Please Help Me!!!!!!!!!!!!!

Na2CO3 → Na2O + what

Katarina [22]

Answer:

CO3

Explanation:

6 0

2 years ago

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Which is the most likely reason why scientists change a model?

frozen [14]

C.) New discoveries make the current model inaccurate. Since science is all about observation and experimentation, it is logical that whenever new findings are gathered, scientific models must be modified to adapt to the information. As new ideas and concepts are uncovered, models should be updated to make them correct.

5 0

3 years ago

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List any 5 Unix commands with their brief description?

AlexFokin [52]

Answer:

Commands: commands are also known as "programs" and the program is a set of rules that performs a specific task which is executed by a computer.

Unix is an operating system. that supports multi-tasking and multi-user functionality. Unix is most widely used in all forms of computing systems such as desktop, laptop, and servers. It provides a Graphical user interface similar to windows.

The Unix operating system there are various commands. The list of five Unix commands can be given as:

1) cal

2) date

3) banner

4) who

5) whoami

1)cal:

The cal command stands for calender. It displays the date.

Syntax:

$ cal

or

$ cal [[month] year]

Example:

$ cal 10 2019

2)date:

The date command stands for date and time. It displays the system date and time.

Syntax:

$date

or

$ date[+format]

Example:

$ date +%d/%m/%y

3) banner

The banner command stands for display the text in to a large size.

Syntax:

$banner message

Example:

$banner Unix

4) who

The who command stands for display the list of users currently logged in.

Syntax:

$who

or

$who [option] … [file][arg1]

Example:

$who

5) whoami

The whoami command stands for display the user id of the currently logged-in user.

Syntax:

$whoami

Example:

$whoami

Explanation:

1)cal command display the current month and year.

2)date command display system date and time.

3)banner command display text in large size.

4)who command display the user name who currently login.

5)whoami command display user id.

4 0

3 years ago

Which type of footwear should be worn while working on a hybrid vehicle?

Dmitrij [34]

Hello there!

Shoes with rubber souls would be the best bet.

7 0

3 years ago

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Research 3 distributions that utilize the big data file systems approaches, and summarize the characteristics and provided funct

OlgaM077 [116]

Answer:

Explanation:

1: The three most popular data systems that make use of Big Data file systems approach are:

The HDFS (Hadoop Distributed File System), Apache Spark, and Quantcast File System(QFS).

HDFS is the most popular among these and it makes use of the MapReduce algorithm to perform the data management tasks. It can highly tolerate faults and can run on low-cost hardware. It was written in Java and it is an open-source software.

Apache Spark makes use of Resilient Distributed Data (RDD) protocol. It is much faster and lighter than the HDFS and it can be programmed using a variety of languages such as Java, Scala, Python, etc. Its main advantage over HDFS is that it is highly scalable.

While QFS was developed as an alternative to the HDFS and it is also highly fault-tolerant and with space efficient. It makes use of the Reed-Solomon Error Correction technique to perform the task of data management.

2: The NewSQL databases were developed as a solution to the scalability challenges of the monolithic SQL databases. They were designed to allow multiple nodes in the context of an SQL database without affecting the replication architecture. It worked really well during the starting years of the cloud technology. Some of the databases that make use of New SQL technology are Vitess, Citus, etc.

Vitess was developed as an automatic sharding solution to the MySQL. Every MySQL instance acts as a shard of the overall database and each of these instances uses standard MySQL master-slave replication to ensure higher availability.

While, Citus is a PostgreSQL equivalent of the Vitess. It ensures transparent sharding due to which it accounts for horizontal write scalability to PostgreSQL deployments.

NoSQL database technology was developed to provide a mechanism for the storage and retrieval of data that is modeled in a way other than the tabular relations used in the traditional databases (RDBMS). The most popular database that makes use of the NoSQL technology is MongoDB. It functions as a cross-platform document-oriented database. It is known for its ability to provide high availability of replica sets. A replica set is nothing but a bundle of two or more copies of the data

3 0

3 years ago