ClickHouse offers an experimental JSON format. So we need to SET allow_experimental_object_type = 1 Now, we may use the JSON type and insert JSON values while creating tables. CREATE TABLE exp_test ( `id` UInt64, `value` […]
Introduction Among DBAs, there is much debate regarding the significance of database performance tuning. As we now understand, various data types really power the business world. It should be operating very effectively and always be […]
Depending on the size of the SELECT or INSERT operation, we can see an error if memory usage is high. Code: 241. DB::Exception: Received from localhost:9000. DB::Exception: Memory limit (for query) exceeded Is there a […]
In our previous KB, we mentioned the functions. You can view the tables and data from earlier KBs. We’ll attempt to go through count functions today and compare them. 10.000.000 records were used in this […]
With the help of ClickHouse functions, you can rapidly determine how many duplicate rows are present in a table and then eliminate them, leaving just the unique rows. Let’s create a table: CREATE TABLE default.exp_test […]
Assume we have two tables with identical amounts of data, each with roughly n million rows for each. If we want to compare the data row by row, we can utilize with sipHash64(*) hash function. […]
Introduction Among DBAs, there is much debate regarding the significance of database performance tuning. As we now understand, various types of data are what really power the business world. It should be operating very effectively […]
Introduction Among DBAs, there is much debate regarding the significance of database performance tuning. As we now understand, various types of data are what really power the business world. It should be operating very effectively […]
Introduction Every new release includes new features, enhancements, and numerous bug fixes, and the ChistaDATA team always stays on top of the latest releases. On October 25, 2022, ClickHouse version 22.10 (October 2022) was released, […]
Introduction “I am aware that people are disappointed with the performance. But all of our measurements are in the green, so the problem must be somewhere else.” Wouldn’t it be nice to be able to […]
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