Hi all we are having a strange problem at the web site I work for (it's an Italian registar).
"Sometimes" (that means: every 15/20 days) our db (MySQL) just hangs with a "Too many connections" error. The strange thing is that the DB server is stuck untill we restart it (actually, we always had to restart the whole server as root didn't have SUPER privileges, so nobody could connect to the db...)
Since I'm pretty sure that we don't have such a traffic that justifies this error (it happened once at 2 a.m), I would *really* like to know what the heck is going on.
Odd things are that:
- we already raised the number of connections, and that didn't help
- we lowered the wait_timeout var, setting it to 3000, but this didn't help neither (we did this because, with a 'show processlist;' we noticed sometimes some hanging queries and we thought: "Well if me make the die quicker maybe they won't pile up and won't block our server anymore". Wrong.)
Last time this thing happened the 'top' command showed about 380 'httpd' processes sleeping (and the system was very very slow, 'top' again showed a load average above 100, while it usually is at around 0.5).
Now what I'm asking is:
- has anybody else ever experienced this problem?
- in any case, what do you think we should monitor? Top? MySQL logs (We once turned on the General Query Log, but nothing happened and the file became huge in very little time...)? Apache logs?
- could it be just a "client" issue (that is, PHP or Apache don't close the connection - although in PHP we only use mysql_connect, and never do a _pconnect)? How could we monitor this?
Our system runs with: - Linux 2.4.22-1.2188.nptl (Fedora 1) - MySQL 4.0.13 - PHP 4.3.4 - Apache 2.0.48
Thank's everybody for any help! Silvio
P.S: This is the output of 'show variables\G':
*************************** 1. row ***************************
Variable_name: back_log
Value: 50
*************************** 2. row ***************************
Variable_name: basedir
Value: /
*************************** 3. row ***************************
Variable_name: binlog_cache_size
Value: 32768
*************************** 4. row ***************************
Variable_name: bulk_insert_buffer_size
Value: 8388608
*************************** 5. row ***************************
Variable_name: character_set
Value: latin1
*************************** 6. row ***************************
Variable_name: character_sets
Value: latin1 big5 czech euc_kr gb2312 gbk latin1_de sjis tis620 ujis dec8 dos german1 hp8 koi8_ru latin2 swe7 usa7 cp1251 danish hebrew win1251 estonia hungarian koi8_ukr win1251ukr greek win1250 croat cp1257 latin5
*************************** 7. row ***************************
Variable_name: concurrent_insert
Value: ON
*************************** 8. row ***************************
Variable_name: connect_timeout
Value: 5
*************************** 9. row ***************************
Variable_name: convert_character_set
Value:
*************************** 10. row ***************************
Variable_name: datadir
Value: /var/lib/mysql/
*************************** 11. row ***************************
Variable_name: delay_key_write
Value: ON
*************************** 12. row ***************************
Variable_name: delayed_insert_limit
Value: 100
*************************** 13. row ***************************
Variable_name: delayed_insert_timeout
Value: 300
*************************** 14. row ***************************
Variable_name: delayed_queue_size
Value: 1000
*************************** 15. row ***************************
Variable_name: flush
Value: OFF
*************************** 16. row ***************************
Variable_name: flush_time
Value: 0
*************************** 17. row ***************************
Variable_name: ft_boolean_syntax
Value: + -><()~*:""&|
*************************** 18. row ***************************
Variable_name: ft_min_word_len
Value: 4
*************************** 19. row ***************************
Variable_name: ft_max_word_len
Value: 254
*************************** 20. row ***************************
Variable_name: ft_max_word_len_for_sort
Value: 20
*************************** 21. row ***************************
Variable_name: ft_stopword_file
Value: (built-in)
*************************** 22. row ***************************
Variable_name: have_bdb
Value: NO
*************************** 23. row ***************************
Variable_name: have_crypt
Value: YES
*************************** 24. row ***************************
Variable_name: have_innodb
Value: YES
*************************** 25. row ***************************
Variable_name: have_isam
Value: YES
*************************** 26. row ***************************
Variable_name: have_raid
Value: NO
*************************** 27. row ***************************
Variable_name: have_symlink
Value: YES
*************************** 28. row ***************************
Variable_name: have_openssl
