By Abraham Silberschatz, Henry Korth, S. Sudarshan

This ebook is a demand for a direction that i'm taking. The booklet is riddled with error. you could randomly open any web page from the e-book- and you'll find typos and complicated textual content. On a few pages, the powerpoint slides for the e-book don't even fit with the textual content of the e-book. this can be the 6th version of this textbook. I think about it inexcusable that the e-book has countless numbers of typos even after being released for greater than ten years. As one other reviewer mentioned, the extra fabric that's wanted for the publication -like SQL schemas- don't even exist within the book's site- opposite to what the ebook claims. anyone who's contemplating this publication should still think carefully. Please get it from the library - battle through the publication for every week to determine what I suggest- and sell off the publication for any e-book that are supposed to be higher than this.

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En su lugar, ellos forman sus consultas en un lenguaje de consulta de bases de datos. Cada una de estas consultas se envía al procesador de consultas, cuya función es transformar instrucciones LMD a instrucciones que el gestor de almacenamiento entienda. Los analistas que envían las consultas para explorar los datos en la base de datos entran en esta categoría. Las herramientas de procesamiento analítico en línea (OLAP, Online Analytical Processing) simplifican la labor de los analistas permitiéndoles ver resúmenes de datos de formas diferentes.

Es decir, la transferencia de fondos debe ocurrir por completo o no ocurrir en absoluto. Este requisito de todo o nada se denomina atomicidad. Además, es esencial que la ejecución de la transferencia de fondos preserve la consistencia de la base de datos. Es decir, el valor de la suma A + B se debe preservar. Este requisito de corrección se llama consistencia. Finalmente, tras la ejecución correcta de la transferencia de fondos, los nuevos valores de las cuentas A y B deben persistir, a pesar de la posibilidad de fallo del sistema.

Por ejemplo, los aumentos de sueldo se procesaban introduciendo los aumentos en las tarjetas perforadas y leyendo el paquete de cintas perforadas en sincronización con una cinta que contenía los detalles maestros de los salarios. Los registros debían estar igualmente ordenados. Los aumentos de sueldo tenían que añadirse a los sueldos leídos de la cinta maestra, y escribirse en una nueva cinta; esta nueva cinta se convertía en la nueva cinta maestra. Las cintas (y los paquetes de tarjetas perforadas) sólo se podían leer secuencialmente, y los tamaños de datos eran mucho mayores que la 13 FUNDAMENTOS DE BASES DE DATOS de datos de red y jerárquicas existentes.

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