Fli
03-02-2015, 05:01 PM
March 2nd result of mysql tuning primer Linux shell script on ICPH shared hosting server
KEY BUFFER
Current MyISAM index space = 1.17 G
Current key_buffer_size = 8 M
Key cache miss rate is 1 : 39
Key buffer free ratio = 8 %
You could increase key_buffer_size
It is safe to raise this up to 1/4 of total system memory;
assuming this is a dedicated database server.
QUERY CACHE
Query cache is enabled
Current query_cache_size = 512 M
Current query_cache_used = 422 M
Current query_cache_limit = 512 M
Current Query cache Memory fill ratio = 82.59 %
Current query_cache_min_res_unit = 4 K
However, 5451274 queries have been removed from the query cache due to lack of memory
Perhaps you should raise query_cache_size
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 2 M
Current read_rnd_buffer_size = 256 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 16.00 M
You have had 106037 queries where a join could not use an index properly
You have had 309619 joins without keys that check for key usage after each row
join_buffer_size >= 4 M
This is not advised
You should enable "log-queries-not-using-indexes"
Then look for non indexed joins in the slow query log.
OPEN FILES LIMIT
Current open_files_limit = 43762 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 = 512 tables
Current table_definition_cache = 400 tables
You have a total of 9452 tables
You have 512 open tables.
Current table_cache hit rate is 0%
, while 100% of your table cache is in use
You should probably increase your table_cache
You should probably increase your table_definition_cache value.
TEMP TABLES
Current max_heap_table_size = 1.00 G
Current tmp_table_size = 1.00 G
Of 3694414 temp tables, 35% were created on disk
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 = 128 K
Current table scan ratio = 7045 : 1
You have a high ratio of sequential access requests to SELECTs
You may benefit from raising read_buffer_size and/or improving your use of indexes.
TABLE LOCKING
Current Lock Wait ratio = 1 : 1753
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'
If you have a high concurrency of inserts on Dynamic row-length tables
consider setting 'concurrent_insert=ALWAYS'.
Previous /etc/my.cnf
[mysqld]
max_connections=200
max_user_connections=18
innodb_file_per_table=1
local-infile=0
max_allowed_packet=268435456
open_files_limit=43762
ft_min_word_len=3
thread_cache_size=12
max_connections=200
innodb_buffer_pool_size=400M
join_buffer_size=16M
query_cache_size=512M
query_cache_limit=512M
table_cache=6024
table_open_cache=512
max_heap_table_size=1024M
[myisamchk]
ft_min_word_len=3
I modiffied like this:
[mysqld]
max_connections=200
max_user_connections=18
innodb_file_per_table=1
local-infile=0
max_allowed_packet=268435456
open_files_limit=43762
ft_min_word_len=3
# was not there, was default 8M
key_buffer_size=1024
thread_cache_size=12
max_connections=200
innodb_buffer_pool_size=400M
join_buffer_size=16M
#was not there, was default 128k
read_buffer_size=16M
# was 512M
query_cache_size=768M
query_cache_limit=768M
table_cache=6024
table_open_cache=512
tmp_table_size=1024M
max_heap_table_size=1024M
[myisamchk]
ft_min_word_len=3
and restarted mysql
The PHPMyAdmin Server variables: http://i.snag.gy/DVtKC.jpg
KEY BUFFER
Current MyISAM index space = 1.17 G
Current key_buffer_size = 8 M
Key cache miss rate is 1 : 39
Key buffer free ratio = 8 %
You could increase key_buffer_size
It is safe to raise this up to 1/4 of total system memory;
assuming this is a dedicated database server.
QUERY CACHE
Query cache is enabled
Current query_cache_size = 512 M
Current query_cache_used = 422 M
Current query_cache_limit = 512 M
Current Query cache Memory fill ratio = 82.59 %
Current query_cache_min_res_unit = 4 K
However, 5451274 queries have been removed from the query cache due to lack of memory
Perhaps you should raise query_cache_size
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 2 M
Current read_rnd_buffer_size = 256 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 16.00 M
You have had 106037 queries where a join could not use an index properly
You have had 309619 joins without keys that check for key usage after each row
join_buffer_size >= 4 M
This is not advised
You should enable "log-queries-not-using-indexes"
Then look for non indexed joins in the slow query log.
OPEN FILES LIMIT
Current open_files_limit = 43762 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 = 512 tables
Current table_definition_cache = 400 tables
You have a total of 9452 tables
You have 512 open tables.
Current table_cache hit rate is 0%
, while 100% of your table cache is in use
You should probably increase your table_cache
You should probably increase your table_definition_cache value.
TEMP TABLES
Current max_heap_table_size = 1.00 G
Current tmp_table_size = 1.00 G
Of 3694414 temp tables, 35% were created on disk
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 = 128 K
Current table scan ratio = 7045 : 1
You have a high ratio of sequential access requests to SELECTs
You may benefit from raising read_buffer_size and/or improving your use of indexes.
TABLE LOCKING
Current Lock Wait ratio = 1 : 1753
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'
If you have a high concurrency of inserts on Dynamic row-length tables
consider setting 'concurrent_insert=ALWAYS'.
Previous /etc/my.cnf
[mysqld]
max_connections=200
max_user_connections=18
innodb_file_per_table=1
local-infile=0
max_allowed_packet=268435456
open_files_limit=43762
ft_min_word_len=3
thread_cache_size=12
max_connections=200
innodb_buffer_pool_size=400M
join_buffer_size=16M
query_cache_size=512M
query_cache_limit=512M
table_cache=6024
table_open_cache=512
max_heap_table_size=1024M
[myisamchk]
ft_min_word_len=3
I modiffied like this:
[mysqld]
max_connections=200
max_user_connections=18
innodb_file_per_table=1
local-infile=0
max_allowed_packet=268435456
open_files_limit=43762
ft_min_word_len=3
# was not there, was default 8M
key_buffer_size=1024
thread_cache_size=12
max_connections=200
innodb_buffer_pool_size=400M
join_buffer_size=16M
#was not there, was default 128k
read_buffer_size=16M
# was 512M
query_cache_size=768M
query_cache_limit=768M
table_cache=6024
table_open_cache=512
tmp_table_size=1024M
max_heap_table_size=1024M
[myisamchk]
ft_min_word_len=3
and restarted mysql
The PHPMyAdmin Server variables: http://i.snag.gy/DVtKC.jpg