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		<title>¿Cómo diferenciar VARCHAR2 en Oracle Data Base?</title>
		<link>https://linuxbasico.com/diferenciar-varchar2-en-oracle-data-base</link>
					<comments>https://linuxbasico.com/diferenciar-varchar2-en-oracle-data-base#respond</comments>
		
		<dc:creator><![CDATA[Aitzol Tola]]></dc:creator>
		<pubDate>Thu, 13 Aug 2020 21:17:52 +0000</pubDate>
				<category><![CDATA[Bases de datos]]></category>
		<category><![CDATA[Tutoriales]]></category>
		<category><![CDATA[base de datos]]></category>
		<category><![CDATA[byte]]></category>
		<category><![CDATA[char]]></category>
		<category><![CDATA[data base]]></category>
		<category><![CDATA[Oracle]]></category>
		<category><![CDATA[varchar2]]></category>
		<guid isPermaLink="false">https://linuxbasico.com/?p=910</guid>

					<description><![CDATA[<p>Es importante, diferenciar el uso de VARCHAR2 (n byte o char). A continuación, conoceremos qué es VARCHAR2 en Oracle Data Base. Para diferenciar las dos cadenas de caracteres, hay que tener en cuenta que VARCHAR2 (byte) delimita en bytes mientras...</p>
<p>La entrada <a href="https://linuxbasico.com/diferenciar-varchar2-en-oracle-data-base">¿Cómo diferenciar VARCHAR2 en Oracle Data Base?</a> se publicó primero en <a href="https://linuxbasico.com">Linux Básico</a>.</p>
]]></description>
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<h5 class="wp-block-heading">Es importante, diferenciar el uso de <strong>VARCHAR2 </strong>(n byte o char). A continuación, conoceremos qué es VARCHAR2 en Oracle Data Base.</h5>



<p>Para diferenciar las dos cadenas de caracteres, hay que tener en cuenta que <strong>VARCHAR2 (byte) delimita en bytes</strong> mientras que <strong>VARCHAR2 (char) delimita el número de caracteres</strong>. </p>



<p>Aun así, se podría gestionar mejor los bytes de almacenamiento, usando NVARCHAR2, ya que su función es la misma que la de VARCHAR2 (10 CHAR).</p>



<p>Según el juego de caracteres usada en la base de datos, por ejemplo, <a href="https://docs.oracle.com/cd/E11882_01/server.112/e10729/ch6unicode.htm#NLSPG006" target="_blank" rel="noreferrer noopener">AL32UTF8</a> los caracteres <strong>pueden ser de hasta 4 byte</strong>. Cosa que no pasa en WE8MSWIN1252 ya que en este caso todos los caracteres eran de un solo byte y no requiere almacenamiento multibyte.</p>



<p>Según el caso, cambiarían los bytes almacenados, dándonos <strong>un menor o mayor espacio</strong>, si por ejemplo, son caracteres de la zona de Asia. </p>



<p>En ese caso, mejor usar NVARCHAR2 antes que VARCHAR2 (n CHAR) y así será menor los bytes almacenados en la base de datos.</p>



<p><strong>Usar NVARCHAR2 es mejor que VARCHAR2</strong> (n CHAR) solo en el caso de que se vaya a usar la base de datos con caracteres asiáticos.</p>



<p>Es conveniente usar siempre el tipo de datos <strong>VARCHAR2 para almacenar cadenas de caracteres de longitud variable</strong>. Los cuales son todos aquellos caracteres que pueden ser de más de un byte de longitud.</p>



<p>Si la base de datos se ejecuta en un conjunto de caracteres de un solo byte (por ejemplo, US7ASCII, WE8MSWIN1252 o WE8ISO8859P1). </p>



<p><strong>No importa si se usa VARCHAR2 (BYTE) o VARCHAR2 (CHAR)</strong> porque los caracteres en estos son de un solo byte y la cantidad delimitada en ambos casos sería la misma.</p>



<p>Solo hace una diferencia cuando la base de datos se ejecuta en un conjunto de caracteres de varios bytes (por ejemplo, AL32UTF8 o AL16UTF16).</p>



<h3 class="wp-block-heading">Simplemente puede verse en este ejemplo:</h3>



<div class="wp-block-group"><div class="wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow">
<pre class="wp-block-code"><code>CREATE TABLE my_table (
    VARCHAR2_byte VARCHAR2(1 BYTE), 
    VARCHAR2_char VARCHAR2(1 CHAR)
);

INSERT INTO my_table (VARCHAR2_char) VALUES ('€');
1 row created.

