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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()
+