{"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\/en\/blog\/administrirovanie\/rasshifrovyvaem-key-i-page-waitresource-v-dedlokah-i-blokirovkah","title":{"rendered":"Decoding Key and Page WaitResource in deadlocks and locks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>If you are using the blocked process report or collecting deadlock graphs provided by SQL Server periodically, you will encounter things like this: <\/p>\n<blockquote><p>waitresource=\"PAGE: 6:3:70133\"<\/p>\n<p>waitresource=\"KEY: 6:72057594041991168 (ce52f92a058c)\"<\/p><\/blockquote>\n<p>\nSometimes, in that huge XML you are examining, there will be more information (deadlock graphs contain a list of resources that help identify the object and index names), but not always.<\/p>\n<p>This text will help you decode them.<\/p>\n<p>All the information here is available online in various places; it's just widely scattered! I want to bring everything together\u2014from DBCC PAGE to hobt_id and undocumented %%physloc%% and %%lockres%% functions.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nFirst, let's talk about waits on PAGE locks and then move on to KEY locks.<\/p>\n<h3>1) waitresource=\"PAGE: 6:3:70133\" = Database_Id: FileId: PageNumber<\/h3>\n<p>\nIf your query is waiting on a PAGE lock, SQL Server will provide you with the address of this page.<\/p>\n<p>Breaking down \"PAGE: 6:3:70133\" we get:<\/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) Decoding database_id<\/h4>\n<p>\nLet's find the database name using this query:<\/p>\n<pre><code class=\"sql\">SELECT \n    name \nFROM sys.databases \nWHERE database_id=6;\nGO<\/code><\/pre>\n<p>\nThis is the public <noindex><a rel=\"nofollow\" href=\"https:\/\/www.littlekendra.com\/2016\/09\/13\/deadlock-code-for-the-wideworldimporters-sample-database\/\">WideWorldImporters<\/a><\/noindex> DB on my SQL Server.<\/p>\n<h4>1.2) Looking for the data file name\u2014if you're interested<\/h4>\n<p>\nWe are going to use data_file_id in the next step to find the table name. You could proceed to the next step, but if you are curious about the file name, you can find it by executing a query in the context of the found DB, substituting data_file_id into this query:<\/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>\nIn the WideWorldImporters DB, this file is named WWI_UserData, and it has been restored to C:MSSQLDATAWideWorldImporters_UserData.ndf. (Oops, you caught me putting files on the system disk! No! That\u2019s awkward).<\/p>\n<h4>1.3) Getting the object name from DBCC PAGE<\/h4>\n<p>\nNow we know that page #70133 in data file 3 belongs to the WideWorldImporters DB. We can inspect the contents of this page using the undocumented DBCC PAGE and trace flag 3604.<br \/>\nNote: I prefer to use DBCC PAGE on a backup-restored copy somewhere on another server because this is undocumented. In some cases, it <noindex><a rel=\"nofollow\" href=\"https:\/\/connect.microsoft.com\/SQLServer\/feedback\/details\/776144\/dbcc-page-incorrect-output-with-filtered-indexes\">may lead to a dump<\/a><\/noindex> (<i>translator's note\u2014unfortunately, the link goes nowhere, but judging by the URL, it's about filtered indexes.<\/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>\nBy promoting to the results, you can find the object_id and index_id.<br \/>\n<img decoding=\"async\" alt=\"Decoding Key and Page WaitResource in deadlocks and locks\" src=\"\/wp-content\/uploads\/2020\/10\/c5a42f36fb7a87cfd2e11adfef3caa17.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nAlmost done! Now, you can find the table and index names using the query:<\/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>\nAnd here we can see that the wait on the block was on the index PK_Sales_OrderLines of the Sales.OrderLines table.<\/p>\n<p>Note: In SQL Server 2014 and later, the object name can also be found using the undocumented DMO sys.dm_db_database_page_allocations. However, you'll need to query each page in the DB, which doesn't look very cool for large databases, so I used DBCC PAGE.<\/p>\n<h4>1.4) Can we see the data on the page that was blocked?<\/h4>\n<p>\nWell, yes. But... are you sure you really need this?<br \/>\nIt's slow even on small tables. But it seems kind of cool, so since you've read this far... let's talk about %%physloc%%!<\/p>\n<p>%%physloc%% is an undocumented piece of magic that returns a physical identifier for each record. You can use <noindex><a rel=\"nofollow\" href=\"http:\/\/www.sqlskills.com\/blogs\/paul\/sql-server-2008-new-undocumented-physical-row-locator-function\/\">%%physloc%% together with sys.fn_PhysLocFormatter in SQL Server 2008 and later.<\/a><\/noindex>.