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MYsql-performance-monitoring-debugging


mysql performance monitorng

Debug any performance issue and identify the query that is causing problems, by running the command automatically every 1 second as shown below.

mysqladmin -u root -pubuntu -i 1 processlist

!!KILL Syntax

KILL [CONNECTION | QUERY] thread_id

Each connection to mysqld runs in a separate thread. 
You can see which threads are running with the SHOW PROCESSLIST statement and kill a thread with the KILL thread_id statement. 

You can also use the mysqladmin processlist and mysqladmin kill commands to examine and kill threads. 

Here is an example of SHOW PROCESSLIST output:

mysql> SHOW FULL PROCESSLIST\G


What is the current status of MySQL server?

# mysqladmin -u root -ptmppassword status

ubuntu@server3:~$ mysqladmin -uroot -pubuntu proc stat
+----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host      | db | Command | Time | State | Info             |
+----+------+-----------+----+---------+------+-------+------------------+
| 43 | root | localhost |    | Query   | 0    |       | show processlist |
+----+------+-----------+----+---------+------+-------+------------------+
Uptime: 1071  Threads: 1  Questions: 327  Slow queries: 0  Opens: 264  Flush tables: 1  Open tables: 23  Queries per second avg: 0.305
ubuntu@server3:~$ mysqladmin -uroot -pubuntu processlist
+----+------+-----------+----+---------+------+-------+------------------+
| Id | User | Host      | db | Command | Time | State | Info             |
+----+------+-----------+----+---------+------+-------+------------------+
| 44 | root | localhost |    | Query   | 0    |       | show processlist |
+----+------+-----------+----+---------+------+-------+------------------+
ubuntu@server3:~$ mysqladmin -uroot -pubuntu status
Uptime: 1090  Threads: 1  Questions: 330  Slow queries: 0  Opens: 264  Flush tables: 1  Open tables: 23  Queries per second avg: 0.302
ubuntu@server3:~$


ubuntu@server3:~$ mysqladmin --help
mysqladmin  Ver 8.42 Distrib 5.1.63, for debian-linux-gnu on x86_64
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Administration program for the mysqld daemon.
Usage: mysqladmin [OPTIONS] command command....
  -c, --count=#       Number of iterations to make. This works with -i
                      (--sleep) only.
  --debug-check       Check memory and open file usage at exit.
  --debug-info        Print some debug info at exit.
  -f, --force         Don't ask for confirmation on drop database; with
                      multiple commands, continue even if an error occurs.
  -C, --compress      Use compression in server/client protocol.
  --character-sets-dir=name 
                      Directory for character set files.
  --default-character-set=name 
                      Set the default character set.
  -?, --help          Display this help and exit.
  -h, --host=name     Connect to host.
  -b, --no-beep       Turn off beep on error.
  -p, --password[=name] 
                      Password to use when connecting to server. If password is
                      not given it's asked from the tty.
  -P, --port=#        Port number to use for connection or 0 for default to, in
                      order of preference, my.cnf, $MYSQL_TCP_PORT,
                      /etc/services, built-in default (3306).
  --protocol=name     The protocol to use for connection (tcp, socket, pipe,
                      memory).
  -r, --relative      Show difference between current and previous values when
                      used with -i. Currently only works with extended-status.
  -O, --set-variable=name 
                      Change the value of a variable. Please note that this
                      option is deprecated; you can set variables directly with
                      --variable-name=value.
  -s, --silent        Silently exit if one can't connect to server.
  -S, --socket=name   The socket file to use for connection.
  -i, --sleep=#       Execute commands repeatedly with a sleep between.
  --ssl               Enable SSL for connection (automatically enabled with
                      other flags).Disable with --skip-ssl.
  --ssl-ca=name       CA file in PEM format (check OpenSSL docs, implies
                      --ssl).
  --ssl-capath=name   CA directory (check OpenSSL docs, implies --ssl).
  --ssl-cert=name     X509 cert in PEM format (implies --ssl).
  --ssl-cipher=name   SSL cipher to use (implies --ssl).
  --ssl-key=name      X509 key in PEM format (implies --ssl).
  --ssl-verify-server-cert 
                      Verify server's "Common Name" in its cert against
                      hostname used when connecting. This option is disabled by
                      default.
  -u, --user=name     User for login if not current user.
  -v, --verbose       	  Write more information.
  -V, --version         Output version information and exit.
  -E, --vertical         Print output vertically. Is similar to --relative, but
                      	prints output vertically.
  -w, --wait[=#]      Wait and retry if connection is down.
  --connect_timeout=# 
  --shutdown_timeout=# 

Variables (--variable-name=value)
and boolean options {FALSE|TRUE}  Value (after reading options)
--------------------------------- -----------------------------
count                             0
debug-check                       FALSE
debug-info                        FALSE
force                             FALSE
compress                          FALSE
character-sets-dir                (No default value)
default-character-set             (No default value)
host                              (No default value)
no-beep                           FALSE
port                              3306
relative                          FALSE
socket                            /var/run/mysqld/mysqld.sock
sleep                             0
ssl                               FALSE
ssl-ca                            (No default value)
ssl-capath                        (No default value)
ssl-cert                          (No default value)
ssl-cipher                        (No default value)
ssl-key                           (No default value)
ssl-verify-server-cert            FALSE
user                              (No default value)
verbose                           FALSE
vertical                          FALSE
connect_timeout                   43200
shutdown_timeout                  3600

Default options are read from the following files in the given order:
/etc/my.cnf /etc/mysql/my.cnf /usr/etc/my.cnf ~/.my.cnf 

The following groups are read: mysqladmin client
The following options may be given as the first argument:
--print-defaults        Print the program argument list and exit.
--no-defaults           Don't read default options from any option file.
--defaults-file=#       Only read default options from the given file #.
--defaults-extra-file=# Read this file after the global files are read.

Where command is a one or more of: (Commands may be shortened)
  create databasename	Create a new database
  debug			Instruct server to write debug information to log
  drop databasename	Delete a database and all its tables
  extended-status       	Gives an extended status message from the server
  flush-hosts           	Flush all cached hosts
  flush-logs            		Flush all logs
  flush-status		Clear status variables
  flush-tables          	Flush all tables
  flush-threads         	Flush the thread cache
  flush-privileges      	Reload grant tables (same as reload)
  kill id,id,...		Kill mysql threads
  password new-password Change old password to new-password, MySQL 4.1 hashing.
  old-password new-password Change old password to new-password in old format.

  ping		Check if mysqld is alive
  processlist	Show list of active threads in server
  reload		Reload grant tables
  refresh		Flush all tables and close and open logfiles
  shutdown	Take server down
  status		Gives a short status message from the server
  start-slave	Start slave
  stop-slave	Stop slave
  variables             Prints variables available
  version		Get version info from server

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Page last modified on August 07, 2012, at 08:18 AM