add n=notes in database system

kekeandzeyu · Jan 7, 2025 · ecc620d · ecc620d
1 parent cd4dfa9
commit ecc620d
Show file tree

Hide file tree

Showing 4 changed files with 27 additions and 16 deletions.
diff --git a/Writerside/images_database/b3-1-1.png b/Writerside/images_database/b3-1-1.png
diff --git a/Writerside/images_database/b3-2-1.png b/Writerside/images_database/b3-2-1.png
diff --git a/Writerside/images_database/b3-2-2.png b/Writerside/images_database/b3-2-2.png
diff --git a/Writerside/topics/Database-System.topic b/Writerside/topics/Database-System.topic
@@ -12,27 +12,17 @@
         <chapter title="1.1 SQL Introduction" id="1-1-sql-introduction">
             <p>SQL = Structured Query Language</p>
             <p>Although over 40 years old, it keeps re-emerging as the standard.</p>
-            <p>
-                <format color="BlueViolet">Features:</format>
-            </p>
+            <p><format color="BlueViolet">Features:</format></p>
             <list type="bullet">
                 <li>
-                    <p>
-                        <format color="Fuchsia">Declarative!</format>
-                    </p>
+                    <p><format color="Fuchsia">Declarative!</format></p>
                     <list type="bullet">
-                        <li>Specify
-                            <format style="italic">what</format>
-                            you want, not
-                            <format style="italic">how</format>
-                            to get it.
-                        </li>
+                        <li>Specify <format style="italic">what</format> you want, not <format style="italic">how</format>
+                            to get it.</li>
                     </list>
                 </li>
                 <li>
-                    <p>
-                        <format color="Fuchsia">Implemented widely</format>
-                    </p>
+                    <p><format color="Fuchsia">Implemented widely</format></p>
                     <list type="bullet">
                         <li>With varying levels of efficiency, completeness.</li>
                     </list>
@@ -845,5 +835,26 @@
             </compare>
         </chapter>
     </chapter>
-
+    <chapter title="3 Disks &amp; Drives" id="3-disks-drives">
+        <chapter title="3.1 DBMS Architectures" id="3-1-database-architecture">
+            <img src="../images_database/b3-1-1.png" alt="Database Architecture"/>
+            <p><format color="BlueViolet">Features</format></p>
+            <list type="bullet">
+                <li>Organized in layers</li>
+                <li>Each layer abstracts the layer below: Manage complexity (easy to use) &amp;
+                    Performance assumptions (assume the perfomrance of lower layers)</li>
+                <li>Two cross-cutting issues related to storage and memory management:
+                    Concurrency control &amp; Recovery</li>
+            </list>
+        </chapter>
+        <chapter title="3.2 Disks" id="3-2-disks">
+            <p><format color="BlueViolet">Memory Hierarchy</format></p>
+            <img src="../images_database/b3-2-1.png" alt="Memory Hierarchy"/>
+            <p><format color="BlueViolet">Disk Components</format></p>
+            <img src="../images_database/b3-2-2.png" alt="Disk Components"/>
+            <p>Platters spin together (around 15000 rpm). Arm assembly can move in or out to position a head on a
+                desired track, but only one head reads/writes at any one time.</p>
+            <p><format color="BlueViolet">Disk Operation &amp; Access Time</format></p>
+        </chapter>
+    </chapter>
 </topic>