i was trying to enable slow_query_log. i have downloaded my.cnf file from server using WinSCP and added the code for enabling slow_query_log.
slow_query_log = ON
slow_query_log_file = /var/log/mysql_slow.log
And when i restart my server i am getting this error mysql has failed, please contact the sysadmin (result was "mysql is not running").
here i am adding my my.cnf file
i have tried with slow_query_log = 1 also. But getting the same error. when i remove the code which i have added the error is gone. Any one please help me...
my.cnf
[mysqld]
datadir=/home/mysql/
tmpdir=/home/mysqltmp
#max_connections = 175 #was 175
max_connections = 80
#max_connect_errors = 350 #was 250
max_connect_errors = 250
safe-show-database
skip-locking
key_buffer = 1024M # was 128M
max_allowed_packet = 6M
myisam_sort_buffer_size = 64M
#old settings, for 900 ish max maxconn
#sort_buffer_size = 32M
#read_buffer_size = 32M
#read_rnd_buffer_size = 32M
sort_buffer_size = 5M
read_buffer_size = 5M
read_rnd_buffer_size = 5M
query_cache_size= 1024M
query_cache_limit= 16M
max_heap_table_size = 128M
tmp_table_size = 128M
thread_concurrency = 16
wait_timeout = 10
innodb_file_per_table
innodb_log_file_size = 10485760
open_files_limit = 8192
low_priority_updates = 1
slow_query_log = ON
slow_query_log_file = /var/log/mysql_slow.log
# who set these? these are NOT memory settings, but rather integer settings.
#table_cache = 1024M
#thread_cache_size = 8M
table_cache = 512
thread_cache_size = 8
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
create the file mysql_slow.log in /var/log & change ownerhip of the file:
chown mysql.mysql -R /var/log/mysql_slow.log
either value (1 or ON) should work for the slow query log.
also, are you using regular statements?
check for ownership as mysql.mysql and permissions on file /var/log/mysql_slow.log
ls -al /var/log/mysql_slow.log
Related
I use vertx java to build an app and writing tests for mysql queries. I can successful get results before but after I modified my.cnf because of other stuffs. I cannot no long get returned results but "Fail to read any response from the server, the underlying connection might get lost unexpectedly". I searched google, but I cannot figure out exactly where is wrong and how to fix it.
I would post my.cnf file:
[client]
port = 3306
socket = /tmp/mysql.sock
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[mysqld_safe]
socket = /tmp/mysql.sock
nice = 0
syslog
[mysqld]
# Basic Settings
port = 3306
user = root
pid-file = /usr/local/mysql/data/mysqld.local.pid
socket = /tmp/mysql.sock
port = 3306
basedir = /usr/local/mysql/
datadir = /usr/local/mysql/data
tmpdir = /tmp
lc-messages-dir = /usr/local/mysql/share
skip-external-locking
# Engine
default-storage-engine = InnoDB
# Listening IP
bind-address = 0.0.0.0
# Safety
max-connect-errors = 1000000
max_allowed_packet = 64M
skip-name-resolve
sysdate-is-now = 1
innodb = FORCE
innodb-strict-mode = 1
tls_version = TLSv1,TLSv1.1,TLSv1.2
wait_timeout = 28800
interactive_timeout = 10000
# Buffers
sort_buffer_size = 4M
read_buffer_size = 2M
join_buffer_size = 8M
read_rnd_buffer_size = 16M
# MyISAM
key-buffer-size = 32M
# CACHES AND LIMITS #
tmp-table-size = 128M
max-heap-table-size = 128M
# Bin logs
binlog-format = ROW
log_bin = /tmp/binlog
max_binlog_size = 100M
server-id = 1 # randomize it incase of multiple servers
# InnoDB
innodb-buffer-pool-size = 2048M
innodb_buffer_pool_instances = 8
innodb_log_buffer_size = 8M
innodb-log-files-in-group = 2
innodb-log-file-size = 256M
innodb-file-per-table = 1
innodb-flush-log-at-trx-commit = 1
innodb-flush-method = O_DIRECT
# With virtual synchrony redundancy, make write queries faster
innodb_doublewrite = 1
# LOGGING
general_log_file = /usr/local/mysql/mysql.log
log-error = /usr/local/mysql/data/mysqld.local.err
log-queries-not-using-indexes = 1
[mysqldump]
quick
quote-names
max_allowed_packet = 64M
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
Can you tell me what's wrong with the configuration and what should I change? Thanks
I am using MySQL DB on Windows 2012 R2, x64 with 8 GB RAM. MySQL database many times shows the error - Out of Memory (needed 1048584 bytes). Below are the database Variable values i have set in my.ini file. Is there any change is required in this file?
