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activeshared.py
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activeshared.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:
activeshared.py
Average number of active shared server connections
"""
import myplot
import util
def activeshared(start_time,end_time,instance_number):
q_string = """select
sn.END_INTERVAL_TIME,
(after.SAMPLED_ACTIVE_CONN-before.SAMPLED_ACTIVE_CONN)/(after.NUM_SAMPLES - before.NUM_SAMPLES) average_active
from
DBA_HIST_SHARED_SERVER_SUMMARY before,
DBA_HIST_SHARED_SERVER_SUMMARY after,
DBA_HIST_SNAPSHOT sn
where
before.INSTANCE_NUMBER = """
q_string += instance_number
q_string += """
and
before.INSTANCE_NUMBER = sn.INSTANCE_NUMBER and
before.INSTANCE_NUMBER = after.INSTANCE_NUMBER and
before.SNAP_ID = sn.SNAP_ID and
before.SNAP_ID + 1 = after.SNAP_ID and
before.DBID = sn.DBID and
before.DBID = after.DBID and
after.NUM_SAMPLES > before.NUM_SAMPLES and
after.SAMPLED_ACTIVE_CONN >= before.SAMPLED_ACTIVE_CONN 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')
order by sn.SNAP_ID"""
return q_string
database,dbconnection = util.script_startup('Active shared server connections')
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 = activeshared(start_time,end_time,instance_number);
r = dbconnection.run_return_flipped_results(q)
# plot query
myplot.title = "Active shared server connections on "+database+" database, instance "+instance_number
myplot.ylabel1 = "Number of active sessions"
myplot.xdatetimes = r[0]
myplot.ylists = r[1:]
myplot.line()