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onewait.py
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onewait.py
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"""
PythonDBAGraphs: Graphs to help with Oracle Database Tuning
Copyright (C) 2016 Robert Taft Durrett (Bobby Durrett)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Contact:
onewait.py
Graph of one wait event
"""
import myplot
import util
def onewait(wait_event,minimum_waits,start_time,end_time,instance_number):
q_string = """
select
sn.END_INTERVAL_TIME,
(after.total_waits-before.total_waits) NUMBER_OF_WAITS,
(after.time_waited_micro-before.time_waited_micro)/(after.total_waits-before.total_waits) AVG_MICROSECONDS
from DBA_HIST_SYSTEM_EVENT before, DBA_HIST_SYSTEM_EVENT after,DBA_HIST_SNAPSHOT sn
where before.event_name='"""
q_string += wait_event
q_string += """' and
END_INTERVAL_TIME
between
to_date('"""
q_string += start_time
q_string += """','DD-MON-YYYY HH24:MI:SS')
and
to_date('"""
q_string += end_time
q_string += """','DD-MON-YYYY HH24:MI:SS')
and
after.event_name=before.event_name and
after.snap_id=before.snap_id+1 and
after.instance_number = """
q_string += instance_number
q_string += """ and
before.instance_number=after.instance_number and
after.snap_id=sn.snap_id and
after.instance_number=sn.instance_number and
(after.total_waits-before.total_waits) > """
q_string += str(minimum_waits)
q_string += """
order by after.snap_id
"""
return q_string
database,dbconnection = util.script_startup('One wait event')
# Get user input
wait_event=util.input_with_default('wait event','db file sequential read')
min_waits=int(util.input_with_default('minimum number of waits per hour','0'))
start_time=util.input_with_default('Start date and time (DD-MON-YYYY HH24:MI:SS)','01-JAN-1900 12:00:00')
end_time=util.input_with_default('End date and time (DD-MON-YYYY HH24:MI:SS)','01-JAN-2200 12:00:00')
instance_number=util.input_with_default('Database Instance (1 if not RAC)','1')
# Build and run query
q = onewait(wait_event,min_waits,start_time,end_time,instance_number);
r = dbconnection.run_return_flipped_results(q)
util.exit_no_results(r)
# plot query
myplot.title = "'"+wait_event+"' waits on "+database+" database, instance "+instance_number+", minimum waits="+str(min_waits)
myplot.ylabel1 = "Number of events"
myplot.ylabel2 = "Averaged Elapsed Microseconds"
myplot.xdatetimes = r[0]
myplot.ylists = r[1:]
myplot.line_2subplots()