merge_total_max_bytes_to_prewarm_cache
Only available in ClickHouse Cloud. Maximal size of parts in total to prewarm cache during merge.merge_use_batch_sorting_queue
Use the batch sorting queue to reduce per-row queue overhead when merging sorted streams. Only applies to merges that do not change rows, i.e. plainMergeTree
(Ordinary merge mode). It has no effect on engines with merge-time
semantics such as ReplacingMergeTree, CollapsingMergeTree,
SummingMergeTree, AggregatingMergeTree, CoalescingMergeTree,
GraphiteMergeTree and VersionedCollapsingMergeTree, which keep using the
default queue regardless of this setting.
merge_workload
Used to regulate how resources are utilized and shared between merges and other workloads. Specified value is used asworkload setting value for
background merges of this table. If not specified (empty string), then
server setting merge_workload is used instead.
See Also