[mysqld]
port= 3306
socket = "C:/xampp/mysql/mysql.sock"
basedir = "C:/xampp/mysql"
tmpdir = "C:/xampp/tmp"
datadir = "C:/xampp/mysql/data"
pid_file = "mysql.pid"
# enable-named-pipe
key_buffer_size = 16M
max_allowed_packet = 256M
table_cache = 256
net_buffer_length = 1M
read_buffer_size = 512K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
log_error = "mysql_error.log"
# Change here for bind listening
# bind-address="127.0.0.1"
# bind-address = ::1 # for ipv6
max_connect_errors = 500
max_connections = 5000
net_write_timeout = 1800
net_read_timeout = 1800
slow_launch_time = 10
slow_query_log = OFF
thread_cache_size = 2000
back_log = 100
performance_schema = OFF
query_cache_size = 512M
query_cache_limit = 5M
join_buffer_size = 4M
sort_buffer_size = 4M
max_heap_table_size = 64M
tmp_table_size = 128M
table_open_cache = 4500
table_definition_cache=4000
innodb_file_per_table=1
open_files_limit=50000
innodb_data_home_dir = "C:/xampp/mysql/data"
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = "C:/xampp/mysql/data"
#innodb_log_arch_dir = "C:/xampp/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 = 2048M
innodb_buffer_pool_instances = 2
## Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size = 256M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 2
innodb_lock_wait_timeout = 50
innodb_flush_method=O_DIRECT
innodb_io_capacity=1000
innodb_old_blocks_time=1000
innodb_open_files=5000
innodb_sort_buffer_size = 8M
Please reply if someone can manage to get this working again!
Thanks in advance.
Suggestions to consider for your my.ini [mysqld] section
Lead with # (or REMOVE) to allow defaults to serve you
. net_buffer_length
. read_buffer_size
. read_rnd_buffer_size
. MyISAM_sort_buffer_size
. join_buffer_size
. sort_buffer_size
. innodb_sort_buffer_size
max_connections=500 # from 5000 until you have a known need for more connections
thread_cache_size=100 # from 2000 per v8 refman CAP at 100 to avoid OOM
query_cache_type=0 # to avoid QC overhead
query_cache_size=0 # from 512M to conserve RAM for more useful purpose
query_cache_limit=0 # 0 is fine when not using QC
tmp_table_size=64M # from 128M until you can monitor created_tmp_disk_tables
tmp_table_size and max_heap_table_size should always be the same size.
Good luck.
For additional assistance please check my profile, clk Network Profile for contact info.
I am getting this error when I try starting the MySQL service through the XAMPP control panel:
2014-08-17 14:53:44 6028 [ERROR] TCP/IP, --shared-memory, or --named-pipe should be configured on NT OS
2014-08-17 14:53:44 6028 [ERROR] Aborting
Anyone ran into this issue before and have a configuration change that may be used to get it running?
