This document discusses transactions in database management systems. A transaction is a set of database operations that must be executed together as an atomic unit to maintain data integrity. Transactions have four main properties: atomicity, consistency, isolation, and durability (ACID). A transaction progresses through states from active to partially committed to either committed or aborted. Maintaining proper transaction execution and concurrent transaction processing is important for database consistency.
Transaction concept, ACID property, Objectives of transaction management, Types of transactions, Objectives of Distributed Concurrency Control, Concurrency Control anomalies, Methods of concurrency control, Serializability and recoverability, Distributed Serializability, Enhanced lock based and timestamp based protocols, Multiple granularity, Multi version schemes, Optimistic Concurrency Control techniques
This Presentation is about NoSQL which means Not Only SQL. This presentation covers the aspects of using NoSQL for Big Data and the differences from RDBMS.
ACID properties
Atomicity, Consistency, Isolation, Durability
Transactions should possess several properties, often called the ACID properties; they should be enforced by the concurrency control and recovery methods of the DBMS.
Distributed database system is collection of loosely coupled sites that are independeant of each other.
Distributed transaction model
Concurrency control
2 phase commit protocol
Transaction concept, ACID property, Objectives of transaction management, Types of transactions, Objectives of Distributed Concurrency Control, Concurrency Control anomalies, Methods of concurrency control, Serializability and recoverability, Distributed Serializability, Enhanced lock based and timestamp based protocols, Multiple granularity, Multi version schemes, Optimistic Concurrency Control techniques
This Presentation is about NoSQL which means Not Only SQL. This presentation covers the aspects of using NoSQL for Big Data and the differences from RDBMS.
ACID properties
Atomicity, Consistency, Isolation, Durability
Transactions should possess several properties, often called the ACID properties; they should be enforced by the concurrency control and recovery methods of the DBMS.
Distributed database system is collection of loosely coupled sites that are independeant of each other.
Distributed transaction model
Concurrency control
2 phase commit protocol
Relational databases vs Non-relational databasesJames Serra
There is a lot of confusion about the place and purpose of the many recent non-relational database solutions ("NoSQL databases") compared to the relational database solutions that have been around for so many years. In this presentation I will first clarify what exactly these database solutions are, compare them, and discuss the best use cases for each. I'll discuss topics involving OLTP, scaling, data warehousing, polyglot persistence, and the CAP theorem. We will even touch on a new type of database solution called NewSQL. If you are building a new solution it is important to understand all your options so you take the right path to success.
These slides are based on Distributed Transactions, which is also a type of internet transaction. Distributed Transaction is a database transaction in which two or more servers are involved.
Layer between OS and distributed applications,Hides complexity and heterogeneity of distributed system ,Bridges gap between low-level OS communications and programming language abstractions,Provides common programming abstraction and infrastructure for distributed applications.
PHP provides access to a great number of different database systems, many of which are relational in nature and can be interrogated using Structured Query Language (SQL).
Data modeling is a process used to define and analyze data requirements needed to support the business processes within the scope of corresponding information systems in organizations.
Unified Modeling Language (UML) is a modeling language, used for design. Designed based on OMG Standard, Object this helps to express and design documents, software. This is particularly useful for OO design. Here is a brief tutorial that talks about UML usage.
Relational databases vs Non-relational databasesJames Serra
There is a lot of confusion about the place and purpose of the many recent non-relational database solutions ("NoSQL databases") compared to the relational database solutions that have been around for so many years. In this presentation I will first clarify what exactly these database solutions are, compare them, and discuss the best use cases for each. I'll discuss topics involving OLTP, scaling, data warehousing, polyglot persistence, and the CAP theorem. We will even touch on a new type of database solution called NewSQL. If you are building a new solution it is important to understand all your options so you take the right path to success.
These slides are based on Distributed Transactions, which is also a type of internet transaction. Distributed Transaction is a database transaction in which two or more servers are involved.
Layer between OS and distributed applications,Hides complexity and heterogeneity of distributed system ,Bridges gap between low-level OS communications and programming language abstractions,Provides common programming abstraction and infrastructure for distributed applications.
PHP provides access to a great number of different database systems, many of which are relational in nature and can be interrogated using Structured Query Language (SQL).
