{"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\/cs\/blog\/administrirovanie\/rasshifrovyvaem-key-i-page-waitresource-v-dedlokah-i-blokirovkah","title":{"rendered":"Rozlu\u0161t\u011bn\u00ed Key a Page WaitResource v deadlockech a zam\u010den\u00edch","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Pokud pou\u017e\u00edv\u00e1te zpr\u00e1vu o blokov\u00e1n\u00ed (blocked process report) nebo shroma\u017e\u010fujete grafy blokac\u00ed, kter\u00e9 poskytuje SQL Server, ob\u010das naraz\u00edte na takov\u00e9to v\u011bci: <\/p>\n<blockquote><p>waitresource=\u201cPAGE: 6:3:70133\u201c<\/p>\n<p>waitresource=\u201cKEY: 6:72057594041991168 (ce52f92a058c)\u201c<\/p><\/blockquote>\n<p>\nN\u011bkdy v tom obrovsk\u00e9m XML, kter\u00e9 zkoum\u00e1te, najdete v\u00edce informac\u00ed (grafy deadlock\u016f obsahuj\u00ed seznam zdroj\u016f, kter\u00fd pom\u00e1h\u00e1 zjistit n\u00e1zvy objektu a indexu), ale ne v\u017edy.<\/p>\n<p>Tento text v\u00e1m pom\u016f\u017ee je rozlu\u0161tit.<\/p>\n<p>Ve\u0161ker\u00e9 informace, kter\u00e9 zde jsou, jsou na internetu na r\u016fzn\u00fdch m\u00edstech, jen jsou siln\u011b rozpt\u00fdlen\u00e9! Chci je v\u0161echny shrom\u00e1\u017edit \u2014 od DBCC PAGE po hobt_id a nedokumentovan\u00e9 %%physloc%% a %%lockres%% funkce.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nNejprve si promluv\u00edme o \u010dek\u00e1n\u00ed na PAGE blokace a pot\u00e9 p\u0159ejdeme k KEY blokac\u00edm.<\/p>\n<h3>1) waitresource=\u201cPAGE: 6:3:70133\u201d = Database_Id: FileId: PageNumber<\/h3>\n<p>\nPokud v\u00e1\u0161 dotaz \u010dek\u00e1 na PAGE blokaci, SQL Server v\u00e1m poskytne adresu t\u00e9to str\u00e1nky.<\/p>\n<p>Rozlo\u017een\u00edm \u201ePAGE: 6:3:70133\u201c dost\u00e1v\u00e1me:<\/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) Rozlu\u0161t\u011bn\u00ed database_id<\/h4>\n<p>\nNajdeme n\u00e1zev datab\u00e1ze pomoc\u00ed dotazu:<\/p>\n<pre><code class=\"sql\">SELECT \n    name \nFROM sys.databases \nWHERE database_id=6;\nGO<\/code><\/pre>\n<p>\nToto je ve\u0159ejn\u00e1 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.littlekendra.com\/2016\/09\/13\/deadlock-code-for-the-wideworldimporters-sample-database\/\">datab\u00e1ze WideWorldImporters<\/a><\/noindex> na m\u00e9m SQL Serveru.<\/p>\n<h4>1.2) Hled\u00e1me n\u00e1zev datov\u00e9ho souboru \u2014 pokud v\u00e1s to zaj\u00edm\u00e1<\/h4>\n<p>\nBudeme pou\u017e\u00edvat data_file_id v dal\u0161\u00edm kroku k nalezen\u00ed n\u00e1zvu tabulky. M\u016f\u017eete jednodu\u0161e p\u0159ej\u00edt k dal\u0161\u00edmu kroku, ale pokud v\u00e1s zaj\u00edm\u00e1 n\u00e1zev souboru, m\u016f\u017eete jej naj\u00edt proveden\u00edm dotazu v kontextu nalezen\u00e9 datab\u00e1ze, vlo\u017een\u00edm data_file_id do tohoto dotazu:<\/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 datab\u00e1zi WideWorldImporters je to soubor s n\u00e1zvem WWI_UserData a je obnoven u m\u011b v C:MSSQLDATAWideWorldImporters_UserData.ndf. (Ups, nachytali jste m\u011b, jak ukl\u00e1d\u00e1m soubory na disk se syst\u00e9mem! Ne! To bylo trapn\u00e9).