Warning
The behavior of VACUUM is not consistent with PostgreSQL semantics and it is likely going to change in the future.
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Documentation
/ SQL
/ Statements
VACUUM Statement
The VACUUM statement only has basic support in DuckDB and is mostly provided for PostgreSQL-compatibility.
Some variants of it, such as when calling for a given column, recompute the distinct statistics (the amount if distinct entities) if they have become stale due to updates.
Examples
No-op:
VACUUM;
No-op:
VACUUM ANALYZE;
Calling VACUUM on a given table-column pair rebuilds statistics for the table and column:
VACUUM my_table(my_column);
Rebuild statistics for the table and column:
VACUUM ANALYZE my_table(my_column);
The following operation is not supported:
VACUUM FULL;
Not implemented Error:
Full vacuum option
Reclaiming Space
The VACUUM statement does not reclaim space.
For instruction on reclaiming space, refer to the “Reclaiming space” page.