Concurrency control | Transaction processing
Record locking is the technique of preventing simultaneous access to data in a database, to prevent inconsistent results. The classic example is demonstrated by two bank clerks attempting to update the same bank account for two different transactions. Clerks 1 and 2 both retrieve (i.e., copy) the account's record. Clerk 1 applies and saves a transaction. Clerk 2 applies a different transaction to his saved copy, and saves the result, based on the original record and his changes, overwriting the transaction entered by clerk 1. The record no longer reflects the first transaction, as if it had never taken place. A simple way to prevent this is to lock the file whenever a record is being modified by any user, so that no other user can save data. This prevents records from being overwritten incorrectly, but allows only one record to be processed at a time, locking out other users who need to edit records at the same time. To allow several users to edit a database table at the same time and also prevent inconsistencies created by unrestricted access, a single record can be locked when retrieved for editing or updating. Anyone attempting to retrieve the same record for editing is denied write access because of the lock (although, depending on the implementation, they may be able to view the record without editing it). Once the record is saved or edits are canceled, the lock is released. Records can never be saved so as to overwrite other changes, preserving data integrity. In database management theory, locking is used to implement isolation among multiple database users. This is the "I" in the acronym ACID. A thorough and authoritative description of locking was written by Jim Gray. (Wikipedia).
Storing Passwords - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
From playlist Applied Cryptography
File Encryption - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
From playlist Applied Cryptography
Storing Passwords Solution - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
From playlist Applied Cryptography
How to Erase Private Data From Old Drives
PC World explains how to completely erase sensitive data from old drives before recycling or discarding them. Visit www.pcworld.com/videos for more news, reviews and how-to's.
From playlist awareness
A USB drive is a small, removable hard drive that plugs into a USB port on your computer. To learn more about USB Drives visit: https://edu.gcfglobal.org/en/computerbasics/bringing-your-files-with-you/1/ We hope you enjoy!
From playlist Computer Basics
position:fixed juddering (real device)
Mirroring my phone to computer to record, you can see the same position:fixed juddering occurs in iOS 5.1.1
From playlist position:fixed
Fundamental concepts of intrusion detection are discussed. Various types of intrusion are analyzed. Password management is explained.
From playlist Network Security
Anti-destruction device for laptop
The Lenovo Tapes | Anti-destruction device for laptop
From playlist Lenovo: For Those Who Do.
Lecture 12: Distributed Transactions
Lecture 12: Distributed Transactions MIT 6.824: Distributed Systems (Spring 2020) https://pdos.csail.mit.edu/6.824/
From playlist MIT 6.824 Distributed Systems (Spring 2020)
Embedded Recipes 2018 - Finding sources of latency in your system - Steven Rostedt
Having just an RTOS is not enough for a real-time system. The hardware must be deterministic as well as the applications that run on the system. When you are missing deadlines, the first thing that must be done is to find what is the source of the latency that caused the issue. It could be
From playlist Embedded Recipes 2018
Highline Excel 2013 Class Video 20: VLOOKUP, DGET & MATCH For Looking Up Records 7 Examples
Download workbook: http://people.highline.edu/mgirvin/AllClasses/214_2013/214/Busn214_2013.htm This is the Highline Community College Class, Spreadsheet Construction taught by Michael Girvin: Basic To Advanced Excel. Topics in this video: 1. VLOOKUP to retrieve whole record change columns
From playlist Highline Complete Excel 2013 Class: Comprehensive Excel (Basics To Advanced)
Lock-Free to Wait-Free Simulation in Rust
In this stream, we start implementing the concurrency algorithm from the academic paper "A Practical Wait-Free Simulation for Lock-Free Data Structures" by Erez Petrank and and Shahar Timnat in Rust. The paper details a general way to turn lock-free concurrent data-structures into wait-fre
From playlist Practical Wait-Free Simulation
Lec 20 | MIT 6.033 Computer System Engineering, Spring 2005
Multi-site Atomicity View the complete course at: http://ocw.mit.edu/6-033S05 License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
From playlist MIT 6.033 Computer System Engineering, Spring 2005
Ctrl + Shift + Enter: Excel Array Formulas 16: Formulas To Extract Records With Criteria 23 examples
Download files here: http://people.highline.edu/mgirvin/excelisfun.htm EXCEL ARRAY FORMULAS WORK THE SAME IN ANY VERSION OF EXCEL!!! This video covers: 1. (00:34 min) Why use formulas to extract records from table, when there is the Filter feature? 2. (02:16 min) Formulas to extract recor
From playlist Excel Extract Data (Records) From Table / List / Database: Playlist of Videos
The first 100 people to go to https://blinkist.com/stevemould will get unlimited access for 1 week to try it out. You'll also get 25% off if you want full membership. Gaining unauthorised entry to someone else's car is illegal. Jamming is illegal in the UK. It might be illegal where you l
From playlist Best of
Highline Excel 2016 Class 16: Conditional Formatting to Visualize Data: Built-in & Logical Formulas
Download Files: https://people.highline.edu/mgirvin/AllClasses/218_2016/218Excel2016.htm In this video learn about Conditional Formatting Topics : 1. (00:16) Introduction 2. (00:43) Built-in Feature: Cell Contains 3. (03:28) Logical Formula: Highlight Row (Record) where cell contains a v
From playlist Excel Advanced Free Course at YouTube. Comprehensive Excel 2016: Calculations & Data Analysis (27 Videos)
Lecture 13: Spanner MIT 6.824: Distributed Systems (Spring 2020) https://pdos.csail.mit.edu/6.824/
From playlist MIT 6.824 Distributed Systems (Spring 2020)
EnCase Computer Forensics Demo
This is a short demo of EnCase I worked up. If you are interested in some of what professional computer forensics software can do then this is for you.
From playlist digital forensics
Slaying Excel Dragons Book #53: Defined Name Formula Dynamic Ranges For Charts and Array Formulas
Download files: http://people.highline.edu/mgirvin/ExcelIsFun.htm Learn Excel from beginning to end. Complete Lessons about Excel. This video accompanies the book: Slaying Excel Dragons, ISBN 978-1-61547-000-6 9781615470006 No Pages in Book Topics 1. Create Defined Name Formulas for Dynami
From playlist Slaying Excel Dragon Videos: Comprehensive Excel 2010 Lessons. (53 Videos)