PostgreSQL : Documentation: 9.5: ALTER TEXT SEARCH DICTIONARY : Postgres Professional

ALTER TEXT SEARCH DICTIONARY
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ALTER TEXT SEARCH DICTIONARY

ALTER TEXT SEARCH DICTIONARY — change the definition of a text search dictionary

Synopsis

ALTER TEXT SEARCH DICTIONARY name (
    option [ = value ] [, ... ]
)
ALTER TEXT SEARCH DICTIONARY name RENAME TO new_name
ALTER TEXT SEARCH DICTIONARY name OWNER TO { new_owner | CURRENT_USER | SESSION_USER }
ALTER TEXT SEARCH DICTIONARY name SET SCHEMA new_schema

Description

ALTER TEXT SEARCH DICTIONARY changes the definition of a text search dictionary. You can change the dictionary's template-specific options, or change the dictionary's name or owner.

You must be the owner of the dictionary to use ALTER TEXT SEARCH DICTIONARY.

Parameters

name: The name (optionally schema-qualified) of an existing text search dictionary.
option: The name of a template-specific option to be set for this dictionary.
value: The new value to use for a template-specific option. If the equal sign and value are omitted, then any previous setting for the option is removed from the dictionary, allowing the default to be used.
new_name: The new name of the text search dictionary.
new_owner: The new owner of the text search dictionary.
new_schema: The new schema for the text search dictionary.

Template-specific options can appear in any order.

Examples

The following example command changes the stopword list for a Snowball-based dictionary. Other parameters remain unchanged.

ALTER TEXT SEARCH DICTIONARY my_dict ( StopWords = newrussian );

The following example command changes the language option to dutch, and removes the stopword option entirely.

ALTER TEXT SEARCH DICTIONARY my_dict ( language = dutch, StopWords );

The following example command “updates” the dictionary's definition without actually changing anything.

ALTER TEXT SEARCH DICTIONARY my_dict ( dummy );

(The reason this works is that the option removal code doesn't complain if there is no such option.) This trick is useful when changing configuration files for the dictionary: the ALTER will force existing database sessions to re-read the configuration files, which otherwise they would never do if they had read them earlier.

Compatibility

There is no ALTER TEXT SEARCH DICTIONARY statement in the SQL standard.

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