Value: NO
*************************** 29. row ***************************
Variable_name: have_query_cache
Value: YES
*************************** 30. row ***************************
Variable_name: init_file
Value:
*************************** 31. row ***************************
Variable_name: innodb_additional_mem_pool_size
Value: 1048576
*************************** 32. row ***************************
Variable_name: innodb_buffer_pool_size
Value: 8388608
*************************** 33. row ***************************
Variable_name: innodb_data_file_path
Value: ibdata1:10M:autoextend
*************************** 34. row ***************************
Variable_name: innodb_data_home_dir
Value:
*************************** 35. row ***************************
Variable_name: innodb_file_io_threads
Value: 4
*************************** 36. row ***************************
Variable_name: innodb_force_recovery
Value: 0
*************************** 37. row ***************************
Variable_name: innodb_thread_concurrency
Value: 8
*************************** 38. row ***************************
Variable_name: innodb_flush_log_at_trx_commit
Value: 1
*************************** 39. row ***************************
Variable_name: innodb_fast_shutdown
Value: ON
*************************** 40. row ***************************
Variable_name: innodb_flush_method
Value:
*************************** 41. row ***************************
Variable_name: innodb_lock_wait_timeout
Value: 50
*************************** 42. row ***************************
Variable_name: innodb_log_arch_dir
Value: ./
*************************** 43. row ***************************
Variable_name: innodb_log_archive
Value: OFF
*************************** 44. row ***************************
Variable_name: innodb_log_buffer_size
Value: 1048576
*************************** 45. row ***************************
Variable_name: innodb_log_file_size
Value: 5242880
*************************** 46. row ***************************
Variable_name: innodb_log_files_in_group
Value: 2
*************************** 47. row ***************************
Variable_name: innodb_log_group_home_dir
Value: ./
*************************** 48. row ***************************
Variable_name: innodb_mirrored_log_groups
Value: 1
*************************** 49. row ***************************
Variable_name: innodb_max_dirty_pages_pct
Value: 90
*************************** 50. row ***************************
Variable_name: interactive_timeout
Value: 3000
*************************** 51. row ***************************
Variable_name: join_buffer_size
Value: 131072
*************************** 52. row ***************************
Variable_name: key_buffer_size
Value: 8388600
*************************** 53. row ***************************
Variable_name: language
Value: /usr/share/mysql/english/
*************************** 54. row ***************************
Variable_name: large_files_support
Value: ON
*************************** 55. row ***************************
Variable_name: local_infile
Value: ON
*************************** 56. row ***************************
Variable_name: locked_in_memory
Value: OFF
*************************** 57. row ***************************
Variable_name: log
Value: OFF
*************************** 58. row ***************************
Variable_name: log_update
Value: OFF
*************************** 59. row ***************************
Variable_name: log_bin
Value: OFF
*************************** 60. row ***************************
Variable_name: log_slave_updates
Value: OFF
*************************** 61. row ***************************
Variable_name: log_slow_queries
Value: OFF
*************************** 62. row ***************************
Variable_name: log_warnings
Value: OFF
*************************** 63. row ***************************
Variable_name: long_query_time
Value: 10
*************************** 64. row ***************************
Variable_name: low_priority_updates
Value: OFF
*************************** 65. row ***************************
Variable_name: lower_case_table_names
Value: OFF
*************************** 66. row ***************************
Variable_name: max_allowed_packet
Value: 1048576
*************************** 67. row ***************************
Variable_name: max_binlog_cache_size
Value: 4294967295
*************************** 68. row ***************************
Variable_name: max_binlog_size
Value: 1073741824
*************************** 69. row ***************************
Variable_name: max_connections
Value: 100
*************************** 70. row ***************************
Variable_name: max_connect_errors
Value: 10
*************************** 71. row ***************************
Variable_name: max_delayed_threads
Value: 20
*************************** 72. row ***************************
Variable_name: max_heap_table_size
Value: 16777216
