{"id":164600,"date":"2026-03-14T11:12:15","date_gmt":"2026-03-14T09:12:15","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/sqlite-3-51-3-s-ispravleniem-vozmozhnogo-povrezhdeniya-bazy-dannyh-v-rezhime-wal"},"modified":"2026-03-14T11:12:15","modified_gmt":"2026-03-14T09:12:15","slug":"sqlite-3-51-3-s-ispravleniem-vozmozhnogo-povrezhdeniya-bazy-dannyh-v-rezhime-wal","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/sqlite-3-51-3-s-ispravleniem-vozmozhnogo-povrezhdeniya-bazy-dannyh-v-rezhime-wal","title":{"rendered":"SQLite 3.51.3 s opravou mo\u017en\u00e9 chyba po\u0161kozen\u00ed datab\u00e1ze v re\u017eimu WAL.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"SQLite 3.51.3 s opravou mo\u017en\u00e9 chyba po\u0161kozen\u00ed datab\u00e1ze v re\u017eimu WAL.\" src=\"\/wp-content\/uploads\/2026\/03\/3c442654f8b6d86974735255e8214cfe.jpg\" style=\"display:block;margin: 0 auto;\" \/>                              <noindex>      <noindex><\/p>\n<p>Dne 13. b\u0159ezna do\u0161lo k aktualizaci 3.51.3 kompaktn\u00ed integrovan\u00e9 DBMS. <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\">SQLite<\/a>. K\u00f3d projektu je naps\u00e1n v jazyce C a je \u0161\u00ed\u0159en jako ve\u0159ejn\u00e9 vlastnictv\u00ed (public domain).<\/p>\n<p><\/noindex><\/noindex> <noindex><\/p>\n<p>Ve spojen\u00ed s probl\u00e9my zp\u011btn\u00e9 kompatibility, souvisej\u00edc\u00edmi s n\u011bkter\u00fdmi nov\u00fdmi funkcemi, verze <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/releaselog\/3_52_0.html\">3.52.0<\/a> (uvoln\u011bn\u00e1 6. b\u0159ezna) byla sta\u017eena.<\/p>\n<p><\/noindex>  <\/p>\n<p>Seznam zm\u011bn verze 3.51.3:<\/p>\n<ul>\n<li>Dne 3. b\u0159ezna jeden z v\u00fdvoj\u00e1\u0159\u016f SQLite (Dan) objevil a opravil chybu, kter\u00e1 v ojedin\u011bl\u00fdch p\u0159\u00edpadech mohla v\u00e9st k po\u0161kozen\u00ed datab\u00e1ze a nazvan\u00e1 <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/wal.html#walresetbug\">\u201eWAL-reset bug\u201c<\/a>:\n<ul>\n<li>Tato chyba se vyskytuje pouze v datab\u00e1z\u00edch pracuj\u00edc\u00edch v re\u017eimu WAL, pokud je ke stejn\u00e9mu souboru otev\u0159eno v\u00edce ne\u017e jedno p\u0159ipojen\u00ed v r\u016fzn\u00fdch vl\u00e1knech nebo procesech, a pokud se tato dv\u011b p\u0159ipojen\u00ed pokou\u0161ej\u00ed prov\u00e9st z\u00e1pis nebo vytvo\u0159it kontroln\u00ed bod sou\u010dasn\u011b.<\/li>\n<li>Chyba je spojena s konfliktem p\u0159\u00edstupu k dat\u016fm p\u0159i p\u0159\u00edsn\u00fdch \u010dasov\u00fdch limitech. V b\u011b\u017en\u00fdch provozn\u00edch podm\u00ednk\u00e1ch se vyskytuje velmi z\u0159\u00eddka. V\u00fdvoj\u00e1\u0159\u016fm se nepoda\u0159ilo tuto chybu reprodukovat v p\u0159irozen\u00fdch podm\u00ednk\u00e1ch, a museli do SQLite p\u0159idat speci\u00e1ln\u00ed testovac\u00ed logiku, kter\u00e1 z\u00e1m\u011brn\u011b vytv\u00e1\u0159\u00ed podm\u00ednky pro vznik chyby, aby se ujistili, \u017ee probl\u00e9m je vy\u0159e\u0161en.<\/li>\n<li>Chyba vznik\u00e1, kdy\u017e:\n<ol>\n<li>Jedno p\u0159ipojen\u00ed prov\u00e1d\u00ed kontrolu kontroln\u00edho bodu. Tato prvn\u00ed kontrola mus\u00ed b\u00fdt dokon\u010dena. Jin\u00fdmi slovy, b\u011bhem t\u00e9to kontroly je nutn\u00e9 \u00fasp\u011b\u0161n\u011b zkop\u00edrovat cel\u00fd obsah souboru WAL zp\u011bt do datab\u00e1ze a uv\u00e9st soubor WAL do stavu, ve kter\u00e9m m\u016f\u017ee b\u00fdt resetov\u00e1n.<\/li>\n<li>Okam\u017eit\u011b po dokon\u010den\u00ed pr\u00e1ce prvn\u00edho kontroln\u00edho bodu za\u010d\u00edn\u00e1 druh\u00fd.