Innotop – MySQL Performance Monitor Tool for Linux

Innotop is an excellent command-line program, similar to the top command, to monitor local and remote MySQL servers running under the InnoDB engine.

Innotop comes with many features and different types of modes/options, which help monitor various aspects of MySQL performance and also assist database administrators in identifying issues with the MySQL server.

For example, Innotop helps in monitoring MySQL replication status, user statistics, query lists, InnoDB buffers, InnoDB I/O information, open tables, lock tables, etc. It refreshes its data regularly, allowing you to see updated results.

Innotop comes with great features and flexibility and doesn’t need any extra configuration. It can be executed by simply running the ‘innotop‘ command from the terminal.

Install Innotop (MySQL Monitoring) Tool in Linux

Innotop is available in your distribution’s package manager, you can install it using your package manager as shown.

sudo apt install innotop         [On Debian, Ubuntu and Mint]
sudo yum install innotop         [On RHEL/CentOS/Fedora and Rocky/AlmaLinux]

If innotop is not available in your distribution’s package repository, you can clone the Git repository and install it as shown.

git clone https://github.com/innotop/innotop.git
cd innotop

Next, you need to install some Perl dependencies uisng CPAN or cpanminus. If you don’t have cpanminus installed, you can install it using your package manager:

sudo apt install cpanminus      [On Debian, Ubuntu and Mint]
sudo dnf install cpanminus      [On RHEL/CentOS/Fedora and Rocky/AlmaLinux]

Finally, install the required Perl modules using cpanminus as shown.

cpanm Term::ReadKey DBI DBD::mysql

After installing the dependencies, you can run Innotop using the following command:

perl innotop

First, you need to inssall cpanminus, a lightweight and user-friendly client for CPAN, which is a repository of Perl modules and software that simplified that installation of Perl modules and their dependencies.

sudo ap install cpanminus        # For Debian/Ubuntu
sudo yum install cpanminus       # For CentOS/RHEL

Next, install following Perl module dependencies.

cpanm Term::ReadKey DBI DBD::mysql

Then, install Innotop:

sudo cpanm innotop

To start innotop, simply type “innotop” and specify options -u (username) and -p (password) respectively, from the command line and press Enter.

# innotop -u root -p 'tecm1nt'

Once you’ve connected to MySQL server, you should see something similar to the following screen.

[RO] Dashboard (? for help)                                                                    localhost, 61d, 254.70 QPS, 5/2/200 con/run/cac thds, 5.1.61-log
Uptime  MaxSQL  ReplLag  Cxns  Lock  QPS     QPS  Run  Run  Tbls  Repl   SQL
   61d                      4     0  254.70  _         _     462  Off 1
Innotop Help

Press “?” to get the summary of command line options and usage.

Switch to a different mode:
   A  Dashboard         I  InnoDB I/O Info     Q  Query List
   B  InnoDB Buffers    K  InnoDB Lock Waits   R  InnoDB Row Ops
   C  Command Summary   L  Locks               S  Variables & Status
   D  InnoDB Deadlocks  M  Replication Status  T  InnoDB Txns
   F  InnoDB FK Err     O  Open Tables         U  User Statistics

Actions:
   d  Change refresh interval        p  Pause innotop
   k  Kill a query's connection      q  Quit innotop
   n  Switch to the next connection  x  Kill a query

Other:
 TAB  Switch to the next server group   /  Quickly filter what you see
   !  Show license and warranty         =  Toggle aggregation
   #  Select/create server groups       @  Select/create server connections
   $  Edit configuration settings       \  Clear quick-filters
Press any key to continue

This section contains screen shots of innotop usage. Use Upper-case keys to switch between modes.

User Statistics

This mode displays user statistics and index statistics sorted by reads.

CXN        When   Load  QPS    Slow  QCacheHit  KCacheHit  BpsIn    BpsOut 
localhost  Total  0.00  1.07k   697      0.00%     98.17%  476.83k  242.83k
Query List

This mode displays the output from SHOW FULL PROCESSLIST, similar to mytop’s query list mode. This feature doesn’t display InnoDB information and it’s most useful for general usage.

When   Load  Cxns  QPS   Slow  Se/In/Up/De%             QCacheHit  KCacheHit  BpsIn    BpsOut
Now    0.05     1  0.20     0   0/200/450/100               0.00%    100.00%  882.54   803.24
Total  0.00   151  0.00     0  31/231470/813290/188205      0.00%     99.97%    1.40k    0.22

Cmd      ID      State               User      Host           DB      Time      Query
Connect      25  Has read all relay  system u                         05:26:04
InnoDB I/O Info

This mode displays InnoDB’s I/O statistics, pending I/O, I/O threads, file I/O and log statistics tables by default.

____________________ I/O Threads ____________________
Thread  Purpose               Thread Status          
     0  insert buffer thread  waiting for i/o request
     1  log thread            waiting for i/o request
     2  read thread           waiting for i/o request
     3  write thread          waiting for i/o request

____________________________ Pending I/O _____________________________
Async Rds  Async Wrt  IBuf Async Rds  Sync I/Os  Log Flushes  Log I/Os
        0          0               0          0            0         0

________________________ File I/O Misc _________________________
OS Reads  OS Writes  OS fsyncs  Reads/Sec  Writes/Sec  Bytes/Sec
      26          3          3       0.00        0.00          0

_____________________ Log Statistics _____________________
Sequence No.  Flushed To  Last Checkpoint  IO Done  IO/Sec
0 5543709     0 5543709   0 5543709              8    0.00
InnoDB Buffers

This section, you will see information about the InnoDB buffer pool, page statistics, insert buffer, and adaptive hash index. The data fetches from SHOW INNODB STATUS.

