{"id":97702,"date":"2020-10-20T20:42:28","date_gmt":"2020-10-20T18:42:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/rasshifrovyvaem-key-i-page-waitresource-v-dedlokah-i-blokirovkah"},"modified":"2020-10-20T20:42:28","modified_gmt":"2020-10-20T18:42:28","slug":"rasshifrovyvaem-key-i-page-waitresource-v-dedlokah-i-blokirovkah","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/rasshifrovyvaem-key-i-page-waitresource-v-dedlokah-i-blokirovkah","title":{"rendered":"Dek\u00f3dujeme Key a Page WaitResource v deadlockoch a blok\u00e1dach","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ak pou\u017e\u00edvate spr\u00e1vu o blok\u00e1dach (blocked process report) alebo zbierate grafy deadlockov poskytovan\u00e9 SQL Serverom, ob\u010das sa stretnete s tak\u00fdmito vecami: <\/p>\n<blockquote><p>waitresource=\"PAGE: 6:3:70133\"<\/p>\n<p>waitresource=\"KEY: 6:72057594041991168 (ce52f92a058c)\"<\/p><\/blockquote>\n<p>\nNiekedy v obrovskom XML, ktor\u00e9 sk\u00famate, bude viac inform\u00e1ci\u00ed (grafy deadlockov obsahuj\u00fa zoznam zdrojov, ktor\u00fd pom\u00e1ha zisti\u0165 n\u00e1zvy objektov a indexov), ale nie v\u017edy.<\/p>\n<p>Tento text v\u00e1m pom\u00f4\u017ee ich rozl\u00fa\u0161ti\u0165.<\/p>\n<p>V\u0161etky inform\u00e1cie, ktor\u00e9 tu s\u00fa, s\u00fa na internete na r\u00f4znych miestach, s\u00fa jednoducho ve\u013emi roztr\u00fasen\u00e9! Chcem ich zhroma\u017edi\u0165 dokopy \u2013 od DBCC PAGE po hobt_id a nedokumentovan\u00e9 %%physloc%% a %%lockres%% funkcie.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nNajprv sa porozpr\u00e1vajme o \u010dakaniach na PAGE-zamknutiach a potom prejdeme k KEY-zamknutiam.<\/p>\n<h3>1) waitresource=\"PAGE: 6:3:70133\" = Database_Id: FileId: PageNumber<\/h3>\n<p>\nAk v\u00e1\u0161 dotaz \u010dak\u00e1 na PAGE-zamknut\u00ed, SQL Server v\u00e1m poskytne adresu tejto str\u00e1nky.<\/p>\n<p>Rozlo\u017een\u00edm \u201ePAGE: 6:3:70133\u201c dostaneme:<\/p>\n<ul>\n<li>database_id = 6<\/li>\n<li>data_file_id = 3<\/li>\n<li>page_number = 70133<\/li>\n<\/ul>\n<h4>1.1) Rozl\u00fa\u0161\u0165ujeme database_id<\/h4>\n<p>\nN\u00e1jdeme n\u00e1zov datab\u00e1zy pomocou dotazu:<\/p>\n<pre><code class=\"sql\">SELECT \n    name \nFROM sys.databases \nWHERE database_id=6;\nGO<\/code><\/pre>\n<p>\nToto je verejn\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.littlekendra.com\/2016\/09\/13\/deadlock-code-for-the-wideworldimporters-sample-database\/\">DB WideWorldImporters<\/a><\/noindex> na mojom SQL Serveri.<\/p>\n<h4>1.2) H\u013ead\u00e1me n\u00e1zov s\u00faboru d\u00e1t \u2014 ak v\u00e1s to zauj\u00edma<\/h4>\n<p>\nChyst\u00e1me sa pou\u017ei\u0165 data_file_id v nasleduj\u00facom kroku na n\u00e1jdenie n\u00e1zvu tabu\u013eky. M\u00f4\u017eete jednoducho prejs\u0165 na \u010fal\u0161\u00ed krok, ale ak v\u00e1s zauj\u00edma n\u00e1zov s\u00faboru, m\u00f4\u017eete ho n\u00e1js\u0165 vykonan\u00edm dotazu v kontexte n\u00e1jdenej datab\u00e1zy, pri\u010dom