* Analisis con otro tamaño de bloque

[z.facultad/75.06/emufs.git] / doc / analisis.lyx

diff --git a/doc/analisis.lyx b/doc/analisis.lyx
index f9d974c2658c0fc3df918de0fb71d0cba8f49d47..9811aa27eccd843c7c110d680abf4b136c5360fd 100644 (file)
--- a/doc/analisis.lyx
+++ b/doc/analisis.lyx
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@@ -1381,7 +1025,9 @@ Espacio Libre
 
 \layout Standard
 
-Media de Espacio Libre
+
+\size small 
+Máximo de Espacio Libre
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+
+\size small 
+Mínimo de Espacio Libre
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+</lyxtabular>
+
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+
+
+\layout Standard
+
+Evidentemente para el caso de artículos, una muy mala eleccion seria utilizar
+ el archivo de tipo3, puesto que al usar registros constantes es posible
+ que se desperdicie mucho espacio si ocurren muchas eliminaciones (como
+ se observa en la tabla).
+ Entre los tipos 1 y 2 no existe mucha diferencia en los números, por lo
+ que la decisión podría ser tomada en base a los tiempos de acceso.
+ Tomando este criterio el T2 sería la mejor forma de almacenar los datos
+ si lo más frecuente son lecturas, ya que al leer se puede obtener el offset
+ desde el principio del registro, mientras que en el tipo1 se debe hacer
+ una búsqueda secuencial sobre el bloque, y de ser éste último muy grande
+ el tiempo de acceso puede ser elevado.
+ 
+\layout Standard
+
+Para operaciones que requiera muchas bajas de elementos el tipo 2 no sería
+ la mejor opción, puesto que la liberación es compleja, ya que cuando se
+ da de baja un registro se debe verificar si dicho espacio se solapa con
+ algún espacio libre actual, de manera de mantener espacios libres como
+ lo hacen los sistemas de archivo ext2, manteniendo la lista de los offsets
+ y tamaño de espacios libres, a fin de buscar el que mejor ajuste en caso
+ de una alta.
+\layout Standard
+
+Para el caso de artículos, donde puede haber un continuo cambio en la oferta
+ de nuestro negocio, nos inclinaremos por el tipo de archivo 1, con un tamaño
+ de bloque reducido.
+ Solo recordaremos compactar el archivo periodicamente a fin de minimizar
+ el espacio desperdiciado.
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+
+Facturas
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+
+
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+
+\begin_inset  Tabular
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@@ -1744,24 +2287,8 @@ M
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-\noun off 
-\color none
-196
-\family default 
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-\shape default 
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- bytes
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 </row>
@@ -1781,6 +2308,9 @@ Primero descartaremos al tipo 3 como un buen modo de almacenar las facturas,
  espacio desperdiciado en los datos, y tomando valores pequeños de registro
  se limita el sistema en cuanto a cantidad de items a colocar en una factura
  se refiere.
+ Se puede notar una leve baja en el espacio libre, y aunmentar el tamaño
+ del bloque quizas más hga que este valor baje, pero se aumentaría el tiempo
+ de acceso a los registros.
 \layout Standard
 
 Nuevamente tenemos una disputa entre el los tipo 1 y 2.