August 2024
Intermediate to advanced
616 pages
22h 8m
Spanish
Content preview from Diseño de aplicaciones intensivas en datos
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Capítulo 7. Transacciones
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Algunos autores han afirmado que la confirmación general en dos fases es demasiado cara de soportar, debido a los problemas de rendimiento o disponibilidad que conlleva. Creemos que es mejor que los programadores de aplicaciones se ocupen de los problemas de rendimiento debidos al uso excesivo de transacciones a medida que surgen cuellos de botella, en lugar de codificar siempre en torno a la falta de transacciones.
James Corbett y otros, Spanner: La base de datos distribuida globalmente de Google (2012)
En la dura realidad de los sistemas de datos, muchas cosas pueden ir mal:
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El software o hardware de la base de datos puede fallar en cualquier momento (incluso en medio de una operación de escritura).
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La aplicación puede bloquearse en cualquier momento (incluso a mitad de una serie de operaciones).
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Las interrupciones en la red pueden aislar inesperadamente la aplicación de la base de datos, o un nodo de la base de datos de otro.
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Varios clientes pueden escribir en la base de datos al mismo tiempo, sobrescribiendo los cambios de los demás.
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Un cliente puede leer datos que no tienen sentido porque sólo se han actualizado parcialmente.
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Las condiciones de carrera entre clientes pueden provocar fallos sorprendentes.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.