Posts made by b6

@rashmiee Yes #QT one of the famous framework. But however, In any language, Please improve your skills in core. Then move to frameworks. Because nowadays most developers are depending on framework, Some times you will need to modify the framework or need to work on company's custom framework or need to move to different framework. In that situation you will face hard time. Because you only able to work on perticular framework. Understand the core technologies, standards and methologies. Then you can adapt your self to work on any platform and framework.

Good Luck!

Nice artical Bro

C++ is a low level language, And compatible with all platforms. But you should compile it to the current platfrom's executable format. Which means, You don't need to change your code, But you need to compile it for windows, linux & etc.. separately..

However you shuold start from C++. Learn to code using C++. If your google for tutorial you can find alots of resources.

Note: C++ is a strongly typed low level language, So you should learn about low level process architectures such as Hardware compatibles, Registers, CPU architectures & etc....

@dev_lak Thank you bro!

When share my posts on some other websites from lankadev, It shows my profile photo as preview, Instead of fetching photos from article. Will you guys look into this please?

@hashan well, Then can you explain the array sequense of your problem?

Prediction is a part of ML and AI. You need to train your algorithm with data and patterns to analyse. This is called machine learing. There are few ML frameworks are available. Those are specially designed for Data Analytics and Machine Learning. You can't do it with vanilla script. If you want, You need to create your own ML framework your self.

Learn Tensoflow.js

Uhhh.... Sounds good. If you post in English, You article will get more reach. Because not everyone knows sinhala much. (Including me) :)

@dinlinux Thank you!

@Piumal-Kavinda Yes, You can apply. The logical load-balances handles the virtual instances. And physical machanism used to manage the parent instance.

And nowadays no one using Virtual Architecture with Virtual Machines because of performance and scalability. Use containers instead of VMs.

Docker & Kubernate are rocking today's architecture,

@Piumal-Kavinda thank you

There a lots of courses available. In SLIIT thare is a digree called Computer Systems & Network Engineering (Note:I am not branding SLIIT)

@root Thx dude

There is no different, Usually brackets used to grouping the calculation and get final value..

Instead of,

$amount = $price - $discount;
return $amount;

You can use,

return ($price - $discount);

But in your case, $row is an Array. Array is a single element, So no need brackets..

@rachitha Thx bro

@Malith thx bro

@dev_lak thanks bro

Database Replication is a mechanism whereby data is available in more than one location. It means, Having more than one database server and replicating all the data in all available database servers.

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Why Database Replication 🙄🙄 ?

The Data-Centers or Large Scale Application Systems are handling millions of queries per second. This kind of continuous huge requests can create very very huge traffic and collision over the network. So there are many possibilities for Server Brake Down or Down Time 😥😥😥 .

To avoid this, If one database server fail, We need to provide data from another server until the failed server up again. And also we can reduce a load of a server by having more database instances ⚖ .

For that we need no sync data from a main server to other servers. This syncing process can be synchronous or Asynchronous. But it will happen continuously..

So this process Syncing data between database servers to increase availability called Replication.

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Master - Slave Architecture

In Database Replication, Most Engineers go with a very efficient architecture called Master - Slave.

In this architecture there will be database server called Master which has permission to Read and Write Data in Database.

Other side, There will be few database servers called Slaves which has permission only for Read the data.

Master servers can be one or more... But Slaves will be more than masters,
(Depends on the purpose and data size)

Master

This master database can Read and Write data in Database, But mostly used to write data.

When application wants to write the data, The query or request will be forwarded to one of the master server.

And also masters will sync the data to their slaves.

Slaves

Slaves are only able to read the data from database. So when application want to read a data, The query or request will be forwarded to one of the slave.

When slaves down, and there are no slaves to handle, The master will handle and read data.

Slaves are fetching chances from master databases to keep them up to date.

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Conclusion

Master - Slave is a way to increase the database availability and provide Zero Down time. But it will cost more data storage. Because, When we replicate 5GB of data over 3 servers, It will be 3 x 5 = 15GB.

Current Databases are much faster than before. So it is not compulsory to implement replication for smaller level projects.

But when you want more scalability and availability, Then go with Replication

Cheers....... 💪💪💪💪