{"id":20319,"date":"2022-11-09T09:06:58","date_gmt":"2022-11-09T03:36:58","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-100000-users-concurrent-to-buy-the-same-product-in-asp-net\/"},"modified":"2022-11-09T09:06:58","modified_gmt":"2022-11-09T03:36:58","slug":"solved-100000-users-concurrent-to-buy-the-same-product-in-asp-net","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-100000-users-concurrent-to-buy-the-same-product-in-asp-net\/","title":{"rendered":"[Solved] 100000 users concurrent to buy the same product in ASP.NET"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-24867713\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"24867713\" data-parentid=\"24867488\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>Use transactions. Each transaction is ensuring the consistency of the data (quantity &gt;= 0) at the end of the transaction. <\/p>\n<p>Consistency should be checked exclusively, so no two transactions are allowed to modify quantity at the same time.<\/p>\n<p><strong>OR<\/strong><\/p>\n<p>Do what amazon does &#8211; accept the order (no commitment), no modifying of the quantity. Next step is &#8211; the services try to process the order (transactions run here), and if something goes wrong (exclusive consistency check), send the order denial message to the customer.<\/p>\n<p>This last approach more fits high availability requirements, when the order processing cannot be afforded within each UI request.<\/p>\n<p><strong>About Transactions<\/strong><\/p>\n<p>Database transactions would be one way to implement. e.g. in T-SQL:<\/p>\n<pre><code>begin transaction\n\nset @quantity = select Quantity from Products where ProductName=\"AAA\"\nif @quantity &gt;= @orderedQuantity\nbegin\n    update Products set Quantity = Quantity - @orderedQuantity \n    where ProductName=\"AAA\"\n\n    commit transaction\nend\nelse begin\n    rallback transaction\nend\n<\/code><\/pre>\n<p>In general, your transaction needs to make sure that it acquires exclusive write lock over the record it&#8217;s going to update, and commit data after the consistency check. If the consistency check does not pass, roll back.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved 100000 users concurrent to buy the same product in ASP.NET <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] Use transactions. Each transaction is ensuring the consistency of the data (quantity &gt;= 0) at the end of the transaction. Consistency should be checked exclusively, so no two transactions are allowed to modify quantity at the same time. OR Do what amazon does &#8211; accept the order (no commitment), no modifying of the quantity. &#8230; <a title=\"[Solved] 100000 users concurrent to buy the same product in ASP.NET\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-100000-users-concurrent-to-buy-the-same-product-in-asp-net\/\" aria-label=\"More on [Solved] 100000 users concurrent to buy the same product in ASP.NET\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[751,929,2247],"class_list":["post-20319","post","type-post","status-publish","format-standard","hentry","category-solved","tag-asp-net","tag-concurrency","tag-transactions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] 100000 users concurrent to buy the same product in ASP.NET - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-100000-users-concurrent-to-buy-the-same-product-in-asp-net\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] 100000 users concurrent to buy the same product in ASP.NET - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Use transactions. Each transaction is ensuring the consistency of the data (quantity &gt;= 0) at the end of the transaction. Consistency should be checked exclusively, so no two transactions are allowed to modify quantity at the same time. OR Do what amazon does &#8211; accept the order (no commitment), no modifying of the quantity. ... 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