INSERT INTO my_table (VARCHAR2_char) VALUES ('ü');
1 row created.

INSERT INTO my_table (VARCHAR2_byte) VALUES ('€');
INSERT INTO my_table (VARCHAR2_byte) VALUES ('€')
Error at line 10
ORA-12899: value too large for column "MY_TABLE"."VARCHAR2_BYTE" (actual: 3, maximum: 1)

INSERT INTO my_table (VARCHAR2_byte) VALUES ('ü')
Error at line 11
ORA-12899: value too large for column "MY_TABLE"."VARCHAR2_BYTE" (actual: 2, maximum: 1)
</code></pre>
</div></div>



<p>Podemos apreciar que al insertar un carácter multibyte en un solo byte, n<strong>os dará el error de falta de espacio</strong> usando VARCHAR2 (1 BYTE) pero al insertarlo en VARCHAR2 (1 CHAR), <strong>nos dejara guardar el carácter que queramos </strong>sin importar su peso en byte, ya que en el caso de Unicode podrían ser de hasta 4 bytes.</p>



<p>Sin embargo, VARCHAR2 (4000 CHAR) <strong>no significa que tenga la garantía de almacenar hasta 4000 caracteres</strong>. El límite sigue siendo de 4000 bytes, por lo que en el peor de los casos puede almacenar solo hasta 1000 caracteres en dicho campo.</p>



<p>Además, después de la versión 12c, el máximo para varchar2 ahora es 32767 byte solo si el parámetro de inicialización &#8220;MAX_STRING_SIZE&#8221; está en &#8220;EXTENDED&#8221;, en el caso de no ser así, el máximo por defecto seguiría siendo de 4000 byte. </p>



<p>Si se necesita más que eso, sería conveniente usar una cadena de caracteres CLOB que nos daría un límite de bytes mayor.</p>



<p>En el PL/SQL, los bytes almacenados de las ambas formas, ya sea VARCHAR2 (n byte) o VARCHAR2 (n char) se guardaran usando los mismos bytes por carácter.</p>



<p>Acorde a esta información si sabemos exactamente la cantidad de bytes que serán almacenados, <strong>la mejor forma de guardarlos sería usando VARCHAR2</strong> (n byte).</p>



<p>Sabiendo que siempre serán los mismos caracteres ya que al usar otros podría verse afectado el máximo de bytes de no saber cuántos byte van a ocupar esos caracteres y queremos delimitarlos en cantidad de caracteres, será más apropiado usar VARCHAR2 (n char).</p>



<p>Si te ha sido útil puedes leer mas entradas sobre bases de datos en <a href="https://linuxbasico.com/temas/bases/" target="_blank" rel="noreferrer noopener">nuestra web</a>.</p>
<div class="saboxplugin-wrap" itemtype="http://schema.org/Person" itemscope itemprop="author"><div class="saboxplugin-tab"><div class="saboxplugin-gravatar"><img alt='Aitzol Tola' src='https://secure.gravatar.com/avatar/b3edc2ff46161b84a215098becde31639b1f3c4c7da0116abb6145f5521b038f?s=100&#038;d=mm&#038;r=g' srcset='https://secure.gravatar.com/avatar/b3edc2ff46161b84a215098becde31639b1f3c4c7da0116abb6145f5521b038f?s=200&#038;d=mm&#038;r=g 2x' class='avatar avatar-100 photo' height='100' width='100' itemprop="image"/></div><div class="saboxplugin-authorname"><a href="https://linuxbasico.com/author/aitzoltola" class="vcard author" rel="author"><span class="fn">Aitzol Tola</span></a></div><div class="saboxplugin-desc"><div itemprop="description"><p>Soy un Técnico Informático con una gran pasión hacia las nuevas tecnologías.</p>
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