Area of private use in the Oracle database

Hello

one of my customers have very specific needs. In this case, it has its own "characters". It uses Latin characters and certain characters. Their data are mixture of these characters. Their own characters are not in Unicode format and we have specific policies.

These specific characters will be in the private use area, but I don't know if and how the Oracle database support unicode private use area.

Oracle database support unicode private use area?

And what sorting, filtering data? What classification is applied?

Does anyone have experience with characters in the private use area?

Thank you

Fabrice.

Oracle supports Unicode PUA you can store codes of PUA in a database AL32UTF8 and you can treat strings containing characters without special considerations. PUA characters are classified into letters in the Oracle database.

Oracle maps the characters (EUDC) user of various character sets defined multibyte (JA16SJIS, ZHS16GBK, ZHT16MSWIN950, KO16MSWIN949, etc.) to the characters of PUA. These characters are also used by the former Hong Kong HKSCS extension mapping. If supporting user-defined characters in PUA is not a problem for the customer, they can use the standard plane 0 (BMP) PUA [U + E000 to U + F8FF] in their purpose. However, to avoid conflicts with existing maps, they should put their characters in plane 15 PUA [U + F0000-U + FFFFD] or plane 16 PUA [U + 100000-U + 10FFFD]. The downside is that the planes 15 and 16 require four bytes per character in AL32UTF8 compared to three bytes for plane 0.

The classification applied to the characters PUA is the same as that applied to the other characters in a given environment. The order of the characters PUA in the given classification, depends on the type of snack:

  • In BINARY classification, the comparison is obviously based on binary codes. The order depends on encoding (AL16UTF16 vs AL32UTF8), especially for aircraft 15 and 16 PUA plane.
  • In monolingual rankings (which are not well suited for Unicode characters anyway) PUA are generally ignored in the sorting (but does not) than the characters defined explicitly in the given classification. Compared only among themselves, they use the UTF-16 Binary order.
  • In multilingual characters rankings PUA are generally classified after all characters defined explicitly in the rankings, which are characters from scripts (Latin, Cyrillic, Greek, Georgian, Armenian) Europeans and, in some rankings, an East Asian script. Between them, they are classified according to AL16UTF16 (= UTF-16BE) binary collation.
  • In the UCA, the characters multilingual rankings PUA generally are classified into once all characters defined explicitly in the rankings, which are usually all defined Unicode characters. Between them, they are classified according to AL32UTF8 (= UTF - 8) binary collation. Note that the UCA rankings are new in the database Oracle 12 c.

Thank you

Sergiusz

Tags: Database

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