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GUC: adjust effective_cache_size docs and SQL description 

Clarify that effective_cache_size is both kernel buffers and shared
buffers.

Reported-by: nat@makarevitch.org

Discussion: https://postgr.es/m/153685164808.22334.15432535018443165207@wrigleys.postgresql.org

Backpatch-through: 9.3
This commit is contained in:
Bruce Momjian 2018-11-02 09:11:00 -04:00
parent 0083a82433
commit 3e0f1a4741
2 changed files with 5 additions and 5 deletions
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3
doc/src/sgml/config.sgml
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@ -4147,7 +4147,8 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
used. When setting this parameter you should consider both used. When setting this parameter you should consider both
<productname>PostgreSQL</productname>'s shared buffers and the <productname>PostgreSQL</productname>'s shared buffers and the
portion of the kernel's disk cache that will be used for portion of the kernel's disk cache that will be used for
<productname>PostgreSQL</productname> data files. Also, take <productname>PostgreSQL</productname> data files, though some
data might exist in both places. Also, take
into account the expected number of concurrent queries on different into account the expected number of concurrent queries on different
tables, since they will have to share the available tables, since they will have to share the available
space. This parameter has no effect on the size of shared space. This parameter has no effect on the size of shared

7
src/backend/utils/misc/guc.c
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@ -2987,10 +2987,9 @@ static struct config_int ConfigureNamesInt[] =
{ {
{"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST, {"effective_cache_size", PGC_USERSET, QUERY_TUNING_COST,
gettext_noop("Sets the planner's assumption about the size of the disk cache."), gettext_noop("Sets the planner's assumption about the size of the data cache."),
gettext_noop("That is, the portion of the kernel's disk cache that " gettext_noop("That is, the size of the cache used for PostgreSQL data files. "
"will be used for PostgreSQL data files. This is measured in disk " "This is measured in disk pages, which are normally 8 kB each."),
"pages, which are normally 8 kB each."),
GUC_UNIT_BLOCKS, GUC_UNIT_BLOCKS,
}, },
&effective_cache_size, &effective_cache_size,