About system keyspace tables

The system keyspace includes a number of tables that contain details about your database objects and cluster configuration.

Table 1. Columns in system tables

Table name	Column name	Comment
available_ranges	keyspace_name, ranges
batches	id, mutations, version
batchlog	id, data, version, written_at
built_views	keyspace_name, view_name	Information on materialized views
compaction_history	id, bytes_in, bytes_out, columnfamily_name, compacted_at, keyspace_name, rows_merged	Information on compaction history
"IndexInfo"	table_name, index_name	Information on indexes
local	key, bootstrapped, broadcast_address, cluster_name, cql_version, data_center, gossip_generation, host_id, listen_address, native_protocol_version, partitioner, rack, release_version, rpc_address, schema_version, thrift_version, tokens, truncated_at map	Information on a node has about itself and a superset of gossip.
paxos	row_key, cf_id, in_progress_ballot, most_recent_commit, most_recent_commit_at, most_recent_commit_version, proposal, proposal_ballot, proposal_version	Information on lightweight Paxos transactions
peers	peer, data_center, host_id, preferred_ip, rack, release_version, rpc_address, schema_version, tokens	Each node records what other nodes tell it about themselves over the gossip.
peer_events	peer, hints_dropped
prepared_statements	prepared_id, logged_keyspace, query_string	Prepared statements used by drivers for queries.
range_xfers	token_bytes,requested_at
size_estimates	keyspace_name, table_name, range_start, range_end, mean_partition_size, partitions_count	Information on partitions
sstable_activity	keyspace_name, columnfamily_name, generation, rate_120m, rate_15m
views_builds_in_progress	keyspace_name, view_name, generation_number, last_token

Table 2. Columns in system_schema tables

Table name	Column name	Comment
aggregates	keyspace_name, aggregate_name, argument_types, final_func, initcond, return_type, state_func, state_type	Information about user-defined aggregates
columns	keyspace_name, table_name, column_name, clustering_order, column_name_bytes, kind, position, type	Information about table columns
dropped_columns	keyspace_name, table_name, column_name, dropped_time, type	Information about dropped columns
functions	keyspace_name, function_name, argument_types, argument_names, body, called_on_null_input, language, return_type	Information on user-defined functions
indexes	keyspace_name, table_name, index_name, kind,options	Information about indexes
keyspaces	keyspace_name, durable_writes, replication	Information on keyspace durable writes and replication
tables	keyspace_name, table_name, bloom_filter_fp_chance, caching, comment, compaction, compression, crc_check_chance, dclocal_read_repair_chance, default_time_to_live, extensions, flags, gc_grace_seconds, id, max_index_interval, memtable_flush_period_in_ms, min_index_interval, read_repair_chance, speculative_retry	Information on columns and column indexes. Used internally for compound primary keys.
triggers	keyspace_name, table_name, trigger_name, options	Information on triggers
types	keyspace_name, type_name, field_names, field_types	Information about user-defined types
views	keyspace_name, view_name, base_table_id, base_table_name, bloom_filter_fp_chance, caching, comment, compaction, compression, crc_check_chance, dclocal_read_repair_chance, default_time_to_live, extensions, flags,gc_grace_seconds, include_all_columns, max_index_interval, memtable_flush_period_in_ms, min_index_interval, read_repair_chance, speculative_retry, where_clause	Information about materialized views

Table 3. Columns in system_distributed tables

Table name	Column names	Comment
repair_history	keyspace_name, columnfamily_name, id, coordinator, exception_message, exception_stacktrace, finished_at, parent_id, participants, range_begin, range_end, started_at, status	Contains detailed information on keyspace repair history.