May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Debugging your search
Sometimes it is not quite clear why a query matches a given search string. To debug your query, PostgreSQL offers the ts_debug function. From a user's point of view it can be used just like to_tsvector. It reveals a lot about the inner workings of the FTS infrastructure:
test=# \x Expanded display is on. test=# SELECT * FROM ts_debug('english', 'go to www.postgresql-support.de'); -[ RECORD 1 ]+---------------------------- alias | asciiword description | Word, all ASCII token | go dictionaries | {english_stem} dictionary | english_stem lexemes | {go} -[ RECORD 2 ]+---------------------------- alias | blank description | Space symbols token | dictionaries | {} dictionary | lexemes | -[ RECORD 3 ]+---------------------------- ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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