110 lines
3.7 KiB
Python
Executable File
110 lines
3.7 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# Public Domain 2014-2015 MongoDB, Inc.
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# Public Domain 2008-2014 WiredTiger, Inc.
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#
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# This is free and unencumbered software released into the public domain.
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#
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# Anyone is free to copy, modify, publish, use, compile, sell, or
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# distribute this software, either in source code form or as a compiled
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# binary, for any purpose, commercial or non-commercial, and by any
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# means.
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#
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# In jurisdictions that recognize copyright laws, the author or authors
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# of this software dedicate any and all copyright interest in the
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# software to the public domain. We make this dedication for the benefit
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# of the public at large and to the detriment of our heirs and
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# successors. We intend this dedication to be an overt act of
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# relinquishment in perpetuity of all present and future rights to this
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# software under copyright law.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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# OTHER DEALINGS IN THE SOFTWARE.
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#
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# ex_stat.py
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# This is an example demonstrating how to query database statistics.
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import os
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from wiredtiger import wiredtiger_open,WIREDTIGER_VERSION_STRING,stat
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def main():
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# Create a clean test directory for this run of the test program
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os.system('rm -rf WT_HOME')
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os.makedirs('WT_HOME')
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# Connect to the database and open a session
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conn = wiredtiger_open('WT_HOME', 'create,statistics=(all)')
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session = conn.open_session()
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# Create a simple table
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session.create('table:access', 'key_format=S,value_format=S')
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# Open a cursor and insert a record
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cursor = session.open_cursor('table:access', None)
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cursor['key'] = 'value'
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cursor.close()
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session.checkpoint()
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print WIREDTIGER_VERSION_STRING
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print_database_stats(session)
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print_file_stats(session)
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print_overflow_pages(session)
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print_derived_stats(session)
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conn.close()
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def print_database_stats(session):
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statcursor = session.open_cursor("statistics:")
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print_cursor(statcursor)
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statcursor.close()
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def print_file_stats(session):
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fstatcursor = session.open_cursor("statistics:table:access")
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print_cursor(fstatcursor)
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fstatcursor.close()
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def print_overflow_pages(session):
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ostatcursor = session.open_cursor("statistics:table:access")
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val = ostatcursor[stat.dsrc.btree_overflow]
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if val != 0:
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print '%s=%s' % (str(val[0]), str(val[1]))
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ostatcursor.close()
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def print_derived_stats(session):
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dstatcursor = session.open_cursor("statistics:table:access")
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ckpt_size = dstatcursor[stat.dsrc.block_checkpoint_size][1]
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file_size = dstatcursor[stat.dsrc.block_size][1]
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percent = 0
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if file_size != 0:
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percent = 100 * ((float(file_size) - float(ckpt_size)) / float(file_size))
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print "Table is %%%s fragmented" % str(percent)
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app_insert = int(dstatcursor[stat.dsrc.cursor_insert_bytes][1])
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app_remove = int(dstatcursor[stat.dsrc.cursor_remove_bytes][1])
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app_update = int(dstatcursor[stat.dsrc.cursor_update_bytes][1])
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fs_writes = int(dstatcursor[stat.dsrc.cache_bytes_write][1])
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if app_insert + app_remove + app_update != 0:
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print "Write amplification is " + '{:.2f}'.format(fs_writes / (app_insert + app_remove + app_update))
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dstatcursor.close()
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def print_cursor(mycursor):
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while mycursor.next() == 0:
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val = mycursor.get_value()
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if val[1] != '0':
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print '%s=%s' % (str(val[0]), str(val[1]))
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if __name__ == "__main__":
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main()
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