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4.10.3 Other Defaults

dynamic_library_path (string)

If a dynamically loadable module needs to be opened and the file name specified in the CREATE FUNCTION or LOAD command does not have a directory component (i.e., the name does not contain a slash), the system will search this path for the required file. The value for dynamic_library_path must be a list of absolute directory paths separated by colons (or semi-colons on Windows). If a list element starts with the special string $libdir, the compiled-in PostgreSQL package library directory is substituted for $libdir; this is where the modules provided by the standard PostgreSQL distribution are installed. (Use pg_config --pkglibdir to find out the name of this directory.) For example:

dynamic_library_path = '/usr/local/lib/postgresql:/home/
  my_project/lib:$libdir'

or, in a Windows environment:

dynamic_library_path = 'C:\tools\postgresql;
  H:\my_project\lib;$libdir'

The default value for this parameter is '$libdir'. If the value is set to an empty string, the automatic path search is turned off. This parameter can be changed at run time by superusers, but a setting done that way will only persist until the end of the client connection, so this method should be reserved for development purposes. The recommended way to set this parameter is in the ‘postgresql.conf’ configuration file.

gin_fuzzy_search_limit (integer)

Soft upper limit of the size of the set returned by GIN index scans. For more information see GIN tips and tricks.

local_preload_libraries (string)

This variable specifies one or more shared libraries that are to be preloaded at connection start. If more than one library is to be loaded, separate their names with commas. All library names are converted to lower case unless double-quoted. This parameter cannot be changed after the start of a particular session. Because this is not a superuser-only option, the libraries that can be loaded are restricted to those appearing in the ‘plugins’ subdirectory of the installation's standard library directory. (It is the database administrator's responsibility to ensure that only “safe” libraries are installed there.) Entries in local_preload_libraries can specify this directory explicitly, for example $libdir/plugins/mylib, or just specify the library name---mylib would have the same effect as $libdir/plugins/mylib. Unlike local_preload_libraries, there is no performance advantage to loading a library at session start rather than when it is first used. Rather, the intent of this feature is to allow debugging or performance-measurement libraries to be loaded into specific sessions without an explicit LOAD command being given. For example, debugging could be enabled for all sessions under a given user name by setting this parameter with ALTER USER SET. If a specified library is not found, the connection attempt will fail. Every PostgreSQL-supported library has a “magic block” that is checked to guarantee compatibility. For this reason, non-PostgreSQL libraries cannot be loaded in this way.