{"id":242442,"date":"2024-08-02T14:21:25","date_gmt":"2024-08-02T21:21:25","guid":{"rendered":"https:\/\/virtual-dba.com\/?p=242442"},"modified":"2024-08-09T08:18:08","modified_gmt":"2024-08-09T15:18:08","slug":"warning-percona-cautions-against-mysql-upgrade-after-8-0-37","status":"publish","type":"post","link":"https:\/\/virtual-dba.com\/blog\/warning-percona-cautions-against-mysql-upgrade-after-8-0-37\/","title":{"rendered":"Warning! Percona Cautions Against MySQL Upgrade After 8.0.37"},"content":{"rendered":"\n<p>Attention MySQL users that are running MySQL 8.0.38, MySQL 8.4.1, or MySQL 9.0.0:<\/p>\n\n\n\n<p>The folks at Percona are sounding the alarms in a <a href=\"https:\/\/www.percona.com\/blog\/do-not-upgrade-to-any-version-of-mysql-after-8-0-37\/?utm_campaign=Blog%202016%3A%20Subscribers%20To%20Blog%20Weekly%20Recap%20Email%20--%202.15.16&amp;utm_medium=email&amp;_hsenc=p2ANqtz-85wSHyJ-45wpvi6VtlbGxyBvmHUu3Ec_mpnP3sIUL2J_iehAGZGqSXBxbu0p4yB11ZaCv5s-vu3jVG4iszzvTXvP5oMA&amp;_hsmi=315519689&amp;utm_content=315519689&amp;utm_source=hs_email\" target=\"_blank\" rel=\"noreferrer noopener\">blog <\/a>published last week. They identified a potential bug, of which mysqld will crash at restart if the database has more than 10,000 tables.&nbsp;<\/p>\n\n\n\n<p>You can test it yourself using a script Percona provided in a reported issue, <a href=\"https:\/\/perconadev.atlassian.net\/browse\/PS-9306\" target=\"_blank\" rel=\"noreferrer noopener\">PS-9306<\/a>.<\/p>\n\n\n\n<p>If you are running a lower version of MySQL 8.0, be sure that your operating system is not automatically updating. If you&#8217;re on a linux system, APT daily script and Snap are some ways automatic updates might be enabled.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Here are steps to take when considering a MySQL upgrade:<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Review Release Notes and Documentation<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MySQL 8.0 Release Notes<\/strong>: Go through the official MySQL 8.0 release notes to understand new features, deprecated functionalities, and potential backward incompatibilities.<\/li>\n\n\n\n<li><strong>MySQL 8.0 Documentation<\/strong>: Familiarize yourself with the MySQL 8.0 documentation, including new configuration options and performance improvements.<\/li>\n<\/ul>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>Backup Your Data<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Full Backup<\/strong>: Ensure you take a complete backup of your current database. Use tools like mysqldump, Percona XtraBackup, or other backup solutions you are comfortable with.<\/li>\n\n\n\n<li><strong>Verify Backups<\/strong>: Test your backups to make sure they can be restored successfully.<\/li>\n<\/ul>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>Test Environment<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Set Up a Test Environment<\/strong>: Create a replica of your production environment to test the upgrade process. This helps in identifying potential issues without affecting the live system.<\/li>\n\n\n\n<li><strong>Run Tests<\/strong>: Perform extensive testing on your applications and queries in this environment to ensure they work correctly with MySQL 8.0.<\/li>\n<\/ul>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li>Check for Deprecated Features<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Identify Deprecated Features<\/strong>: Review the list of features deprecated in MySQL 8.0 and make necessary code changes in your applications.<\/li>\n<\/ul>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li>Update SQL Mode<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>STRICT_TRANS_TABLES<\/strong>: MySQL 8.0 enforces STRICT_TRANS_TABLES SQL mode by default. Ensure your applications handle this correctly.<\/li>\n\n\n\n<li><strong>NO_AUTO_CREATE_USER<\/strong>: This SQL mode has been removed in MySQL 8.0.<\/li>\n<\/ul>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li>Review Character Set and Collation Changes<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Default Character Set<\/strong>: MySQL 8.0 uses utf8mb4 as the default character set. Check if your applications are compatible with this change.<\/li>\n\n\n\n<li><strong>Collation Changes<\/strong>: Review and adjust collations if necessary.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Additional Tips<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Stay Informed<\/strong>: Keep up with MySQL community discussions and updates related to MySQL 8.0.<\/li>\n\n\n\n<li><strong>Seek Help<\/strong>: If you encounter issues, consult the MySQL documentation, forums, or consider professional support from MySQL experts.<\/li>\n<\/ul>\n\n\n\n<p>For more information, please contact us.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Attention MySQL users that are running MySQL 8.0.38, MySQL 8.4.1, or MySQL 9.0.0: The folks at Percona are sounding the alarms in a blog published last week. They identified a potential bug, of which mysqld will crash at restart if the database has more than 10,000 tables.&nbsp; You can test it yourself using a script [&hellip;]<\/p>\n","protected":false},"author":49,"featured_media":242443,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","content-type":"","footnotes":""},"categories":[4166,39],"tags":[40,4188,3752],"class_list":["post-242442","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-mysql","tag-mysql","tag-mysql-8-0","tag-upgrade"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.1.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Percona Cautions Against MySQL Upgrade After 8.0.37<\/title>\n<meta name=\"description\" content=\"Percona warns of a potential bug causing crashes in MySQL 8.0.38, 8.4.1, or 9.0.0 with over 10,000 tables. 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