Appendix D. System Tables - D.6 RDB$CONFIG - 《Firebird 4.0 Language Reference》

D.6 RDB$CONFIG

D.6 `RDB$CONFIG`

RDB$CONFIG is a virtual table showing the configuration settings of the current database for the current connection.

Table RDB$CONFIG is populated from in-memory structures upon request and its instance is preserved for the SQL query lifetime. For security reasons, access to this table is allowed for administrators only. Non-privileged users see no rows in this table (and no error is raised).

Column Name	Data Type	Description
`RDB$CONFIG_ID`	`INTEGER`	Unique row identifier, no special meaning
`RDB$CONFIG_NAME`	`VARCHAR(63)`	Setting name (e.g. `TempCacheLimit`)
`RDB$CONFIG_VALUE`	`VARCHAR(255)`	Actual value of setting
`RDB$CONFIG_DEFAULT`	`VARCHAR(255)`	Default value of setting (defined in the Firebird code)
`RDB$CONFIG_IS_SET`	`BOOLEAN`	TRUE if value is explicitly configured, FALSE when default
`RDB$CONFIG_SOURCE`	`VARCHAR(255)`	Name of the configuration file (relative to the Firebird root directory) where this setting was taken from, or special value `DPB` if the setting was specified by the client application via API.