See Also: Oracle Database Administrator's
Control File and Server Parameter File Autobackups → Having recent backups of your control file and server parameter file is extremely valuable in many … supports control file and server parameter file autobackups. The autobackup occurs independently of any … backup of the current control file explicitly
Recovering from Permanent Media Failure Using a Control File Copy → inaccessible due to a permanent media failure and that you have a multiplexed copy of the control file … control file to a new, accessible location: % cp /u01/oracle/prod/control01.ctl /u04/oracle/prod … CONTROL_FILES initialization parameter. Remove the bad control file from CONTROL_FILES
Recovering a Control File Using a Current Copy → This section presents ways that you can recover your control file from a current backup or from a multiplexed copy.
When RMAN Performs Control File Autobackups → If CONFIGURE CONTROLFILE AUTOBACKUP is ON, then RMAN automatically backs up the control file and … command. If the database runs in ARCHIVELOG mode, RMAN makes control file autobackups when a … structural change to the database affects the contents of the control file. … the current
Configuring the Snapshot Control File Location → file, it creates a temporary snapshot control file. RMAN needs a snapshot control file when … resynchronizing with the recovery catalog or when making a backup of the current control file. The default … location for the snapshot control file
Performing Recovery with a Backup Control File → This section explains what to do when all current control files are lost and you must restore a control file backup.
About Recovery with a Backup Control File → If all copies of the current control file are lost or damaged, then you must restore and mount a … backup control file. You must then run the RECOVER command, even if no datafiles have been restored … , and open the database with the RESETLOGS option. If some copies of the current control file
How RMAN Performs Control File Autobackups → RMAN backs it up in the same backup set as the control file autobackup. After the autobackup completes … to the alert log located in the Automatic Diagnostic Repository (ADR). Note: Control file … autobackups are never duplexed. The control file autobackup filename has a default format
Preventing the Loss of Control File Records → The best way to prevent the loss of RMAN metadata because of overwritten control file records is to … may lose backup records. Store the control file in a file system rather than raw device so that it … can expand. Monitor the alert log to ensure that Oracle is not overwriting control
Configuring Control File and Server Parameter File Autobackups → As explained in \"Control File and Server Parameter File Autobackups\", you can configure RMAN to … automatically back up the control file and server parameter file. The autobackup occurs whenever a … whenever the database structure metadata in the control file
Backing Up the Control File to a Trace File → The primary method for backing up the control file is to use a SQL statement to generate a binary … sets and copies (if you use RMAN). If COMPATIBLE is 10.2 or higher, binary control file backups … include tempfile entries. To back up the control file after a structural change: Make
Restoring the Server Parameter File from a Control File Autobackup → If you have configured control file autobackups, then the server parameter file is backed up with … the control file whenever an autobackup is taken. To restore the server parameter file from the … control file autobackup, you must first set the DBID
Backing Up the Control File to a Binary File → B ack up the control file of a database after making a structural modification to a database … operating in ARCHIVELOG mode. To back up a database's control file, you must have the ALTER DATABASE … system privilege. Backing Up the Control File to a Binary File