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enable mysql slow log

Posted on 2014-03-23
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Last Modified: 2014-03-23
using wamp windows7 how can I enable mysql slow log

I want to see a history of all new queries.
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Question by:rgb192
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8 Comments
 
LVL 25

Expert Comment

by:Tomas Helgi Johannsson
ID: 39948786
Hi!

Locate the my.ini or my.cnf file, open it in Notepad and add the following
in the [mysqld] section

log-slow-queries = [path to the log file]

then restart the mysql service.
See further here
http://dev.mysql.com/doc/refman/5.5/en/slow-query-log.html

Regards,
    Tomas Helgi
0
 

Author Comment

by:rgb192
ID: 39948809
log-slow-queries = [path to the log file]

is-this-path-to-log-file
the mysql I am using is mysql5.6.12

whilch file should I edit
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LVL 25

Expert Comment

by:Tomas Helgi Johannsson
ID: 39948857
Hi!

Edit the my.ini under the mysql5.6.12 directory.
It seems that the slow query log is enabled for the 5.6.12 and it is writing to a table.
You should see in the my.ini file something like
log-output = TABLE
as well as
slow-query-log = 1
http://dev.mysql.com/doc/refman/5.6/en/log-destinations.html

This table can be accessed in the mysql database.
in the mysql command issue
use mysql;
describe slow_log;
select * from slow_log;

Regards,
    Tomas Helgi
0
 

Author Comment

by:rgb192
ID: 39948938
I made no changes: is this correct?
 my.ini
# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#
# You can copy this file to
# /etc/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is C:\mysql\data) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
#password	= your_password
port		= 3306
socket		= /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[wampmysqld]
port		= 3306
socket		= /tmp/mysql.sock
key_buffer = 16M
max_allowed_packet = 1M

sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
basedir=c:/wamp/bin/mysql/mysql5.6.12
log-error=c:/wamp/logs/mysql.log
datadir=c:/wamp/bin/mysql/mysql5.6.12/data

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
# 
#skip-networking

# Disable Federated by default
skip-federated

# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysql-bin

# binary logging format - mixed recommended
binlog_format=mixed

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id	= 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Point the following paths to different dedicated disks
#tmpdir		= /tmp/		
#log-update 	= /path-to-dedicated-directory/hostname

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = C:\mysql\data/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = C:\mysql\data/
#innodb_log_arch_dir = C:\mysql\data/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout

[mysqld]
port=3306

Open in new window






use mysql;

describe slow_log;
output

select * from slow_log;
no output
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LVL 25

Expert Comment

by:Tomas Helgi Johannsson
ID: 39948964
Hi!

In line 164 (in the [mysqld] section)
add
slow_query_log=1
log-output = TABLE

you can also have the FILE attribute and then set the logfile
log-output = TABLE, FILE
slow_query_log_file=<path and name of the file you want it to be logged to >

Save the my.ini and
restart the mysqlservice.

You should then see the slow_log table in the mysql database as I described earlier.

Regards,
    Tomas Helgi
0
 

Author Comment

by:rgb192
ID: 39949135
[mysqld]
port=3306
slow_query_log=1
log-output = TABLE,FILE
slow_query_log_file=C:\wamp\bin\mysql\mysql5.6.12\data\mysql\slow_query_log_file.txt

after restart of wamp

no append to new file
and
select * from slow_log;
no output
0
 
LVL 25

Accepted Solution

by:
Tomas Helgi Johannsson earned 500 total points
ID: 39949180
Hi!

All queries that takes longer than 10 seconds (by default) are logged.
You can modify that by adding the
long_query_time=<number of seconds>
to the my.ini file
see more
http://dev.mysql.com/doc/refman/5.6/en/server-system-variables.html#sysvar_long_query_time

Regards,
    Tomas Helgi
0
 

Author Closing Comment

by:rgb192
ID: 39949361
[mysqld]
port=3306
slow_query_log=1
log-output = TABLE,FILE
slow_query_log_file=C:\wamp\bin\mysql\mysql5.6.12\data\mysql\slow_query_log_file.txt
long_query_time=0



now I am getting queries from mysql workbench


thanks
0

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