Added DQ and CAP system design notes.

docs/techs/OMSCS/CS6210-Advanced-Operating-Systems/index.md

@@ -1,6 +1,18 @@
 ---
-title: CS6210-AOS-Intro
 date: 'November 13, 2023'
 tags: ['OMSCS']
 ---
 
+# CS6210-AOS
+
+## Giant-Scale Services
+
+[Building Giant-Scale Services: Key Lessons](https://www.linkedin.com/pulse/building-giant-scale-services-key-lessons-nathaniel-payne/)
+
+[Lessons from Giant-Scale Services](https://people.eecs.berkeley.edu/~brewer/papers/GiantScale.pdf)
+
+[Summary: Lessons from giant-scale services](https://muratbuffalo.blogspot.com/2011/01/lessons-from-giant-scale-services.html)
+
+[Paper summary: Perspectives on the CAP theorem](https://muratbuffalo.blogspot.com/2015/02/paper-summary-perspectives-on-cap.html)
+
+[DBMS Musings](https://dbmsmusings.blogspot.com/)

docs/techs/System-Design/Grokking-the-system-design-interview/Problem-set/1.TinyURL.md

@@ -23,7 +23,7 @@ URL shortening is used to create shorter aliases for long URLs.
 
 ### Extended requirements
 
-* Telemetrics: how many times a rediction happened?
+* Telemetrics: how many times a reduction happened?
 * REST APIs by other service.
 
 ## Capacity Estimation and constriants
@@ -138,13 +138,13 @@ How to generate a short and unique key for a given URL?
 
 MD5sum to generate hash. 128 bits.
 
-#### How to resolve hash colission?
+#### How to resolve hash collision?
 
 Randomly pick up digits out of 128 bits.
 
 Append use name id or increasing counter in md5 hashing func.
 
-#### Generating keys offline
+#### Generating keys off-line
 
 Key Generation Service(KGS) in key-DB.
 

docs/techs/System-Design/basics/CAP.md

@@ -1,10 +1,10 @@
 ---
-title: CAP Theorem
 summary: Consistency, Availability, Partition 
 date: 'January 29, 2022'
 tags: ['System-Design']
 ---
 
+# CAP Theorem
 
 [IBM CAP doc](https://www.ibm.com/cloud/learn/cap-theorem)
 

docs/techs/System-Design/basics/DQ.md

@@ -0,0 +1,17 @@
+# Yield-Harvest
+
+Yield: queries completed / queries offered
+
+Harvest: data available / complete data.
+
+DQ Value = Data per query \* Queries/sec ~ constant
+
+[Building Giant-Scale Services: Key Lessons](https://www.linkedin.com/pulse/building-giant-scale-services-key-lessons-nathaniel-payne/)
+
+[Lessons from Giant-Scale Services](https://people.eecs.berkeley.edu/~brewer/papers/GiantScale.pdf)
+
+[Summary: Lessons from giant-scale services](https://muratbuffalo.blogspot.com/2011/01/lessons-from-giant-scale-services.html)
+
+[Paper summary: Perspectives on the CAP theorem](https://muratbuffalo.blogspot.com/2015/02/paper-summary-perspectives-on-cap.html)
+
+[DBMS Musings](https://dbmsmusings.blogspot.com/)