[Mysql] too many connections 에러 메세지 뜰때 (설정확인, 프로세서 확인)

1. Mysql 설정된 내용보기
     > mysqladmin -u root -p variables

     > 패스워드 입력

 

     위의 결과에서
     max_connections | 100 
     wait_timeout | 300
     와 같은 것을 볼수 있습니다 . (설정에 따라 숫자는 다르게 나타납니다.)
     max_connections, wait_timeout 의 수치를 올려준다.

 

2. MySQL실행시에 주는 실행옵션값은 다음과 같다.
    > ./safe_mysqld -O max_connections=1000 -O table_cache=256 -O wait_timeout=800 &

 

3. 살아있는 프로세서 확인하기
    > mysqladmin -u root -p processlist

해보면...

[root@smart01 mysql]# ./bin/mysqladmin -u root -p processlist
Enter password:
+----+-------+--------------------+---------+---------+------+-------+------------------+
| Id | User  | Host               | db      | Command | Time | State | Info             |
+----+-------+--------------------+---------+---------+------+-------+------------------+
| 7  | smart | 192.168.1.186:1992 | testDB | Sleep   | 1372 |       |                  |
| 8  | smart | 192.168.1.186:1993 | testDB | Sleep   | 4    |       |                  |
| 9  | smart | 192.168.1.186:1994 | testDB | Sleep   | 1599 |       |                  |
| 13 | root  | localhost          |         | Query   | 0    |       | show processlist |
+----+-------+--------------------+---------+---------+------+-------+------------------+

