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Increase work_mem and maintenance_work_mem defaults by 4x

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New defaults are 4MB and 64MB.
This commit is contained in:
Bruce Momjian 2014-02-24 13:04:51 -05:00
parent 6f14a6f703
commit 848ae330a4
3 changed files with 6 additions and 6 deletions
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4
doc/src/sgml/config.sgml
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@ -1213,7 +1213,7 @@ include 'filename'
<para> <para>
Specifies the amount of memory to be used by internal sort operations Specifies the amount of memory to be used by internal sort operations
and hash tables before writing to temporary disk files. The value and hash tables before writing to temporary disk files. The value
defaults to one megabyte (<literal>1MB</>). defaults to four megabytes (<literal>4MB</>).
Note that for a complex query, several sort or hash operations might be Note that for a complex query, several sort or hash operations might be
running in parallel; each operation will be allowed to use as much memory running in parallel; each operation will be allowed to use as much memory
as this value specifies before it starts to write data into temporary as this value specifies before it starts to write data into temporary
@ -1239,7 +1239,7 @@ include 'filename'
Specifies the maximum amount of memory to be used by maintenance Specifies the maximum amount of memory to be used by maintenance
operations, such as <command>VACUUM</command>, <command>CREATE operations, such as <command>VACUUM</command>, <command>CREATE
INDEX</>, and <command>ALTER TABLE ADD FOREIGN KEY</>. It defaults INDEX</>, and <command>ALTER TABLE ADD FOREIGN KEY</>. It defaults
to 16 megabytes (<literal>16MB</>). Since only one of these to 64 megabytes (<literal>64MB</>). Since only one of these
operations can be executed at a time by a database session, and operations can be executed at a time by a database session, and
an installation normally doesn't have many of them running an installation normally doesn't have many of them running
concurrently, it's safe to set this value significantly larger concurrently, it's safe to set this value significantly larger

4
src/backend/utils/misc/guc.c
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@ -1773,7 +1773,7 @@ static struct config_int ConfigureNamesInt[] =
GUC_UNIT_KB GUC_UNIT_KB
}, },
&work_mem, &work_mem,
1024, 64, MAX_KILOBYTES, 4096, 64, MAX_KILOBYTES,
NULL, NULL, NULL NULL, NULL, NULL
}, },
@ -1784,7 +1784,7 @@ static struct config_int ConfigureNamesInt[] =
GUC_UNIT_KB GUC_UNIT_KB
}, },
&maintenance_work_mem, &maintenance_work_mem,
16384, 1024, MAX_KILOBYTES, 65536, 1024, MAX_KILOBYTES,
NULL, NULL, NULL NULL, NULL, NULL
}, },

4
src/backend/utils/misc/postgresql.conf.sample
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@ -124,8 +124,8 @@
# per transaction slot, plus lock space (see max_locks_per_transaction). # per transaction slot, plus lock space (see max_locks_per_transaction).
# It is not advisable to set max_prepared_transactions nonzero unless you # It is not advisable to set max_prepared_transactions nonzero unless you
# actively intend to use prepared transactions. # actively intend to use prepared transactions.
#work_mem = 1MB # min 64kB #work_mem = 4MB # min 64kB
#maintenance_work_mem = 16MB # min 1MB #maintenance_work_mem = 64MB # min 1MB
#autovacuum_work_mem = -1 # min 1MB, or -1 to use maintenance_work_mem #autovacuum_work_mem = -1 # min 1MB, or -1 to use maintenance_work_mem
#max_stack_depth = 2MB # min 100kB #max_stack_depth = 2MB # min 100kB
#dynamic_shared_memory_type = posix # the default is the first option #dynamic_shared_memory_type = posix # the default is the first option