<\/li>\n<li>Zat\u00edmco se iniciuje druh\u00fd kontroln\u00ed bod z kroku 2, jin\u00e9 p\u0159ipojen\u00ed k datab\u00e1zi zapisuje transakci, kter\u00e1 resetuje soubor WAL a zapisuje nov\u00fd obsah na za\u010d\u00e1tek souboru WAL.<\/li>\n<li>V d\u016fsledku konfliktu p\u0159\u00edstupu k dat\u016fm druh\u00fd kontroln\u00ed bod z kroku 2 nevn\u00edm\u00e1, \u017ee soubor WAL byl resetov\u00e1n v d\u016fsledku potvrzen\u00ed transakce v kroku 3. Druh\u00fd kontroln\u00ed bod nastavuje nespr\u00e1vnou hodnotu pro jedno z pol\u00ed v hlavi\u010dce WAL indexu. Toto pole nazna\u010duje, \u017ee \u010d\u00e1st souboru WAL byla ji\u017e potvrzena v kontroln\u00edm bodu, i kdy\u017e ve skute\u010dnosti tomu tak nen\u00ed.<\/li>\n<li>Potvrzen\u00ed dal\u0161\u00edch transakc\u00ed vede k zv\u00fd\u0161en\u00ed po\u010dtu str\u00e1nek v souboru WAL, kter\u00fd p\u0159esahuje po\u010det str\u00e1nek, jen\u017e existoval v okam\u017eiku prvn\u00edho kontroln\u00edho bodu z kroku 1.<\/li>\n<li>Pozd\u011bji, kdy\u017e se objev\u00ed t\u0159et\u00ed kontroln\u00ed bod, p\u0159esko\u010d\u00ed celou nebo \u010d\u00e1st transakce z\u00e1znamu na etap\u011b 3. T\u00edm p\u00e1dem \u010d\u00e1sti transakce z etapy 3 nikdy nebudou vlo\u017eeny do datab\u00e1zov\u00e9ho souboru, co\u017e zp\u016fsob\u00ed jeho po\u0161kozen\u00ed.<\/li>\n<\/ol>\n<\/li>\n<li>Chyba pravd\u011bpodobn\u011b existuje ve v\u0161ech verz\u00edch SQLite, po\u010d\u00ednaje 3.7.0 (21.07.2010) a\u017e po 3.51.2. Byly tak\u00e9 vyd\u00e1ny opravy pro n\u011bkter\u00e9 star\u0161\u00ed verze: <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/info\/863c171b76cd36e0\">3.44.6<\/a> a <a rel=\"nofollow\" href=\"https:\/\/sqlite.org\/src\/info\/c7facf7ac58d2cda\">3.50.7<\/a>.<\/li>\n<\/ul>\n<\/li>\n<li>Dal\u0161\u00ed drobn\u00e1 vylep\u0161en\u00ed.<\/li>\n<\/ul>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/opensource\/18241537\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>13-\u0433\u043e \u043c\u0430\u0440\u0442\u0430 \u0441\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a 3.51.3 \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0439 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0439 \u0421\u0423\u0411\u0414 SQLite. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 C \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435 \u0434\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435 (public domain). \u0412 \u0441\u0432\u044f\u0437\u0438 \u0441 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u043c\u0438 \u043e\u0431\u0440\u0430\u0442\u043d\u043e\u0439 \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c\u043e\u0441\u0442\u0438, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u043c\u0438 \u0441 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u043c\u0438 \u043d\u043e\u0432\u044b\u043c\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c\u0438, \u0432\u0435\u0440\u0441\u0438\u044f 3.52.0 (\u0432\u044b\u0448\u0435\u0434\u0448\u0430\u044f 6-\u0433\u043e \u043c\u0430\u0440\u0442\u0430) \u0431\u044b\u043b\u0430 \u043e\u0442\u043e\u0437\u0432\u0430\u043d\u0430. \u0421\u043f\u0438\u0441\u043e\u043a \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 3.51.3: 3-\u0433\u043e \u043c\u0430\u0440\u0442\u0430 \u043e\u0434\u0438\u043d \u0438\u0437 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 SQLite (Dan) \u043e\u0431\u043d\u0430\u0440\u0443\u0436\u0438\u043b \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0438\u043b [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":164601,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-164600","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 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