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This article mainly introduces "how to configure archived log files in Oracle". In daily operation, I believe many people have doubts about how to configure archived log files in Oracle. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts about "how to configure archived log files in Oracle". Next, please follow the editor to study!

There are two modes of operation of oracle database: ARCHIVELOG mode and non-NO ARCHIVELOG mode. In non-archived mode, the previous redo log files are directly overwritten during log switching, and no archived logs are generated. The database runs in archived mode. After log switching, the ARCH process will archive the fully written redo log files. By default, oracle runs in non-archived mode, mainly because archiving mode will bring some performance problems to the system. The ARCH process exists only if the database is running in archived mode. The ARCH process is an optional background process for oracle that archives the logs in order to save all changes to the database. In this way, even if the data file disk is damaged, the database administrator can restore the database to the state it was in at the time of the failure.

Configure database archive log

The way to configure database archiving logs includes the following three steps:

Query the archiving mode of the database to make sure that it is not currently in archiving mode

Connect to the target database with the sys user as SYSDBA, and then execute the ARCHIVELOG LIST command to view the database archive mode:

Close the database and start the database to the mount state

Use the ALTER DATABASE ARCHIVELOG command to set the database to archive mode and verify that the archive mode of the database has changed

Get archive log information

The data dictionary view helps users get database configuration information. Users obtain archive log information by using V$ARCHIVE_DEST and V$ARCHIVE_LOG views

V$ARCHIVE_DEST: displays the current storage location and status of all archive logs

V$ARCHIVE_LOG: displays historical archive log information

How to view all valid archive log file storage directories

Get the information about the archived log files, and the archiving process copies the online redo log files to an archived log file after each log switch, resulting in a continuous string of log files that can be used to restore a backup. The name and location of these log files are controlled by several initialization parameters.

At this point, the study on "how to configure archived log files in Oracle" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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