about explain analyze

Hello!

Explain analyze takes 3 times more time for execution. Why?

wow=# \timing
Timing is on.
wow=# select max(click.accesses) from click;
max
----------
10944762
(1 row)

Time: 105,654 ms
wow=# explain analyze select max(click.accesses) from click;
QUERY PLAN

-----------------------------------------------------------------------------------------------------------------
Aggregate (cost=1103.70..1103.70 rows=1 width=8) (actual
time=289.391..289.393 rows=1 loops=1)
-> Seq Scan on click (cost=0.00..971.36 rows=52936 width=8) (actual
time=0.013..133.943 rows=52936 loops=1)
Total runtime: 289.498 ms
(3 rows)

Time: 290,695 ms
wow=# select version();
version

---------------------------------------------------------------------------------------------------------
PostgreSQL 7.4 on i386-unknown-freebsd5.1, compiled by GCC gcc (GCC) 3.2.2
[FreeBSD] 20030205 (release)
(1 row)

--
Teodor Sigaev E-mail: teodor(at)sigaev(dot)ru