innodb结构解析工具---innodb_ruby

1.下载ruby并安装ruby:

　　ftp://ftp.ruby-lang.org/pub/ruby/

　　ftp://ftp.ruby-lang.org/pub/ruby/ruby-2.3-stable.tar.gz

　　tar -xvf ruby-2.3-stable.tar.gz

　　cd ruby-2.3.1

　　./configure

　　make

　　make install

2.下载rubygems：

　　https://rubygems.global.ssl.fastly.net/rubygems/rubygems-2.6.4.zip  （到https://rubygems.org/ 首页找的rubygems下载地址）

cd rubygems-2.6.4

ruby setup.rb

3.下载并安装innodb_ruby

　　https://rubygems.org/gems/innodb_ruby  （进入rubygems官网去找下载链接)

　　https://rubygems.global.ssl.fastly.net/gems/innodb_ruby-0.9.13.gem  (浏览器下载）

wget https://rubygems.global.ssl.fastly.net/rubygems/rubygems-2.6.4.zip --no-check-certificate   (wget下载)

　　gem install innodb_ruby-0.9.13.gem

  [root@localhost ~]# gem -v
　　2.6.

　　[root@localhost ~]# gem list |grep innodb
　　 innodb_ruby (0.9.13)

4.innodb_ruby使用文档:

　　https://github.com/jeremycole/innodb_ruby/wiki

　　https://blog.jcole.us/2013/01/03/a-quick-introduction-to-innodb-ruby/

https://blog.jcole.us/2014/10/02/visualizing-the-impact-of-ordered-vs-random-index-insertion-in-innodb/

http://luodw.cc/2016/03/15/innodb03/

5.实例:

进入到mysql数据目录：/data

[root@localhost data]# innodb_space -s ibdata1 system-spaces
name                            pages       indexes
(system)
mysql/innodb_index_stats
mysql/innodb_table_stats
mysql/slave_master_info
mysql/slave_relay_log_info
mysql/slave_worker_info
test/t1
test/test1
test/test_auto_increment
test/test_char
test/test_ci
test/test_int_n
test/test_time
test/test_unsigned                           

查看表t1索引
[root@localhost data]# innodb_space -s ibdata1 -T test/t1 space-indexes
id          name                            root        fseg        used        allocated   fill_factor
          PRIMARY                                    internal                          100.00%
          PRIMARY                                    leaf                              100.00%     

[root@localhost data]# innodb_space -s ibdata1 -T test/t1 space-indexes
id          name                            root        fseg        used        allocated   fill_factor
          PRIMARY                                    internal                          100.00%
          PRIMARY                                    leaf                              100.00%
You have new mail in /var/spool/mail/root
[root@localhost data]# innodb_space -s ibdata1 -T test/t1 space-lsn-age-illustrate            

  Start Page ╭────────────────────────────────────────────────────────────────╮
            │███████ │
             ╰────────────────────────────────────────────────────────────────╯

Legend (█ =  page):
       Min LSN <─────────────────────────────────────────> Max LSN
        ███████████████████████████████████████████   

$ irb -r innodb
> sys = Innodb::System.new("ibdata1")
> idx = sys.index_by_name("test/t1", "PRIMARY")
> rec = idx.binary_search([])

[root@localhost data]# innodb_space -s ibdata1 -T test/test1 space-extents-illustrate

  Start Page ╭────────────────────────────────────────────────────────────────╮
            │███▁??                                                          │
             ╰────────────────────────────────────────────────────────────────╯

Legend (█ =  page):
  Page Type                                                         Pages    Ratio
  █ System                                                                 50.00%
  █ Index  (test/test1.GEN_CLUST_INDEX)                                  16.67%
  ? Free space                                                             33.33%

[root@localhost data]# innodb_space -f test/t1.ibd space-page-type-regions
start       end         count       type
                                 FSP_HDR
                                 IBUF_BITMAP
                                 INODE
                                 INDEX
                                 FREE (ALLOCATED)    

[root@localhost data]# innodb_space -f test/t1.ibd -p  page-dump
#<Innodb::Page::Index:0x007f798307d970>:

fil header:
{:checksum=>,
 :offset=>,
 :prev=>nil,
 :next=>nil,
 :lsn=>,
 :type=>:INDEX,
 :flush_lsn=>,
 :space_id=>}

page header:
{:n_dir_slots=>,
 :heap_top=>,
 :garbage_offset=>,
 :garbage_size=>,
 :last_insert_offset=>,
 :direction=>:right,
 :n_direction=>,
 :n_recs=>,
 :max_trx_id=>,
 :level=>,
 :index_id=>,
 :n_heap=>,
 :format=>:compact}

fseg header:
{:leaf=>
  <Innodb::Inode space=<Innodb::Space file="test/t1.ibd", page_size=, pages=>, fseg=>,
 :internal=>
  <Innodb::Inode space=<Innodb::Space file="test/t1.ibd", page_size=, pages=>, fseg=>}

sizes:
  header
  trailer
  directory
  free
  used
  record
  per record     14.00

page directory:
[, ]

system records:
{:offset=>,
 :header=>
  {:next=>,
   :type=>:infimum,
   :heap_number=>,
   :n_owned=>,
   :min_rec=>false,
   :deleted=>false,
   :length=>},
 :next=>,
 :data=>"infimum\x00",
 :length=>}
{:offset=>,
 :header=>
  {:next=>,
   :type=>:supremum,
   :heap_number=>,
   :n_owned=>,
   :min_rec=>false,
   :deleted=>false,
   :length=>},
 :next=>,
 :data=>"supremum",
 :length=>}

garbage records:

records:
{:format=>:compact,
 :offset=>,
 :header=>
  {:next=>,
   :type=>:node_pointer,
   :heap_number=>,
   :n_owned=>,
   :min_rec=>true,
   :deleted=>false,
   :length=>},
 :next=>}

{:format=>:compact,
 :offset=>,
 :header=>
  {:next=>,
   :type=>:node_pointer,
   :heap_number=>,
   :n_owned=>,
   :min_rec=>false,
   :deleted=>false,
   :length=>},
 :next=>}

{:format=>:compact,
 :offset=>,
 :header=>
  {:next=>,
   :type=>:node_pointer,
   :heap_number=>,
   :n_owned=>,
   :min_rec=>false,
   :deleted=>false,
   :length=>},
 :next=>}

[root@localhost data]# innodb_space -f test/t1.ibd space-index-pages-summary
page        index   level   data    free    records