Thursday, 23 January 2020

Cassandra: Get information of specific table

‘DESCRIBE TABLE tableName’ or ‘DESC TABLE tableName’ gives you the information about a table.
cqlsh> DESCRIBE KEYSPACES;

system_schema  system             system_distributed
system_auth    cassandratutorial  system_traces     

cqlsh> 
cqlsh> USE system;
cqlsh:system> 
cqlsh:system> DESC TABLES;

available_ranges          peers               batchlog        transferred_ranges
batches                   compaction_history  size_estimates  hints             
prepared_statements       sstable_activity    built_views   
"IndexInfo"               peer_events         range_xfers   
views_builds_in_progress  paxos               local         

cqlsh:system> 
cqlsh:system> DESC TABLE peers;

CREATE TABLE system.peers (
    peer inet PRIMARY KEY,
    data_center text,
    host_id uuid,
    preferred_ip inet,
    rack text,
    release_version text,
    rpc_address inet,
    schema_version uuid,
    tokens set<text>
) WITH bloom_filter_fp_chance = 0.01
    AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
    AND comment = 'information about known peers in the cluster'
    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 = 0.0
    AND default_time_to_live = 0
    AND gc_grace_seconds = 0
    AND max_index_interval = 2048
    AND memtable_flush_period_in_ms = 3600000
    AND min_index_interval = 128
    AND read_repair_chance = 0.0
    AND speculative_retry = '99PERCENTILE';



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