Description
Contains a history of all prefetches done during reading from MergeTree tables backed by a remote filesystem. It is safe to truncate or drop this table at any time.Columns
hostname(LowCardinality(String))clickhouse_version(LowCardinality(String)) — Version of the ClickHouse server that produced the row.system_processor(LowCardinality(String)) — CPU architecture of the ClickHouse server that produced the row.event_date(Date)event_time(DateTime)query_id(String)path(String)offset(UInt64)size(Int64)prefetch_submit_time(DateTime64(6))priority(Int64)prefetch_execution_start_time(DateTime64(6))prefetch_execution_end_time(DateTime64(6))prefetch_execution_time_us(UInt64)state(String)thread_id(UInt64)reader_id(String)