CQL: default_time_to_live: Setting default expiration time to the data at table creation time

'default_time_to_live' is used to set the default expiration time (“TTL”) in seconds for a table.

Example

CREATE TABLE IF NOT EXISTS cassandratutorial.employee (

  id INT PRIMARY KEY,

  firstName VARCHAR,

  lastName VARCHAR,

  age int,

) WITH default_time_to_live=3600;

cqlsh> CREATE TABLE IF NOT EXISTS cassandratutorial.employee (
   ...   id INT PRIMARY KEY, 
   ...   firstName VARCHAR,
   ...   lastName VARCHAR,
   ...   age int,
   ... ) WITH default_time_to_live=3600;
cqlsh> 
cqlsh> DESCRIBE cassandratutorial.employee;

CREATE TABLE cassandratutorial.employee (
    id int PRIMARY KEY,
    age int,
    firstname text,
    lastname text
) WITH bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = ''
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 3600
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';

cqlsh>

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Cassandra: USE KEYSPACE: Use specific key space

‘USE KEYSPACE’ command is used to tell the CASSANDRA, use this keyspace for the current user session.

Syntax

USE KEYSPACE

Example

USE cassandratutorial;

Step 1: Create a keyspace ‘cassandratutorial’.

CREATE keyspace cassandratutorial WITH REPLICATION = 
{ 
 'class' : 'SimpleStrategy', 
 'replication_factor' : 1 
};

Step 2: Notify Cassandra, that you would like to use the keyspace ‘cassandratutorial’ for this session.

cqlsh> USE cassandratutorial;
cqlsh:cassandratutorial>

Step 3: Create a table employee.

CREATE TABLE IF NOT EXISTS employee (

  id INT,

  firstName VARCHAR,

  PRIMARY KEY((id, firstName))

) WITH comment = 'Table to store Employee information';

cqlsh> CREATE keyspace cassandratutorial WITH REPLICATION = 
   ... { 
   ... 'class' : 'SimpleStrategy', 
   ... 'replication_factor' : 1 
   ... };
cqlsh> 
cqlsh> USE cassandratutorial;
cqlsh:cassandratutorial> 
cqlsh:cassandratutorial> CREATE TABLE IF NOT EXISTS employee (
                     ...   id INT, 
                     ...   firstName VARCHAR,
                     ...   PRIMARY KEY((id, firstName))
                     ... ) WITH comment = 'Table to store Employee information';
cqlsh:cassandratutorial> 
cqlsh:cassandratutorial> DESCRIBE employee;

CREATE TABLE cassandratutorial.employee (
    id int,
    firstname text,
    PRIMARY KEY ((id, firstname))
) WITH bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = 'Table to store Employee information'
    AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', 'max_threshold': '32', 'min_threshold': '4'}
    AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
    AND crc_check_chance = 1.0
    AND dclocal_read_repair_chance = 0.1
    AND default_time_to_live = 0
    AND gc_grace_seconds = 864000
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 0
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';

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