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22 строки
612 B
Plaintext
22 строки
612 B
Plaintext
https://clickhouse.com/docs/en/updating-data
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https://clickhouse.com/docs/en/guides/developer/lightweight-delete#lightweight-delete-internals
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mutations
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https://clickhouse.com/docs/en/sql-reference/statements/alter#mutations
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alter ... update|delete
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set mutations_sync 1
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https://clickhouse.com/docs/en/optimize/skipping-indexes
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! no secondary indices, because data is not stored in rows
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skip inexes (skp_idx_)
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... alter table <> materialize index <> ... to apply newly added index
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2023
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https://clickhouse.com/blog/handling-updates-and-deletes-in-clickhouse
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system db
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\c system
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\d
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query_log
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