PREWHERE is an optimization applied automatically even if you write WHERE in the query. A separate keyword lets you manually tune this optimizer behavior if you know what you are doing. SELECT column1, column2, column3 […]
We run an OPTIMIZE table_name FINAL after loading, but we still see numerous duplicates even after the OPTIMIZE command appears to have finished. This is because it runs silently and doesn’t return any information or […]
In the previous article, We discussed migrating from Oracle to the ClickHouse database. This migration technology tool will soon be available in the ChistaDATA DBaaS, and you can enjoy the advantages of ClickHouse database with […]
In previous article we talked about migrating from OLTP databases to the ClickHouse database. This migration technology tool will soon be available in the ChistaDATA DBaaS and you can enjoy the advantages of ClickHouse database […]
Introduction ClickHouse is a powerful open source relational database management system that offers high performance, scalability, reliability and data security. As ClickHouse is widely used in various industries, it is important to ensure that it […]
Introduction Each new release includes new features, improvements, and numerous bug fixes, and the ChistaDATA team is always on top of the latest releases. On 26th April 2023, ClickHouse version 22.4 (April 2023) was released, […]
Introduction Top-n queries extract the top or bottom n rows from a result set. In other words, they identify the best or worst examples, such as the top 10 place in a particular area, the […]
Introduction As we mentioned in the previous article in this series, migrating data from OLTP to OLAP is possible. This tutorial shows you how to set up a Postgres Docker image for usage with Debezium […]
Introduction A quick calculation of analytical business data using metrics for modeling, planning, or forecasting is possible with OLAP only. Also a lot of business applications for reporting, simulation models, information-to-knowledge transfers, and trend and […]
ClickHouse has simple bar feature. This enables you to summarize data quickly by creating straightforward charts directly. bar(x, min, max, width) x is the value, min is the 0% and max is the 100% of […]
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