{"id":14420,"date":"2025-03-17T18:45:03","date_gmt":"2025-03-17T13:15:03","guid":{"rendered":"https:\/\/www.skynats.com\/?p=14420"},"modified":"2025-03-26T12:48:56","modified_gmt":"2025-03-26T07:18:56","slug":"how-to-resolve-mysql-error-unknown-collation-utf8mb4-0900-ai-ci","status":"publish","type":"post","link":"https:\/\/www.skynats.com\/blog\/how-to-resolve-mysql-error-unknown-collation-utf8mb4-0900-ai-ci\/","title":{"rendered":"How to Resolve MySQL Error:\u00a0 Unknown Collation \u2018utf8mb4_0900_ai_ci\u2019"},"content":{"rendered":"\n<p>If you\u2019ve encountered the error message &#8220;MySQL Error Unknown collation: \u2018utf8mb4_0900_ai_ci\u2019&#8221; while importing a database backup from a server to localhost, don\u2019t worry! This error typically arises due to version mismatches in MySQL, which prevent the database engine from interpreting specific collation or character encoding types. Let\u2019s explore what this error means and how you can fix the error.<\/p>\n\n\n\n<p>Collation refers to the set of rules that dictate how character strings are compared, sorted, and stored in a database. In <a href=\"https:\/\/www.mysql.com\/\">MySQL<\/a>, collations play a crucial role in determining how data types like <code>CHAR<\/code>, <code>VARCHAR<\/code>, and <code>TEXT<\/code> handle sorting, case sensitivity, and how characters from different languages are treated. Each collation is associated with a specific character set, which defines the encoding of characters in the database. The error &#8220;Unknown collation \u2018utf8mb4_0900_ai_ci\u2019&#8221; often occurs due to version compatibility issues, where older MySQL versions do not recognize or support the newer collations introduced in later versions, such as. <code>utf8mb4_0900_ai_ci<\/code> This collation is commonly used in MySQL 8.0 and later, so if you&#8217;re working with a previous version of MySQL, it may not be supported, leading to this error. Resolving this issue typically requires updating the MySQL version or modifying the collation to one supported by the database version in use.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-resolve-mysql-error-nbsp-unknown-collation-utf8mb4-0900-ai-ci\" style=\"font-size:18px\">How to Resolve MySQL Error:&nbsp; Unknown Collation \u2018utf8mb4_0900_ai_ci\u2019<\/h2>\n\n\n\n<p><strong>Fixing the Issue:<\/strong> To resolve this error, edit the database backup file using a text editor. Then replace all occurrences of <strong>utf8mb4_0900_ai_ci<\/strong> with <strong>utf8mb4_general_ci<\/strong>. Similarly, update <strong>CHARSET=utf8mb4<\/strong> to <strong>CHARSET=utf8<\/strong>. For example:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-replace\" style=\"font-size:18px\">Replace:<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-with\" style=\"font-size:18px\">With:<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_general_ci;<\/code><\/pre>\n\n\n\n<p>After editing the backup file as mentioned above, save the backup file and re-import the database. The error should be gone now and the database could be restored successfully without any errors.<\/p>\n\n\n\n<p>Linux users can simplify this process using the <strong>sed<\/strong> command. For that use the following command to replace the lines.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sed -i 's\/utf8mb4_0900_ai_ci\/utf8_general_ci\/g' backup.sql<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>sed -i 's\/CHARSET=utf8mb4\/CHARSET=utf8\/g' backup.sql<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-conclusion\" style=\"font-size:18px\">Conclusion<\/h3>\n\n\n\n<p>After making these changes, the error &#8220;<a href=\"https:\/\/www.skynats.com\/hourly-server-support-services\/\">Unknown collation: \u2018utf8mb4_0900_ai_ci\u2019<\/a>&#8221; should no longer persist, allowing for a successful database restoration. This adjustment resolves the collation issue and ensures compatibility across different MySQL versions, making the database restoration process smoother and error-free. With the correct collation settings in place, you&#8217;ll prevent future conflicts between MySQL versions and maintain optimal database performance.<\/p>\n\n\n\n<p>If you need assistance with how to resolve MySQL Error:\u00a0 Unknown Collation \u2018utf8mb4_0900_ai_ci\u2019 , feel free to\u00a0<a href=\"https:\/\/www.skynats.com\/contact-us\/\">contact us<\/a>.<\/p>\n\n\n\n<p><strong><br><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you\u2019ve encountered the error message &#8220;MySQL Error Unknown collation: \u2018utf8mb4_0900_ai_ci\u2019&#8221; while importing a database backup from a server to localhost, don\u2019t worry! This error typically arises due to version mismatches in MySQL, which prevent the database engine from interpreting specific collation or character encoding types. Let\u2019s explore what this error means and how you [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[985],"class_list":["post-14420","post","type-post","status-publish","format-standard","hentry","category-blog","tag-mysql-unknown-collation-utf8mb4_0900_ai_ci"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>MySQL Unknown Collation \u2018utf8mb4_0900_ai_ci\u2019: Fix Guide<\/title>\n<meta name=\"description\" content=\"Learn how to resolve MySQL Error: Unknown collation: \u2018utf8mb4_0900_ai_ci\u2019 in simple steps. Fix the issue with our detailed guide!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.skynats.com\/blog\/how-to-resolve-mysql-error-unknown-collation-utf8mb4-0900-ai-ci\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Resolve MySQL Error:\u00a0 Unknown Collation \u2018utf8mb4_0900_ai_ci\u2019\" \/>\n<meta property=\"og:description\" content=\"Learn how to resolve MySQL Error: Unknown collation: \u2018utf8mb4_0900_ai_ci\u2019 in simple steps. 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