概述

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

今天主要介绍一个比较有趣的解析器，也是对 InooDB 格式文件的解析器，用于 Ruby 语言，下面一起来看看吧~

1、Installing using RubyGems

sudo gem install innodb_ruby

2、测试运行

innodb_space ...

3、基础用法

Basics of using innodb_space from the command line. There are two ways to start innodb_space.

Against a single space file (ibdata or .ibd):

Against a system tablespace which will auto-load file-per-table tablespace files:

4、Space File Structure

4.1、system-spaces

List all tablespaces available from the system, including some basic stats. This is basically a list of tables:

innodb_space -s ibdata1 system-spaces

4.2、space-indexes

List all indexes available from the space (system space or file-per-table space):

innodb_space -s /var/lib/mysql/ibdata1 -T jumpserver/assets_asset space-indexes

4.3、space-page-type-regions

Iterate through all pages in a space and print a summary of page types coalesced into “regions” of same-type pages:

innodb_space -s /var/lib/mysql/ibdata1 -T jumpserver/assets_asset space-page-type-regions

4.4、space-page-type-summary

Iterate through all pages and print a summary of total counts of pages by type:

innodb_space -s ibdata1 -T jumpserver/assets_asset space-page-type-summary

4.5、space-extents-illustrate

Illustrate all pages in all extents in the space, showing a colorized block (colored by index/purpose) for each page, sized based on the amount of data in the page:

innodb_space -s ibdata1 -T jumpserver/assets_asset space-extents-illustrate

4.6、space-lsn-age-illustrate

Illustrate all pages in all extents in the space, showing a colorized block (colored by the age of the modification LSN for the page):

innodb_space -s ibdata1 -T jumpserver/assets_asset space-lsn-age-illustrate

5、Page Structure

5.1、page-account

Given any page number, explain what the page is used for (for most structures):

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 3 page-account

5.2、page-dump

Intelligently dump the contents of a page including a representation of most structures that innodb_ruby understands:

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 3 page-dump

5.3、page-records

Summarize all records within the page:

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 3 page-records

5.4、page-directory-summary

Dump the contents of the page directory for a page

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 7 page-directory-summary

5.5、page-illustrate

Illustrate the content of a page:

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 7 page-illustrate

6、Index Structure

6.1、index-recurse

Recurse an index (perform a full index scan) by following the entire B+Tree (scanning all pages by recursion, not just the leaf pages by list):

innodb_space -s ibdata1 -T jumpserver/assets_asset -I PRIMARY index-recurse

6.2、index-record-offsets

Recurse an index as index-recurse does, but print the offset of each record within the index pages:

innodb_space -s ibdata1 -T jumpserver/assets_asset -I PRIMARY index-record-offsets

6.3、index-level-summary

Print a summary of all index pages at a given level:

innodb_space -s ibdata1 -T jumpserver/assets_asset -I PRIMARY -l 0 index-level-summary

7、Record Structure

7.1、record-dump

Given a record offset, dump a detailed description of a record and the data it contains:

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 7 -R 128 record-dump

8、Record History

8.1、record-history

Summarize the history (undo logs) of a record:

innodb_space -s ibdata1 -T jumpserver/assets_asset -p 7 -R 128 record-history

9、Additional exploration

9.1、space-lists

Show a summary of the lists (free, free_frag, full_frag, free_inodes, and full_inodes) for the space, including the list length and the list node information of the first and last pages in the list:

innodb_space -s ibdata1 space-lists

9.2、space-list-iterate

Iterate through all extents in a list and show the extents or inodes in the list:

innodb_space -s ibdata1 space-list-iterate -L free_frag

9.3、space-inodes-summary

Print summary information for each inode in the space:

innodb_space -s ibdata1 space-inodes-summary

9.4、undo-history-summary

Print a summary of all records in the history list (undo logs):

innodb_space -s ibdata1 undo-history-summary

9.5、undo-record-dump

Print a detailed description of an undo record and the data it contains:

innodb_space -s ibdata1 -p page -R offset undo-record-dump

觉得有用的朋友多帮忙转发哦！后面会分享更多devops和DBA方面的内容，感兴趣的朋友可以关注下~