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7 lines
397 B
TeX
7 lines
397 B
TeX
There are some systems that do not use indexes, or very sparingly.
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Instead, they keep metadata about the blocks and store them in memory and use it to check if the data in the block is needed.
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This is common in column-store engines such as DuckDB and Snowflake.
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This metadata can be as simple as min/max for each column,
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or complete stats, bitmaps, precomputed aggregates, or even bloom filters.
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