Skip to main content
These settings configure the ClickHouse server and are autogenerated from ClickHouse source.

​
merges_mutations_memory_usage_soft_limit

Sets the limit on how much RAM is allowed to use for performing merge and mutation operations. If ClickHouse reaches the limit set, it won’t schedule any new background merge or mutation operations but will continue to execute already scheduled tasks.
A value of 0 means unlimited.
Example

​
merges_mutations_memory_usage_to_ram_ratio

The default merges_mutations_memory_usage_soft_limit value is calculated as memory_amount * merges_mutations_memory_usage_to_ram_ratio. See also:
Last modified on July 24, 2026