Program - Page 47

Learn basic programming with C, C++, Python, JavaScript, PHP, CSS, HTML5 programming languages. You can also find tutorials on databases, SQL Server here.

25 May 2019

What is a shell?

Shell is an environment in which we can run commands, programs and Shell scripts. There are different versions of Shell, which differ only from the version of the operating

25 May 2019

Use variables in Shell

A variable is a string of characters from which we assign a value. The assigned value can be a number, text, file name, device or any other type of data.

25 May 2019

Special variables in Unix / Linux

The previous tutorial has warned about using special characters in your variable name. This is because these characters are used in the names of special variables in Unix. These

25 May 2019

Use array in Shell

A shell variable is able to hold a single value. This type of variables is called scalar variables.

25 May 2019

Basic Shell operators

There are many operators supported by each Shell. Our tutorial is based on the default Shell (Bourne) so we are discussing Bourne shell operators in this chapter.

25 May 2019

C Shell operators

This tutorial lists all the operators available in C Shell. Here, most operators are similar to those we have in the C Programming Language.

25 May 2019

Korn Shell Operator

This tutorial lists all the operators available in the Korn Shell. Here most of these operators are similar to what we have in the C Program language.

25 May 2019

Aggregation in MongoDB

Aggregation can be understood as aggregation. The Aggregation operation handles data records and returns calculated results. The operations group the values from multiple

25 May 2019

ObjectId in MongoDB

You have seen the use of MongoDB ObjectId in previous chapters. In this chapter, we will understand the structure of ObjectId.

25 May 2019

Replica Set in MongoDB

Replication is the process of synchronizing data from multiple servers. Replication provides redundancy and increased data availability for multiple data copies on many different

25 May 2019

Shard in MongoDB

Sharding is a process of storing data records across multiple devices and it is a method of MongoDB to meet the requirement for increasing data. When the size of the data

25 May 2019

Create Backup in MongoDB

To create a database Backup in MongoDB, you should use the mongodump command. This command will dump all Server data into dump directory. There are many options available from

25 May 2019

MongoDB Deployment

When you are preparing a MongoDB Deployment, you should understand how your application is being supported in Production.

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Relationship in MongoDB

Relationship in MongoDB represents how the Documents are related. Relationship can be modeled through the Embeded and Referenced method.

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Reference Database in MongoDB

As shown in the Relationship chapter in MongoDB, to deploy a standardized database structure in MongoDB, we use the Referenced Relationship concept, also known as Manual

25 May 2019

Covered Query in MongoDB

When all fields in the query are part of the index, MongoDB connects query conditions and returns the result by using the same index without looking inside the Document. When

25 May 2019

Query analysis in MongoDB

Analyzing queries is a very important aspect to assess the effectiveness of Database and the effectiveness of the designed index. We will explore the two most frequently used

25 May 2019

Atomic Operation in MongoDB

MongoDB does not support Atomic Transaction over multiple Documents. However, it provides Atomic Operations on a single Document. Therefore, if a Document has hundreds of fields,

25 May 2019

Advanced index operation in MongoDB

Create an index on the array ie create separate indexes for each of its fields. So in this situation, when we create an index on the array of tags, individual indexes will be

25 May 2019

Limitations of indexes in MongoDB

Each index not only occupies part of the memory space but also causes an overhead on each insert, update, and delete operation. So, if you rarely use your Collection for read

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