{"id":3203,"date":"2022-04-11T09:27:35","date_gmt":"2022-04-11T02:27:35","guid":{"rendered":"https:\/\/www.sqlservertutorial.net\/?page_id=3203"},"modified":"2022-04-11T09:31:36","modified_gmt":"2022-04-11T02:31:36","slug":"sql-server-deadlock","status":"publish","type":"page","link":"https:\/\/www.sqlservertutorial.net\/sql-server-administration\/sql-server-deadlock\/","title":{"rendered":"SQL Server Deadlock"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn about the SQL Server deadlock and how to simulate a deadlock.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-sql-server-deadlock'>Introduction to  the SQL Server deadlock <a href=\"#introduction-to-the-sql-server-deadlock\" class=\"anchor\" id=\"introduction-to-the-sql-server-deadlock\" title=\"Anchor for Introduction to  the SQL Server deadlock\">#<\/a><\/h2>\n\n\n\n<p>A deadlock is a concurrency problem in which two sessions <a href=\"https:\/\/www.sqlservertutorial.net\/sql-server-administration\/sql-server-blocking\/\">block<\/a> the progress of each other. The first session has a lock on a resource that the other session wants to access, and vice versa.<\/p>\n\n\n\n<p>The following picture illustrates a deadlock in SQL Server:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"953\" height=\"420\" src=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Deadlock.png\" alt=\"SQL Server Deadlock\" class=\"wp-image-3205\" srcset=\"https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Deadlock.png 953w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Deadlock-300x132.png 300w, https:\/\/www.sqlservertutorial.net\/wp-content\/uploads\/SQL-Server-Deadlock-768x338.png 768w\" sizes=\"auto, (max-width: 953px) 100vw, 953px\" \/><\/figure>\n\n\n\n<p>In this picture, the <code>invoices<\/code> and <code>invoice_items<\/code> are tables.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, session one accesses the <code>invoices<\/code> table and locks it.<\/li><li>Second, session two locks the <code>invoice_items<\/code> table and locks it.<\/li><li>Third, session one wants to access the <code>invoice_items<\/code> table but needs to wait for session two complete. At the same time, session two wants to access the <code>invoices<\/code> table but needs to wait for session two to complete. <\/li><\/ul>\n\n\n\n<p>As the result, two sessions are waiting for each other until SQL Server proactively terminates one of them. The session that is terminated by SQL Server is called a <strong>deadlock victim<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='sql-server-deadlock-example'>SQL Server deadlock example <a href=\"#sql-server-deadlock-example\" class=\"anchor\" id=\"sql-server-deadlock-example\" title=\"Anchor for SQL Server deadlock example\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take a look at an example of creating a deadlock. In this example, we&#8217;ll first create the <code>invoices<\/code> and <code>invoice_items<\/code> tables:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> invoices (\n  <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">int<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n  customer_id <span class=\"hljs-built_in\">int<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n  total <span class=\"hljs-built_in\">decimal<\/span>(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span> <span class=\"hljs-keyword\">DEFAULT<\/span> <span class=\"hljs-number\">0<\/span> <span class=\"hljs-keyword\">CHECK<\/span> (total &gt;= <span class=\"hljs-number\">0<\/span>)\n);\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> invoice_items (\n  <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">int<\/span>,\n  invoice_id <span class=\"hljs-built_in\">int<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n  item_name <span class=\"hljs-built_in\">varchar<\/span>(<span class=\"hljs-number\">100<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n  amount <span class=\"hljs-built_in\">decimal<\/span>(<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span> <span class=\"hljs-keyword\">CHECK<\/span> (amount &gt;= <span class=\"hljs-number\">0<\/span>),\n  tax <span class=\"hljs-built_in\">decimal<\/span>(<span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">2<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span> <span class=\"hljs-keyword\">CHECK<\/span> (tax &gt;= <span class=\"hljs-number\">0<\/span>),\n  PRIMARY <span class=\"hljs-keyword\">KEY<\/span> (<span class=\"hljs-keyword\">id<\/span>, invoice_id),\n  <span class=\"hljs-keyword\">FOREIGN<\/span> <span class=\"hljs-keyword\">KEY<\/span> (invoice_id) <span class=\"hljs-keyword\">REFERENCES<\/span> invoices (<span class=\"hljs-keyword\">id<\/span>)\n     <span class=\"hljs-keyword\">ON<\/span> <span class=\"hljs-keyword\">UPDATE<\/span> <span class=\"hljs-keyword\">CASCADE<\/span>\n     <span class=\"hljs-keyword\">ON<\/span> <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">CASCADE<\/span>\n);\n\n<span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> invoices (customer_id, total)\n  <span class=\"hljs-keyword\">VALUES<\/span> (<span class=\"hljs-number\">100<\/span>, <span class=\"hljs-number\">0<\/span>);\n\n<span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> invoice_items (<span class=\"hljs-keyword\">id<\/span>, invoice_id, item_name, amount, tax)\n  <span class=\"hljs-keyword\">VALUES<\/span> (<span class=\"hljs-number\">10<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'Keyboard'<\/span>, <span class=\"hljs-number\">70<\/span>, <span class=\"hljs-number\">0.08<\/span>),\n  (<span class=\"hljs-number\">20<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'Mouse'<\/span>, <span class=\"hljs-number\">50<\/span>, <span class=\"hljs-number\">0.08<\/span>);\n\n<span class=\"hljs-keyword\">UPDATE<\/span> invoices\n<span class=\"hljs-keyword\">SET<\/span> total = (<span class=\"hljs-keyword\">SELECT<\/span>\n  <span class=\"hljs-keyword\">SUM<\/span>(amount * (<span class=\"hljs-number\">1<\/span> + tax))\n  <span class=\"hljs-keyword\">FROM<\/span> invoice_items\n  <span class=\"hljs-keyword\">WHERE<\/span> invoice_id = <span class=\"hljs-number\">1<\/span>\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Then, we&#8217;ll create two sessions to connect to the database. Here&#8217;s the sequence of statements that you need to execute from each session.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Session 1<\/th><th>Session 2<\/th><\/tr><\/thead><tbody><tr><td>BEGIN TRAN;<\/td><td><\/td><\/tr><tr><td><\/td><td>BEGIN TRAN;<\/td><\/tr><tr><td>UPDATE invoices<br>SET customer_id = 100<br>WHERE id = 1;<\/td><td><\/td><\/tr><tr><td><\/td><td>UPDATE invoice_items<br>SET amount = 100<br>WHERE id = 10;<\/td><\/tr><tr><td>UPDATE invoice_items<br>SET item_name = &#8216;Cool Keyboard&#8217;<br>WHERE id = 10;<\/td><td><\/td><\/tr><tr><td>Blocked<\/td><td>UPDATE invoices<br>SET total = (SELECT<br>SUM(amount * (1 + tax))<br>FROM invoice_items<br>WHERE invoice_id = 1)<br>WHERE id = 1;<\/td><\/tr><tr><td><\/td><td>Blocked<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Once a deadlock occurs, SQL Server will kill a deadlock victim. In our case, the deadlock victim is the process ID 65.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Transaction (Process ID 65) was deadlocked on <span class=\"hljs-keyword\">lock<\/span> resources <span class=\"hljs-keyword\">with<\/span> another process <span class=\"hljs-keyword\">and<\/span> has been chosen <span class=\"hljs-keyword\">as<\/span> the deadlock victim. Rerun the transaction.<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>SQL Server deadlock is a problem in which two sessions lock on a resource that the other session wants to access and vice versa.<\/li><\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful?<\/div>\n\t\t<div 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