查看mysql表空间python代码

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

mylib.py

#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])

py_innodb_page_info.py

#! /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)