Documentazione di PostgreSQL 9.0 > Internal > System Catalogs > pg_settings
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45.55. pg_settings

The view pg_settings provides access to run-time parameters of the server. It is essentially an alternative interface to the SHOW(7) and SET(7) commands. It also provides access to some facts about each parameter that are not directly available from SHOW, such as minimum and maximum values.

Tabella 45.56. pg_settings Columns

NameTypeDescription
nametextRun-time configuration parameter name
settingtextCurrent value of the parameter
unittextImplicit unit of the parameter
categorytextLogical group of the parameter
short_desctextA brief description of the parameter
extra_desctextAdditional, more detailed, description of the parameter
contexttextContext required to set the parameter's value
vartypetextParameter type (bool, enum, integer, real, or string)
sourcetextSource of the current parameter value
min_valtextMinimum allowed value of the parameter (null for non-numeric values)
max_valtextMaximum allowed value of the parameter (null for non-numeric values)
enumvalstext[]Allowed values of an enum parameter (null for non-enum values)
boot_valtextParameter value assumed at server startup if the parameter is not otherwise set
reset_valtextValue that RESET would reset the parameter to in the current session
sourcefiletextConfiguration file the current value was set in (null for values set from sources other than configuration files, or when examined by a non-superuser); helpful when using include directives in configuration files
sourcelineintegerLine number within the configuration file the current value was set at (null for values set from sources other than configuration files, or when examined by a non-superuser)

The pg_settings view cannot be inserted into or deleted from, but it can be updated. An UPDATE applied to a row of pg_settings is equivalent to executing the SET(7) command on that named parameter. The change only affects the value used by the current session. If an UPDATE is issued within a transaction that is later aborted, the effects of the UPDATE command disappear when the transaction is rolled back. Once the surrounding transaction is committed, the effects will persist until the end of the session, unless overridden by another UPDATE or SET.

Documentazione di PostgreSQL 9.0 > Internal > System Catalogs > pg_settings
Precedentepg_rulespg_shadowSuccessivo