For reference, these are the settings within my.ini:
[client]
port = 3306
socket = "G:/Dev/xampp/mysql/mysql.sock"
# The MySQL server
[mysqld]
port= 3306
socket = "G:/Dev/xampp/mysql/mysql.sock"
basedir = "G:/Dev/xampp/mysql"
tmpdir = "G:/Dev/xampp/tmp"
datadir = "G:/Dev/xampp/mysql/data"
pid_file = "mysql.pid"
# enable-named-pipe
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
log_error = "mysql_error.log"
# SECURITY CHANGES
skip-networking
local-infile=0
plugin_dir = "G:/Dev/xampp/mysql/lib/plugin/"
skip-federated
server-id = 1
innodb_data_home_dir = "G:/Dev/xampp/mysql/data"
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = "G:/Dev/xampp/mysql/data"
innodb_buffer_pool_size = 256M
innodb_additional_mem_pool_size = 2M
innodb_log_file_size = 32M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 2
innodb_lock_wait_timeout = 50
innodb_thread_concurrency = 16
innodb_flush_method = normal
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
[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
Either enable named pipes by removing the comment before the option enable-named-pipe
pid_file = "mysql.pid"
enable-named-pipe # this line
key_buffer = 16M
or let mysql listen on a TCP/IP port by commenting out the option skip-networking:
# SECURITY CHANGES
# skip-networking # this line
If networking is disabled and named pipes are not enabled then mysqld will useless.
With mysql 8 on windows, if you try to start it from command line with skip-grant-tables you will hit this error.
And the solution is adding shared-memory.
.\mysqld --skip-grant-tables --shared-memory
Recently my server CPU has been going very high.
Currently, My my.cnf file such as below:
[mysqld]
default-storage-engine=innodb
local-infile=0
skip-locking
max_connections=300
key_buffer = 128M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 2M
sort_buffer_size = 2M
read_rnd_buffer_size = 2M
table_cache = 1024
record_buffer = 1M
thread_cache_size = 128
wait_timeout = 30
connect_timeout = 10
interactive_timeout = 10
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 16M
max_connect_errors = 10
query_cache_limit = 1M
query_cache_size = 64M
query_cache_type = 1
[isamchk]
key_buffer=64M
sort_buffer=64M
read_buffer=16M
write_buffer=16M
[myisamchk]
key_buffer=64M
sort_buffer=64M
read_buffer=16M
write_buffer=16M
[mysqlhotcopy]
interactive-timeout
CPU Usage: u623.84 s78.87 cu0 cs0 - 8.12% CPU load
MYSQLD: 190%
My server information:
Intel® Pentium® E5400 2.70GHz 2M Cache
HDD: 250GB
RAM: 4GB
Please help me!
Set this variable (which is not in your my.cnf) to 70% of the RAM you have available:
innodb_buffer_pool_size=128M
Of course, if the CPU spikes are due to queries then you want to optimize those with indexes.
Hi my server have 24 cores and 32GB of memory.
Am doing multiple "INSERT INTO SELECT" of 50 millions row at a time.
This takes about 15h a query but it is ticking along at 100% of only one CPU, I'am trying to get mySQL(5.5)(InnoDB) to use more of the resources.
I have read multiple threads about it, but I do not get it to work.
Most info is about adding innodb_thread_concurrency = 0
But I still get no results.
port = 3306
socket = /var/run/mysqld/mysqld.sock
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /media/ssd/db
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
innodb_buffer_pool_size=26G
innodb_thread_concurrency = 0
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 1000M
max_allowed_packet = 160M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
table_cache = 800
query_cache_limit = 5000M
query_cache_size = 1600M
join_buffer_size = 1000M
log_error = /var/log/mysql/error.log
# Here you can see queries with especially long duration
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 2
Try this parameters:
innodb_io_capacity=5000 (or even 20000 depending on your IO subsystem)
innodb_buffer_pool_size=4G (for example)
innodb_log_file_size=1G
innodb_write_io_threads = 64
innodb_read_io_threads = 64
innodb_thread_concurrency = 0