{"id":103477,"date":"2025-01-20T17:07:54","date_gmt":"2025-01-20T11:37:54","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/acid-properties-in-dbms\/"},"modified":"2025-01-20T17:41:26","modified_gmt":"2025-01-20T12:11:26","slug":"acid-properties-in-dbms","status":"publish","type":"post","link":"https:\/\/www.mygreatlearning.com\/blog\/acid-properties-in-dbms\/","title":{"rendered":"ACID Properties in DBMS"},"content":{"rendered":"\n<p>When it comes to managing data in a <a href=\"https:\/\/www.mygreatlearning.com\/blog\/dbms-tutorial\/\">DBMS<\/a>, transaction reliability and data integrity are top priorities. ACID properties are the cornerstone of achieving these goals.&nbsp;<\/p>\n\n\n\n<p>By ensuring that each transaction is processed securely and consistently, the ACID properties (Atomicity, Consistency, Isolation, and Durability) form the backbone of transactional systems.&nbsp;<\/p>\n\n\n\n<p>In this blog, we\u2019ll dive deep into these essential principles and discuss how they help ensure that your data is safe, secure, and reliable under all circumstances.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"what-are-acid-properties\">What Are ACID Properties?<\/h2>\n\n\n\n<p>ACID properties are foundational principles in database management systems (DBMS) that ensure the reliability, accuracy, and integrity of data during transactions.&nbsp;<\/p>\n\n\n\n<p>This can include actions such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Changes to the files<\/li>\n\n\n\n<li>Removal of a record<\/li>\n\n\n\n<li>Transferring the funds<\/li>\n<\/ul>\n\n\n\n<p>The ACID properties act as safeguard mechanisms against problems that may emanate from system failures, concurrent execution of transactions, or other unforeseen faults, guaranteeing expected performance.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"acid-properties-in-dbms\">ACID Properties in DBMS<\/h2>\n\n\n\n<p>The <strong>ACID<\/strong> stands for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomicity<\/strong> \u2013 Transactions are all-or-nothing operations.<\/li>\n\n\n\n<li><strong>Consistency<\/strong> \u2013 Transactions maintain the database in a valid &amp; reliable state.<\/li>\n\n\n\n<li><strong>Isolation <\/strong>\u2013 Transactions don\u2019t interfere with each other.<\/li>\n\n\n\n<li><strong>Durability<\/strong> \u2013 Committed transactions are permanent even after failures.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"1-atomicity\"><strong>1. Atomicity<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image aligncenter size-full zoomable\" data-full=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/atmocity.png\"><img decoding=\"async\" width=\"602\" height=\"542\" src=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/atmocity.png\" alt=\"What is Atomicity\" class=\"wp-image-103508\" srcset=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/atmocity.png 602w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/atmocity-300x270.png 300w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/atmocity-150x135.png 150w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/figure>\n\n\n\n<p>Atomicity means a transaction is treated as a whole unit. That means either all operations in the transaction are done or none of them.<\/p>\n\n\n\n<p>This mechanism assists in eliminating the partial updates to the database, that can result in inaccurate data or data inconsistencies.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n\n<p>Consider a fund transfer between two bank accounts:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Debit $5021 from Account A.<\/li>\n\n\n\n<li>Credit $5021 to Account B.<\/li>\n\n\n\n<li>If the first operation (debiting Account A) succeeds but the second operation (crediting Account B) fails due to a network or system error, the transaction will be rolled back, and Account A will not be debited.<\/li>\n<\/ol>\n\n\n\n<p><strong>Importance<\/strong>:<\/p>\n\n\n\n<p>Atomicity ensures that the database never ends up in an intermediate state. Transactions are either fully applied or not applied at all.<\/p>\n\n\n\n<p><strong>How DBMS Ensures Atomicity<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Undo Logs<\/strong>: Changes implemented during a transaction procedure are maintained under the undo logs. If the transaction fails, those logs are used to reverse the changes back that were implemented.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Commit and Rollback Protocols<\/strong>: The DBMS only commits a transaction if all operations are successful. If any operation fails, the transaction is rolled back.