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slug | sidebar_position | sidebar_label |
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/en/sql-reference/statements/alter/apply-deleted-mask | 46 | APPLY DELETED MASK |
Apply mask of deleted rows
ALTER TABLE [db].name [ON CLUSTER cluster] APPLY DELETED MASK [IN PARTITION partition_id]
The command applies mask created by lightweight delete and forcefully removes rows marked as deleted from disk. This command is a heavyweight mutation, and it semantically equals to query ALTER TABLE [db].name DELETE WHERE _row_exists = 0
.
:::note
It only works for tables in the MergeTree
family (including replicated tables).
:::
See also