Introduction Kafka is the ideal open source platform to implement real-time stream processing in ClickHouse for real-time analytics. At ChistaDATA Inc., we have extensive experience in working with Kafka in the context of ClickHouse for […]
Introduction ClickHouse implements data compression in several ways to reduce storage space and improve query performance. Here are a few examples of how data compression is implemented in ClickHouse: (1) Dictionary encoding ClickHouse uses dictionary […]
Introduction A memory leak in a Kafka producer can occur when the producer is unable to release memory that is no longer needed. This can lead to poor performance and, in extreme cases, cause the […]
Introduction The ClickHouse wire protocol is a binary protocol that is used to communicate between a client and a ClickHouse server. The protocol is implemented in the ClickHouse server and client libraries, and it uses […]
Introduction There are several ways to monitor the performance of a ClickHouse cluster: Using built-in system tables: ClickHouse has several built-in system tables, such as system.metrics, system.metrics_events, and system.query_log, that provide detailed information about the […]
Introduction ClickHouse utilizes multiple data caches to improve query performance. These caches include: Read cache: This cache stores the results of read-only queries. This cache is shared among all clients and is used to avoid […]
Introduction In ClickHouse, memory management is handled by the MemoryTracker class, which is responsible for allocating and deallocating memory to different parts of the system. The MemoryTracker class uses a hierarchical approach to manage memory, […]
Introduction Columnar databases, also known as ColumnStores, are a type of database that stores and organizes data by columns rather than by rows. These types of databases are optimized for analytics and reporting workloads, as […]
Introduction Encrypting data at rest is important because it helps to protect sensitive information in case of a data breach or unauthorized access. When data is at rest, it means that it is stored on […]
Introduction In ClickHouse, a mutation refers to any operation that modifies the data in the database, including insert, update and delete operations. These operations can affect the integrity of the data and the accuracy of […]
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