mirror of
https://github.com/FirebirdSQL/firebird-qa.git
synced 2025-01-22 21:43:06 +01:00
76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
#coding:utf-8
|
|
|
|
"""
|
|
ID: issue-3977
|
|
ISSUE: 3977
|
|
TITLE: MON$IO_STATS doesn't report page writes performed asynchronously (at the AST level)
|
|
DESCRIPTION:
|
|
Thanks to dimitr for suggestions about how this test can be implemented.
|
|
We have to read some part of data from table by "att_watcher", make small change in this table
|
|
by "att_worker" and finaly do commit + once again read this table in "att_watcher".
|
|
Counter mon$page_writes that will be obtained twise by "att_watcher" (before its two changes)
|
|
must differ.
|
|
|
|
::: NOTE-1 :::
|
|
We have to analyze counter mon$page_writes for attachment that is called "att_watcher" here,
|
|
despite that it does NOT change any in queried table!
|
|
|
|
::: NOTE-2 :::
|
|
Superserver should *not* be processed by this test because page cache is shared between all
|
|
attachments thus counter mon$page_writes is NOT changed in this scenario.
|
|
For this reason in SS we can only "simulate" proper outcome.
|
|
JIRA: CORE-3625
|
|
FBTEST: bugs.core_3625
|
|
"""
|
|
|
|
import pytest
|
|
from firebird.qa import *
|
|
|
|
init_script = """
|
|
recreate view v_check as
|
|
select i.mon$page_writes as iostat_pg_writes
|
|
from mon$attachments a
|
|
left join mon$io_stats i on a.mon$stat_id = i.mon$stat_id
|
|
where
|
|
a.mon$attachment_id <> current_connection
|
|
and a.mon$remote_protocol is not null
|
|
and i.mon$stat_group = 1 -- <<< ATTACHMENTS level
|
|
;
|
|
|
|
recreate table test(x int) ;
|
|
insert into test(x) values(1) ;
|
|
"""
|
|
|
|
db = db_factory(init=init_script)
|
|
|
|
act = python_act('db')
|
|
|
|
@pytest.mark.version('>=3')
|
|
def test_1(act: Action):
|
|
with act.db.connect() as worker_con, act.db.connect() as watcher_con:
|
|
watcher = watcher_con.cursor()
|
|
if act.vars['server-arch'] == 'SuperServer':
|
|
# SUPERSERVER SHOULD *NOT* BE PROCESSED BY THIS TEST
|
|
# COUNTER MON$PAGE_WRITES IS NOT CHANGED DURING RUN,
|
|
pytest.skip("Does not apply to SuperServer")
|
|
else:
|
|
# Do following in connection-WATCHER:
|
|
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
worker_con.execute_immediate('update test set x = 2 rows 1')
|
|
|
|
watcher.execute('select * from v_check') # get FIRST value of mon$page_writes
|
|
page_writes_at_point_1 = watcher.fetchone()[0]
|
|
|
|
# Again do in connection-worker: add small change to the data,
|
|
# otherwise watcher will not get any difference in mon$page_writes:
|
|
worker_con.execute_immediate('update test set x = 3 rows 1')
|
|
|
|
watcher.execute('select * from test')
|
|
watcher.fetchall()
|
|
|
|
watcher_con.commit()
|
|
watcher.execute('select * from v_check') # get SECOND value of mon$page_writes
|
|
page_writes_at_point_2 = watcher.fetchone()[0]
|
|
# PAGE_WRITES DIFFERENCE SIGN: 1
|
|
assert abs(page_writes_at_point_2 - page_writes_at_point_1) == 1
|