<\/p>\n<h4>1.3) Z\u00edsk\u00e1n\u00ed n\u00e1zvu objektu z DBCC PAGE<\/h4>\n<p>\nNyn\u00ed v\u00edme, \u017ee str\u00e1nka #70133 v datov\u00e9m souboru 3 pat\u0159\u00ed datab\u00e1zi WorldWideImporters. M\u016f\u017eeme se pod\u00edvat na obsah t\u00e9to str\u00e1nky pomoc\u00ed nedokumentovan\u00e9ho DBCC PAGE a trace flagu 3604.<br \/>\nPozn\u00e1mka: D\u00e1v\u00e1m p\u0159ednost pou\u017e\u00edv\u00e1n\u00ed DBCC PAGE na obnoven\u00e9 kopii z z\u00e1lohy n\u011bkde na jin\u00e9m serveru, proto\u017ee je to nedokumentovan\u00e1 z\u00e1le\u017eitost. V n\u011bkter\u00fdch p\u0159\u00edpadech to <noindex><a rel=\"nofollow\" href=\"https:\/\/connect.microsoft.com\/SQLServer\/feedback\/details\/776144\/dbcc-page-incorrect-output-with-filtered-indexes\">m\u016f\u017ee v\u00e9st ke vzniku dumpu<\/a><\/noindex> (<i>pozn. p\u0159ekladatele \u2014 odkaz, bohu\u017eel, vede nikam, ale soud\u011b podle url se jedn\u00e1 o filtered indexy<\/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>\nProch\u00e1zen\u00edm v\u00fdsledk\u016f lze nal\u00e9zt object_id a index_id.<br \/>\n<img decoding=\"async\" alt=\"Rozlu\u0161t\u011bn\u00ed Key a Page WaitResource v deadlockech a zam\u010den\u00edch\" src=\"\/wp-content\/uploads\/2020\/10\/c5a42f36fb7a87cfd2e11adfef3caa17.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nSkoro hotovo! Nyn\u00ed m\u016f\u017eete naj\u00edt n\u00e1zvy tabulky a indexu pomoc\u00ed 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 tady vid\u00edme, \u017ee \u010dek\u00e1n\u00ed na zablokov\u00e1n\u00ed bylo na indexu PK_Sales_OrderLines tabulky Sales.OrderLines.<\/p>\n<p>Pozn\u00e1mka: V SQL Server 2014 a nov\u011bj\u0161\u00edch lze tak\u00e9 naj\u00edt n\u00e1zev objektu pomoc\u00ed nedokumentovan\u00e9ho DMO sys.dm_db_database_page_allocations. Ale budete muset dotazovat ka\u017edou str\u00e1nku v datab\u00e1zi, co\u017e vypad\u00e1 docela \u0161patn\u011b pro velk\u00e9 datab\u00e1ze, tak\u017ee jsem pou\u017eila DBCC PAGE.<\/p>\n<h4>1.4) M\u016f\u017eeme vid\u011bt data na t\u00e9 str\u00e1nce, kter\u00e1 byla zablokov\u00e1na?<\/h4>\n<p>\nNo, mo\u017en\u00e1. Ale\u2026 jste si jisti, \u017ee to opravdu pot\u0159ebujete?<br \/>\nJe to pomal\u00e9, i na mal\u00fdch tabulk\u00e1ch. Ale je to tak trochu zaj\u00edmav\u00e9, tak\u017ee kdy\u017e u\u017e jste do\u0161li a\u017e sem\u2026 poj\u010fme se bavit o %%physloc%%!