-#LyX 1.3 created this file. For more info see http://www.lyx.org/
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-Comparación de Tipo de archivos.
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-Método utilizado para la comparación
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-
-Para realizar la comparación entre los distintos tipos de archivo, se generaron
- un XML de artículos con 200 entradas y uno de facturas de 1750 entradas.
- Los valores fueron arbitrarios y un poco más elevados que los requeridos
- en el enunciado para poner a prueba el sistema.
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-
-En la tabla que se dará más adelante, se pueden apreciar los datos característic
-os de cada tipo de archivo.
- El método de prueba fue el siguiente :
-\layout Enumerate
-
-Para cada tipo de archivo se cargaron los archivos XML de prueba.
-\layout Enumerate
-
-Se anotaron las estadísticas que entrega la GUI.
-\layout Enumerate
-
-Se eliminaron alrededor de 50 artículos y 200 facturas.
- El valor no es exacto, puesto que al ser pseudo-aleatoria la cantidad borrada
- puede no ser 50 o 200.
-\layout Enumerate
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-Se anotaron las estadísticas nuevamente.
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-Artículos
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-
-Primero descartaremos al tipo 3 como un buen modo de almacenar las facturas,
- por el sólo hecho de que la cantidad de ítems que puede tener una factura
- está limitada al tamaño de registro utilizado.
- Esto sólo sería razonable en un contexto en donde la variabilidad del registro
- 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 ítems a colocar en una factura
- se refiere.
- Se puede notar una leve baja en el espacio libre, y aumentar el tamaño
- del bloque quizás más haga 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 sólo tuviéramos altas el mejor tipo sería el 2 sin dudarlo,
- 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.
- Hasta aquí solo hemos visto comparaciones con la carga inicial.
-\layout Standard
-
-Analizaremos ahora que pasa luego de borrar varios registros en posiciones
- 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
- 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
- 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
- archivo de tipo1 debe hacer una búsqueda sobre n bloques, mientras que
- el tipo 2 encuentra un gap de tamaño suficiente más rápido.
-\layout Standard
-
-Pero no todo es color de rosa en el mundo de archivos de tipo2.
- Como se dijo anteriormente las bajas de registros requieren de un proceso
- grande al actualizar el índice de espacio libre, para asegurarse de tomar
- espacios libres consecutivos como un solo espacio libre, y en el caso de
- que las bajas y las altas comunes, esto es una pérdida de performance del
- sistema.
-\layout Standard
-
-En este caso como se trata de facturas, y suponemos que como usuarios de
- 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