Обсуждение: test commit_delay
I am trying to see the impact of commit_delay.
Set it to 100000 (microseconds), i.e. to 100ms
synchronous_commit is kept to default (i.e. ON)
Now I expect my DML statements to take atleast 100ms. But when I try to execute a few and measure using the timing command of postgres or the time command of linux, the duration is just a few milliseconds.
time /usr/local/pgsql/bin/psql -c "insert into abc values(1);" test
INSERT 0 1
real 0m0.010s
user 0m0.000s
sys 0m0.000s
OR
test=# \timing
Timing is on.
test=# insert into abc values(1);
INSERT 0 1
Time: 2.637 ms
What am I doing wrong ?
Thanks.
A J <s5aly@yahoo.com> wrote: > Now I expect my DML statements to take atleast 100ms. But when I > try to execute a few and measure using the timing command of > postgres or the time command of linux, the duration is just a few > milliseconds. > What am I doing wrong ? Have you changed commit_siblings from the default of 5? Do you have at least commit_siblings other transactions open? -Kevin