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#!/usr/bin/env python
#
# Public Domain 2014-2016 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# ex_stat.py
# This is an example demonstrating how to query database statistics.
import os
from wiredtiger import wiredtiger_open,WIREDTIGER_VERSION_STRING,stat
def main():
# Create a clean test directory for this run of the test program
os.system('rm -rf WT_HOME')
os.makedirs('WT_HOME')
# Connect to the database and open a session
conn = wiredtiger_open('WT_HOME', 'create,statistics=(all)')
session = conn.open_session()
# Create a simple table
session.create('table:access', 'key_format=S,value_format=S')
# Open a cursor and insert a record
cursor = session.open_cursor('table:access', None)
cursor['key'] = 'value'
cursor.close()
session.checkpoint()
print WIREDTIGER_VERSION_STRING
print_database_stats(session)
print_file_stats(session)
print_overflow_pages(session)
print_derived_stats(session)
conn.close()
def print_database_stats(session):
statcursor = session.open_cursor("statistics:")
print_cursor(statcursor)
statcursor.close()
def print_file_stats(session):
fstatcursor = session.open_cursor("statistics:table:access")
print_cursor(fstatcursor)
fstatcursor.close()
def print_overflow_pages(session):
ostatcursor = session.open_cursor("statistics:table:access")
val = ostatcursor[stat.dsrc.btree_overflow]
if val != 0:
print '%s=%s' % (str(val[0]), str(val[1]))
ostatcursor.close()
def print_derived_stats(session):
dstatcursor = session.open_cursor("statistics:table:access")
ckpt_size = dstatcursor[stat.dsrc.block_checkpoint_size][1]
file_size = dstatcursor[stat.dsrc.block_size][1]
percent = 0
if file_size != 0:
percent = 100 * ((float(file_size) - float(ckpt_size)) / float(file_size))
print "Table is %%%s fragmented" % str(percent)
app_insert = int(dstatcursor[stat.dsrc.cursor_insert_bytes][1])
app_remove = int(dstatcursor[stat.dsrc.cursor_remove_bytes][1])
app_update = int(dstatcursor[stat.dsrc.cursor_update_bytes][1])
fs_writes = int(dstatcursor[stat.dsrc.cache_bytes_write][1])
if app_insert + app_remove + app_update != 0:
print "Write amplification is " + '{:.2f}'.format(fs_writes / (app_insert + app_remove + app_update))
dstatcursor.close()
def print_cursor(mycursor):
while mycursor.next() == 0:
val = mycursor.get_value()
if val[1] != '0':
print '%s=%s' % (str(val[0]), str(val[1]))
if __name__ == "__main__":
main()
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