do tohto dotazu vlo\u017e\u00edte data_file_id:<\/p>\n<pre><code class=\"sql\">USE WideWorldImporters;\nGO\nSELECT \n    name, \n    physical_name\nFROM sys.database_files\nWHERE file_id = 3;\nGO<\/code><\/pre>\n<p>\nV DB WideWorldImporters je tento s\u00fabor nazvan\u00fd WWI_UserData a je obnoven\u00fd u m\u0148a na C:MSSQLDATAWideWorldImporters_UserData.ndf. (Ups, prichytili ste ma, ako uklad\u00e1m s\u00fabory na disk so syst\u00e9mom! Nie! To bola nepr\u00edjemn\u00e1 situ\u00e1cia).<\/p>\n<h4>1.3) Z\u00edskavame n\u00e1zov objektu z DBCC PAGE<\/h4>\n<p>\nTeraz vieme, \u017ee str\u00e1nka #70133 v s\u00fabore d\u00e1t 3 patr\u00ed k DB WorldWideImporters. M\u00f4\u017eeme sa pozrie\u0165 na obsah tejto str\u00e1nky pomocou nedokumentovan\u00e9ho DBCC PAGE a trace-flagu 3604.<br \/>\nPozn\u00e1mka: uprednost\u0148ujem pou\u017e\u00edvanie DBCC PAGE na obnoven\u00fdch k\u00f3pi\u00e1ch z backupu niekde na inom serveri, preto\u017ee je to nedokumentovan\u00e1 funkcia. V niektor\u00fdch pr\u00edpadoch to <noindex><a rel=\"nofollow\" href=\"https:\/\/connect.microsoft.com\/SQLServer\/feedback\/details\/776144\/dbcc-page-incorrect-output-with-filtered-indexes\">m\u00f4\u017ee vies\u0165 k vytvoreniu dumpu<\/a><\/noindex> (<i>pozn\u00e1mka prekladate\u013ea \u2014 odkaz, \u017eia\u013e, vedie nikam, ale pod\u013ea url sa hovor\u00ed o filtered-indexoch<\/i>).<\/p>\n<pre><code class=\"sql\">\/* This trace flag makes DBCC PAGE output go to our Messages tab\ninstead of the SQL Server Error Log file *\/\nDBCC TRACEON (3604);\nGO\n\/* DBCC PAGE (DatabaseName, FileNumber, PageNumber, DumpStyle)*\/\nDBCC PAGE ('WideWorldImporters',3,70133,2);\nGO<\/code><\/pre>\n<p>\nPrejden\u00edm k v\u00fdsledkom m\u00f4\u017eete n\u00e1js\u0165 object_id a index_id.<br \/>\n<img decoding=\"async\" alt=\"Dek\u00f3dujeme Key a Page WaitResource v deadlockoch a blok\u00e1dach\" src=\"\/wp-content\/uploads\/2020\/10\/c5a42f36fb7a87cfd2e11adfef3caa17.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nTakmer hotovo! Teraz m\u00f4\u017eeme n\u00e1js\u0165 men\u00e1 tabu\u013eky a indexu pomocou dotazu:<\/p>\n<pre><code class=\"sql\">USE WideWorldImporters;\nGO\nSELECT \n    sc.name as schema_name, \n    so.name as object_name, \n    si.name as index_name\nFROM sys.objects as so \nJOIN sys.indexes as si on \n    so.object_id=si.object_id\nJOIN sys.schemas AS sc on \n    so.schema_id=sc.schema_id\nWHERE \n    so.object_id = 94623380\n    and si.index_id = 1;\nGO<\/code><\/pre>\n<p>\nA teraz vid\u00edme, \u017ee \u010dakacia doba na blokovan\u00ed bola na indexe PK_Sales_OrderLines tabu\u013eky Sales.OrderLines.<\/p>\n<p>Pozn\u00e1mka: v SQL Server 2014 a vy\u0161\u0161ie mo\u017eno n\u00e1zov objektu n\u00e1js\u0165 aj pomocou nedokumentovan\u00e9ho DMO sys.dm_db_database_page_allocations. Ale budete musie\u0165 dotazova\u0165 ka\u017ed\u00fa str\u00e1nku v DB, \u010do nevyzer\u00e1 ve\u013emi dobre pre ve\u013ek\u00e9 datab\u00e1zy, preto som pou\u017eila DBCC PAGE.