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-Evidentemente para el caso de artículos, una muy mala eleccion seria utilizar
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- se observa en la tabla).
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- 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
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- el tiempo de acceso puede ser elevado.
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- algún espacio libre actual, de manera de mantener espacios libres como
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- de una alta.
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-
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- Solo recordaremos compactar el archivo periodicamente a fin de minimizar
- el espacio desperdiciado.
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+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.
+
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+ 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.
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+Para el caso de artículos, donde puede haber un continuo cambio en la oferta
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+ Solo recordaremos compactar el archivo periodicamente a fin de minimizar
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no sea drástica como es el caso de las facturas.
De tomar valores grande de registros, se corre el riesgo de tener mucho
espacio desperdiciado en los datos, y tomando valores pequeños de registro
- se limita el sistema en cuanto a cantidad de items a meter en una factura
+ 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.
\layout Standard
Idealmente, si solo tuvieramos altas el mejor tipo sería el 2 sin dudarlo,
- ya que aprobecha el máximo espacio al no tener pérdidas, debido a que los
+ ya que aprovecha el máximo espacio al no tener pérdidas, debido a que los
registros van uno a continuación del otro.
También tenemos la ventaja de que el acceso es directo.
Para un caso teórico donde las facturas no se dan de baja, esto sería ideal.
pseudo-aleatorias.
Primeramente se puede observar que el tamaño de datos de control es similar
(recordar que se guarda el id del registro para poder realizar tareas de
- recuperacion de datos en caso de que el indice se dañe).
+ recuperación de datos en caso de que el índice se dañe).
El máximo espacio libre no nos da mucha información, ya que en el caso
del tipo 1 podríamos tener n bloques consecutivos libres y tener posiciones
para almacenar registros grandes en ambos casos (recordar que tipo1 tiene
- recuperacion de espacio libre para n bloques consecutivos, no siempre se
+ recuperación de espacio libre para n bloques consecutivos, no siempre se
agrega al final).
De todos determinar un espacio libre para un archivo de tipo 2 es mucho
más rápido que para tipo1 si el tamaño del registro es grande, ya que el
\layout Standard
En este caso como se trata de facturas, y suponemos que como usuarios de
- sistema queremos cancelar pocas facturas (ya que calcelar una factura significa
- que se cayo una venta) optamos por que el mejor tipo de archivo para almacenar
+ sistema queremos cancelar pocas facturas (ya que cancelar una factura significa
+ que se cayó una venta) optamos por que el mejor tipo de archivo para almacenar
las facturas sera el tipo2.
\the_end
projects / z.facultad / 75.06 / emufs.git / blobdiff