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doc: suggest 1.1 as a random_page_cost value for SSDs 

Reported-by: yigong hu

Discussion: https://postgr.es/m/CAOxFffcourucFqSk+tZA13ErS3XRYkDy6EeaPff4AvHGiEEuug@mail.gmail.com

Backpatch-through: 9.5
This commit is contained in:
Bruce Momjian 2020-05-21 20:28:38 -04:00
parent c20fd088f1
commit 1c2ff3ef07
1 changed files with 2 additions and 1 deletions
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doc/src/sgml/config.sgml
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@ -4925,7 +4925,8 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
the database is smaller than the total server memory, decreasing
random_page_cost can be appropriate. Storage that has a low random
read cost relative to sequential, e.g. solid-state drives, might
also be better modeled with a lower value for random_page_cost.
also be better modeled with a lower value for random_page_cost,
e.g., <literal>1.1</literal>.
</para>
<tip>