Multi-block buffered reads in PostgreSQL 19 (IO combine & prefetch)
PostgreSQL scans operate at the page level: the buffer manager fetches one 8 KB page (BLCKSZ) at a time, issuing one read per block. The operating system may merge some of these requests through readahead, but PostgreSQL still generates many small I/O operations, leading to a high number of system c
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AiFeed24 Team·⏱ 1 min read·News
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