Percona-Tookit工具包之pt-mext

 

Preface

 

    We are always obliged to analyze many outputs generated by various tools directly even in flat text files in server performance diagnosis.Further more,we need to compare the differences depend on these results such as the output of "mysqladmin" tool.

 

Introduce

 

    pt-mext is tht very tool which can help you to accomplish the work mentioned above easily.It can execute the command which you specify then print the result side-by-side in one line.Not only can it print results from a running program but also can it print results from a flat text file.

 

Procedure

 

Usage

 pt-mext [OPTIONS] -- COMMAND

Common Parameters

 --relative //Each column substracts the value of the column before it.

Example

 

Collect the global status of MySQL with 1s interval and 3 times in all by mysqladmin.

 [root@zlm2 :: ~]
 #mysqladmin ext -i1 -c3 > mysqladmin.log

 [root@zlm2 :: ~]
 #ls -l
 total
 -rw-------.   root root        Jul    anaconda-ks.cfg
 -rwxr-xr-x    root root  Jun  : mysql-5.7.-linux-glibc2.-x86_64.tar
 -rw-r--r--    root root      Jul  : mysqladmin.log
 -rwxr-xr-x    root root          Jun  : mysqld.sh
 -rwxr-xr-x    root root     Jun  : percona-toolkit-3.0.-.el7.x86_64.rpm
 drwxr-xr-x   root root        Jul   : sysbench-1.0

The "mysqladmin.log" file contains all the output of the three times individually.

 [root@zlm2 :: ~]
 #cat mysqladmin.log
 +-----------------------------------------------+--------------------------------------------------+
 | Variable_name                                 | Value                                            |
 +-----------------------------------------------+--------------------------------------------------+
 | Aborted_clients                               |                                                 |
 | Aborted_connects                              |                                                 |
 | Binlog_cache_disk_use                         |                                                 |
 | Binlog_cache_use                              |                                                 |
 | Binlog_stmt_cache_disk_use                    |                                                 |
 | Binlog_stmt_cache_use                         |                                                 |
 | Bytes_received                                |                                              |
 | Bytes_sent                                    |                                            |
 | Com_admin_commands                            |                                                 |
 | Com_assign_to_keycache                        |                                                 |
 | Com_alter_db                                  |                                                 |
 | Com_alter_db_upgrade                          |                                                 |
 ...

 +-----------------------------------------------+--------------------------------------------------+
 | Variable_name                                 | Value                                            |
 +-----------------------------------------------+--------------------------------------------------+
 | Aborted_clients                               |                                                 |
 | Aborted_connects                              |                                                 |
 | Binlog_cache_disk_use                         |                                                 |
 | Binlog_cache_use                              |                                                 |
 | Binlog_stmt_cache_disk_use                    |                                                 |
 | Binlog_stmt_cache_use                         |                                                 |
 | Bytes_received                                |                                              |
 | Bytes_sent                                    |                                            |
 | Com_admin_commands                            |                                                 |
 | Com_assign_to_keycache                        |                                                 |
 | Com_alter_db                                  |                                                 |
 | Com_alter_db_upgrade                          |                                                 |
 ...

 +-----------------------------------------------+--------------------------------------------------+
 | Variable_name                                 | Value                                            |
 +-----------------------------------------------+--------------------------------------------------+
 | Aborted_clients                               |                                                 |
 | Aborted_connects                              |                                                 |
 | Binlog_cache_disk_use                         |                                                 |
 | Binlog_cache_use                              |                                                 |
 | Binlog_stmt_cache_disk_use                    |                                                 |
 | Binlog_stmt_cache_use                         |                                                 |
 | Bytes_received                                |                                              |
 | Bytes_sent                                    |                                            |
 | Com_admin_commands                            |                                                 |
 | Com_assign_to_keycache                        |                                                 |
 | Com_alter_db                                  |                                                 |
 | Com_alter_db_upgrade                          |                                                 |

Execute pt-mext to print them again with the "mysqladmin.log" file.

 [root@zlm2 :: ~]
 #pt-mext -- cat mysqladmin.log
 Aborted_clients
 Aborted_connects
 Binlog_cache_disk_use
 Binlog_cache_use
 Binlog_stmt_cache_disk_use
 Binlog_stmt_cache_use
 Bytes_received
 Bytes_sent
 Com_admin_commands
 Com_alter_db
 Com_alter_db_upgrade
 ...

 //pt-mext arranges the results of those three times side-by-side and print them.
 //The first column shows the first collected result and the second column shows the second one.
 //The number of columns is n-1(n is the collection times here).

Specify the "--relative" option to get the differential data.

 [root@zlm2 :: ~]
 #pt-mext --relative -- cat mysqladmin.log
 Aborted_clients
 Aborted_connects
 Binlog_cache_disk_use
 Binlog_cache_use
 Binlog_stmt_cache_disk_use
 Binlog_stmt_cache_use
 Bytes_received                                    //2277-2142=35
 Bytes_sent                                    //165275-155447=9828
 Com_admin_commands
 Com_alter_db
 Com_alter_db_upgrade                                 

 //Differential data is more distinct for us to know about the variation of performance.
 //Even though we use "--relative" option,there're still two columns here.

Execute pt-mext without flat text file.

 [root@zlm2 :: ~]
 #pt-mext -r -- mysqladmin ext -i1 -c3
 Aborted_clients
 Aborted_connects
 Binlog_cache_disk_use
 Binlog_cache_use
 Binlog_stmt_cache_disk_use
 Binlog_stmt_cache_use
 Bytes_received
 Bytes_sent
 Com_admin_commands
 Com_alter_db
 Com_alter_db_upgrade
 ...

 [root@zlm2 :: ~]
 #pt-mext -- mysqladmin ext -i1 -c3
 Aborted_clients
 Aborted_connects
 Binlog_cache_disk_use
 Binlog_cache_use
 Binlog_stmt_cache_disk_use
 Binlog_stmt_cache_use
 Bytes_received
 Bytes_sent
 Com_admin_commands
 Com_alter_db
 Com_alter_db_upgrade
 ...

Summary

• pt-mext has only three options and it is rather easy to use.
• pt-mext is a useful tool in anaylzing differential data of global status of  MySQL.
• pt-mext can be used not not only in "mysqladmin" program but also others.