*db.executesql()* takes 30 seconds to return a result, despite the fact
that same query takes 0.5-1 second if I try it on the MySQL console or with
the same code on the web2py debug console or on the web2py shell.
I tried the following cases:
... #Irrelevant part of the code
raw_data = dbs.executesql(query, as_dict=True) #Takes 30 seconds to return a
resultfrom gluon.debug import dbg
dbg.set_trace() #After this line, I'm on the debug console
raw_data = dbs.executesql(query, as_dict=True) #Takes <1 second to return a
result
dbs._timings #print
dbs._timings #From the first test above
[('SELECT 1;', 0.016000032424926758), #web2py or driver stuff, I didn't
execute it.
('SET FOREIGN_KEY_CHECKS=1;', 0.003999948501586914), #web2py or driver
stuff, I didn't execute it.
("SET sql_mode='NO_BACKSLASH_ESCAPES';", 0.00800013542175293), #web2py or
driver stuff, I didn't execute it.
("SELECT TIMESTAMPDIFF(...) AS 'duration',\n
TIMESTAMPDIFF(...)\n
- INTERVAL 1 HOUR, TIMESTAMP(...)\n
+ INTERVAL CAST(...) AS 'timediff',\n
ris.ODATE as 'date',\n
CONCAT(...) as 'service'\n
FROM ... AS ris\n
JOIN ... as sd on ris.... = sd....\n
WHERE ris.... != '0000-00-00 00:00:00'\n
and ris.... != '0000-00-00 00:00:00'\n
and ris.... >= '2010-8-15'\n
and ris.... <= '2014-8-22'", 32.0460000038147), # Slow
query/code, executed on page view.
("SELECT TIMESTAMPDIFF(...) AS 'duration',\n
TIMESTAMPDIFF(...)\n
- INTERVAL 1 HOUR, TIMESTAMP(...)\n
+ INTERVAL CAST(...) AS 'timediff',\n
ris.ODATE as 'date',\n
CONCAT(...) as 'service'\n
FROM ... AS ris\n
JOIN ... as sd on ris.... = sd....\n
WHERE ris.... != '0000-00-00 00:00:00'\n
and ris.... != '0000-00-00 00:00:00'\n
and ris.... >= '2010-8-15'\n
and ris.... <= '2014-8-22'", 0.6069998741149902) #Same
query/code, exec. on the debug console]
and
... #Irrelevant part of the codefrom gluon.debug import dbg
dbg.set_trace() #After this line, I'm on the debug console
raw_data = dbs.executesql(query, as_dict=True) #Takes <1 second to return a
result
Things got interesting when I try to execute more queries consecutively:
... #Irrelevant part of the code
raw_data = dbs.executesql(query, as_dict=True) #Takes 7 seconds to return a
result
raw_data = dbs.executesql(query, as_dict=True) #Takes 7 seconds to return a
result
raw_data = dbs.executesql(query, as_dict=True) #Takes 7 seconds to return a
resultfrom gluon.debug import dbg
dbg.set_trace() #After this line, I'm on the debug console
raw_data = dbs.executesql(query, as_dict=True) #Takes <1 second to return a
result
on HeidiSQL
/* Affected rows: 0 Found rows: 7,391 Warnings: 0 Duration for 1 query:
0.000 sec. (+ 0.078 sec. network) */
Also posted on stackoverflow
<http://stackoverflow.com/questions/25644441/extremely-slow-raw-sql-queries-on-web2py>
--
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- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
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