MrMagoo

Member
Sep 6, 2005
17
0
151
Please assist with recommendations for my.cnf - dedicated server performance very slow.

Thanks in advance.

Code:
free -m
             total       used       free     shared    buffers     cached
Mem:          7500       1757       5742          0          0          0
-/+ buffers/cache:       1757       5742
Swap:            0          0          0
Code:
[mysqld]
#skip-grant-tables
local-infile=0
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
skip-locking
skip-innodb
query_cache_limit=64M
query_cache_size=128M
query_cache_type=1
max_user_connections=500
max_connections=1000
interactive_timeout=10
wait_timeout=10
connect_timeout=10
thread_cache_size=128
key_buffer_size=256M
join_buffer_size=512M
max_heap_table_size=256M
tmp_table_size=256M
max_allowed_packet=16M
table_cache=2048
record_buffer=1M
sort_buffer_size=4M
read_buffer_size=4M
max_connect_errors=10
thread_concurrency=8
myisam_sort_buffer_size=64M
server-id=1
bind-address=125.214.73.213
#[mysql.server]
#user=mysql
#basedir=/var/lib 

open_files_limit=7972
[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/lib/mysql/mysql.pid

#[mysqldump]
#quick
max_allowed_packet=16M

[mysql]
no-auto-rehash

[isamchk]
key_buffer=256M
sort_buffer=256M
read_buffer=16M
write_buffer=16M 

[myisamchk]
key_buffer=256M
sort_buffer=256M
read_buffer=16M
write_buffer=16M

[mysqlhotcopy]
interactive-timeout

log-slow-queries=/var/lib/mysql/slow.log
Code:
 >>  MySQLTuner 1.0.1 - Major Hayden <[email protected]>
 >>  Bug reports, feature requests, and downloads at http://mysqltuner.com/
 >>  Run with '--help' for additional options and output filtering

-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.0.96-community
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated -InnoDB -ISAM -NDBCluster 
[--] Data in MyISAM tables: 3G (Tables: 1299)
[!!] Total fragmented tables: 26

-------- Performance Metrics -------------------------------------------------
[--] Up for: 20m 13s (84K q [69.830 qps], 8K conn, TX: 165M, RX: 13M)
[--] Reads / Writes: 72% / 28%
[--] Total buffers: 650.0M global + 520.5M per thread (1000 max threads)
[!!] Maximum possible memory usage: 508.9G (6948% of installed RAM)
[OK] Slow queries: 0% (0/84K)
[OK] Highest usage of available connections: 6% (60/1000)
[OK] Key buffer size / total MyISAM indexes: 256.0M/1.4G
[OK] Key buffer hit rate: 99.9% (9M cached / 5K reads)
[OK] Query cache efficiency: 75.2% (38K cached / 51K selects)
[OK] Query cache prunes per day: 0
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 5K sorts)
[!!] Joins performed without indexes: 1137
[!!] Temporary tables created on disk: 42% (1K on disk / 3K total)
[OK] Thread cache hit rate: 99% (60 created / 8K connections)
[OK] Table cache hit rate: 99% (1K open / 1K opened)
[OK] Open file limit used: 34% (2K/7K)
[!!] Table locks acquired immediately: 94%

-------- Recommendations -----------------------------------------------------
General recommendations:
    Run OPTIMIZE TABLE to defragment tables for better performance
    MySQL started within last 24 hours - recommendations may be inaccurate
    Reduce your overall MySQL memory footprint for system stability
    Enable the slow query log to troubleshoot bad queries
    Adjust your join queries to always utilize indexes
    Temporary table size is already large - reduce result set size
    Reduce your SELECT DISTINCT queries without LIMIT clauses
    Optimize queries and/or use InnoDB to reduce lock wait
Variables to adjust:
  *** MySQL's maximum memory usage is dangerously high ***
  *** Add RAM before increasing MySQL buffer variables ***
    join_buffer_size (> 512.0M, or always use indexes with joins)
 

cPanelMichael

Administrator
Staff member
Apr 11, 2011
47,913
2,202
363
Hello :)

MySQL was only running for 20 minutes when you ran the MySQL tuner script:

Up for: 20m 13s (84K q [69.830 qps], 8K conn, TX: 165M, RX: 13M)
Please let it run for at least 24 hours before running the MySQL tuner script to ensure accurate results.

Thank you.
 

thinkbot

Well-Known Member
Oct 30, 2012
326
1
16
cPanel Access Level
Root Administrator
Ohh, some of your settings are horrible, without any understanding (like join_buffer_size)

Please adjust those:

query_cache_limit=2M
query_cache_size=50M

max_user_connections=100
max_connections=300

key_buffer_size=2000M
join_buffer_size=2M
sort_buffer_size=256K
read_buffer_size=128K

and add slow query tracking (becouse of a lot queries creating temp files on disk)

slow_query_log=1
slow_query_log_file=mysql-slow.log
long_query_time=0.1
log-queries-not-using-indexes

then restart, after a while please run mysqltuner again, and show us here the result
plus,
on slow log, run pt-query-digest

cd /root;
wget http://percona.com/get/pt-query-digest
chmod +x pt-query-digest
./pt-query-digest /var/lib/mysql/mysql-slow.log > slow.txt

and copy slow.txt here, for slow queries review

btw. are you using some CMS with third party plugins, or custom code ?