Los desarrolladores del proyecto SQLite han comenzado a probar un backend experimental llamado HCtree, que soporta el bloqueo a nivel de filas (row) y proporciona un alto nivel de paralelismo en el procesamiento de consultas. Este nuevo backend est\u00e1 dise\u00f1ado para mejorar la eficiencia del uso de SQLite en sistemas cliente-servidor que manejan un gran n\u00famero de solicitudes concurrentes a la base de datos para escritura. <\/p>\n
Las estructuras b-tree, que se utilizan en SQLite para almacenar datos, no est\u00e1n dise\u00f1adas para este tipo de carga, lo que limita a SQLite a escribir solo en un solo hilo. Como parte de un experimento, los desarrolladores comenzaron a desarrollar una soluci\u00f3n alternativa que utiliza la estructura HC-tree, m\u00e1s adecuada para paralelizar operaciones de escritura. <\/p>\n
Para organizar la ejecuci\u00f3n concurrente de m\u00faltiples operaciones en HCtree, se aplica un mecanismo de separaci\u00f3n de transacciones, que utiliza bloqueos a nivel de p\u00e1ginas y es similar al MVCC (control de concurrencia multiversi\u00f3n), pero emplea verificaciones de transacciones basadas en claves y rangos de claves en vez de conjuntos de p\u00e1ginas. Las operaciones de lectura y escritura se llevan a cabo en relaci\u00f3n con un snapshot de la base de datos, cuyos cambios son visibles en la base de datos principal solo despu\u00e9s de que se complete la transacci\u00f3n. <\/p>\n
Los clientes pueden utilizar tres operaciones para abrir transacciones: <\/p>\n
HCtree soporta replicaci\u00f3n estilo \u00abmaster-slave\u00bb, permitiendo mover transacciones a otra base de datos y mantener bases de datos secundarias en un estado sincronizado con la base de datos principal. HCtree tambi\u00e9n elimina la limitaci\u00f3n del tama\u00f1o de la base de datos \u2014 en lugar de identificadores de p\u00e1ginas de datos de 32 bits, HCtree utiliza identificadores de 48 bits, lo que incrementa el tama\u00f1o m\u00e1ximo de la base de datos de 16 tebibytes a 1 exbibyte (un mill\u00f3n de tebibytes). Se espera que el rendimiento de SQLite con el backend HCtree no sea inferior al del backend cl\u00e1sico de un solo hilo. Los clientes de SQLite con soporte para HCtree podr\u00e1n acceder tanto a bases de datos basadas en la estructura HC-tree como a las antiguas bases de datos SQLite. \u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 SQLite \u043d\u0430\u0447\u0430\u043b\u0438 \u0442\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0431\u044d\u043a\u0435\u043d\u0434\u0430 HCtree, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0443 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0441\u0442\u0440\u043e\u043a (row) \u0438 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0440\u0430\u0441\u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u043f\u0440\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0435 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041d\u043e\u0432\u044b\u0439 \u0431\u044d\u043a\u0435\u043d\u0434 \u043d\u0430\u0446\u0435\u043b\u0435\u043d \u043d\u0430 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f SQLite \u0432 \u043a\u043b\u0438\u0435\u043d\u0442-\u0441\u0435\u0440\u0432\u0435\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442\u0441\u044f \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0442\u044c \u0431\u043e\u043b\u044c\u0448\u043e\u0435 \u0447\u0438\u0441\u043b\u043e \u043e\u0434\u043d\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u044b\u0445 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u043a \u0411\u0414 \u043d\u0430 \u0437\u0430\u043f\u0438\u0441\u044c. \u0421\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u044b b-tree, \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0435 \u0432 SQLite \u0434\u043b\u044f \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-106417","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Los desarrolladores de SQLite est\u00e1n avanzando en el backend HC-tree con soporte para operaciones de escritura paralelas | ProHoster","description":"Los desarrolladores del proyecto SQLite han comenzado a probar un backend experimental HCtree, que soporta bloqueo a nivel de fila y proporciona un alto nivel de paralelizaci\u00f3n en el procesamiento de 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Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"