How to query Oracle character sets

1. What is the Oracle character set?

The Oracle character set is a collection of symbols for the interpretation of byte data. It can be divided into different sizes and have an inclusive relationship. Oracle supports the national language architecture, allowing you to store, process, and retrieve data in a localized language. It makes database tools, error messages, sorting order, date, time, currency, numbers, and calendar automatically adapt to localization languages and platforms.

The most important parameter that affects the character set of Oracle databases is the nls_lang parameter. The format is as follows:

Nls_lang = language_territory.charset

It has three components (language, region, and Character Set), each of which controls the NLS subset features. Where:

Language specifies the language of the server message, territory specifies the date and number format of the server, and charset specifies the character set. For example: American _ America. zhs16gbk

From the composition of nls_lang, we can see that the real impact on the database character set is actually the third part. Therefore, if the character set between the two databases is the same as that in the third part, data can be imported and exported to each other. The preceding information is only prompted in Chinese or English.

Ii. How to query Oracle character sets

Many people have encountered data import failures due to different character sets. This involves three character sets: one is the character set on the El server side, the other is the character set on the Oracle client side, and the other is the DMP file character set. During data import, the three character sets must be consistent before the data can be correctly imported.

1. query character sets of ORACLE Server

There are many ways to find out the character set of the Oracle server. The intuitive query method is as follows: SQL> select userenv ('language') from dual;

The results are as follows: American _ America. zhs16gbk