*************************** 73. row ***************************
Variable_name: max_join_size
Value: 4294967295
*************************** 74. row ***************************
Variable_name: max_sort_length
Value: 1024
*************************** 75. row ***************************
Variable_name: max_user_connections
Value: 0
*************************** 76. row ***************************
Variable_name: max_tmp_tables
Value: 32
*************************** 77. row ***************************
Variable_name: max_write_lock_count
Value: 4294967295
*************************** 78. row ***************************
Variable_name: myisam_max_extra_sort_file_size
Value: 268435456
*************************** 79. row ***************************
Variable_name: myisam_max_sort_file_size
Value: 2147483647
*************************** 80. row ***************************
Variable_name: myisam_repair_threads
Value: 1
*************************** 81. row ***************************
Variable_name: myisam_recover_options
Value: OFF
*************************** 82. row ***************************
Variable_name: myisam_sort_buffer_size
Value: 8388608
*************************** 83. row ***************************
Variable_name: net_buffer_length
Value: 16384
*************************** 84. row ***************************
Variable_name: net_read_timeout
Value: 30
*************************** 85. row ***************************
Variable_name: net_retry_count
Value: 10
*************************** 86. row ***************************
Variable_name: net_write_timeout
Value: 60
*************************** 87. row ***************************
Variable_name: new
Value: OFF
*************************** 88. row ***************************
Variable_name: open_files_limit
Value: 0
*************************** 89. row ***************************
Variable_name: pid_file
Value: /var/lib/mysql/dns.nomitaly.it.pid
*************************** 90. row ***************************
Variable_name: log_error
Value:
*************************** 91. row ***************************
Variable_name: port
Value: 3306
*************************** 92. row ***************************
Variable_name: protocol_version
Value: 10
*************************** 93. row ***************************
Variable_name: read_buffer_size
Value: 131072
*************************** 94. row ***************************
Variable_name: read_rnd_buffer_size
Value: 262144
*************************** 95. row ***************************
Variable_name: rpl_recovery_rank
Value: 0
*************************** 96. row ***************************
Variable_name: query_cache_limit
Value: 1048576
*************************** 97. row ***************************
Variable_name: query_cache_size
Value: 0
*************************** 98. row ***************************
Variable_name: query_cache_type
Value: ON
*************************** 99. row ***************************
Variable_name: server_id
Value: 0
*************************** 100. row ***************************
Variable_name: slave_net_timeout
Value: 3600
*************************** 101. row ***************************
Variable_name: skip_external_locking
Value: ON
*************************** 102. row ***************************
Variable_name: skip_networking
Value: OFF
*************************** 103. row ***************************
Variable_name: skip_show_database
Value: OFF
*************************** 104. row ***************************
Variable_name: slow_launch_time
Value: 2
*************************** 105. row ***************************
Variable_name: socket
Value: /var/lib/mysql/mysql.sock
*************************** 106. row ***************************
Variable_name: sort_buffer_size
Value: 2097144
*************************** 107. row ***************************
Variable_name: sql_mode
Value: 0
*************************** 108. row ***************************
Variable_name: table_cache
Value: 64
*************************** 109. row ***************************
Variable_name: table_type
Value: MYISAM
*************************** 110. row ***************************
Variable_name: thread_cache_size
Value: 0
*************************** 111. row ***************************
Variable_name: thread_stack
Value: 126976
*************************** 112. row ***************************
Variable_name: tx_isolation
Value: REPEATABLE-READ
*************************** 113. row ***************************
Variable_name: timezone
Value: CET
*************************** 114. row ***************************
Variable_name: tmp_table_size
Value: 33554432
*************************** 115. row ***************************
Variable_name: tmpdir
Value: /tmp/
*************************** 116. row ***************************
Variable_name: version
Value: 4.0.13
*************************** 117. row ***************************
Variable_name: wait_timeout
Value: 3000
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