<\/p>\n<h4>1.4) M\u00f4\u017eeme vidie\u0165 d\u00e1ta na tej str\u00e1nke, ktor\u00e1 bola zablokovan\u00e1?<\/h4>\n<p>\nNo, \u00e1no. Ale\u2026 ste si ist\u00ed, \u017ee to naozaj potrebujete?<br \/>\nJe to pomal\u00e9 aj na mal\u00fdch tabu\u013ek\u00e1ch. Ale je to akosi zauj\u00edmav\u00e9, tak\u017ee ke\u010f ste do\u010d\u00edtali a\u017e sem\u2026 po\u010fme sa porozpr\u00e1va\u0165 o %%physloc%%!<\/p>\n<p>%%physloc%% je nedokumentovan\u00fd k\u00fasok m\u00e1gie, ktor\u00fd vracia fyzick\u00fd identifik\u00e1tor pre ka\u017ed\u00fd z\u00e1znam. M\u00f4\u017eete ho pou\u017ei\u0165 <noindex><a rel=\"nofollow\" href=\"http:\/\/www.sqlskills.com\/blogs\/paul\/sql-server-2008-new-undocumented-physical-row-locator-function\/\">%%physloc%% spolu so sys.fn_PhysLocFormatter v SQL Server 2008 a vy\u0161\u0161ie<\/a><\/noindex>.<\/p>\n<p>Teraz, ke\u010f vieme, \u017ee sme chceli uplatni\u0165 blokovanie na str\u00e1nku v Sales.OrderLines, m\u00f4\u017eeme sa pozrie\u0165 na v\u0161etky d\u00e1ta v tejto tabu\u013eke, ktor\u00e9 s\u00fa ulo\u017een\u00e9 v s\u00fabore \u00fadajov #3 na str\u00e1nke #70133, pomocou tak\u00e9hoto dotazu:<\/p>\n<pre><code class=\"sql\">Use WideWorldImporters;\nGO\nSELECT \n    sys.fn_PhysLocFormatter (%%physloc%%),\n    *\nFROM Sales.OrderLines (NOLOCK)\nWHERE sys.fn_PhysLocFormatter (%%physloc%%) like '(3:70133%'\nGO<\/code><\/pre>\n<p>Ako som povedala \u2014 je to pomal\u00e9 aj na mal\u00fdch tabu\u013ek\u00e1ch. Pridala som k dotazu NOLOCK, preto\u017ee aj tak nem\u00e1me z\u00e1ruky, \u017ee d\u00e1ta, na ktor\u00e9 sa chceme pozrie\u0165, s\u00fa presne tie, ktor\u00e9 boli v momente, ke\u010f bola zisten\u00e1 blok\u00e1da \u2014 tak\u017ee sa m\u00f4\u017eeme pokojne zaobera\u0165 \u0161pinav\u00fdm \u010d\u00edtan\u00edm.<br \/>\nAle hur\u00e1, dotaz mi vracia t\u00fdch 25 riadkov, za ktor\u00e9 n\u00e1\u0161 dotaz bojoval.<br \/>\n<img decoding=\"async\" alt=\"Dek\u00f3dujeme Key a Page WaitResource v deadlockoch a blok\u00e1dach\" src=\"\/wp-content\/uploads\/2020\/10\/e7909bb7c496d9509e5f5a1aa30a135a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDos\u0165 o PAGE blokovaniach. \u010co ak \u010dak\u00e1me na blokovanie KEY?<\/p>\n<h3>2) waitresource=\"KEY: 6:72057594041991168 (ce52f92a058c)\" = Database_Id, HOBT_Id (magick\u00fd hash, ktor\u00fd sa d\u00e1 de\u0161ifrova\u0165 pomocou %%lockres%%, ak to naozaj chcete)<\/h3>\n<p>Ak sa v\u00e1\u0161 dotaz sna\u017e\u00ed uplatni\u0165 blokovanie na z\u00e1znam v indexe a je s\u00e1m zablokovan\u00fd, dostanete \u00faplne in\u00fd typ adresy.