As well as the poor selection of a partition key, this issue can manifest itself as a result of many small inserts. Each INSERT into ClickHouse results in an insert block being converted to a part. To keep the number of parts manageable, users should therefore buffer data client-side and insert data as batches - at a minimum 1,000 rows per insert, although batch sizes of 10,000 to 100,000 rows are optimal. If client-side buffering is not possible, users can defer this task to ClickHouse through async inserts. In this case, ClickHouse will buffer inserts in memory before flushing them as a single batched part into the underlying table. The flush is triggered when a configurable threshold is met: a buffer size limit (async_insert_max_data_size, default 1MB), a time threshold (async_insert_busy_timeout_ms, default 1 second), or a maximum number of queued queries (async_insert_max_query_number, default 100). Since data is held in memory until flush, it is important to set wait_for_async_insert=1 (the default) so that the client receives acknowledgement only after data has been safely written to disk, avoiding silent data loss in the event of a server crash before a flush.
Долину уличили в снижении цены на свое выступление втрое20:45
，详情可参考新收录的资料
Costa Alexoglou
Стало известно о возможном ударе по Ирану новой страной14:21
。关于这个话题，新收录的资料提供了深入分析
Faced with these systems, most consumers do one of two things: They rage against the machine, or they resign themselves to impossible conditions. Kessler argued for a third path: Understand the rules of the hidden market you’re in, then play it more intelligently.
В Санкт-Петербурге завершился матч 19-го тура Российской премьер-лиги (РПЛ) между «Зенитом» и «Балтикой». Петербуржцы выиграли со счетом 1:0. Об этом сообщает корреспондент «Ленты.ру».，这一点在新收录的资料中也有详细论述