Oracle database log types and management techniques

Oracle database log types and management skills

In the Oracle database, the log is a very important part. It records the detailed information of the database operation so that it can be used when an error occurs. Fault recovery and data restoration in case of failure or unexpected situation. In this article, we will introduce the main types of logs in Oracle database, as well as some management techniques and code examples.

1. Oracle database log types

1. Archived Redo Log
   Archived log is one of the most important log types in the Oracle database. It records the information in the database. Details of all transactions. When the database enables archive mode, the Redo Log will be automatically transferred to the archive log to avoid data loss and ensure data integrity. Archive logs are very important for database recovery and backup.
2. Redo Log (Redo Log)
   The redo log is another important log type in the Oracle database. It records all change operations that occur in the database, such as INSERT, UPDATE, DELETE, etc. The main function of Redo Log is to provide redo information during database recovery to ensure the consistency and integrity of the database.
3. Control File Log (Control File Log)
   The control file is one of the core files of the Oracle database, which stores the structural information and metadata of the database. The control file log records the change operations in the control file, such as database creation, modification, deletion, etc. Control file logs are critical to database management and recovery.

2. Oracle database log management skills

1. Configuring the archive mode
   In the Oracle database, it is crucial to enable the archive mode, which can Achieved by setting parameters:

   alter database archivelog;

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2. Monitoring archive logs
   Monitor the archiving status of the database by viewing the status and usage of archive logs:

   select dest_name, status, destination from v$archive_dest;

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3. Manual archiving logs
   When you need to manually archive logs, you can use the following command to complete:

   alter system archive log all;

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4. Clean up expired archive logs
   Regularly clean up expired archive logs You can free up storage space and use the following command to complete the cleanup operation:

   delete noprompt archivelog all backed up 1 times to disk;

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5. Monitoring and backing up the control file
   Regular monitoring and backup of the control file is essential, you can use the following command To back up the control file:

   alter database backup controlfile to '<备份路径>';

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The above are some common Oracle database log management techniques, which can help administrators better maintain and manage database logs and ensure the stability and security of the database. sex.

Summary:

There are many types of logs in Oracle database, and each log has its specific role and management method. By properly managing and monitoring database logs, you can ensure the integrity and reliability of the data and ensure the normal operation of the database system. I hope the log types and management techniques introduced in this article will be helpful to you.

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