<br \/>\nRozdelen\u00edm \u201e6:72057594041991168 (ce52f92a058c)\u201c na \u010dasti dostaneme:<\/p>\n<ul>\n<li>database_id = 6<\/li>\n<li>hobt_id = 72057594041991168<\/li>\n<li>magick\u00fd hash = (ce52f92a058c)<\/li>\n<\/ul>\n<h4>2.1) De\u0161ifrujeme database_id<\/h4>\n<p>\nFunguje to presne tak, ako v predch\u00e1dzaj\u00facom pr\u00edklade! Zist\u00edme n\u00e1zov DB pomocou dopytu:<\/p>\n<pre><code class=\"sql\">SELECT \n    name \nFROM sys.databases \nWHERE database_id=6;\nGO<\/code><\/pre>\n<p>\nV mojom pr\u00edpade je to st\u00e1le t\u00e1 ist\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.littlekendra.com\/2016\/09\/13\/deadlock-code-for-the-wideworldimporters-sample-database\/\">DB WideWorldImporters<\/a><\/noindex>.<\/p>\n<h4>2.2) Roz\u0161ifrujeme hobt_id<\/h4>\n<p>\nV kontexte n\u00e1jdenej DB je potrebn\u00e9 vykona\u0165 dopyt k sys.partitions s dvojicou joinov, ktor\u00e9 pom\u00f4\u017eu ur\u010di\u0165 n\u00e1zvy tabu\u013eky a indexu...<\/p>\n<pre><code class=\"sql\">USE WideWorldImporters;\nGO\nSELECT \n    sc.name as schema_name, \n    so.name as object_name, \n    si.name as index_name\nFROM sys.partitions AS p\nJOIN sys.objects as so on \n    p.object_id=so.object_id\nJOIN sys.indexes as si on \n    p.index_id=si.index_id and \n    p.object_id=si.object_id\nJOIN sys.schemas AS sc on \n    so.schema_id=sc.schema_id\nWHERE hobt_id = 72057594041991168;\nGO<\/code><\/pre>\n<p>\nHovor\u00ed mi, \u017ee dopyt \u010dakal na zablokovanie Application.Countries, pou\u017e\u00edvaj\u00fac index PK_Application_Countries.<\/p>\n<h4>2.3) Teraz trochu m\u00e1gie %%lockres%% \u2014 ak chcete zisti\u0165, ktor\u00e1 z\u00e1znam bola zablokovan\u00e1<\/h4>\n<p>\nAk naozaj chcem vedie\u0165, na ktorom riadku bola potrebn\u00e1 zablokovanie, m\u00f4\u017eem to zisti\u0165 pomocou dopytu k samotnej tabu\u013eke. M\u00f4\u017eeme vyu\u017ei\u0165 nedokumentovan\u00fa funkciu %%lockres%% na n\u00e1jdenie z\u00e1znamu zodpovedaj\u00faceho magick\u00e9mu hash.<br \/>\nMajte na pam\u00e4ti, \u017ee tento dopyt preh\u013ead\u00e1 cel\u00fa tabu\u013eku a na ve\u013ek\u00fdch tabu\u013ek\u00e1ch to nemus\u00ed by\u0165 v\u00f4bec z\u00e1bava:<\/p>\n<pre><code class=\"sql\">SELECT\n    *\nFROM Application.Countries (NOLOCK)\nWHERE %%lockres%% = '(ce52f92a058c)';\nGO<\/code><\/pre>\n<p>\nPridala som NOLOCK (<noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/Aschenbrenner\/status\/788036874891853824\">pod\u013ea rady Klausa Aschenbrennera na Twitteri<\/a><\/noindex>) preto\u017ee zablokovania m\u00f4\u017eu by\u0165 probl\u00e9mom. Chceme sa len pozrie\u0165, \u010do tam teraz je, a nie \u010do tam bolo, ke\u010f sa transakcia za\u010dala \u2014 nemysl\u00edm si, \u017ee konzistencia \u00fadajov je pre n\u00e1s d\u00f4le\u017eit\u00e1.<br \/>\nVoila, z\u00e1znam, o ktor\u00fd sme bojovali!<br \/>\n<img decoding=\"async\" alt=\"Dek\u00f3dujeme Key a Page WaitResource v deadlockoch a blok\u00e1dach\" src=\"\/wp-content\/uploads\/2020\/10\/4107bfa33261ea62d17f27f61b1b4c23.