Apache Cassandra Installation and Usage

The steps to install and use the Apache Cassandra database are as follows: 1. Download Apache Cassandra: Download the installation package suitable for your operating system from the official website of Apache Cassandra. Download page: http://cassandra.apache.org/download/ 2. Unzip installation package: Unzip the downloaded installation package to the directory of your choice. 3. Configuration file settings: Enter the extracted directory, find the 'cassandra. yaml' file in the 'conf' folder, and open it with a text editor. a. Check ` cluster_ Set the 'name' to ensure that all nodes use the same cluster name. b. Check ` listen_ Address' Settings and necessary network configuration to ensure that Cassandra nodes can communicate with each other. c. Check ` rpc_ Address' setting ensures that clients can remotely access the Cassandra node. d. Configure other options as needed, such as storage path and concurrency settings. 4. Start Cassandra: At the terminal or command prompt, go to the extracted directory and execute the following command to start the Cassandra service: '/ Bin/cassandra '(Linux/MacOS) or' bin cassandra. bat '(Windows). 5. Connect to Cassandra: Open a new terminal or command prompt window, go to the extracted directory, and execute the following command to connect to the Cassandra node: '/ Bin/cqlsh '(Linux/MacOS) or' bin cqlsh. bat '(Windows). 6. Create Keyspaces and Tables: Use CQL (Cassandra Query Language) to create Keyspaces and tables. For example, execute the following command to create a file named 'test'_ Keyspace for keyspace and table named 'users': CREATE KEYSPACE test_keyspace WITH replication = {'class':'SimpleStrategy', 'replication_factor' : 1}; USE test_keyspace; CREATE TABLE users ( id UUID PRIMARY KEY, name TEXT, age INT ); 7. Insert Data: Use the 'Insert' statement to insert data into the table. For example, execute the following command to insert a piece of data into the 'users' table: INSERT INTO users (id, name, age) VALUES (uuid(), 'John Doe', 30); 8. Modify data: Use the 'UPDATE' statement to modify the data in the table. For example, execute the following command to modify the 'name' field to 'Jane Doe' and the 'age' field to 25: UPDATE users SET name = 'Jane Doe', age = 25 WHERE id = some_uuid; 9. Query data: Use the 'SELECT' statement to perform query operations. For example, execute the following command to query all data in the 'users' table: SELECT * FROM users; 10. Delete data: Use the 'DELETE' statement to delete data from the table. For example, execute the following command to delete data under the specified conditions in the 'users' table: DELETE FROM users WHERE id = some_uuid; The above is a brief installation and usage process for using the Apache Cassandra database. You can further configure and operate according to your actual needs.