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-consistency\"><strong>2. Consistency<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image aligncenter size-full zoomable\" data-full=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/consistency-dbms.png\"><img decoding=\"async\" width=\"506\" height=\"482\" src=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/consistency-dbms.png\" alt=\"Consistency DBMS\" class=\"wp-image-103512\" srcset=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/consistency-dbms.png 506w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/consistency-dbms-300x286.png 300w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/consistency-dbms-150x143.png 150w\" sizes=\"(max-width: 506px) 100vw, 506px\" \/><\/figure>\n\n\n\n<p>Consistency ensures that a transaction takes the database from one valid state to another, adhering to all predefined rules, constraints, and relationships. It ensures the database remains in a consistent state both before and after a transaction.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n\n<p>When a database has a constraint of foreign key, getting rid of a parent record without removing its child records would break the constraint &amp; lead to inconsistency. Systems that maintain consistency ensure these invalid actions don't occur.<\/p>\n\n\n\n<p><strong>Importance<\/strong>:<\/p>\n\n\n\n<p>Consistency safeguards <strong>data integrity<\/strong> by preventing operations that could corrupt the database and ensures that every transaction respects the rules defined for the database schema, including:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Primary and foreign key constraints.<\/li>\n\n\n\n<li>Check constraints (e.g., salary cannot be negative).<\/li>\n\n\n\n<li>Data type and domain rules.<\/li>\n<\/ol>\n\n\n\n<p><strong>How DBMS Ensures Consistency<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Constraint Enforcement<\/strong>: Constraints are authenticated before committing any of the transactions and if any of the rules will be ignored, the transaction will be aborted.<\/li>\n\n\n\n<li><strong>Triggers<\/strong>: Custom rules defined using triggers assists in maintaining the consistency by automating rightful approaches &amp; actions.<\/li>\n<\/ul>\n\n\n\n<p>Normalization plays a crucial role in maintaining database consistency. Learn more about <a href=\"https:\/\/www.mygreatlearning.com\/blog\/normalization-in-sql\/\">Normalization in SQL<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-isolation\"><strong>3. Isolation<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image aligncenter size-full zoomable\" data-full=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/isolation-dbms.png\"><img decoding=\"async\" width=\"662\" height=\"408\" src=\"http:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/isolation-dbms.png\" alt=\"Isolation in DBMS\" class=\"wp-image-103516\" srcset=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/isolation-dbms.png 662w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/isolation-dbms-300x185.png 300w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/isolation-dbms-150x92.png 150w\" sizes=\"(max-width: 662px) 100vw, 662px\" \/><\/figure>\n\n\n\n<p>Isolation ensures that transactions are executed independently of one another. The intermediate state of a transaction is invisible to all the other transactions until it is executed.<\/p>\n\n\n\n<p>This prevents conflicts &amp; delivers accurate results when multiple transactions are executed.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n\n<p>Assume two transactions:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Transaction 1: Updates Account A's balance.<\/li>\n\n\n\n<li>Transaction 2: Reads Account A's balance.<\/li>\n\n\n\n<li>Without isolation, Transaction 2 might read the intermediate state of Transaction 1, resulting in incorrect data. Isolation ensures that Transaction 2 either reads the balance before or after Transaction 1 concludes.<\/li>\n<\/ol>\n\n\n\n<p><strong>How DBMS Ensures Isolation<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Locking Mechanisms<\/strong>: Shared and exclusive locks control access to data during a transaction.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Multiversion Concurrency Control (MVCC)<\/strong>: Creates multiple versions of data, allowing transactions to access consistent snapshots without blocking each other.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-durability\"><strong>4. Durability<\/strong><\/h3>\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized zoomable\" data-full=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/durability.png\"><img decoding=\"async\" width=\"602\" height=\"656\" src=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/durability.png\" alt=\"Durability\" class=\"wp-image-103517\" style=\"width:497px;height:auto\" srcset=\"https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/durability.png 602w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/durability-275x300.png 275w, https:\/\/www.mygreatlearning.com\/blog\/wp-content\/uploads\/2025\/01\/durability-150x163.png 150w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><\/figure>\n\n\n\n<p>Durability ensures that once a transaction is committed, its changes become permanent. The effects of the transaction persist even in the event of system crashes, power failures, or hardware issues.<\/p>\n\n\n\n<p><strong>Example<\/strong>:<\/p>\n\n\n\n<p>After successfully transferring $500 from Account A to Account B, a sudden power outage occurs. Upon system recovery, the changes (debit from Account A and credit to Account B) remain intact in the database.