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| author | David Rowley <drowley@postgresql.org> | 2022-10-21 09:29:56 +1300 |
|---|---|---|
| committer | David Rowley <drowley@postgresql.org> | 2022-10-21 09:29:56 +1300 |
| commit | 536a3b87037b7eac1e9e2780738a0056d89634f6 (patch) | |
| tree | d9b88e98de8f40ea09d50ea7a07ef90adb9932f4 /doc/src | |
| parent | 64ff0fe4e8c47fc390bb645d48ba38675494a2b4 (diff) | |
Doc: fix outdated wording about parallel seq scans
56788d215 adjusted the parallel seq scan code so that instead of handing
out a single block at a time to parallel workers, it now hands out ranges
of blocks.
Here we update the documentation which still claimed that workers received
just 1 block at a time.
Reported-by: Zhang Mingli
Discussion: https://postgr.es/m/17c99615-2c3b-4e4e-9d0b-424a66a7bccd@Spark
Backpatch-through: 14, where 56788d215 was added.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/parallel.sgml | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/src/sgml/parallel.sgml b/doc/src/sgml/parallel.sgml index c37fb67065c..e556786e2bd 100644 --- a/doc/src/sgml/parallel.sgml +++ b/doc/src/sgml/parallel.sgml @@ -272,8 +272,9 @@ EXPLAIN SELECT * FROM pgbench_accounts WHERE filler LIKE '%x%'; <listitem> <para> In a <emphasis>parallel sequential scan</emphasis>, the table's blocks will - be divided among the cooperating processes. Blocks are handed out one - at a time, so that access to the table remains sequential. + be divided into ranges and shared among the cooperating processes. Each + worker process will complete the scanning of its given range of blocks before + requesting an additional range of blocks. </para> </listitem> <listitem> |