ACID bro

Author: Bhupesh-V

.vitepress/sidebar.js

@@ -159,6 +159,10 @@ export const sidebar = [
   {
     "text": "Databases",
     "items": [
+      {
+        "text": "ACID",
+        "link": "/databases/acid"
+      },
       {
         "text": "CHECK constraint v/s EXCLUSION constraint",
         "link": "/databases/check-constraint-vs-exclusion-constraint"

README.md

@@ -37,7 +37,7 @@
 <td><a href="#data-warehouse">Data Warehouse</a><sup>[1]</sup></td>
 </tr>
 <tr>
-<td><a href="#databases">Databases</a><sup>[13]</sup></td>
+<td><a href="#databases">Databases</a><sup>[14]</sup></td>
 <td><a href="#devops">Devops</a><sup>[8]</sup></td>
 <td><a href="#distributed-computing">Distributed Computing</a><sup>[3]</sup></td>
 </tr>
@@ -182,6 +182,7 @@
 ### Databases
 
 <ul>
+<li><a target="_blank" href="https://github.com/Bhupesh-V/til/blob/master/databases/acid.md">ACID</a></li>
 <li><a target="_blank" href="https://github.com/Bhupesh-V/til/blob/master/databases/check-constraint-vs-exclusion-constraint.md">CHECK constraint v/s EXCLUSION constraint</a></li>
 <li><a target="_blank" href="https://github.com/Bhupesh-V/til/blob/master/databases/clustered-non-clustered-indexes.md">Clustered & Non-clustered Indexes</a></li>
 <li><a target="_blank" href="https://github.com/Bhupesh-V/til/blob/master/databases/database-sharding.md">Collected notes on Database Sharding 🗃</a></li>

count.json

@@ -1,3 +1,3 @@
 {
- "count": 182
+ "count": 183
 }

databases/acid.md

@@ -0,0 +1,25 @@
+# ACID
+
+## Atomicity
+
+- If operations, when grouped together in "atomic" transactions fail to be comitted due to a fault, then the transaction is aborted.
+- _Abortability_ could have been a better term
+
+## Consistency
+
+- Defines the the database is in a "good state" which is highly subjective because you can violate data rules
+- Not a property of a database.
+- The application may rely on database's atomicity & isolation properties to achieve consistency (?)
+
+## Isolation
+
+- Concurrently running transactions are isolated from each other.
+
+## Durability
+
+- Promise that once a transaction has comitted successfully, any data it has written will not be forgotten, even if there's a hardware failure.
+- Single node = write to disk
+- Distributed = replicate
+
+
+Reference: DDIA

index.md

@@ -24,7 +24,7 @@
 <td><a href="#data-warehouse">Data Warehouse</a><sup>[1]</sup></td>
 </tr>
 <tr>
-<td><a href="#databases">Databases</a><sup>[13]</sup></td>
+<td><a href="#databases">Databases</a><sup>[14]</sup></td>
 <td><a href="#devops">Devops</a><sup>[8]</sup></td>
 <td><a href="#distributed-computing">Distributed Computing</a><sup>[3]</sup></td>
 </tr>
@@ -207,6 +207,7 @@
 ### Databases
 
 <ul>
+<li><a href="/databases/acid">ACID</a></li>
 <li><a href="/databases/check-constraint-vs-exclusion-constraint">CHECK constraint v/s EXCLUSION constraint</a></li>
 <li><a href="/databases/clustered-non-clustered-indexes">Clustered & Non-clustered Indexes</a></li>
 <li><a href="/databases/database-sharding">Collected notes on Database Sharding 🗃</a></li>