How to modify Oracle file path

The Oracle database will be installed to the specified path by default during the installation process. However, during the actual operation and maintenance process, we encountered the common need to migrate the Oracle database to a new hard disk or modify the Oracle data file path. . So, how to modify Oracle's file path?

This article will give you a detailed introduction to modifying Oracle file paths and related precautions from two aspects: Oracle data files and log files.

Modification of Oracle data file path

Preparations needed before modifying the data file path

Before modifying the Oracle data file path, we need to back up the database to cope with Data loss problem caused by file path modification. At the same time, in order to prevent the database from being unable to access the new data file path due to permission issues during operation, we need to add the new path to the system's PATH variable.

Step 1: Close the database

Before modifying the Oracle data file path, you need to close the database first. This operation can be achieved through the following command:

shutdown immediate;

or

shutdown abort;

Among them, shutdown immediate is a fast but safer shutdown method, while shutdown abort is a forced shutdown method. You need to be careful during operation and try to avoid using it.

Step 2: Modify the data file path

Modifying the data file path requires the use of Oracle database management tool - SQL*PLUS. The following are the specific steps:

1. Log in to the Oracle database management tool and use the following command:

sqlplus / as sysdba；

2. Enter the modify data file path window

Use the following command to enter the data file path modification window

ALTER DATABASE RENAME FILE '/home/oracle/oradata/old_data01.dbf'
                              TO '/home/oracle/oradata/new_data01.dbf';

Tips: Among them, /home/oracle/oradata/old_data01.dbf is the old data file path, /home/oracle/oradata/new_data01. dbf is the new data file path, which needs to be modified according to the actual situation.

3. Modify the file integrity check method

After modifying the data file path, Oracle needs to recalculate the checksum of the read and write data under the new address. This operation can be done through ALTER TABLESPACE command implementation:

ALTER TABLESPACE users OFFLINE;
ALTER TABLESPACE users RENAME DATAFILE '/home/oracle/oradata/old_data01.dbf' TO '/home/oracle/oradata/new_data01.dbf';
ALTER TABLESPACE users ONLINE;

The above commands perform operations respectively: ALTER TABLESPACE users OFFLINE deactivate users table space; ALTER TABLESPACE users RENAME DATAFILE '/home/oracle/oradata/old_data01.dbf' TO '/home/ oracle/oradata/new_data01.dbf' modify the table space data file path; ALTER TABLESPACE users ONLINE enables users table space.

Step 3: Open the database

At this point, the data file path is set. In order for the operation to take effect, we need to restart the database, which can be achieved through the following command:

startup;

At this time, the Oracle database has enabled the new data file path.

Modification of Oracle log file path

The method of modifying the Oracle log file path is generally similar to the modification of the data file path, except that the specific content of the modification is slightly different:

Modification Preparations that need to be made before the log file path

Before modifying the log file path, we also need to back up the database in case of emergency.

Step 1: Close the database

Similarly, we need to close the database first. This operation can be achieved through the following command:

shutdown immediate;

or

shutdown abort;

Step 2 : Modify the log file path

In Oracle, log file path generation is achieved by using the REDOLOG command. To modify the log file path, you need to use the following command:

ALTER DATABASE RENAME FILE '/home/oracle/oradata/old_redo01.log' TO '/home/oracle/oradata/new_redo01.log';

Step 3: Open the database

After modifying the log file path, we need to restart the database for the changes to take effect:

startup;

Finally, we need to execute the following command to confirm whether the modification is successful:

SELECT member FROM v$logfile;

Among them, the member column needs to display the new log file path, indicating that the modification is successful.

Notes on Oracle file path modification

• Before modifying the file path, please back up the database to prevent accidents.
• The file path modification operation will involve the underlying architecture of the database and needs to be operated with caution following safety principles.
• When modifying the data or log file path, you need to make corresponding adjustments according to the system and database version.
• When replacing the Oracle storage hard disk, the modified path cannot directly overwrite the original path, and it is necessary to ensure that the original data is intact.

Summary

Through the above introduction, you should already know the specific operations of modifying the Oracle file path. For operation and maintenance personnel, mastering basic Oracle skills is essential. In actual operation and maintenance work, before operating the database, you must carefully consider the risks and necessity of the operation to avoid unnecessary consequences.

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