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nologging.py
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nologging.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:
nologging.py
Shows write I/O statistics that may relate to nologging write I/O in time period.
"""
import myplot
import util
def nologging(start_time,end_time,instance_number):
"""
NOLOGGING activity by snapshot
"""
q_string = """
select
sn.END_INTERVAL_TIME,
(adirect.SMALL_WRITE_MEGABYTES+adirect.LARGE_WRITE_MEGABYTES-bdirect.SMALL_WRITE_MEGABYTES-bdirect.LARGE_WRITE_MEGABYTES),
(adbwr.SMALL_WRITE_MEGABYTES+adbwr.LARGE_WRITE_MEGABYTES-bdbwr.SMALL_WRITE_MEGABYTES-bdbwr.LARGE_WRITE_MEGABYTES),
(algwr.SMALL_WRITE_MEGABYTES+algwr.LARGE_WRITE_MEGABYTES-blgwr.SMALL_WRITE_MEGABYTES-blgwr.LARGE_WRITE_MEGABYTES)
from
DBA_HIST_IOSTAT_FUNCTION bdirect,
DBA_HIST_IOSTAT_FUNCTION adirect,
DBA_HIST_IOSTAT_FUNCTION bdbwr,
DBA_HIST_IOSTAT_FUNCTION adbwr,
DBA_HIST_IOSTAT_FUNCTION blgwr,
DBA_HIST_IOSTAT_FUNCTION algwr,
DBA_HIST_SNAPSHOT sn
where
adirect.snap_id=bdirect.snap_id+1 and
adirect.snap_id=adbwr.snap_id and
adirect.snap_id=algwr.snap_id and
bdirect.snap_id=bdbwr.snap_id and
bdirect.snap_id=blgwr.snap_id and
bdirect.instance_number=adirect.instance_number and
bdbwr.instance_number=adbwr.instance_number and
blgwr.instance_number=algwr.instance_number and
adirect.snap_id=sn.snap_id and
adirect.instance_number=sn.instance_number and
adirect.FUNCTION_NAME = 'Direct Writes' and
bdirect.FUNCTION_NAME = adirect.FUNCTION_NAME and
adbwr.FUNCTION_NAME = 'DBWR' and
bdbwr.FUNCTION_NAME = adbwr.FUNCTION_NAME and
algwr.FUNCTION_NAME = 'LGWR' and
blgwr.FUNCTION_NAME = algwr.FUNCTION_NAME and
sn.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 adirect.INSTANCE_NUMBER = """
q_string += instance_number
q_string += """
order by sn.END_INTERVAL_TIME
"""
return q_string
database,dbconnection = util.script_startup('NOLOGGING Write IO')
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')
querytext = nologging(start_time,end_time,instance_number)
results = dbconnection.run_return_flipped_results(querytext)
util.exit_no_results(results)
# plot query
myplot.xdatetimes = results[0]
myplot.ylists = results[1:]
myplot.title = "Write IO that may relate to NOLOGGING for "+database+" database, instance "+instance_number
myplot.ylabel1 = "Megabytes"
myplot.ylistlabels=["Direct Writes","DBWR","LGWR"]
myplot.line()