diff options
Diffstat (limited to 'src/third_party/wiredtiger/examples/python/ex_stat.py')
-rwxr-xr-x | src/third_party/wiredtiger/examples/python/ex_stat.py | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/src/third_party/wiredtiger/examples/python/ex_stat.py b/src/third_party/wiredtiger/examples/python/ex_stat.py new file mode 100755 index 00000000000..10f1d6d597c --- /dev/null +++ b/src/third_party/wiredtiger/examples/python/ex_stat.py @@ -0,0 +1,109 @@ +#!/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() + |