The CVM Algorithm
(buttondown.com)
Everything you need to know about query planning can be understood from this query:
Everything you need to know about query planning can be understood from this query:
Designing a Query Execution Engine
(trychroma.com)
Distributed Chroma is a multi-tenant system. Query and Compactor nodes serve queries and build indexes for multiple tenants. By leveraging multi-tenancy we can maximize utilization of nodes in our system, resulting in lower costs for our users. However, building with multi-tenancy in mind presents the challenge of how to optimally structure, dispatch, and schedule work such that resources are fairly used across all tenants.
Distributed Chroma is a multi-tenant system. Query and Compactor nodes serve queries and build indexes for multiple tenants. By leveraging multi-tenancy we can maximize utilization of nodes in our system, resulting in lower costs for our users. However, building with multi-tenancy in mind presents the challenge of how to optimally structure, dispatch, and schedule work such that resources are fairly used across all tenants.
Unraveling the Mystery of Idle Threads in ClickHouse
(altinity.com)
ClickHouse is renowned for its lightning-fast analytics and ability to handle large-scale queries. However, like any high-performance database, it can run into challenges under heavy workloads. Imagine running ClickHouse on a well-provisioned machine—ample cores, plenty of memory—only to notice that during peak loads, performance starts to degrade. You check the usual suspects: CPU, disk, network… and everything seems fine. Yet queries seem to “hang,” with even the simplest SELECT 1 taking as long as 10 seconds to execute. What’s going on?
ClickHouse is renowned for its lightning-fast analytics and ability to handle large-scale queries. However, like any high-performance database, it can run into challenges under heavy workloads. Imagine running ClickHouse on a well-provisioned machine—ample cores, plenty of memory—only to notice that during peak loads, performance starts to degrade. You check the usual suspects: CPU, disk, network… and everything seems fine. Yet queries seem to “hang,” with even the simplest SELECT 1 taking as long as 10 seconds to execute. What’s going on?