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Consists of the explanations of the basics of SQL and commands of SQL.Helpful for II PU NCERT students and also degree studeents to understand some basic things.
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PL/SQL is a combination of SQL along with the procedural features of programming languages.
It provides specific syntax for this purpose and supports exactly the same datatypes as SQL.
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Introduction and Basics to web technology .pptxLEENASAHU42
Introduction: Web system architecture- 1,2,3 and n tier
architecture, URL, domain name system, overview of
HTTP , Web Site Design Issues and Introduction to role of
SEO (Search Engine Optimization) on web page
development.
Slides ch-5-the definitive guide to cloud computing -by- dan sullivanMeherFatima8
The topic focuses on how to plan for the organizational and technical issues around the move to cloud computing, it is specifically structured around the broad topics like planing principle etc. Moreover you can visit :https://www.behangservicenederland.com/glasvezelbehang.html
Dated: 19th July 2009
By:Shahzad Sarwar To: Related Project Managers/Consultants,Client
Case Study:
To sync data of different branches of office via replication who are running Comsoft application named PCMS.
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Data privacy is one of the most critical issues that businesses face. This presentation shares insights on the principles and best practices for ensuring the resilience and security of your workload.
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Your Digital Assistant.
Making complex approach simple. Straightforward process saves time. No more waiting to connect with people that matter to you. Safety first is not a cliché - Securely protect information in cloud storage to prevent any third party from accessing data.
Would you rather make your visitors feel burdened by making them wait? Or choose VizMan for a stress-free experience? VizMan is an automated visitor management system that works for any industries not limited to factories, societies, government institutes, and warehouses. A new age contactless way of logging information of visitors, employees, packages, and vehicles. VizMan is a digital logbook so it deters unnecessary use of paper or space since there is no requirement of bundles of registers that is left to collect dust in a corner of a room. Visitor’s essential details, helps in scheduling meetings for visitors and employees, and assists in supervising the attendance of the employees. With VizMan, visitors don’t need to wait for hours in long queues. VizMan handles visitors with the value they deserve because we know time is important to you.
Feasible Features
One Subscription, Four Modules – Admin, Employee, Receptionist, and Gatekeeper ensures confidentiality and prevents data from being manipulated
User Friendly – can be easily used on Android, iOS, and Web Interface
Multiple Accessibility – Log in through any device from any place at any time
One app for all industries – a Visitor Management System that works for any organisation.
Stress-free Sign-up
Visitor is registered and checked-in by the Receptionist
Host gets a notification, where they opt to Approve the meeting
Host notifies the Receptionist of the end of the meeting
Visitor is checked-out by the Receptionist
Host enters notes and remarks of the meeting
Customizable Components
Scheduling Meetings – Host can invite visitors for meetings and also approve, reject and reschedule meetings
Single/Bulk invites – Invitations can be sent individually to a visitor or collectively to many visitors
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Alerts & Notifications – Get notified on SMS, email, and application
Parking Management – Manage availability of parking space
Individual log-in – Every user has their own log-in id
Visitor/Meeting Analytics – Evaluate notes and remarks of the meeting stored in the system
Visitor Management System is a secure and user friendly database manager that records, filters, tracks the visitors to your organization.
"Secure Your Premises with VizMan (VMS) – Get It Now"
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top nidhi software solution freedownloadvrstrong314
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Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
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Unleash Unlimited Potential with One-Time Purchase
BoxLang is more than just a language; it's a community. By choosing a Visionary License, you're not just investing in your success, you're actively contributing to the ongoing development and support of BoxLang.
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Venez le découvrir lors de cette session ignite
Paketo Buildpacks : la meilleure façon de construire des images OCI? DevopsDa...
Odbc and data access objects
1.
2. EVOLUTION OF COMPUTING ARCHITECTURES
Aim: To discuss the evolution of client server
architecture for various computing models.
There are three system architectures,
1. Centralized system
2. File Server Architecture
3. Client server system
3. CENTRALIZED SYSTEM ARCHITECTURE
Companies that needed real computing
power turned to the mainframe computer,
which is a centralized system architecture.
Salient feature: Only movement of
marshalling are the keystrokes between the
client and the host machine.
Marshalling is the process of packaging
interface elements and sending them across process
boundaries.
4. In Centralized System, keystrokes are marshalled
from the terminal to the host.
Network Server
DATA
Terminal 1 Terminal 2 Terminal 3 Terminal 4
5. Merits
Excellent security
Centralized administration as both application
logic and data reside on the same machine
Demerits
Expensive to buy, lease, maintain and use.