<\/p>\n<p>%%physloc%% je nedokumentovan\u00fd kousek magie, kter\u00fd vrac\u00ed fyzick\u00fd identifik\u00e1tor pro ka\u017ed\u00fd z\u00e1znam. M\u016f\u017eete pou\u017e\u00edt <noindex><a rel=\"nofollow\" href=\"http:\/\/www.sqlskills.com\/blogs\/paul\/sql-server-2008-new-undocumented-physical-row-locator-function\/\">%%physloc%% spolu se sys.fn_PhysLocFormatter v SQL Server 2008 a nov\u011bj\u0161\u00edch.<\/a><\/noindex>.<\/p>\n<p>Te\u010f, kdy\u017e v\u00edme, \u017ee jsme cht\u011bli uvalit zablokov\u00e1n\u00ed na str\u00e1nku v Sales.OrderLines, m\u016f\u017eeme se pod\u00edvat na v\u0161echna data v t\u00e9to tabulce, kter\u00e1 jsou ulo\u017eena v datov\u00e9m souboru #3 na str\u00e1nce #70133, pomoc\u00ed tohoto 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>Jak jsem \u0159\u00edkala \u2014 je to pomal\u00e9, i na mal\u00fdch tabulk\u00e1ch. P\u0159idala jsem k dotazu NOLOCK, proto\u017ee stejn\u011b nem\u00e1me \u017e\u00e1dn\u00e9 z\u00e1ruky, \u017ee data, na kter\u00e1 se chceme pod\u00edvat, jsou ta stejn\u00e1, kter\u00e1 byla v dob\u011b, kdy byla zablokov\u00e1n\u00ed zji\u0161t\u011bna \u2014 tak\u017ee m\u016f\u017eeme v klidu prov\u00e1d\u011bt nezaru\u010den\u00e9 \u010dten\u00ed.<br \/>\nAle hur\u00e1, dotaz mi vrac\u00ed t\u011bch 25 \u0159\u00e1dk\u016f, o kter\u00e9 na\u0161e dotaz bojovalo.<br \/>\n<img decoding=\"async\" alt=\"Rozlu\u0161t\u011bn\u00ed Key a Page WaitResource v deadlockech a zam\u010den\u00edch\" src=\"\/wp-content\/uploads\/2020\/10\/e7909bb7c496d9509e5f5a1aa30a135a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDost o PAGE blokac\u00edch. Co kdy\u017e \u010dek\u00e1me na KEY blokaci?<\/p>\n<h3>2) waitresource=\u201cKEY: 6:72057594041991168 (ce52f92a058c)\u201d = Database_Id, HOBT_Id (magick\u00fd hash, kter\u00fd lze de\u0161ifrovat pomoc\u00ed %%lockres%%, pokud opravdu chcete)<\/h3>\n<p>Pokud se v\u00e1\u0161 dotaz pokou\u0161\u00ed uvalit zablokov\u00e1n\u00ed na z\u00e1znam v indexu a z\u016fstane s\u00e1m zablokov\u00e1n, dostanete zcela jin\u00fd typ adresy.<br \/>\nRozd\u011blen\u00edm \u201c6:72057594041991168 (ce52f92a058c)\u201d na \u010d\u00e1sti dost\u00e1v\u00e1me:<\/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 p\u0159esn\u011b tak, jak to bylo na v\u00fd\u0161e uveden\u00e9m p\u0159\u00edkladu! Najdeme n\u00e1zev DB pomoc\u00ed dotazu:<\/p>\n<pre><code class=\"sql\">SELECT \n    name \nFROM sys.databases \nWHERE database_id=6;\nGO<\/code><\/pre>\n<p>\nV m\u00e9m p\u0159\u00edpad\u011b je to st\u00e1le to sam\u00e9 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.littlekendra.com\/2016\/09\/13\/deadlock-code-for-the-wideworldimporters-sample-database\/\">datab\u00e1ze WideWorldImporters<\/a><\/noindex>.