{"id":114,"date":"2026-03-06T08:55:07","date_gmt":"2026-03-06T08:55:07","guid":{"rendered":"https:\/\/gigz.pk\/sql\/?post_type=lesson&#038;p=114"},"modified":"2026-03-16T18:55:05","modified_gmt":"2026-03-16T18:55:05","slug":"acid-properties","status":"publish","type":"lesson","link":"https:\/\/gigz.pk\/sql\/lesson\/acid-properties\/","title":{"rendered":"ACID Properties"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Databases are essential for storing and managing data reliably. To ensure data integrity and consistency, most database systems follow <strong>ACID properties<\/strong>. ACID is an acronym representing <strong>Atomicity, Consistency, Isolation, and Durability<\/strong>. Understanding these properties is crucial for developers, database administrators, and anyone working with transactional systems.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1. Atomicity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Atomicity ensures that a transaction is treated as a single, indivisible unit.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Either all operations within the transaction are completed successfully.<\/li>\n\n\n\n<li>Or, if any operation fails, the entire transaction is rolled back.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><br>If you transfer money from one account to another, both the debit and credit operations must succeed. If one fails, the system undoes both.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2. Consistency<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Consistency guarantees that a database moves from one valid state to another valid state.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Data must follow all predefined rules, constraints, and triggers.<\/li>\n\n\n\n<li>Any transaction that violates these rules will be rejected.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><br>If an account balance cannot be negative, a transaction that reduces it below zero will be blocked.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3. Isolation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Isolation ensures that transactions occur independently without interference.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Concurrent transactions should not affect each other\u2019s execution.<\/li>\n\n\n\n<li>The database must behave as if transactions are executed one at a time.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><br>If two users try to book the last ticket simultaneously, isolation prevents double booking.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4. Durability<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Durability guarantees that once a transaction is committed, it remains permanent.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Changes made by the transaction survive system failures, crashes, or power outages.<\/li>\n\n\n\n<li>Data is saved reliably in persistent storage.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Example:<\/strong><br>After transferring money successfully, even if the system crashes immediately, the transferred amount will not be lost.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ACID properties ensure that databases operate reliably and predictably:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomicity:<\/strong> All or nothing<\/li>\n\n\n\n<li><strong>Consistency:<\/strong> Valid state maintained<\/li>\n\n\n\n<li><strong>Isolation:<\/strong> Transactions do not interfere<\/li>\n\n\n\n<li><strong>Durability:<\/strong> Changes are permanent<\/li>\n<\/ul>\n\n\n<div class=\"yoast-breadcrumbs\"><span><span><a href=\"https:\/\/gigz.pk\/sql\/\">Home<\/a><\/span> \u00bb <span class=\"breadcrumb_last\" aria-current=\"page\">Learn Advanced SQL &#038; Database Engineering (SQL-301) >Transactions &#038; Concurrency > ACID Properties<\/span><\/span><\/div>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773600895934\"><strong class=\"schema-faq-question\"><\/strong> <p class=\"schema-faq-answer\"><\/p> <\/div> <\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"menu_order":59,"template":"","class_list":["post-114","lesson","type-lesson","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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