high number of aborted connection

[kaplan]

Hi,
The number of aborted connections has become very high.
I think i have a big problem with my.cnf

could you help me?
thank's a lot...

mysqltuner result :

-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.5.30-log
[OK] Operating on 64-bit architecture

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
[--] Data in MyISAM tables: 681M (Tables: 922)
[--] Data in InnoDB tables: 55M (Tables: 489)
[--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17)
[!!] Total fragmented tables: 514

-------- Security Recommendations  -------------------------------------------
[OK] All database users have passwords assigned

-------- Performance Metrics -------------------------------------------------
[--] Up for: 1d 3h 26m 19s (2M q [20.290 qps], 1M conn, TX: 2B, RX: 452M)
[--] Reads / Writes: 85% / 15%
[--] Total buffers: 8.6G global + 14.5M per thread (500 max threads)
[OK] Maximum possible memory usage: 15.7G (66% of installed RAM)
[OK] Slow queries: 0% (1/2M)
[OK] Highest usage of available connections: 13% (65/500)
[OK] Key buffer size / total MyISAM indexes: 8.0G/318.3M
[OK] Key buffer hit rate: 100.0% (3B cached / 267K reads)
[!!] Query cache efficiency: 17.6% (245K cached / 1M selects)
[!!] Query cache prunes per day: 67418
[OK] Sorts requiring temporary tables: 0% (35 temp sorts / 764K sorts)
[!!] Temporary tables created on disk: 39% (450K on disk / 1M total)
[OK] Thread cache hit rate: 99% (68 created / 1M connections)
[OK] Table cache hit rate: 42% (2K open / 4K opened)
[OK] Open file limit used: 18% (2K/12K)
[OK] Table locks acquired immediately: 99% (2M immediate / 2M locks)
[!!] Connections aborted: 92%
[!!] InnoDB data size / buffer pool: 55.3M/8.0M

-------- Recommendations -----------------------------------------------------
General recommendations:
    Run OPTIMIZE TABLE to defragment tables for better performance
    Temporary table size is already large - reduce result set size
    Reduce your SELECT DISTINCT queries without LIMIT clauses
    Your applications are not closing MySQL connections properly
Variables to adjust:
    query_cache_limit (> 148M, or use smaller result sets)
    query_cache_size (> 128M)
    innodb_buffer_pool_size (>= 55M)

result tuning-primer

SLOW QUERIES
The slow query log is enabled.
Current long_query_time = 3.000000 sec.
You have 1 out of 2011708 that take longer than 3.000000 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 = 16384
Current threads_cached = 67
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine

MAX CONNECTIONS
Current max_connections = 500
Current threads_connected = 1
Historic max_used_connections = 65
The number of used connections is 13% of the configured maximum.
Your max_connections variable seems to be fine.

INNODB STATUS
Current InnoDB index space = 43 M
Current InnoDB data space = 55 M
Current InnoDB buffer pool free = 0 %
Current innodb_buffer_pool_size = 8 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 : 9.06 G
Configured Max Per-thread Buffers : 7.08 G
Configured Max Global Buffers : 8.14 G
Configured Max Memory Limit : 15.22 G
Physical Memory : 23.58 G
Max memory limit seem to be within acceptable norms

KEY BUFFER
Current MyISAM index space = 318 M
Current key_buffer_size = 8.00 G
Key cache miss rate is 1 : 14707
Key buffer free ratio = 81 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere

QUERY CACHE
Query cache is enabled
Current query_cache_size = 128 M
Current query_cache_used = 87 M
Current query_cache_limit = 148 M
Current Query cache Memory fill ratio = 68.69 %
Current query_cache_min_res_unit = 4 K
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 = 8.00 M
You have had 22 queries where a join could not use an index properly
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 = 12510 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 = 6000 tables
Current table_definition_cache = 5000 tables
You have a total of 1452 tables
You have 2022 open tables.
The table_cache value seems to be fine

TEMP TABLES
Current max_heap_table_size = 512 M
Current tmp_table_size = 512 M
Of 683409 temp tables, 39% 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 = 4 M
Current table scan ratio = 750 : 1
read_buffer_size seems to be fine

TABLE LOCKING
Current Lock Wait ratio = 1 : 227
You may benefit from selective use of InnoDB.

my.cnf

[mysqld]
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

# Semisynchronous Replication
# http://dev.mysql.com/doc/refman/5.5/en/replication-semisync.html
# uncomment next line on MASTER
;plugin-load=rpl_semi_sync_master=semisync_master.so
# uncomment next line on SLAVE
;plugin-load=rpl_semi_sync_slave=semisync_slave.so

# Others options for Semisynchronous Replication
;rpl_semi_sync_master_enabled=1
;rpl_semi_sync_master_timeout=10
;rpl_semi_sync_slave_enabled=1

# http://dev.mysql.com/doc/refman/5.5/en/performance-schema.html
;performance_schema

query_cache_size=128M
query_cache_limit=148M
log-queries-not-using-indexes=/var/log/mysql/mysql-index.log
table_cache=6000
table_definition_cache=5000
max_heap_table_size=512M
tmp_table_size=512M
thread_cache_size = 50K
max_connections = 500
key_buffer_size=8G
join_buffer_size=8M
read_buffer_size = 4M
long_query_time =3
log_slow_queries=/var/log/mysql/mysql-slow.log
innodb_buffer_pool_size = 8M
low_priority_updates=1
concurrent_insert=ALWAYS
skip-host-cache
skip-name-resolve
ft_min_word_len=3
wait_timeout = 30
connect_timeout = 10
interactive_timeout = 10
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

 

[cPanelMichael]

Hello

You may want to check the MySQL error log (/var/lib/mysql/$hostname.err) to see if you can determine where the MySQL aborted connections are coming from. Make sure any scripts that utilize the MySQL root password are using the correct one.

Thank you.