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Po\u010fakovania a \u010fal\u0161ie \u010d\u00edtanie<\/h3>\n<p>\nNepam\u00e4t\u00e1m si, kto prv\u00fd pop\u00edsal mnoh\u00e9 z t\u00fdchto vec\u00ed, ale tu s\u00fa dva pr\u00edspevky o najmenej dokumentovan\u00fdch veciach, ktor\u00e9 by sa v\u00e1m mohli p\u00e1\u010di\u0165:<\/p>\n<ul>\n<li>Pr\u00edspevok Paula Randal o <noindex><a rel=\"nofollow\" href=\"http:\/\/www.sqlskills.com\/blogs\/paul\/sql-server-2008-new-undocumented-physical-row-locator-function\/\">%%physloc%% a sys.fn_PhysLocFormatter<\/a><\/noindex> (ako sme spracovali na\u0161e \u00fadaje v prvom pr\u00edklade)<\/li>\n<li>Ot\u00e1zka na StackOverflow o <noindex><a rel=\"nofollow\" href=\"https:\/\/dba.stackexchange.com\/questions\/106762\/how-can-i-convert-a-key-in-a-sql-server-deadlock-report-to-the-value\">pou\u017e\u00edvan\u00ed %%lockres%%<\/a><\/noindex> (ako sme na\u0161li \u00fadaje v druhom pr\u00edklade). Jeden z odpoved\u00ed vedie na pr\u00edspevok <noindex><a rel=\"nofollow\" href=\"http:\/\/www.scarydba.com\/2010\/03\/18\/undocumented-virtual-column-lockres\/\">Granta Fritcheyho o %%lockres%%, nap\u00edsan\u00fd u\u017e v 2010<\/a><\/noindex>.<\/li>\n<\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/524098\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0415\u0441\u043b\u0438 \u0432\u044b \u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0435\u0441\u044c \u043e\u0442\u0447\u0451\u0442\u043e\u043c \u043e \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0430\u0445 (blocked process report) \u0438\u043b\u0438 \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u0442\u0435 \u0433\u0440\u0430\u0444\u044b \u0434\u0435\u0434\u043b\u043e\u043a\u043e\u0432, \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u043c\u044b\u0435 SQL Server&#8217;\u043e\u043c, \u043f\u0435\u0440\u0438\u043e\u0434\u0438\u0447\u0435\u0441\u043a\u0438, \u0432\u044b \u0431\u0443\u0434\u0435\u0442\u0435 \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u0442\u044c\u0441\u044f \u0441 \u0432\u043e\u0442 \u0442\u0430\u043a\u0438\u043c\u0438 \u0448\u0442\u0443\u043a\u0430\u043c\u0438: waitresource=\u201cPAGE: 6:3:70133\u201c waitresource=\u201cKEY: 6:72057594041991168 (ce52f92a058c)\u201c \u0418\u043d\u043e\u0433\u0434\u0430, \u0432 \u0442\u043e\u043c \u0433\u0438\u0433\u0430\u043d\u0442\u0441\u043a\u043e\u043c XML, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432\u044b \u0438\u0437\u0443\u0447\u0430\u0435\u0442\u0435, \u0431\u0443\u0434\u0435\u0442 \u0431\u043e\u043b\u044c\u0448\u0435 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 (\u0433\u0440\u0430\u0444\u044b \u0434\u0435\u0434\u043b\u043e\u043a\u043e\u0432 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0442 \u0441\u043f\u0438\u0441\u043e\u043a \u0440\u0435\u0441\u0443\u0440\u0441\u043e\u0432, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u043c\u043e\u0433\u0430\u0435\u0442 \u0443\u0437\u043d\u0430\u0442\u044c \u0438\u043c\u0435\u043d\u0430 \u043e\u0431\u044a\u0435\u043a\u0442\u0430 \u0438 \u0438\u043d\u0434\u0435\u043a\u0441\u0430), \u043d\u043e \u043d\u0435 \u0432\u0441\u0435\u0433\u0434\u0430. 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