In the Oracle RDBMS environment, redo logs comprise files in a proprietary format which log a history of all changes made to the database. Each redo log file consists of redo records. A redo record, also called a redo entry, holds a group of change vectors, each of which describes or represents a change made to a single block in the database. For example, if a user UPDATEs a salary-value in a table containing employee-related data, the DBMS generates a redo record containing change-vectors that describe changes to the data segment block for the table. And if the user then COMMITs the update, Oracle generates another redo record and assigns the change a "system change number" (SCN). Whenever something changes in a datafile, Oracle records the change in the redo log. The name redo log indicates its purpose: If the database crashes, the RDBMS can redo (re-process) all changes on datafiles which will take the database data back to the state it was when the last redo record was written. DBAs use the views V$LOG, V$LOGFILE, V$LOG_HISTORY and V$THREAD to find information about the redo log of the database. Each redo log file belongs to exactly one group (of which at least two must exist). Exactly one of these groups is the CURRENT group (can be queried using the column status of v$log). Oracle uses that current group to write the redo log entries. When the group is full, a log switch occurs, making another group the current one. Each log switch causes checkpoint, however, the converse is not true: a checkpoint does not cause a redo log switch. One can also manually cause a redo-log switch using the ALTER SYSTEM SWITCH LOGFILE command. (Wikipedia).
Lesson going over the basics of redox chemistry from IGCSE Chemistry
From playlist Chemistry
Connecting React & Redux - Redux Tutorial #7
React and Redux play together REALLY well. Here's how to connect your Redux store with a React.js application. As you can see, using React + Redux makes your application very scalable. Redux provides a complete application state and React is just the view layer, so as Redux changes, Rea
From playlist Redux Tutorials
More videos like this online at http://www.theurbanpenguin.com Using time based redirection with apache and mod_rewrite we can display a different web page for different times of the day
From playlist Learning Apache HTTP Server
In this video, we simplify a logarithm.
From playlist Logs - Worked Examples
Basic Redux Introduction - Redux Tutorial #3
Let's build a bare-bones Redux app to help you understand how simple it can be. Redux is incredibly simple once you understand where everything goes and what's happening under the hood. GET THE CODE! https://github.com/learncodeacademy/react-js-tutorials In this React Redux tutorial, I
From playlist Redux Tutorials
quick review of how to resize an image in Geogebra
From playlist Geogebra
Redux Middleware Tutorial - Redux Tutorial #5
Redux middleware is awesome, it allows you to keep the simplicity of Redux, yet extend it's functionality. Adding global things like loggers, error handlers, etc are incredibly simple. In this react redux tutorial, we're going to create a redux logger middleware and error handling middle
From playlist Redux Tutorials
Lec 17 | MIT 6.033 Computer System Engineering, Spring 2005
Recoverability 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
Describes the Write-Ahead-Log Internals of PostgreSQL system. Improvements in WAL system that can be done to improve the performance. PostgreSQL uses WAL files to perform Crash recovery, Point In Time Recovery and Streaming Replication. This article will cover details of WAL system in Pos
From playlist Database
RedDotRuby 2014 - Ruby.inspect by Koichi Sasada
Help us caption & translate this video! http://amara.org/v/FGZL/
From playlist RedDotRuby 2014
Lec 18 | MIT 6.033 Computer System Engineering, Spring 2005
Isolation 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
Bitcoin Protocol Tutorial: Proof of Work
Bitcoin Protocol Paper Playlist: http://www.youtube.com/watch?v=UieiMU-ImvI&list=PLQVvvaa0QuDcq2QME4pfeh0cE71mkb_qz&feature=share All Bitcoin Videos Playlist: http://www.youtube.com/watch?v=UieiMU-ImvI&feature=share&list=PLQVvvaa0QuDebbCxrDPCux6SzC1RET4mF In this Bitcoin protocol tutoria
From playlist Bitcoin Satoshi Paper Explained
How To Create Two Factor Authentication For Your Website | Session 07 | #programming
Don’t forget to subscribe! In this project series, you will learn to create two factor authentication for your website. You will learn to build an E-Authentication System Using Quick Response Code and One Time Password in C# ASP.NET Through this series, you will learn all the details ne
From playlist Create Two Factor Authentication For Your Website
Differentiating Exponentials with Other Bases (3 of 3: Establishing the formula)
More resources available at www.misterwootube.com
From playlist Differential Calculus
How To Build An E-Authentication System Using OTP (One Time Password) | Session 07 | #programming
Don’t forget to subscribe! In this project series, you will learn to build an e-authentication system using OTP (One Time Password). This project covers details and requirements needed for adding QR codes and One Time Password to your website as an additional security layer. This serie
From playlist Build An E-Authentication System Using OTP (One Time Password)
Lec 19 | MIT 6.033 Computer System Engineering, Spring 2005
Transactions and Consistency 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
Log Transformations with a TI-NSPIRE
I create data from expontial and power equations, make scatter plots out of that data and then show you how to transform those plots so they are linear. This is known as log transformations in statistics. Check out http://www.ProfRobBob.com, there you will find my lessons organized by cl
From playlist TI-NSPIRE
From playlist Getting Started in Cryo-EM
React Redux Tutorial | Redux Tutorial for Beginners | React Redux Training | Edureka
🔥 Edureka ReactJS Training - https://www.edureka.co/reactjs-redux-certification-training This Edureka video on React Redux Tutorial will help you in understanding the fundamentals of Redux and help you in integrating Redux with React. This video helps you to learn following topics: 1. Nee
From playlist ReactJS Tutorial Videos | Edureka
Inequalities for Math Olympiad: Basic Logarithm Inequality(Part 1)
This is part 1 of the topic on Basic Logarithm Inequality with an outline of the proof. Example use of this fact will be presented in next few videos
From playlist Inequalities for Math Olympiad Series