Analytical database

ClickHouse

Open-source columnar database for real-time analytics.

A column-oriented OLAP engine known for very fast aggregations over billions of rows, built on MergeTree table engines, sparse primary indexes, vectorized execution and aggressive compression.

Data model: Analytical
Vendor: ClickHouse Inc.
License: Apache 2.0 (open source)
Articles: 1

ClickHouseIntermediate

How do I fix ClickHouse "Too many parts"?

TOO_MANY_PARTS means too many small inserts, not too much data. Batch your writes, turn on async inserts, and stop over-partitioning your MergeTree tables.

#configuration#performance#troubleshooting

Tanishk · 7 min

Oct 19, 2026