{"id":12957,"date":"2024-03-15T01:41:34","date_gmt":"2024-03-15T01:41:34","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-implementation-principle-of-mysql-row-level-locks\/"},"modified":"2025-08-05T09:16:36","modified_gmt":"2025-08-05T09:16:36","slug":"what-is-the-implementation-principle-of-mysql-row-level-locks","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-implementation-principle-of-mysql-row-level-locks\/","title":{"rendered":"MySQL Row-Level Locks Explained"},"content":{"rendered":"

The implementation principle of MySQL row level locking is achieved through two ways: lock granularity and lock type.<\/p>\n

    \n
  1. The granularity of locks:
    \nMySQL’s row-level lock is implemented in the InnoDB storage engine, by default using Next-Key Lock, which locks on index records, including both row records and index records, thus avoiding deadlock problems during concurrent operations. Row-level locking in InnoDB is achieved by locking on the index rather than the entire table, allowing only the necessary rows to be locked during concurrent operations, thus improving performance.<\/li>\n
  2. There are two types of locks in MySQL at the row level: shared locks (S lock) and exclusive locks (X lock).<\/li>\n
  3. Shared lock (S-lock): Multiple transactions can hold shared locks simultaneously to ensure the consistency of read operations. Shared locks do not block each other, but are mutually exclusive with exclusive locks.<\/li>\n
  4. Exclusive lock (X lock): An exclusive lock is a lock that allows only one transaction to hold it at a time. If a transaction holds an exclusive lock, other transactions are unable to hold either a shared lock or an exclusive lock simultaneously. Exclusive locks will block each other until the previous transaction releases the lock.<\/li>\n<\/ol>\n

    MySQL’s row-level locking ensures transaction isolation and prevents data inconsistency during concurrent operations. However, it is important to note that excessive row-level locking can lead to performance issues, so when using row-level locking, it is necessary to balance concurrency performance and data consistency.<\/p>\n","protected":false},"excerpt":{"rendered":"

    The implementation principle of MySQL row level locking is achieved through two ways: lock granularity and lock type. The granularity of locks: MySQL’s row-level lock is implemented in the InnoDB storage engine, by default using Next-Key Lock, which locks on index records, including both row records and index records, thus avoiding deadlock problems during concurrent […]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[3179,2171,298,17082,17081],"class_list":["post-12957","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-database-locking","tag-innodb","tag-mysql","tag-next-key-lock","tag-row-level-locks"],"yoast_head":"\nMySQL Row-Level Locks Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Understand how MySQL implements row-level locking in InnoDB using index-based locks and Next-Key Locks for concurrency.\" \/>\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.silicloud.com\/blog\/what-is-the-implementation-principle-of-mysql-row-level-locks\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL Row-Level Locks Explained\" \/>\n<meta property=\"og:description\" content=\"Understand how MySQL implements row-level locking in InnoDB using index-based locks and Next-Key Locks for concurrency.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/what-is-the-implementation-principle-of-mysql-row-level-locks\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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