Data modeling is a process used to define and analyze data requirements needed to support the business processes within the scope of corresponding information systems in organizations.
Unified Modeling Language (UML) is a modeling language, used for design. Designed based on OMG Standard, Object this helps to express and design documents, software. This is particularly useful for OO design. Here is a brief tutorial that talks about UML usage.
Transaction is a unit of program execution that accesses and possibly updates various data items.
Usually, a transaction is initiated by a user program written in a high-level data-manipulation language or programming language (for example, SQL,COBOL, C, C++, or Java), where it is delimited by statements (or function calls) of the form begin transaction and end transaction.
Why needed ACID properties?
->Failures of various kinds, such as hardware failures and system crashes
-> Concurrent execution of multiple transactions
->ACID properties in order to ensure accuracy, completeness, and data integrity.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
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Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
2. WHAT IS TRANSACTION?
A transaction is a set of changes that must all be
made together.
Collection of operations that form a single logical
unit of work are called TRANSACTIONS.
A database system must ensure proper execution
of transactions deplete failures.
It must manage concurrent execution of
transactions to avoid inconsistency.
3. A transaction is a unit of program execution that accesses
and possibly updates various data items. A program
contains statements of the form begin transaction and
end transaction. The transactions consists of all
operations executed between the begin transaction and
end transaction.
Database in
consistent state
Database in
consistent state
Begin
transaction
End
transaction
Execution of transaction
(In between its execution, database may be
in inconsistent state)
4. TRNSACTION CONCEPT
A transaction accesses data with a series of Read
and Write operations.
Read operation : Reading of a database object
means that it is, firstly, brought into main memory
from the disk and then its value is copied into a
program variable i.e.,
Disk to
Main memory Program Variableto
5. Similarly, during write operation, copy of the object is
first modified and then written to disk.
Program Variable
to
Main memory Diskto
Example: Let T be a transaction that transfers $50 from account A
to account B. This transaction can be defined as:
T : read(A)
A:=A-50
write(A)
read(B)
B:=B+50
write(B)
6. PROPERTIES OF TRANSACTION
There are four important properties of transaction(ACID):
Atomicity : A transaction is said to be atomic if a
transaction always executes all of its action in one step
or not execute any actions at all.
It implies that either all or none of the transaction’s
operations are performed.
7. Consistency : A transaction must preserve the
consistency of a database after its execution. It means
that the execution of a transaction must leave a
database in either its prior stable state or new stable
state.
If a transaction fails then the database must be
returned to its previous state.
If it is successful then the database must reflect new
changes.
8. Isolation : It means that the data used during the
execution of a transaction cannot be used by a second
transaction until the first one is completed.
The transactions do not interfere with each other. They
must behave as if they are executed in isolation.
This isolation property of a transaction is used in
multiuser database environments.
9. Durability : The effect of a completed or
committed transaction should persist even after
a system’s failure (crash).
It means that once a transaction commits, the
system must guarantee that result of its
operations will never be lost.
It is the responsibility of the recovery subsystem
of DBMS.
10. S.No. Property Meaning
1. Atomicity All or nothing
2. Consistency No violation of integrity
constraints
3. Isolation Concurrent changes invisible
4. Durability Committed update persist.
So, we can say that:
11. STATES OF TRANSACTION
A transaction can be in various states as shown below in
figure.
Transaction state diagram.
12. Active state: It is the initial state. The transaction stays
in this state while it is executing.
Partially committed state: When the final statement
has been executed, we say, transaction is in partially
committed state.
Failed state: When the normal execution can no longer
proceed, we say that the transaction is in a failed state.
Aborted state: A transaction is aborted if the
transaction has been rolled back and the database has
been restored to its state prior to the start of the
transaction.
Committed state: When a transaction has successfully
been completed.
13. Explanation:- A transaction starts in the active state.
When it finishes its last statement, it enters the
partially committed state. At this time, the
transaction has completed its execution but it is still
possible that it may have to be aborted as the actual
output may still be temporarily residing in the main
memory. DBMS then writes information to disk that
even if the system failure occurs, the update
performed by T can be recreated when the final or last
of this information is written out, the transaction
enters the committed state.