How do I start MySQL on Linux?

Start MySQL Server on Linux
  1. sudo service mysql start.
  2. sudo /etc/init.d/mysql start.
  3. sudo systemctl start mysqld.
  4. mysqld.

How can I create a database?

Create a blank database
  1. On the File tab, click New, and then click Blank Database.
  2. Type a file name in the File Name box.
  3. Click Create.
  4. Begin typing to add data, or you can paste data from another source, as described in the section Copy data from another source into an Access table.

How do I create a new database in MySQL?

Create a MySQL Database Using CLI
  1. SSH into your server.
  2. Log into MySQL as the root user.
  3. Create a new database user: GRANT ALL PRIVILEGES ON *.
  4. Log out of MySQL by typing: \q .
  5. Log in as the new database user you just created: mysql -u db_user -p.
  6. Create a new database:

How do I create a local database?

Creating Local Database Using Microsoft SQL Server
  1. Go to Start and search for Microsoft SQL Server.
  2. To create a local database, you need a Server first.
  3. Now, you are connected to the Server, so can you create a database.
  4. You will see a window when clicked on the new database option.
  5. Now, you can see a new database appearing in the database menu in the Object Explorer.

How do you create a database table?

Create a new table in an existing database
  1. Click File > Open, and click the database if it is listed under Recent. If not, select one of the browse options to locate the database.
  2. In the Open dialog box, select the database that you want to open, and then click Open.
  3. On the Create tab, in the Tables group, click Table.

How do you show database?

Show MySQL Databases

The most common way to get a list of the MySQL databases is by using the mysql client to connect to the MySQL server and run the SHOW DATABASES command. If you haven’t set a password for your MySQL user you can omit the -p switch.

How do I create a hive database?

Go to Hive shell by giving the command sudo hive and enter the command ‘create database<data base name>’ to create the new database in the Hive. To list out the databases in Hive warehouse, enter the command ‘show databases‘. The database creates in a default location of the Hive warehouse.

How do I find my current Hive database?

current. db=true will show the current DB for current hive session only, but if we update the . hiverc file with the above property will keep showing the current db for all the sessions.

How do I find the size of my hive database?

Finding Total Size of Hive Database’s data
  1. Login into Hive Metastore DB and use the database that is used by hive. hive1 by default.
  2. Once done, you can execute the below query to get the total size of all the tables in Hive in bytes.
  3. Remember, the result derived above is for only one replication.

How do I determine the size of a table in HDFS?

It would seem that if you include the partition it will give you a raw data size. Otherwise, hdfs dfs -du -s -h /path/to/table will do.

How do you check Hive table size in GB?

jobssss reblogged this from jobssss and added: deprecate $ hadoop fs -du /hive/username. db/ | awk ‘/^[0-9]+/ { print int($1/(1024**3)) “ [GB]\t” $2 }’ USE $ hadoop fs

How can I check the size of my Hadoop database?

Use hdfs dfs -du Command

Hadoop supports many useful commands that you can use in day to day activities such as finding size of hdfs folder. Hive stores data in the table as hdfs file, you can simply use hdfs dfs -du command to identify size of folder and that would be your table size.

How do I check my memory on HDFS?

Checking HDFS Disk Usage
  1. Use the df command to check free space in HDFS.
  2. Use the du command to check space usage.
  3. Use the dfsadmin command to check free and used space.

What is rawDataSize in hive?

rawDataSize is the size of original data set, totalSize is amount of storage it takes. It is applicable for ORC file format, as it compresses the data totalSize will be lesser than rawDataSize.

How do I find my HDFS directory?

If you type hdfs dfs -ls / you will get list of directories in hdfs. Then you can transfer files from local file system to hdfs using -copyFromLocal or -put to a particular directory or using -mkdir you can create new directory.

How do I view an HDFS file?

The hadoop fs -ls command allows you to view the files and directories in your HDFS filesystem, much as the ls command works on Linux / OS X / *nix. A user’s home directory in HDFS is located at /user/userName.

How do 2 reducers communicate with each other?

Every task instance has its own JVM process. For every new task instance, a JVM process is spawned by default for a task. 17) Can reducers communicate with each other? Reducers always run in isolation and they can never communicate with each other as per the Hadoop MapReduce programming paradigm.

What is Hdfs in Linux?

The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware. It has many similarities with existing distributed file systems.

How do I list an HDFS file?

Use the hdfs dfs -ls command to list files in Hadoop archives. Run the hdfs dfs -ls command by specifying the archive directory location. Note that the modified parent argument causes the files to be archived relative to /user/ .