Both the application and the database are housed
within the same machine process thereby offering no
way to truly partition the application logic beyond the
physical of the mainframe.
6. FILE SERVER ARCHITECTURE
• This brought a complete change in the
implementation of the computer architecture
• In this system, the application logic was
executed on the client workstation instead of
the server.
• These servers provide access to computing
resources like printers and large hard drives
7. File server architecture
Disk I/O Requests
Disk Blocks
DATA
Network Server
Workstation 1 Workstation 2 Workstation 3 Workstation 4
Application
Logic 1
Application
Logic 4
Application
Logic 3
Application
Logic 2
8. MERITS:
It has the low cost entry point with flexible
arrangement
Computer resources can be added or
reduced as and when necessary using this
system.
DEMERITS:
All application logic is executed on the
client machine. This results in the client
machine’s need for a large amount of power
to run the application.
9. CLIENT SERVER MODEL
This is a process involving a minimum of
two independent entities, one is the client and
the other is the server.
The client makes a request to the server
and the server services the requests and the
resulting data is sent to the client.
In this application, two separate applications
operating independently could work together
to complete a task.
10. SQL (Structured Query Language based Database
Management System)is the implementation of this
concept.
Disk I/O
Requests
Disk
DATA
Network Server
Workstation 1 Workstation 2 Workstation 3 Workstation 4
Application
Logic
Application
Logic
Application
Logic
Application
Logic
Application
logic
11. The most popular client server applications
revolve round the use of DBMS such as Oracle
and Microsoft SQL server. These applications
are referred to as back-ends and offer support
for storage, manipulation and retrieval of
business persistent data. They use SQL as a
standard method for submitting client
requests.
The significance of distributing the
application logic between the client and
server offers a faster and more cost-effective
performance.
12. File Server v/s Client Server Database
Deployment
With the advent and popularity of
Microsoft Access using the Microsoft
Database file(MDB) to store data, this is not
a client server implementation but a file
server implementation.
13. CASE STUDY
Assume that we have a set of data stored
in an MDB file namely Student_Info.mdb. This
file holds the details of the marks scored in
different subjects by students. A client want to
know as how many students scored 100% in
more than two subjects.
A query is sent to obtain the results.
14. Query Sent to a File Server System
• In this case, the query is not sent to the server.
• The logic of the query is processed and
evaluated at the client end itself.
• The query logic realizes that it needs to access a
table namely Student_Info in the MDB in order
to process the request.
• No logic is executed at the server end except the
transferring of file disk blocks.
15. Query Sent to a Client Server System
• Here the actual SQL statement is sent across the
network and processed by an application running
locally on the server machine
• As the SQL statements is processed on the server,
only the results need to be sent back to the client.
• Advantage: Reduced network traffic and an
incredibly quick execution time.
To meet the challenges presented by a
business environment, a new three-tier or n-tier
client server approach has been introduced
16. Two-Tier Client Server Model
• In this mode, a desktop machine operates as a
client and a network server functions as a back-end
database engine.
• The logic in a two-tier model is split between the
two physical locations namely the server and the
client.
• In Visual Basic, using any of the data controls
that provide a graphical link to the back-end
data source creates a two-tier client server
relationship.
17. Limitations of Two-Tier Client Server
Model
• Not Scalable Inability of a two-tier approach to
grow beyond the physical boundaries of a client
and server machine
• Unmanageable Business rules cannot be
encapsulated and deployed centrally because of
which sharing common processes and re-using
work becomes difficult
• Poor Performance The graphical interface
binding to the data consumes major resources
on the client machine which results in poor
performance and dissatisfied clients.
18. Three-Tier Client Server Model
• This model is based on the ability to build
partitioned applications.
• Partitioning an application breaks the code
into logical components.
• Each tier is called a service. These services are
shared between that client and the servers.
• The components can be logically grouped into
three tiers: user services, business services and
data services.
19. Service Location
User Services Client
Business logic Server
Data Services Server
The three-tier logic can be extended to
any number of tiers/services known as Multi-
Tier or n-tier architecture.
20. Values of the Three-Tier Client Server
Development
• Reuse The time invested in designing and
implementing components is not wasted as they
can be shared among applications.
• Performance As components can be placed on
machines other than the client workstation, load
processing can be shifted from a client machine
that may be underpowered to a server with extra
horsepower. This offers the user best possible
methods for each aspect of an application’s
execution, resulting in better performance.
21. • Manageability Encapsulation of application’s
services into components allows the user to
break down large, complex application’s into
more manageable parts.
• Maintenance Centralizing components for
reuse has an added benefit. They become
easier to redeploy after any amendments are
made in the order to keep pace with business
needs.