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Reduce the default value of autovacuum_vacuum_cost_delay to 2ms.

2019年3月10日 19:16:21 +0000 (15:16 -0400)

This is a better way to implement the desired change of increasing
autovacuum's default resource consumption.

Discussion: https://postgr.es/m/28720.1552101086@sss.pgh.pa.us

doc/src/sgml/config.sgml patch | blob | blame | history

src/backend/utils/misc/guc.c patch | blob | blame | history

src/backend/utils/misc/postgresql.conf.sample patch | blob | blame | history

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml

index 00664cd83ee43994c0d41a818c00027476d54696..fe1735722a6f4b0b0fec99d658c96f4c99a36ef5 100644 (file)

--- a/doc/src/sgml/config.sgml

+++ b/doc/src/sgml/config.sgml

@@ -7033,7 +7033,7 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;

Specifies the cost delay value that will be used in automatic

<command>VACUUM</command> operations. If -1 is specified, the regular

<xref linkend="guc-vacuum-cost-delay"/> value will be used.

- The default value is 20 milliseconds.

+ The default value is 2 milliseconds.

This parameter can only be set in the <filename>postgresql.conf</filename>

file or on the server command line;

but the setting can be overridden for individual tables by

diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c

index c82804b1b95dceeabdfb4bc66f43e90b6ba568d8..fe6c6f8a05a51fc3db423d99663d3d35256b63d3 100644 (file)

--- a/src/backend/utils/misc/guc.c

+++ b/src/backend/utils/misc/guc.c

@@ -3312,7 +3312,7 @@ static struct config_real ConfigureNamesReal[] =

GUC_UNIT_MS

&autovacuum_vac_cost_delay,

- 20, -1, 100,

+ 2, -1, 100,

NULL, NULL, NULL

diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample

index 6f97a9ae281db8cedaae10cd4beab3d97adc4fae..cccb5f145a24fe0dbadda5de693debdfecb35c42 100644 (file)

--- a/src/backend/utils/misc/postgresql.conf.sample

+++ b/src/backend/utils/misc/postgresql.conf.sample

@@ -589,7 +589,7 @@

#autovacuum_multixact_freeze_max_age = 400000000 # maximum multixact age

# before forced vacuum

# (change requires restart)

-#autovacuum_vacuum_cost_delay = 20ms # default vacuum cost delay for

+#autovacuum_vacuum_cost_delay = 2ms # default vacuum cost delay for

# autovacuum, in milliseconds;

# -1 means use vacuum_cost_delay

#autovacuum_vacuum_cost_limit = -1 # default vacuum cost limit for

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