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Table TTL
https://clickhouse.com/docs/sql-reference/functions/date-time-functions Precise TTL TTL is relat...
Table Engine
The MergeTree engine and other engines of the MergeTree family (e.g. ReplacingMergeTree, Aggregat...
Shard & Replicas
Mutations and Processes
Syatem.mutations Get Recently SELECT * FROM system.mutations WHERE is_done = 0 ORDER BY create_t...
Disk Usage SQL
Disk Info SELECT name, path, formatReadableSize(free_space) AS free, formatRead...
Data Sharding
数据分片定义 数据分片（Sharding） 是一种将大数据集拆分成多个小数据集并存储在不同服务器上的方法，常用于数据库、分布式存储、对象存储等系统，以提高性能、可扩展性和数据管理效率。 简单来...
LowCardinality(T)
Description LowCardinality is an optimized column encoding type in ClickHouse, specifically desi...
Sending Queue Is Full
Error Key error{ "kind": "exporter", "data_type": "logs", "name": "clickhouse", "error":...
OTEL Collector Installaction
Environment Kubernetes Require: 1.24+ Actual: 1.18.3 Opentelemetry Collector Chart: 0.109.0 ...
Database Metrics Doesn't Exist
Errors Key errors{ "kind": "exporter", "data_type": "logs", "name": "clickhouse", "error...