- Cassandra Tutorial
I'll be getting some free time over the next few weeks and I intend to put together a series of Cassandra Cheat Sheets. I've been wanting to for a while but haven't gotten round to it, so the following list are the individual sheets which target specific things relating to Cassandra. AIOUG Webinar – Oracle New Features (18c,19c,21c(20c) – 10-Feb-2021 – 1.30PM IST; Oracle database 20c or 21c? Database Service Availability Summary – Grafana Dashboard. A programming cheat sheet. Cassandra Command line starting cassandra sh bin/cassandra open CQL command prompt.
- Cassandra Keyspace Operations
- Cassandra Table Operations
- Cassandra CURD Operations
- Cassandra CQL Types
- Cassandra Useful Resources
- Selected Reading
Cassandra provides documented shell commands in addition to CQL commands. Given below are the Cassandra documented shell commands.
The HELP command displays a synopsis and a brief description of all cqlsh commands. Given below is the usage of help command.
This command captures the output of a command and adds it to a file. For example, take a look at the following code that captures the output to a file named Outputfile.
When we type any command in the terminal, the output will be captured by thefile given. Given below is the command used and the snapshot of the output file.
You can turn capturing off using the following command.
This command shows the current consistency level, or sets a new consistency level.
This command copies data to and from Cassandra to a file. Given below is an example to copy the table named emp to the file myfile.
If you open and verify the file given, you can find the copied data as shown below.
This command describes the current cluster of Cassandra and its objects. The variants of this command are explained below.
Describe cluster − This command provides information about the cluster.
Describe Keyspaces − This command lists all the keyspaces in a cluster. Given below is the usage of this command.
Describe tables − This command lists all the tables in a keyspace. Given below is the usage of this command.
Describe table − This command provides the description of a table. Given below is the usage of this command.
This command is used to describe a user-defined data type. Given below is theusage of this command.
This command lists all the user-defined data types. Given below is the usage of this command. Assume there are two user-defined data types: card and card_details.
This command is used to expand the output. Before using this command, you have to turn the expand command on. Given below is the usage of this command.
Note − You can turn the expand option off using the following command.
This command is used to terminate the cql shell.
This command displays the details of current cqlsh session such as Cassandra version, host, or data type assumptions. Given below is the usage of this command.
Using this command, you can execute the commands in a file. Suppose our input file is as follows −
Then you can execute the file containing the commands as shown below.
Cassandra Commands Cheat Sheet
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Cassandra Cql Commands Cheat Sheet
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