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We recommend having a maximum of 1000 databases and 5000 tables, 50000 partitions, and 100000 parts across all databases for a service. Databases in ClickHouse are more of a namespace and have no performance impact; 1000 databases is a loose guideline. However, the number of tables would affect the service startup time, so we recommend limiting the number of tables or partitions. ClickHouse provides a warning if these thresholds are hit. These limits are also applicable to ClickHouse Cloud.