__________________________ Buffer Pool __________________________
Size  Free Bufs  Pages  Dirty Pages  Hit Rate  Memory  Add'l Pool
 512        492     20            0  --        16.51M     841.38k

____________________ Page Statistics _____________________
Reads  Writes  Created  Reads/Sec  Writes/Sec  Creates/Sec
   20       0        0       0.00        0.00         0.00

______________________ Insert Buffers ______________________
Inserts  Merged Recs  Merges  Size  Free List Len  Seg. Size
      0            0       0     1              0          2

__________________ Adaptive Hash Index ___________________
Size    Cells Used  Node Heap Bufs  Hash/Sec  Non-Hash/Sec
33.87k                           0      0.00          0.00
InnoDB Row Ops

Here, you will see the output of InnoDB row operations, row operation misc, semaphores, and wait array tables by default.

________________ InnoDB Row Operations _________________
Ins  Upd  Read  Del  Ins/Sec  Upd/Sec  Read/Sec  Del/Sec
  0    0     0    0     0.00     0.00      0.00     0.00

________________________ Row Operation Misc _________________________
Queries Queued  Queries Inside  Rd Views  Main Thread State          
             0               0         1  waiting for server activity

_____________________________ InnoDB Semaphores _____________________________
Waits  Spins  Rounds  RW Waits  RW Spins  Sh Waits  Sh Spins  Signals  ResCnt
    2      0      41         1         1         2         4        5       5

____________________________ InnoDB Wait Array _____________________________
Thread  Time  File  Line  Type  Readers  Lck Var  Waiters  Waiting?  Ending?
Command Summary

The command summary mode displays all the cmd_summary table, which looks similar to the below.

_____________________ Command Summary _____________________
Name                    Value     Pct     Last Incr  Pct   
Com_update              11980303  65.95%          2  33.33%
Com_insert               3409849  18.77%          1  16.67%
Com_delete               2772489  15.26%          0   0.00%
Com_select                   507   0.00%          0   0.00%
Com_admin_commands           411   0.00%          1  16.67%
Com_show_table_status        392   0.00%          0   0.00%
Com_show_status              339   0.00%          2  33.33%
Com_show_engine_status       164   0.00%          0   0.00%
Com_set_option               162   0.00%          0   0.00%
Com_show_tables               92   0.00%          0   0.00%
Com_show_variables            84   0.00%          0   0.00%
Com_show_slave_status         72   0.00%          0   0.00%
Com_show_master_status        47   0.00%          0   0.00%
Com_show_processlist          43   0.00%          0   0.00%
Com_change_db                 27   0.00%          0   0.00%
Com_show_databases            26   0.00%          0   0.00%
Com_show_charsets             24   0.00%          0   0.00%
Com_show_collations           24   0.00%          0   0.00%
Com_alter_table               12   0.00%          0   0.00%
Com_show_fields               12   0.00%          0   0.00%
Com_show_grants               10   0.00%          0   0.00%
Variables & Status

This section calculates statistics, like queries per second, and displays them out in number of different modes.

QPS     Commit_PS     Rlbck_Cmt  Write_Commit     R_W_Ratio      Opens_PS   Tbl_Cch_Usd    Threads_PS  Thrd_Cch_Usd CXN_Used_Ever  CXN_Used_Now
  0             0             0      18163174             0             0             0             0             0          1.99          1.32
  0             0             0      18163180             0             0             0             0             0          1.99          1.32
  0             0             0      18163188             0             0             0             0             0          1.99          1.32
  0             0             0      18163192             0             0             0             0             0          1.99          1.32
  0             0             0      18163217             0             0             0             0             0          1.99          1.32
  0             0             0      18163265             0             0             0             0             0          1.99          1.32
  0             0             0      18163300             0             0             0             0             0          1.99          1.32
  0             0             0      18163309             0             0             0             0             0          1.99          1.32
  0             0             0      18163321             0             0             0             0             0          1.99          1.32
  0             0             0      18163331             0             0             0             0             0          1.99          1.32
Replication Status

In this mode, you will see the output of Slave SQL Status, Slave I/O Status and Master Status. The first two section shows the slave status and slave I/O thread status and the last section shows Master status.

_______________________ Slave SQL Status _______________________
Master        On?  TimeLag  Catchup  Temp  Relay Pos  Last Error
172.16.25.125  Yes    00:00     0.00     0   41295853            

____________________________________ Slave I/O Status _____________________________________
Master        On?  File              Relay Size  Pos       State                           
172.16.25.125  Yes  mysql-bin.000025      39.38M  41295708  Waiting for master to send event

____________ Master Status _____________
File              Position  Binlog Cache
mysql-bin.000010  10887846         0.00%
Non-Interactively

You can run “innotop” in non-interactively.

# innotop --count 5 -d 1 -n
uptime	max_query_time	time_behind_master	connections	locked_count	qps	spark_qps	run	spark_run	open	slave_running	longest_sql
61d			2	0	0.000363908088893752				64	Yes 	
61d			2	0	4.96871146980749	_		_	64	Yes 	
61d			2	0	3.9633543857494	^_		__	64	Yes 	
61d			2	0	3.96701862656428	^__		___	64	Yes 	
61d			2	0	3.96574802684297	^___		____	64	Yes
Monitor Remote Database

To monitor a remote database on a remote system, use the following command using a particular username, password and hostname.

# innotop -u username -p password -h hostname

For more information about ‘innotop‘ usage and options, see the man pages by hitting “man innotop” on a terminal.

Reference Links

Innotop Homepage

Read Also :

  1. Mtop (MySQL Database Monitoring) in RHEL/CentOS/Fedora

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