Utvecklarna av SQLite-projektet har p\u00e5b\u00f6rjat testning av den experimentella backenden HCtree, som st\u00f6der radniv\u00e5l\u00e5sning och erbjuder h\u00f6g grad av parallellisering vid bearbetning av f\u00f6rfr\u00e5gningar. Den nya backenden syftar till att \u00f6ka effektiviteten hos SQLite i klient-server-system d\u00e4r ett stort antal samtidiga skrivf\u00f6rfr\u00e5gningar till databasen m\u00e5ste hanteras. <\/p>\n
b-tree-strukturerna, som ursprungligen anv\u00e4ndes i SQLite f\u00f6r datalagring, \u00e4r inte konstruerade f\u00f6r denna typ av belastning, vilket begr\u00e4nsar SQLite till skrivning i en enda tr\u00e5d. Som ett experiment b\u00f6rjade utvecklarna utveckla en alternativ l\u00f6sning som anv\u00e4nder HC-tree-strukturer f\u00f6r lagring, vilket \u00e4r mer l\u00e4mpligt f\u00f6r parallellisering av skrivoperationer. <\/p>\n
F\u00f6r att organisera samtidig utf\u00f6rande av flera operationer i HCtree-posterna anv\u00e4nds en mekanism f\u00f6r transaktionsuppdelning, som anv\u00e4nder sidniv\u00e5l\u00e5sningar och liknar MVCC (multiversion concurrency control), men anv\u00e4nder transaktionskontroller baserat p\u00e5 nycklar och nyckelomr\u00e5den ist\u00e4llet f\u00f6r sidupps\u00e4ttningar. L\u00e4s- och skrivoperationer utf\u00f6rs kopplat till en databasavbildning, vars \u00e4ndringar blir synliga i den huvudsakliga databasen f\u00f6rst efter att transaktionen har slutf\u00f6rts. <\/p>\n
Kunderna kan anv\u00e4nda tre operationer f\u00f6r att \u00f6ppna transaktioner: <\/p>\n
HCtree st\u00f6der replikeringsstilen \u00abmaster-slave\u00bb, vilket m\u00f6jligg\u00f6r \u00f6verf\u00f6ring av transaktioner till en annan databas och uppr\u00e4tth\u00e5llande av sekund\u00e4ra databaser i ett tillst\u00e5nd som \u00e4r synkroniserat med den prim\u00e4ra databasen. HCtree tar ocks\u00e5 bort begr\u00e4nsningen f\u00f6r databasens storlek \u2014 ist\u00e4llet f\u00f6r 32-bitars identifierare f\u00f6r databasens datasidor anv\u00e4nds 48-bitars, vilket \u00f6kar den maximala databastorleken fr\u00e5n 16 tebibyte till 1 exbibyte (en miljon tebibyte). Prestandan f\u00f6r SQLite med HCtree-backend f\u00f6rv\u00e4ntas vara minst lika bra som den klassiska en-tr\u00e5ds-backenden. SQLite-klienter som st\u00f6der HCtree kommer att kunna n\u00e5 b\u00e5de databaser baserade p\u00e5 HC-tree-strukturen och gamla SQLite-databaser. \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 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K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"