py_innodb_page_info工具使用
此工具是《MySQL技术内幕 InnoDB存储引擎》作者姜承尧写的用来分析表空间中的各页得类型和信息，用python编写。此工具由三个文件py_innodb_page_info.py和mylib.py以及include.py组成。需要放在同一个目录下，chmod 755 这三个文件的权限。
#! /usr/bin/env python
#encoding=utf-8
import mylib
from sys import argv
from mylib import myargv
if __name__ == '__main__':
myargv = myargv(argv)
if myargv.parse_cmdline() == 0:
pass
else:
mylib.get_innodb_page_type(myargv)#encoding=utf-8
import os
import include
from include import *
TABLESPACE_NAME='D:\\mysql_data\\test\\t.ibd'
VARIABLE_FIELD_COUNT = 1
NULL_FIELD_COUNT = 0
class myargv(object):
def __init__(self, argv):
self.argv = argv
self.parms = {}
self.tablespace = ''
def parse_cmdline(self):
argv = self.argv
if len(argv) == 1:
print 'Usage: python py_innodb_page_info.py [OPTIONS] tablespace_file'
print 'For more options, use python py_innodb_page_info.py -h'
return 0
while argv:
if argv[0][0] == '-':
if argv[0][1] == 'h':
self.parms[argv[0]] = ''
argv = argv[1:]
break
if argv[0][1] == 'v':
self.parms[argv[0]] = ''
argv = argv[1:]
else:
self.parms[argv[0]] = argv[1]
argv = argv[2:]
else:
self.tablespace = argv[0]
argv = argv[1:]
if self.parms.has_key('-h'):
print 'Get InnoDB Page Info'
print 'Usage: python py_innodb_page_info.py [OPTIONS] tablespace_file\n'
print 'The following options may be given as the first argument:'
print '-h help '
print '-o output put the result to file'
print '-t number thread to anayle the tablespace file'
print '-v verbose mode'
return 0
return 1
def mach_read_from_n(page,start_offset,length):
ret = page[start_offset:start_offset+length]
return ret.encode('hex')
def get_innodb_page_type(myargv):
f=file(myargv.tablespace,'rb')
fsize = os.path.getsize(f.name)/INNODB_PAGE_SIZE
ret = {}
for i in range(fsize):
page = f.read(INNODB_PAGE_SIZE)
page_offset = mach_read_from_n(page,FIL_PAGE_OFFSET,4)
page_type = mach_read_from_n(page,FIL_PAGE_TYPE,2)
if myargv.parms.has_key('-v'):
if page_type == '45bf':
page_level = mach_read_from_n(page,FIL_PAGE_DATA+PAGE_LEVEL,2)
print "page offset %s, page type <%s>, page level <%s>"%(page_offset,innodb_page_type[page_type],page_level)
else:
print "page offset %s, page type <%s>"%(page_offset,innodb_page_type[page_type])
if not ret.has_key(page_type):
ret[page_type] = 1
else:
ret[page_type] = ret[page_type] + 1
print "Total number of page: %d:"%fsize
for type in ret:
print "%s: %s"%(innodb_page_type[type],ret[type])#include.py
#encoding=utf-8
INNODB_PAGE_SIZE = 16*1024*1024
# Start of the data on the page
FIL_PAGE_DATA = 38
FIL_PAGE_OFFSET = 4 # page offset inside space
FIL_PAGE_TYPE = 24 # File page type
# Types of an undo log segment */
TRX_UNDO_INSERT = 1
TRX_UNDO_UPDATE = 2
# On a page of any file segment, data may be put starting from this offset
FSEG_PAGE_DATA = FIL_PAGE_DATA
# The offset of the undo log page header on pages of the undo log
TRX_UNDO_PAGE_HDR = FSEG_PAGE_DATA
PAGE_LEVEL = 26 #level of the node in an index tree; the leaf level is the level 0 */
innodb_page_type={
'0000':u'Freshly Allocated Page',
'0002':u'Undo Log Page',
'0003':u'File Segment inode',
'0004':u'Insert Buffer Free List',
'0005':u'Insert Buffer Bitmap',
'0006':u'System Page',
'0007':u'Transaction system Page',
'0008':u'File Space Header',
'0009':u')'扩展描述页',
'000a':u'Uncompressed BLOB Page',
'000b':u'1st compressed BLOB Page',
'000c':u'Subsequent compressed BLOB Page',
'45bf':u'B-tree Node'
}
innodb_page_direction={
'0000': 'Unknown(0x0000)',
'0001': 'Page Left',
'0002': 'Page Right',
'0003': 'Page Same Rec',
'0004': 'Page Same Page',
'0005': 'Page No Direction',
'ffff': 'Unkown2(0xffff)'
}
INNODB_PAGE_SIZE=1024*16 # InnoDB Page 16K/data/python
[root@vast python]# ll
total 12
-rwxr-xr-x 1 root root 1263 Oct 16 11:24 include.py
-rwxr-xr-x 1 root root 2179 Oct 16 11:24 mylib.py
-rwxr-xr-x 1 root root 234 Oct 16 11:23 py_innodb_page_info.py
[root@vast python]# python py_innodb_page_info.py /data/mydb/vastdata/t1.ibd
Total number of page: 576: #分配的页数目
Freshly Allocated Page: 489 #空闲页数目
Insert Buffer Bitmap: 1 #系统Insert Buffer Bitmap拥有的页数目
File Space Header: 1 #系统File Space Header拥有的页数目
B-tree Node: 84 #存放数据的数据页数目
File Segment inode: 1 #系统File Segment inode拥有的页数目
加 -v 会显示出t2.ibd这个数据文件中的页的分布
[root@vast python]# python py_innodb_page_info.py -v /data/mydb/vastdata/t2.ibd
page offset 00000000, page type
page offset 00000001, page type
page offset 00000002, page type
page offset 00000003, page type
page offset 00000000, page type
page offset 00000000, page type
Total number of page: 6:
Freshly Allocated Page: 2
Insert Buffer Bitmap: 1
File Space Header: 1
B-tree Node: 1
File Segment inode: 1