What should I do if Oracle prompts garbled characters?

Oracle prompts garbled code solution: 1. Modify the database character set, first back up the database, then stop the database, then modify the initialization parameter file and finally start the database; 2. Specify the character set when importing data, you can use "imp" The "CHARSET" parameter of the command specifies the character set of the imported file; 3. Data conversion, use the conversion function provided by Oracle to convert the data.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

When using Oracle database, sometimes you will encounter the problem of garbled characters, which brings a lot of trouble to the storage, query and analysis of data. This article will introduce you to several methods to solve the garbled problem of Oracle database and help you better deal with this problem.

1. Understand the reasons why the Oracle database is garbled

Before solving the problem, we first need to understand the reasons why the Oracle database is garbled. Generally speaking, the main reasons for garbled characters in Oracle database are as follows:

1. Incorrect character set setting: The character set of the database is inconsistent with the character set of the application, resulting in garbled characters when data is stored or displayed.

2. Data import problem: When importing data into the database, if the character set of the data source is inconsistent with the character set of the database, it may also cause garbled characters.

3. Data conversion problem: When performing data conversion, such as converting from one character set to another character set, if errors occur during the conversion process, the data will also be garbled.

2. Methods to solve the problem of garbled characters in Oracle database

In view of the above causes of garbled characters, we can take the following methods to solve the problem of garbled characters in Oracle database:

1. Modify the database character set

First, we need to confirm the character set of the database. You can use the following SQL statement to query:

SELECT value

FROM nls_database_parameters

WHERE parameter = 'NLS_CHARACTERSET';

If the character set is inconsistent with the application character set, you can consider modifying the database character set. Modifying the character set requires caution as it will affect existing data in the database.

The steps are as follows:

1) Back up the database: Before operation, be sure to back up the database to prevent data loss.

2) Stop the database: Log in to the database with administrator rights and enter "shutdown immediate" in the command line to stop the database.

3) Modify the initialization parameter file: Open the database initialization parameter file (usually "init.ora" or "spfileSID.ora"), modify the value of the "NLS_CHARACTERSET" parameter to the desired character set.

4) Start the database: Enter "startup" in the command line to start the database.

2. Specify the character set when importing data

If garbled characters appear when importing data, you can solve the problem by specifying the character set.

When using the Oracle import tool to import data, you can use the "CHARSET" parameter of the "imp" command to specify the character set of the imported file. For example:

imp username/password@sid file=filename.dmp fromuser=fromuser touser=touser CHARSET=character_set

This ensures that the imported data uses the same character set as the exported file.

3. Data conversion

If there is already garbled data, you can use the conversion function provided by Oracle to convert the data.

For example, use the "CONVERT" function to convert data from one character set to another:

SELECT CONVERT(column_name, 'TO_CHARSET') AS converted_column

FROM table_name;

Among them, "column_name" is the column name to be converted, and "TO_CHARSET" is the target character set.

3. Summary

The problem of garbled characters is one of the common problems in Oracle database, but through appropriate methods and techniques, we can solve this problem. This article introduces methods such as modifying the database character set, specifying the character set when importing data, and data conversion to solve the problem of garbled characters in the Oracle database. Hope it helps!

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