Mysql Cache tuning

For tuning the mysql server you could use the MySQL Tuning Primer Script to tune you cache.

get the script from here.

then run the script with:

./tuning-primer.sh

the result could look like this:

	-- MYSQL PERFORMANCE TUNING PRIMER --
	     - By: Matthew Montgomery -

MySQL Version 5.5.40-0+wheezy1 x86_64

Uptime = 13 days 23 hrs 44 min 21 sec
Avg. qps = 2
Total Questions = 3355704
Threads Connected = 1

Server has been running for over 48hrs.
It should be safe to follow these recommendations

To find out more information on how each of these
runtime variables effects performance visit:
http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html
Visit http://www.mysql.com/products/enterprise/advisors.html
for info about MySQL's Enterprise Monitoring and Advisory Service

SLOW QUERIES
The slow query log is NOT enabled.
Current long_query_time = 10.000000 sec.
You have 0 out of 3355725 that take longer than 10.000000 sec. to complete
Your long_query_time seems to be fine

BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/5.5/en/point-in-time-recovery.html

WORKER THREADS
Current thread_cache_size = 8
Current threads_cached = 7
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine

MAX CONNECTIONS
Current max_connections = 24
Current threads_connected = 1
Historic max_used_connections = 12
The number of used connections is 50% of the configured maximum.
Your max_connections variable seems to be fine.

INNODB STATUS
Current InnoDB index space = 240 K
Current InnoDB data space = 352 K
Current InnoDB buffer pool free = 94 %
Current innodb_buffer_pool_size = 128 M
Depending on how much space your innodb indexes take up it may be safe
to increase this value to up to 2 / 3 of total system memory

MEMORY USAGE
Max Memory Ever Allocated : 2.39 G
Configured Max Per-thread Buffers : 3.38 G
Configured Max Global Buffers : 720 M
Configured Max Memory Limit : 4.09 G
Physical Memory : 7.22 G
Max memory limit seem to be within acceptable norms

KEY BUFFER
Current MyISAM index space = 561 M
Current key_buffer_size = 512 M
Key cache miss rate is 1 : 7
Key buffer free ratio = 64 %
Your key_buffer_size seems to be fine

QUERY CACHE
Query cache is enabled
Current query_cache_size = 64 M
Current query_cache_used = 2 M
Current query_cache_limit = 1 M
Current Query cache Memory fill ratio = 3.27 %
Current query_cache_min_res_unit = 4 K
Your query_cache_size seems to be too high.
Perhaps you can use these resources elsewhere
MySQL won't cache query results that are larger than query_cache_limit in size

SORT OPERATIONS
Current sort_buffer_size = 128 M
Current read_rnd_buffer_size = 256 K
Sort buffer seems to be fine

JOINS
Current join_buffer_size = 132.00 K
You have had 0 queries where a join could not use an index properly
Your joins seem to be using indexes properly

OPEN FILES LIMIT
Current open_files_limit = 1024 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_open_cache = 495 tables
Current table_definition_cache = 400 tables
You have a total of 64 tables
You have 72 open tables.
The table_cache value seems to be fine

TEMP TABLES
Current max_heap_table_size = 32 M
Current tmp_table_size = 32 M
Of 812 temp tables, 13% were created on disk
Created disk tmp tables ratio seems fine

TABLE SCANS
Current read_buffer_size = 16 M
Current table scan ratio = 5 : 1
read_buffer_size is over 8 MB there is probably no need for such a large read_buffer

TABLE LOCKING
Current Lock Wait ratio = 0 : 3355993
Your table locking seems to be fine

and edit your config:

nano /etc/mysql/my.cnf

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