ClickHouse Tips

Overview of Vectorized Query Processing in ClickHouse
ChistaDATA

Troubleshooting Disk Space in ClickHouse

ChistaDATA Inc.
Troubleshooting Disk Space Issues: Managing ClickHouse Log Tables ClickHouse is a high-performance, columnar database management system optimized for real-time analytical workloads. While its speed and scalability make it ideal for large-scale data processing, one common […]
ClickHouse Search: Case-sensitive Searches with UPPER & LOWER Functions
ChistaDATA

Boosting Materialized View Performance

ChistaDATA Inc.
Aggregation States: Boosting Materialized View Performance by 10x in ClickHouse ClickHouse has long been celebrated for its lightning-fast analytical query performance, especially when handling massive datasets in real time. One of the most powerful features […]
Tuning index_granularity for ClickHouse Performance
ChistaDATA

Understanding ClickHouse Wait Events

ChistaDATA Inc.
Understanding ClickHouse Wait Events: A Comprehensive Troubleshooting Guide Introduction Wait events in ClickHouse reveal where query execution slows down—whether from disk bottlenecks, lock contention, CPU saturation, or network latency. Mastering these signals empowers you to […]
Using EXPLAIN to Determine JOIN Order in ClickHouse Query Execution Plan
ChistaDATA

Reduce Query Memory Usage in ClickHouse

ChistaDATA Inc.
How to Reduce Query Memory Usage in ClickHouse: Troubleshooting Memory Limit Exceeded Errors Memory limit exceeded errors are among the most common challenges ClickHouse users face when running complex analytical queries. Whether you’re performing large […]
How Regular Expressions Are Implemented in ClickHouse
ChistaDATA

ClickHouse ReplacingMergeTree Explained

ChistaDATA Inc.
ClickHouse ReplacingMergeTree  Introduction ClickHouse ReplacingMergeTree is a powerful table engine designed to handle data deduplication in analytical workloads. While it promises to solve duplicate data challenges, understanding its nuances is crucial for successful implementation. This […]
ClickHouse Query Performance

Troubleshooting Suboptimal ClickHouse Queries

Shiv Iyer
ClickHouse Queries To troubleshoot and optimize slow ClickHouse queries, follow these steps: 1. Use EXPLAIN to Analyze Query Plans EXPLAIN syntax SELECT * FROM table WHERE condition Available syntax options: EXPLAIN PLAN – shows execution […]
ClickHouse Security

Data Security and Data Masking in ClickHouse

Shiv Iyer
Comprehensive Guide to Data Security and Data Masking in ClickHouse: Protecting Your Data While Maintaining Performance In today’s data-driven landscape, organizations face the dual challenge of leveraging their data for insights while ensuring robust protection […]