Update nls_lang oracle




















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This post is all about it. Yes, it is a group of characters that is recognised by the Hardware through the OS Interface. Add a comment. Active Oldest Votes. All rights reserved. Database opened. Database dismounted. Total System Global Area 2. Improve this answer.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Typical ISO currency symbols are shown in Table Estonia 1 ,89 EEK Germany 1. The following Table lists the character sets that support the Euro symbol:. The two characters specified must be single-byte and cannot be the same as each other.

This parameter can be specified only in the client environment. Oracle allows you to choose how data is sorted through the use of collation parameters.

Different languages have different sort orders. What's more, different cultures or countries using the same alphabets may sort words differently. The linguistic sort sequence German sorts this sequence as the two characters SS , while the linguistic sort sequence Austrian sorts it as SZ. They are sorted differently throughout the various Germanic languages.

Oracle provides many different types of sort, but achieving a linguistically correct sort frequently harms performance. This is a trade-off the database administrator needs to make on a case-by-case basis. A typical case would be when sorting Spanish. In traditional Spanish, ch and ll are distinct characters, which means that the correct order would be: cerveza , colorado , cheremoya , lago , luna , llama. But a true linguistic sort will cause some performance degradation.

Sorting East Asian languages is difficult and complex. At present, Oracle typically relies on the binary order of the particular encoded character set for sorting East Asian Languages. Conventionally, when character data is sorted, the sort sequence is based on the numeric values of the characters defined by the character encoding scheme.

Such a sort is called a binary sort. Note, however, that in the ASCII standard, all uppercase letters appear before any lowercase letters. When characters used in other languages are present, a binary sort generally does not produce reasonable results. To produce a sort sequence that matches the alphabetic sequence of characters for a particular language, another sort technique must be used that sorts characters independently of their numeric values in the character encoding scheme.

This technique is called a linguistic sort. A linguistic sort operates by replacing characters with other binary values that reflect the character's proper linguistic order so that a sort returns the desired result. The Oracle server provides both sort mechanisms. Linguistic sort sequences are defined as part of language-dependent data. Each linguistic sort sequence has a unique name.

A complete list of linguistic definitions is provided in "Linguistic Definitions". Warning: Linguistic sorting is not supported on Asian multi-byte character sets. If the database character set is multi-byte, you will get binary sorting, which makes the sort sequence dependent on the character set specification. This means that the Japanese Yomi sort is only possible by creating an extra column using the Hiragana or Katakana reading for the kanji and sorting on that column.

You can create a function-based index that uses languages other than English. The index just improves the performance. A simple example is:. For more information, see the description of function-based indexes in Oracle8i Concepts. If you store character data of multiple languages into one database, you may want to create multiple linguistic indexes for one column.

This approach improves the performance of the linguistic sort for a specific column for multiple languages and is a powerful feature for multilingual databases. If you want to use a single linguistic index or multiple linguistic indexes, there are some requirements to be met in order for the linguistic index to be used. This is not a specific requirement for linguistic indexes, but for all function-based indexes.

The below is an example. The fourth requirement is that you need to use the cost-based optimizer. Function-based indexes do not get picked up by the rule-based optimizer. Function-based indexes are used only by the cost-based optimizer. See the example below. You can create a function-based index which improves the performance of case-insensitive searches.

For more information, see the description of function-based indexes in Oracle8i Application Developer's Guide - Fundamentals. Linguistic special cases are character sequences that need to be treated as a single character when sorting. Such special cases are handled automatically when using a linguistic sort. For example, one of the linguistic sort sequences for Spanish specifies that the double characters ch and ll are sorted as single characters appearing between c and d and between l and m respectively.

The linguistic sort sequence German can sort this sequence as the two characters SS , while the linguistic sort sequence Austrian sorts it as SZ. Special cases like these are also handled when converting uppercase characters to lowercase, and vice versa.

For example, to specify the linguistic sort sequence called German, the parameter should be set as follows:. The name given to a linguistic sort sequence has no direct connection to language names. Usually, however, each supported language has an appropriate linguistic sort sequence defined that uses the same name. A complete list of linguistic definitions is provided in Table A-8, "Linguistic Definitions".

This is done by altering the session:. If it is not specified, the client application uses the same character set that it uses for the database character set data. There are four ways to specify NLS parameters: As initialization parameters on the server. You can include parameters in the initialization parameter file to specify a default session NLS environment. These settings have no effect on the client side; they control only the server's behavior.

As a SQL function parameter. All Rights Reserved.



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