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Major MySQL problems
Posted by: Paul Coulter
Date: February 10, 2010 04:26AM


Please be gentle with me, I am only starting out in the mindfield which is MySQL. Over the past few days the services we are providing with a MySQL backend have been pretty much unusable at certain times of the day. I did some investigation and realised the MySQLd process is hogging up to 99.9% of processing power on the server once or twice per day, almost always around the same time. Hanging our web front end making it practically unusable.

I assume we need to perform some kind of optimisation but I am at a loss as to where to start. I have included my server variables in case there is anything glaryingly obvious.

Many thanks,


auto increment increment 1
auto increment offset 1
automatic sp privileges ON
back log 50
basedir /usr/
bdb cache size 8,388,600
bdb home /var/lib/mysql/
bdb log buffer size 1,024,000
bdb logdir
bdb max lock 10,000
bdb shared data OFF
bdb tmpdir /tmp/
binlog cache size 32,768
bulk insert buffer size 8,388,608
character set client utf8
(Global value) latin1
character set connection utf8
(Global value) latin1
character set database latin1
character set filesystem binary
character set results utf8
(Global value) latin1
character set server latin1
character set system utf8
character sets dir /usr/share/mysql/charsets/
collation connection utf8_unicode_ci
(Global value) latin1_swedish_ci
collation database latin1_swedish_ci
collation server latin1_swedish_ci
completion type 0
concurrent insert 1
connect timeout 5
datadir /var/lib/mysql/
date format %Y-%m-%d
datetime format %Y-%m-%d %H:%i:%s
default week format 0
delay key write ON
delayed insert limit 100
delayed insert timeout 300
delayed queue size 1,000
div precision increment 4
engine condition pushdown OFF
expire logs days 0
flush OFF
flush time 0
ft boolean syntax + -><()~*:""&|
ft max word len 84
ft min word len 4
ft query expansion limit 20
ft stopword file (built-in)
group concat max len 1,024
have archive NO
have bdb YES
have blackhole engine NO
have compress YES
have crypt YES
have csv NO
have dynamic loading YES
have example engine NO
have federated engine NO
have geometry YES
have innodb DISABLED
have isam NO
have merge engine YES
have ndbcluster NO
have openssl DISABLED
have ssl DISABLED
have query cache YES
have raid NO
have rtree keys YES
have symlink YES
hostname kccmvledb01
init connect
init file
init slave
innodb additional mem pool size 33,554,432
innodb autoextend increment 8
innodb buffer pool awe mem mb 0
innodb buffer pool size 1,073,741,824
innodb checksums ON
innodb commit concurrency 0
innodb concurrency tickets 500
innodb data file path ibdata1:2048M;ibdata2:2048M:autoextend
innodb data home dir /var/lib/mysql/innodb
innodb doublewrite ON
innodb fast shutdown 1
innodb file io threads 4
innodb file per table OFF
innodb flush log at trx commit 1
innodb flush method
innodb force recovery 0
innodb lock wait timeout 50
innodb locks unsafe for binlog OFF
innodb log arch dir /var/log/mysql/innodb
innodb log archive OFF
innodb log buffer size 16,777,216
innodb log file size 268,435,456
innodb log files in group 3
innodb log group home dir /var/log/mysql/innodb
innodb max dirty pages pct 90
innodb max purge lag 0
innodb mirrored log groups 1
innodb open files 300
innodb rollback on timeout OFF
innodb support xa ON
innodb sync spin loops 20
innodb table locks ON
innodb thread concurrency 8
innodb thread sleep delay 10,000
interactive timeout 28,800
join buffer size 131,072
key buffer size 536,870,912
key cache age threshold 300
key cache block size 1,024
key cache division limit 100
language /usr/share/mysql/english/
large files support ON
large page size 0
large pages OFF
lc time names en_US
license GPL
local infile ON
locked in memory OFF
log OFF
log bin OFF
log bin trust function creators OFF
log error /var/log/mysql/mysqld.error.log
log queries not using indexes OFF
log slave updates OFF
log slow queries ON
log warnings 0
long query time 10
low priority updates OFF
lower case file system OFF
lower case table names 0
max allowed packet 16,776,192
max binlog cache size 4,294,967,295
max binlog size 1,073,741,824
max connect errors 1,000
max connections 400
max delayed threads 20
max error count 64
max heap table size 67,108,864
max insert delayed threads 20
max join size 4,294,967,295
max length for sort data 1,024
max prepared stmt count 16,382
max relay log size 0
max seeks for key 4,294,967,295
max sort length 1,024
max sp recursion depth 0
max tmp tables 64
max user connections 0
max write lock count 4,294,967,295
multi range count 256
myisam data pointer size 6
myisam max sort file size 2,147,483,647
myisam recover options OFF
myisam repair threads 1
myisam sort buffer size 402,653,184
myisam stats method nulls_unequal
net buffer length 16,384
net read timeout 30
net retry count 10
net write timeout 30
new OFF
old passwords ON
open files limit 8,192
optimizer prune level 1
optimizer search depth 62
pid file /var/run/mysqld/
port 3,306
preload buffer size 32,768
profiling OFF
profiling history size 15
protocol version 10
query alloc block size 8,192
query cache limit 2,097,152
query cache min res unit 4,096
query cache size 268,435,456
query cache type ON
query cache wlock invalidate OFF
query prealloc size 8,192
range alloc block size 2,048
read buffer size 1,044,480
read only OFF
read rnd buffer size 262,144
relay log purge ON
relay log space limit 0
rpl recovery rank 0
secure auth OFF
secure file priv
server id 1
skip external locking ON
skip networking OFF
skip show database OFF
slave compressed protocol OFF
slave load tmpdir /tmp/
slave net timeout 3,600
slave skip errors OFF
slave transaction retries 10
slow launch time 2
socket /var/lib/mysql/mysql.sock
sort buffer size 1,048,568
sql big selects ON
sql mode
sql notes ON
sql warnings OFF
ssl ca
ssl capath
ssl cert
ssl cipher
ssl key
storage engine MyISAM
sync binlog 0
sync frm ON
system time zone GMT
table cache 2,000
table lock wait timeout 50
table type MyISAM
thread cache size 32
thread stack 196,608
time format %H:%i:%s
time zone SYSTEM
timed mutexes OFF
tmp table size 67,108,864
tmpdir /tmp/
transaction alloc block size 8,192
transaction prealloc size 4,096
tx isolation REPEATABLE-READ
updatable views with limit YES
version 5.0.45-log
version bdb Sleepycat Software: Berkeley DB 4.1.24: (July 4, 2007)
version comment Source distribution
version compile machine i686
version compile os redhat-linux-gnu
wait timeout 30

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Written By
Major MySQL problems
February 10, 2010 04:26AM
February 11, 2010 10:45PM
February 12, 2010 07:17AM
February 12, 2010 11:04AM

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