oracle11g - what is the difference bettween char and nchar datatype when installing oracle 11g with unicode char set option? -

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I install Oracle 11g with the option set Unicode char. And I came to know that I can insert the Unicode character in the chart data column. So my question is: What is the difference between CRAR and NCHAR datatype when installing Oracle 11G with Unicode option? "post-text" itemprop = "text">

There are two main differences.

  1. By default defaults to

    CHAR (30)! = NCHAR (30) but CHAR (30 CR) = NCHAR (30) .

    The default length economics (as specified by the NLS_LENGHTIMITIPCP parameter) is used for CRAC, but not for NCHAR. The default value byte for this parameter is the length of the NCHH is always in the letters. It is important because NCHAR (30) will always have 30 unicode characters - like Chad (30 CRAR) - but in CRAR (30) only 30 bytes will be defaulted Which will be equal to 30 Unicode characters or not.

    1. The AL32UTF8 (database character is Unicode default) and AL16UTF8 (NLS_NCHAR_CHARACTERSET default) are not equivalent. Both variable lengths are Unicode character sets, but the store characters are different, therefore varying the storage requirements between both 1, 2, 3 and sometimes 4 bytes per character and later 2 and sometimes 4 byte per character. ). Your microscope will vary depending on the letters you keep. Additionally, support of NCHH is limited to many client applications and some Oracle components, if you use AL32UTF8 for database letter sets, then Oracle's advice is to simply paste the CRAC and Do not use NCHAR at all.

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