I'm trying to anlayze a query in postgresql v9.6.4:
explain (ANALYZE,BUFFERS) SELECT p.* FROM place as p INNER JOIN user as u ON p.id = u.place_id where to_tsvector('simple', p.name) @@ to_tsquery('simple', 'a:*') and
u.status = true;
The QueryPlan was :
Hash Join (cost=20.28..31.72 rows=1 width=1561) (actual
time=0.001..0.001 rows=0 loops=1)' Hash Cond: (u.place_id = p.id)' -> Seq Scan on user u (cost=0.00..11.20 rows=60 width=4) (actual
time=0.001..0.001 rows=0 loops=1)' Filter: status' -> Hash (cost=20.27..20.27 rows=1 width=1561) (never executed)' -> Bitmap Heap Scan on place p (cost=16.01..20.27 rows=1
width=1561) (never executed)' Recheck Cond: (to_tsvector('simple'::regconfig,
(name)::text) @@ '''a'':*'::tsquery)' -> Bitmap Index Scan on place_name_index(cost=0.00..16.01 rows=1 width=0) (never executed)' Index Cond: (to_tsvector('simple'::regconfig,
(name)::text) @@ '''a'':*'::tsquery)' Planning time: 0.118 ms Execution time: 0.023 ms
I didn't get the number of read and hit buffers when I rexecute the query
many times.How can I Fix that? and I tried the options costs, timing and I
got the same plan query however when trying the option format json it
works.
