I have got a cPanel/WHM VPS with 768MB of RAM and am running MySQL 5.0.67-community
Can someone tell my what to put in it, or give me some tips on how to optimize MySQL
This is what I have in /etc/my.cnf right now:
Code:
[mysqld]
skip-bdb
skip-innodb
we've currently got a 2 server setup, apache+mysql
Mysql server is a Xeon 3.2Ghz with 2Gb ram, scsi 73gb raid1 disks
Server has been running a while, steadily increasing in traffic. whilst 90% of the time it's running ok (load around 0.5 - 1.0, cpu around 25-50% busy mainly mysql, disk i/o around 3% busy) during heavy traffic times everything slows right down
At the moment the mysql box is only running mysql so we've allocated about 1.5gb out of the 2gb to mysql.
At present, when we get busy the apache server is queing up requests as it waits for the mysql server. Query log shows most queries are <1sec, any other's are being optimised but due to the nature of our website there are a few pesky queries (only occasionally being slow though).
question is, can this config be tuned any more or is it time for an upgrade - mainly ram to add more innodb buffers?
Here's the result of tuning-primer.sh
Code:
SLOW QUERIES
The slow query log is enabled.
Current long_query_time = 2 sec.
You have 9 out of 159346 that take longer than 2 sec. to complete
Your long_query_time seems to be fine
BINARY UPDATE LOG
The binary update log is enabled
The expire_logs_days is not set.
The mysqld will retain the entire binary log until RESET MASTER or PURGE MASTER LOGS commands are run manually
Setting expire_log_days will allow you to remove old binary logs automatically
See http://dev.mysql.com/doc/refman/4.1/en/purge-master-logs.html
WORKER THREADS
Current thread_cache_size = 384
Current threads_cached = 15
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 150
Current threads_connected = 4
Historic max_used_connections = 18
The number of used connections is 12% of the configured maximum.
Your max_connections variable seems to be fine.
MEMORY USAGE
Max Memory Ever Allocated : 1 G
Configured Max Per-thread Buffers : 5 G
Configured Max Global Buffers : 803 M
Configured Max Memory Limit : 6 G
Physical Memory : 1.99 G
Max memory limit exceeds 90% of physical memory
KEY BUFFER
Current MyISAM index space = 82 K
Current key_buffer_size = 5 M
Key cache miss rate is 1 : 1862
Key buffer fill ratio = 100.00 %
Your key_buffer_size seems to be fine
QUERY CACHE
Query cache is supported but not enabled
Perhaps you should set the query_cache_size
SORT OPERATIONS
Current sort_buffer_size = 16 M
Current read_rnd_buffer_size = 7 M
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 4.00 M
You have had 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly
join_buffer_size >= 4 M
This is not advised
OPEN FILES LIMIT
Current open_files_limit = 11095 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_cache value = 5467 tables
You have a total of 732 tables
You have 155 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 255 M
Current tmp_table_size = 256 M
Of 21109 temp tables, 35% were created on disk
Effective in-memory tmp_table_size is limited to max_heap_table_size.
Perhaps you should increase your tmp_table_size and/or max_heap_table_size
to reduce the number of disk-based temporary tables
Note! BLOB and TEXT columns are not allow in memory tables.
If you are using these columns raising these values might not impact your
ratio of on disk temp tables.
TABLE SCANS
Current read_buffer_size = 7 M
Current table scan ratio = 929 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 117
You may benefit from selective use of InnoDB.
If you have long running SELECT's against MyISAM tables and perform
frequent updates consider setting 'low_priority_updates=1'
Server is mainly Innodb due to previous row-locking issues.
in Optimizing mysql Why because i am facing the high server load because of the mysql often
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Server Specs: Dual Core Intel Pentium 3Ghz, 4GB RAM, 500Gb hard disk
Below is my current my.cnf file:
Code:
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1
max_allowed_packet=16M
skip-innodb
skip-bdb
[mysql.server]
user=mysql
basedir=/var/lib
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid
I've looked through the mySQL documentation but there is no substitute for experience when it comes to these things.
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mysqlcheck -o -u...
Like what it does to "optimize" them? Does it really help?
