Em 05-12-2017 15:25, Tom Lane escreveu:
Alvaro Herrera <alvherre@xxxxxxxxxxxxxx> writes:
Rodrigo Rosenfeld Rosas wrote:
explain analyze delete from field_values where transaction_id=226;
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------
Delete on field_values (cost=0.43..257.93 rows=481 width=6) (actual
time=367375.805..367375.805 rows=0 loops=1)
-> Index Scan using index_field_values_on_transaction_id on
field_values (cost=0.43..257.93 rows=481 width=6) (actual time=0.223..4.216
rows=651 loops=1)
Index Cond: (transaction_id = 226)
Planning time: 0.234 ms
Execution time: 367375.882 ms
(5 registros)
Time: 367377,085 ms (06:07,377)
Normally this is because you lack indexes on the referencing columns, so
the query that scans the table to find the referencing rows is a
seqscan.
Actually though ... the weird thing about this is that I'd expect to
see a separate line in the EXPLAIN output for time spent in the FK
trigger. Where'd that go?
regards, tom lane
Yes, I was also hoping to get more insights through the EXPLAIN output :)