<\/p>\n\n\n\n<p><strong>How DBMS Ensures Durability<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Transaction Logs<\/strong>: Changes made during a transaction are recorded in transaction logs before the changes are applied. In the event of a failure, the logs are used to restore the committed changes.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Write-Ahead Logging (WAL)<\/strong>: Ensures logs are written to stable storage before the changes are made to the database.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Backups and Replication<\/strong>: Periodic backups and data replication ensure durability in case of catastrophic failures.<\/li>\n<\/ul>\n\n\n\n<p><strong>Suggested Read:&nbsp;<\/strong><a href=\"https:\/\/www.mygreatlearning.com\/blog\/sql-commands\/\">Types of SQL Commands<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"advantages-and-disadvantages-of-acid-properties\">Advantages and Disadvantages of ACID Properties<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td><strong>Aspect<\/strong><strong><\/strong><\/td><td><strong>Advantages<\/strong><strong><\/strong><\/td><td><strong>Disadvantages<\/strong><\/td><\/tr><tr><td><strong>Atomicity<\/strong><strong><\/strong><\/td><td>- Ensures all-or-nothing execution, preventing partial changes to data. - Can introduce overhead in rolling back incomplete transactions, especially for complex systems.<\/td><td>- Protects against data corruption during failures.<br>- May require additional resources for managing undo logs or checkpoints.<\/td><\/tr><tr><td><strong>Consistency<\/strong><\/td><td>- Maintains data integrity by enforcing constraints and rules. - Strict consistency checks can reduce performance in high-throughput environments.<\/td><td>- Prevents invalid states, ensuring reliability of the system.<br>- Requires thorough schema design and may limit flexibility in certain applications.<\/td><\/tr><tr><td><strong>Isolation<\/strong><strong><\/strong><\/td><td>- Enables concurrent transactions without interference, ensuring data accuracy.<br>- High isolation levels (e.g., Serializable) can lead to decreased concurrency and performance bottlenecks.<\/td><td>- Prevents issues like dirty reads, phantom reads, and non-repeatable reads. - Requires careful trade-offs between isolation and system scalability.<\/td><\/tr><tr><td><strong>Durability&nbsp;<\/strong><\/td><td>- Guarantees data persistence even in the event of crashes or power failures.<br>- Requires robust storage solutions, which may increase costs.<\/td><td>- Increases user trust by ensuring committed transactions are permanent.<br>- Write-ahead logging and backups may slow down transaction processing.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Suggested Read:<\/strong>&nbsp;<a href=\"https:\/\/www.mygreatlearning.com\/blog\/functional-dependency-in-dbms\/\">DBMS Interview Questions<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"how-acid-properties-work-in-real-world-applications\">How ACID Properties Work in Real-World Applications?<\/h2>\n\n\n\n<p>ACID properties are fundamental to maintaining the reliability, consistency, and security of data in real-world systems.&nbsp;<\/p>\n\n\n\n<p>They are critical in scenarios where the integrity of transactions has a direct impact on user trust, operational efficiency, and compliance with regulatory standards.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"acid-compliance-in-popular-databases\"><strong>ACID Compliance in Popular Databases<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-mysql\"><strong>1. MySQL<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Storage Engines<\/strong>:<\/li>\n\n\n\n<li>MySQL achieves ACID compliance through storage engines like <strong>InnoDB<\/strong>.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomicity<\/strong>: Handled via rollback and commit mechanisms.<\/li>\n\n\n\n<li><strong>Consistency<\/strong>: Maintained by enforcing constraints like foreign keys and checks.<\/li>\n\n\n\n<li><strong>Isolation<\/strong>: Supports multiple isolation levels, including Serializable.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Write-ahead logging (WAL) ensures that committed changes are persistent.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2-postgresql\"><strong>2. PostgreSQL<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PostgreSQL is fully ACID-compliant by design.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomicity<\/strong>: Implements multiversion concurrency control (MVCC) and uses transaction logs for rollbacks.<\/li>\n\n\n\n<li><strong>Consistency<\/strong>: Strong schema validation and constraints ensure consistency.<\/li>\n\n\n\n<li><strong>Isolation<\/strong>: Supports all four standard isolation levels, with Serializable being the default.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: WAL ensures transaction durability even in case of system crashes.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-oracle-database\"><strong>3. Oracle Database<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oracle databases are renowned for their strong ACID compliance.