Question: What Is Presto?
Presto is a distributed SQL query engine. It is an open source software project to develop a database.
Question: What Is Presto Verifier?
Presto verifier is used to test Presto against another database (such as MySQL).
Question: What Is The Default Port Of Presto?
The default port of Presto is 8080.
Question: What Are The Functions Of Presto?
There are various functions of Presto that are given below:
Abs(x):It returns the absolute value of X.
Cbrt(x):It returns the cube root of x.
Ceiling(x):It returns the x value rounded up to nearest integer.
Ceil(x):Arial for ceiling(x)
Log2(x):It returns the base 2 logarithm of x.
Question: Why Should We Use Presto?
We should use Presto because of its features:
- It supports standard ANSI SQL.
- It is built in Java.
- It has connector architecture that is Hadoop.
- It runs on multiple Hadoop distributions.
Question: What Is Jmx Connector?
JMX stands for Java Management Extension. It gives information about the java virtual machine and software running inside JVM.
Question: What Is The Use Of Mysql Connector?
MYSQL Connector is used to query an external MySQL database.
Question: What Are The Various Data Types In Presto?
In Presto, there are various data types in Presto.
- Json etc.
Question: How Can We Create Table By Using Command?
We can create table by using command:
presto:tutorials> create table mysql.tutorials.sample as
select * from mysql.tutorials.author;
Question: What Are The Config Properties Of Presto?
The Config properties of Presto are given below table:
task. info -refresh-max-wait:It reduces coordinator work load.
task.max-worker-threads:It splits the process and assigns to each worker nodes.
distributed-joins-enabled:It is Hashed based distributed joins.
node-scheduler.network-topology:It sets network topology to scheduler.
Question: What Are The Components Of Presto Architecture?
Presto architecture components are given below:
- Client : Clint submits SQL statements to a coordinator to get the result.
- Coordinator: It parses the SQL queries.
- Connector : Storage plugin is called as connectors.
- Worker : It assigns task to worker nodes.
Question: What Are The Presto Applications?
There are various Presto applications:
Question: What Are The Log Files Of The Presto Server?
The logs files of the Presto server are given below:
Question: What Are The Features Of Presto?
There are following features of Presto:
- It is simple to use.
- It provides pluggable connectors.
- It provides pipelined executions.
- It provides user define functions.
Apache Presto Questions and Answers for Interview
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