<\/p>\n<h4>2.2) Dek\u00f3dujeme hobt_id<\/h4>\n<p>\nV kontextu nalezen\u00e9 DB je pot\u0159eba prov\u00e9st dotaz na sys.partitions s p\u00e1r joiny, kter\u00e9 pomohou ur\u010dit n\u00e1zvy tabulky a indexu\u2026<\/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>\n\u0158\u00edk\u00e1 mi, \u017ee dotaz \u010dekal na zablokov\u00e1n\u00ed Application.Countries, pou\u017e\u00edvaj\u00edc\u00ed index PK_Application_Countries.<\/p>\n<h4>2.3) Te\u010f trochu magie %%lockres%% \u2014 pokud chcete zjistit, kter\u00fd z\u00e1znam byl zablokov\u00e1n<\/h4>\n<p>\nPokud opravdu chci zjistit, na kter\u00e9m \u0159\u00e1dku bylo zablokov\u00e1n\u00ed pot\u0159eba, mohu to zjistit pomoc\u00ed dotazu na samotnou tabulku. M\u016f\u017eeme pou\u017e\u00edt nedokumentovanou funkci %%lockres%% k nalezen\u00ed z\u00e1znamu odpov\u00eddaj\u00edc\u00edho kouzeln\u00e9mu hash.<br \/>\nM\u011bjte na pam\u011bti, \u017ee tento dotaz prohled\u00e1 celou tabulku, a na velk\u00fdch tabulk\u00e1ch to m\u016f\u017ee b\u00fdt docela nep\u0159\u00edjemn\u00e9:<\/p>\n<pre><code class=\"sql\">SELECT\n    *\nFROM Application.Countries (NOLOCK)\nWHERE %%lockres%% = '(ce52f92a058c)';\nGO<\/code><\/pre>\n<p>\nP\u0159idala jsem NOLOCK (<noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/Aschenbrenner\/status\/788036874891853824\">na radu Klause Aschenbrennera na Twitteru<\/a><\/noindex>) proto\u017ee zablokov\u00e1n\u00ed m\u016f\u017ee b\u00fdt probl\u00e9m. Chceme se jen pod\u00edvat, co tam te\u010f je, a ne co tam bylo, kdy\u017e transakce za\u010dala \u2014 nemysl\u00edm, \u017ee n\u00e1m z\u00e1le\u017e\u00ed na konzistenci dat.<br \/>\nA je to, z\u00e1znam, o kter\u00fd jsme usilovali!<br \/>\n<img decoding=\"async\" alt=\"Rozlu\u0161t\u011bn\u00ed Key a Page WaitResource v deadlockech a zam\u010den\u00edch\" src=\"\/wp-content\/uploads\/2020\/10\/4107bfa33261ea62d17f27f61b1b4c23.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Pod\u011bkov\u00e1n\u00ed a dal\u0161\u00ed \u010dten\u00ed<\/h3>\n<p>\nNepamatuji si, kdo poprv\u00e9 popsal mnoho z t\u011bchto v\u011bc\u00ed, ale zde jsou dva p\u0159\u00edsp\u011bvky o nejm\u00e9n\u011b zdokumentovan\u00fdch v\u011bcech, kter\u00e9 by v\u00e1s mohly zaj\u00edmat:<\/p>\n<ul>\n<li>P\u0159\u00edsp\u011bvek 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> (jak jsme m\u011bli data v prvn\u00edm p\u0159\u00edkladu)<\/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\u017eit\u00ed %%lockres%%<\/a><\/noindex> (jak jsme na\u0161li data ve druh\u00e9m p\u0159\u00edkladu). Jeden z odpov\u011bd\u00ed odkazuje na p\u0159\u00edsp\u011bvek <noindex><a rel=\"nofollow\" href=\"http:\/\/www.scarydba.com\/2010\/03\/18\/undocumented-virtual-column-lockres\/\">Granta Fritchea o %%lockres%%, napsan\u00fd u\u017e v roce 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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