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Atomicity<\/strong>: Ensured through undo segments and transaction management.<\/li>\n\n\n\n<li><strong>Consistency<\/strong>: Enforces strict adherence to database constraints and validations.<\/li>\n\n\n\n<li><strong>Isolation<\/strong>: Provides advanced concurrency control mechanisms and supports Serializable transactions.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Uses redo logs and backups to safeguard data.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"real-world-examples-of-acid-properties\"><strong>Real-World Examples of ACID Properties<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"1-e-commerce-systems\"><strong>1. E-Commerce Systems<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Scenario<\/strong>: Online shopping cart and inventory management.<\/li>\n\n\n\n<li><strong>Atomicity<\/strong>: A customer\u2019s purchase transaction is either completed in full (deducting the payment and reducing inventory) or aborted if any part fails. For instance, if payment processing fails, the inventory is not reduced.<\/li>\n\n\n\n<li><strong>Consistency<\/strong>: Ensures that the total stock is always accurate and matches the database constraints (e.g., no negative stock levels).<\/li>\n\n\n\n<li><strong>Isolation<\/strong>: Multiple consumers purchasing the similiar product cocurrently are handled independently to prevent overselling.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Once an order is placed and confirmed, the transaction remains intact, even if the system crashes afterward.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"2-banking-systems\"><strong>2. Banking Systems<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Scenario<\/strong>: Fund transfers between accounts.<\/li>\n\n\n\n<li><strong>Atomicity<\/strong>: A transfer debits the sender\u2019s account and credits the recipient\u2019s account as a single atomic operation. If either step fails, the entire transaction is rolled back.<\/li>\n\n\n\n<li><strong>Consistency<\/strong>: Ensures that the total amount across all accounts remains consistent. No money is created or lost during the transaction.<\/li>\n\n\n\n<li><strong>Isolation<\/strong>: Concurrent transactions, such as various users transferring funds, are operated independently to prevent issues like double or duplicate withdrawals.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Once a transfer is committed, it is logged and cannot be lost, even during a system failure.<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"3-healthcare-systems\"><strong>3. Healthcare Systems<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Scenario<\/strong>: Managing electronic medical records (EMRs).<\/li>\n\n\n\n<li><strong>Atomicity<\/strong>: Updating a patient\u2019s medical record to include a diagnosis and prescribed treatment must succeed as a whole. If any part fails, the changes are reverted.<\/li>\n\n\n\n<li><strong>Consistency<\/strong>: Ensures that all updates follow medical data integrity rules, such as valid references to a doctor or department.<\/li>\n\n\n\n<li><strong>Isolation<\/strong>: Concurrent updates, like lab results and physician notes being added to a patient\u2019s record, are handled separately to avoid data conflicts.<\/li>\n\n\n\n<li><strong>Durability<\/strong>: Patient records remain safe &amp; easily accessible for the firsthand information even if the system experiences a crash or power failure.<\/li>\n<\/ul>\n\n\n\n<p><strong>Suggested:<\/strong> Look at these <a href=\"https:\/\/www.mygreatlearning.com\/blog\/hands-on-sql-projects\/\">Hands-On SQL Projects<\/a> to build your skills and portfolio.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\">Conclusion<\/h2>\n\n\n\n<p>ACID properties are highly crucial for maintaining the accuracy as well as the durability of data in complex transactional environments.&nbsp;<\/p>\n\n\n\n<p>Despite some challenges related to performance &amp; scalability, the advantages they deliver in ensuring consistency are indispensable.&nbsp;<\/p>\n\n\n\n<p>To master these concepts and more, explore Great  Learning\u2019s <a href=\"https:\/\/www.mygreatlearning.com\/software-engineering\/courses\">Software Engineering courses<\/a>.&nbsp;<\/p>\n\n\n\n<p>Our programs are designed to give you hands-on experience with real-world applications in software development, equipping you with the skills necessary to succeed in today\u2019s tech-driven industries.<\/p>\n\n\n\n<p>To master related concepts like functional dependencies, visit our guide on <a href=\"https:\/\/www.mygreatlearning.com\/blog\/functional-dependency-in-dbms\/\">Functional Dependency in DBMS<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Explore how ACID properties (Atomicity, Consistency, Isolation, Durability) in DBMS ensure reliable transactions.<\/p>\n","protected":false},"author":41,"featured_media":103485,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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