I have a WordPress site on a MediaTemple DV4 server with 8GB RAM. The DB has over 35K posts and at peak hours, the site has between 300 and 400 concurrent users. The homepage runs 6 queries to the wp_posts table.
Could anyone offer any advice on the best settings for the my.cnf file? Thanks.
query-cache-type = 1
query-cache-size = 256M
query_cache_limit = 1M
thread_cache_size = 256
max_connections = 350
tmp_table_size=256M
max_heap_table_size=256M
table_cache= 1024
join_buffer_size = 5M
key_buffer_size = 512M
wait_timeout = 60
local-infile=0
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
MySQLTuner Performance Metrics:
-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 963M (Tables: 504)
[--] Data in InnoDB tables: 4M (Tables: 198)
[!!] Total fragmented tables: 218
[--] Up for: 2d 18h 10m 22s (27M q [113.837 qps], 1M conn, TX: 489B, RX: 4B)
[--] Reads / Writes: 97% / 3%
[--] Total buffers: 1.4G global + 7.6M per thread (350 max threads)
[OK] Maximum possible memory usage: 4.0G (42% of installed RAM)
[OK] Slow queries: 0% (3K/27M)
[!!] Highest connection usage: 86% (301/350)
[OK] Key buffer size / total MyISAM indexes: 128.0M/679.6M
[OK] Key buffer hit rate: 100.0% (1B cached / 57K reads)
[OK] Query cache efficiency: 67.8% (14M cached / 20M selects)
[!!] Query cache prunes per day: 29253
[OK] Sorts requiring temporary tables: 0% (1K temp sorts / 1M sorts)
[!!] Temporary tables created on disk: 35% (688K on disk / 1M total)
[OK] Thread cache hit rate: 99% (463 created / 1M connections)
[OK] Table cache hit rate: 31% (1K open / 3K opened)
[OK] Open file limit used: 42% (1K/2K)
[OK] Table locks acquired immediately: 99% (7M immediate / 7M locks)
[OK] InnoDB data size / buffer pool: 4.3M/32.0M
May be you can check the size of the queries, it’s possible that 1M is too big and smaller – but frequently running – queries won’t be cached.
pt-query-digest is an excellent tool for doing that:
http://www.percona.com/doc/percona-toolkit/2.1/pt-query-digest.html
For general tips, you can use:
http://mysqltuner.pl
keep it in mind, that they’re just generic advices, so don’t follow them blindfolded, but usually the script’s output is a good start when optimizing MySql.
key_buffer_size is only relevant of you’re using MyISAM tables (don’t!).
If you want the database to run smoothly with InnoDB then raise the
innodb_buffer_pool_size to higher than the actual database size(if it’s possible)