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I can't truely link to it, because I have less than five posts, but here is a quote of that thread, so you can hit the button in the quote to go there:
Quote:
Originally Posted by tnedator
I am leaning towards one of these three VPS accounts that all cost roughly the same:
Today i need to run "OPTIMIZE TABLE" from MySQLTuner recommendation.
Now i don't know how to run it ? I try to put in SQL Query via phpmyadmin and:
SQL query:
OPTIMIZE TABLE
MySQL said:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
i have two servers behind certain switch,
the two servers are with low load,
but the one is good response,and another one is slow,
i try to restart the httpd,the problem is here still,
are there any method that i can optimize the httpd and check out why it is ?
they all run with whm/cpanel
I have purchased "Due2Core" with 4GB Ram. i have one problem. i hope someone help me in this matter.
I have hosted only 4 or 5 websites on dedicated. mostly maximum 8000 users visit my website. Maximum B/W usage is 35GB.
Daily 25 or 30 mints my websites "WebPages open speed slow". Some time problem occur for 1 time or 2 times. when i checked my server status report Load only 0.50% and Memory usage 35% only.
when i checked server and my sql usage report maximum http load come from my top visit websites.
some friend suggest me for optimize your dedicated apache. because some thing wrong in your apache.
because i have enough memory.
Anybody suggest me suitable apache Optimization method. with step by step.
Remember, in this time my server run default sitting.
I've been a long time follower of wht.com from reading the hosting reviews to optimizations, and now it's come to that point that I need to post a question to get more accurate help than reading others configurations since all servers and sites have their needs. So here it goes.
Server specs:
Ubuntu dapper
Apache 2.2.4
PHP 5.2.3 - eaccelerator 0.9.5.1
mysql 5.0.22
2.6.15-28-server #1 SMP i686 GNU/Linux
cpu: Intel Xeon-Clovertown 5320-QuadCore 1.86GHz
ram: 2x2GB
As I wrote in the topic my main concern is my apache config. I've tried many many different configs but I'm never sure when to stop optimizing it.
The site is a chat community (myspace like site) with over 1000-2000 simultaneous users online that do everything from posting images, to talk in the forums. And yes I host everything on the same server atm.
My worry is that at night when the site has the most visitors the amount of processes that get produced get 'cut' as it seems to reach a limit somewhere. Below is an image of cacti with load and processes. Please ignore the load peaks as they are nothing then my average 'testing' periods of new functions
[url]
This seems to be run by my Max/MinSpareServers which I've played around with but as I said never could find a perfect spot. The amount of processes have always been controled by these values, before I increased them a couple of days ago the amount was around 600 processes to the max. Now as you can see on the latest graph it's around 800.
I've tried the default values but the site went to slow with those values. I've lately come up to what I think is insane values but it keeps the server ticking in a nice pace.
So I'm asking you guys for help as I've reached my trial and error sessions. I have no clue what 'ok' values are for amount of current processes running, and I don't' feel confident to increase the values.
here is my apache config.
Timeout 60
KeepAlive On
MaxKeepAliveRequests 3500
KeepAliveTimeout 2
StartServers 190
MinSpareServers 170
MaxSpareServers 230
ServerLimit 700
MaxClients 700
MaxRequestsPerChild 6000
My server: Opteron 165 + 2GB RAM, running CentOS
I have noticed that if I enable KeepAlive, the performance is much more better. However, Apache will be frozen few times a day without any reason. So, I need to turn off KeepAlive. Is there any idea why and how to fix? This is the configuration
Timeout 300
KeepAlive On
MaxKeepAliveRequests 10
KeepAliveTimeout 2
MinSpareServers 10
MaxSpareServers 25
StartServers 15
MaxClients 250
MaxRequestsPerChild 10
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best optimized values for my server. My server oftenly goes down due to large number of http processes.
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Since my /var partition is full, so I moved /var/lib/mysql to /backup/mysql/.
Seems all the files are copied and I changed my.cnf reboot mysql, but all the web sites using db is not working anymore..
Server :
Code:
Intel C2Q Q9450
8196 MB DDR2 RAM
500 GB 7.200RPM
2000GB Transfer p/m
OS: CentOS 5.2
Code:
running a ipb forum site 2.3.4
current stats :
Our members have made a total of 245,827 posts
We have 14,673 registered members
Total number of topics is 75099
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