<\/p>\n<p>Now that we know we wanted to lock the page in Sales.OrderLines, we can look at all the data in this table stored in data file #3 on page #70133 using the following query:<\/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>As I said \u2014 it's slow even on tiny tables. I added NOLOCK to the query because we still have no guarantees that the data we want to look at is the same as it was at the moment when the block was detected \u2014 so we can comfortably do dirty reads.<br \/>\nBut hooray, the query returns the very 25 rows for which our request was fighting.<br \/>\n<img decoding=\"async\" alt=\"Decoding Key and Page WaitResource in deadlocks and locks\" src=\"\/wp-content\/uploads\/2020\/10\/e7909bb7c496d9509e5f5a1aa30a135a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nEnough about PAGE locks. What if we're waiting for a KEY lock?<\/p>\n<h3>2) waitresource=\"KEY: 6:72057594041991168 (ce52f92a058c)\" = Database_Id, HOBT_Id (the magical hash that can be decoded using %%lockres%%, if you really want to)<\/h3>\n<p>If your query is trying to lock a record in the index and ends up being blocked itself, you get a completely different type of address.<br \/>\nBreaking down \"6:72057594041991168 (ce52f92a058c)\" we get:<\/p>\n<ul>\n<li>database_id = 6<\/li>\n<li>hobt_id = 72057594041991168<\/li>\n<li>magical hash = (ce52f92a058c)<\/li>\n<\/ul>\n<h4>2.1) Decoding database_id<\/h4>\n<p>\nThis works exactly the same as in the example above! We find the database name using the query:<\/p>\n<pre><code class=\"sql\">SELECT \n    name \nFROM sys.databases \nWHERE database_id=6;\nGO<\/code><\/pre>\n<p>\nIn my case, it's the same one <noindex><a rel=\"nofollow\" href=\"https:\/\/www.littlekendra.com\/2016\/09\/13\/deadlock-code-for-the-wideworldimporters-sample-database\/\">WideWorldImporters<\/a><\/noindex>.<\/p>\n<h4>2.2) Decoding hobt_id<\/h4>\n<p>\nIn the context of the found database, we need to query sys.partitions with a pair of joins to help identify the table and index names...<\/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>\nIt tells me that the query was waiting on the lock Application.Countries, using the index PK_Application_Countries.<\/p>\n<h4>2.3) Now for a bit of magic %%lockres%% \u2014 if you want to find out which record was blocked<\/h4>\n<p>\nIf I really want to know which row needed the lock, I can find it with a query on the table itself. We can use the undocumented function %%lockres%% to find the record that matches the magic hash.<br \/>\nKeep in mind that this query will scan the entire table, and on large tables, this can be quite inconvenient:<\/p>\n<pre><code class=\"sql\">SELECT\n    *\nFROM Application.Countries (NOLOCK)\nWHERE %%lockres%% = '(ce52f92a058c)';\nGO<\/code><\/pre>\n<p>\nI added NOLOCK (<noindex><a rel=\"nofollow\" href=\"https:\/\/twitter.com\/Aschenbrenner\/status\/788036874891853824\">on the advice of Klaus Aschenbrenner on Twitter<\/a><\/noindex>) because locks can become an issue. We just want to see what's there now, not what was there when the transaction started \u2014 I don't think data consistency is important to us.<br \/>\nVoila, the record we were fighting for!<br \/>\n<img decoding=\"async\" alt=\"Decoding Key and Page WaitResource in deadlocks and locks\" src=\"\/wp-content\/uploads\/2020\/10\/4107bfa33261ea62d17f27f61b1b4c23.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<\/p>\n<h3>Acknowledgments and further reading<\/h3>\n<p>\nI don\u2019t remember who first described many of these things, but here are two posts about some of the least documented tricks that you might find interesting:<\/p>\n<ul>\n<li>Paul Randal's post about <noindex><a rel=\"nofollow\" href=\"http:\/\/www.sqlskills.com\/blogs\/paul\/sql-server-2008-new-undocumented-physical-row-locator-function\/\">%%physloc%% and sys.fn_PhysLocFormatter<\/a><\/noindex> (as we did our data in the first example)<\/li>\n<li>A question on StackOverflow about <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\">using %%lockres%%<\/a><\/noindex> (as we found the data in the second example). One of the answers leads to a post <noindex><a rel=\"nofollow\" href=\"http:\/\/www.scarydba.com\/2010\/03\/18\/undocumented-virtual-column-lockres\/\">by Grant Fritchey on %%lockres%%, written back in 2010<\/a><\/noindex>.<\/li>\n<\/ul>\n<p>Source: <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. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":97703,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-97702","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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, 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