What are pipes in UNIX?
A pipe is a form of redirection that is used in Linux and other Unix-like operating systems to send the output of one program to another program for further processing.
What is link in UNIX?
A link in UNIX is a pointer to a file. Like pointers in any programming languages, links in UNIX are pointers pointing to a file or a directory. Creating links is a kind of shortcuts to access a file.
What is ls R in Unix?
ls -r option flag lists files/directories in reverse order. ls -R option flag lists directory tree recursively.
Who wc output?
who | wc -l in this command, the output of who command was fed as input to the second wc -l command. Thus inturn, wc -l calculates the number of lines present in the standard input(2) and displays(stdout) the final result. To see the number of users who are logged in, run who command with -q parameter as below.
What does ETL stand for in an interview?
ETL stands for extract, transform, and load. These are the three functions of databases that are combined into a single tool such that you can take out data from a particular database and store or keep it in another. This ETL Interview Questions blog has a compiled list of questions that are most generally asked during interviews.
What are the roles of the ETL team?
The roles of the ETL team at the highest level are to build the back room of the data warehouse. Deliver data most effectively to end-user tools Add value to data in the cleaning and conforming steps Protect and document the lineage of data Extracting data from the original sources
How does the initial load work in ETL?
In ETL, the initial load is the process for populating all data warehousing tables for the very first time. In full load, when the data is loaded for the first time, all set records are loaded at a stretch depending on its volume. It would erase all contents from the table and would reload the fresh data.
How is ETL used in the real world?
A properly designed ETL system extracts data from the source systems, enforces data quality and consistency standards, confirms data so that separate sources can be used together, and finally delivers data in a presentation-ready format so that application developers can build applications and end users can make decisions. 2.