[root@smart01 mysql]# ./bin/mysqladmin -u root -p variables
Enter password:
+-----------------------------------------+----------------------------------------------------------+
| Variable_name                           | Value                                                    |
+-----------------------------------------+----------------------------------------------------------+
| auto_increment_increment                | 1                                                        |
| auto_increment_offset                   | 1                                                        |
| automatic_sp_privileges                 | ON                                                       |
| back_log                                | 50                                                       |
| basedir                                 | /usr/local/mysql-5.0.82-linux-i686/                      |
| binlog_cache_size                       | 32768                                                    |
| bulk_insert_buffer_size                 | 8388608                                                  |
| character_set_client                    | utf8                                                     |
| character_set_connection                | utf8                                                     |
| character_set_database                  | utf8                                                     |
| character_set_filesystem                | binary                                                   |
| character_set_results                   | utf8                                                     |
| character_set_server                    | utf8                                                     |
| character_set_system                    | utf8                                                     |
| character_sets_dir                      | /usr/local/mysql-5.0.82-linux-i686/share/mysql/charsets/ |
| collation_connection                    | utf8_general_ci                                          |
| collation_database                      | utf8_general_ci                                          |
| collation_server                        | utf8_general_ci                                          |
| completion_type                         | 0                                                        |
| concurrent_insert                       | 1                                                        |
| connect_timeout                         | 10                                                       |
| datadir                                 | /usr/local/mysql/data/                                   |
| date_format                             | %Y-%m-%d                                                 |
| datetime_format                         | %Y-%m-%d %H:%i:%s                                        |
| default_week_format                     | 0                                                        |
| delay_key_write                         | ON                                                       |
| delayed_insert_limit                    | 100                                                      |
| delayed_insert_timeout                  | 300                                                      |
| delayed_queue_size                      | 1000                                                     |
| div_precision_increment                 | 4                                                        |
| keep_files_on_create                    | OFF                                                      |
| engine_condition_pushdown               | OFF                                                      |
| expire_logs_days                        | 0                                                        |
| flush                                   | OFF                                                      |
| flush_time                              | 0                                                        |
| ft_boolean_syntax                       | + -><()~*:""&|                                           |
| ft_max_word_len                         | 84                                                       |
| ft_min_word_len                         | 4                                                        |
| ft_query_expansion_limit                | 20                                                       |
| ft_stopword_file                        | (built-in)                                               |
| group_concat_max_len                    | 1024                                                     |
| have_archive                            | YES                                                      |
| have_bdb                                | NO                                                       |
| have_blackhole_engine                   | YES                                                      |
| have_compress                           | YES                                                      |
| have_community_features                 | YES                                                      |
| have_profiling                          | YES                                                      |
| have_crypt                              | YES                                                      |
| have_csv                                | YES                                                      |
| have_dynamic_loading                    | NO                                                       |
| have_example_engine                     | NO                                                       |
| have_federated_engine                   | DISABLED                                                 |
| have_geometry                           | YES                                                      |
| have_innodb                             | YES                                                      |
| have_isam                               | NO                                                       |
| have_merge_engine                       | YES                                                      |
| have_ndbcluster                         | DISABLED                                                 |
| have_openssl                            | DISABLED                                                 |
| have_ssl                                | DISABLED                                                 |
| have_query_cache                        | YES                                                      |
| have_raid                               | NO                                                       |
| have_rtree_keys                         | YES                                                      |
| have_symlink                            | YES                                                      |
| hostname                                | smart01                                                  |
| init_connect                            |                                                          |
| init_file                               |                                                          |
| init_slave                              |                                                          |
| innodb_additional_mem_pool_size         | 1048576                                                  |
| innodb_autoextend_increment             | 8                                                        |
| innodb_buffer_pool_awe_mem_mb           | 0                                                        |
| innodb_buffer_pool_size                 | 8388608                                                  |
| innodb_checksums                        | ON                                                       |
| innodb_commit_concurrency               | 0                                                        |
| innodb_concurrency_tickets              | 500                                                      |
| innodb_data_file_path                   | ibdata1:10M:autoextend                                   |
| innodb_data_home_dir                    |                                                          |
| innodb_adaptive_hash_index              | ON                                                       |
| innodb_doublewrite                      | ON                                                       |
| innodb_fast_shutdown                    | 1                                                        |
| innodb_file_io_threads                  | 4                                                        |
| innodb_file_per_table                   | OFF                                                      |
| innodb_flush_log_at_trx_commit          | 1                                                        |
| innodb_flush_method                     |                                                          |
| innodb_force_recovery                   | 0                                                        |
| innodb_lock_wait_timeout                | 50                                                       |
| innodb_locks_unsafe_for_binlog          | OFF                                                      |
| innodb_log_arch_dir                     |                                                          |
| innodb_log_archive                      | OFF                                                      |
| innodb_log_buffer_size                  | 1048576                                                  |
| innodb_log_file_size                    | 5242880                                                  |
| innodb_log_files_in_group               | 2                                                        |
| innodb_log_group_home_dir               | ./                                                       |
| innodb_max_dirty_pages_pct              | 90                                                       |
| innodb_max_purge_lag                    | 0                                                        |
| innodb_mirrored_log_groups              | 1                                                        |
| innodb_open_files                       | 300                                                      |
| innodb_rollback_on_timeout              | OFF                                                      |
| innodb_support_xa                       | ON                                                       |
| innodb_sync_spin_loops                  | 20                                                       |
| innodb_table_locks                      | ON                                                       |
| innodb_thread_concurrency               | 8                                                        |
| innodb_thread_sleep_delay               | 10000                                                    |
| innodb_use_legacy_cardinality_algorithm | ON                                                       |
| interactive_timeout                     | 28800                                                    |
| join_buffer_size                        | 131072                                                   |
| key_buffer_size                         | 16777216                                                 |
| key_cache_age_threshold                 | 300                                                      |
| key_cache_block_size                    | 1024                                                     |
| key_cache_division_limit                | 100                                                      |
| language                                | /usr/local/mysql-5.0.82-linux-i686/share/mysql/english/  |
| large_files_support                     | ON                                                       |
| large_page_size                         | 0                                                        |
| large_pages                             | OFF                                                      |
| lc_time_names                           | en_US                                                    |
| license                                 | GPL                                                      |
| local_infile                            | ON                                                       |
| locked_in_memory                        | OFF                                                      |
| log                                     | OFF                                                      |
| log_bin                                 | ON                                                       |
| log_bin_trust_function_creators         | OFF                                                      |
| log_error                               |                                                          |
| log_queries_not_using_indexes           | OFF                                                      |
| log_slave_updates                       | OFF                                                      |
| log_slow_queries                        | OFF                                                      |
| log_warnings                            | 1                                                        |
| long_query_time                         | 10                                                       |
| low_priority_updates                    | OFF                                                      |
| lower_case_file_system                  | OFF                                                      |
| lower_case_table_names                  | 0                                                        |
| max_allowed_packet                      | 1048576                                                  |
| max_binlog_cache_size                   | 4294963200                                               |
| max_binlog_size                         | 1073741824                                               |
| max_connect_errors                      | 10                                                       |
| max_connections                         | 100                                                      |
| max_delayed_threads                     | 20                                                       |
| max_error_count                         | 64                                                       |
| max_heap_table_size                     | 16777216                                                 |
| max_insert_delayed_threads              | 20                                                       |
| max_join_size                           | 18446744073709551615                                     |
| max_length_for_sort_data                | 1024                                                     |
| max_prepared_stmt_count                 | 16382                                                    |
| max_relay_log_size                      | 0                                                        |
| max_seeks_for_key                       | 4294967295                                               |
| max_sort_length                         | 1024                                                     |
| max_sp_recursion_depth                  | 0                                                        |
| max_tmp_tables                          | 32                                                       |
| max_user_connections                    | 0                                                        |
| max_write_lock_count                    | 4294967295                                               |
| multi_range_count                       | 256                                                      |
| myisam_data_pointer_size                | 6                                                        |
| myisam_max_sort_file_size               | 2146435072                                               |
| myisam_recover_options                  | OFF                                                      |
| myisam_repair_threads                   | 1                                                        |
| myisam_sort_buffer_size                 | 8388608                                                  |
| myisam_stats_method                     | nulls_unequal                                            |
| ndb_autoincrement_prefetch_sz           | 1                                                        |
| ndb_force_send                          | ON                                                       |
| ndb_use_exact_count                     | ON                                                       |
| ndb_use_transactions                    | ON                                                       |
| ndb_cache_check_time                    | 0                                                        |
| ndb_connectstring                       |                                                          |
| net_buffer_length                       | 8192                                                     |
| net_read_timeout                        | 30                                                       |
| net_retry_count                         | 10                                                       |
| net_write_timeout                       | 60                                                       |
| new                                     | OFF                                                      |
| old_passwords                           | OFF                                                      |
| open_files_limit                        | 1024                                                     |
| optimizer_prune_level                   | 1                                                        |
| optimizer_search_depth                  | 62                                                       |
| pid_file                                | /usr/local/mysql/data/smart01.pid                        |
| plugin_dir                              |                                                          |
| port                                    | 3306                                                     |
| preload_buffer_size                     | 32768                                                    |
| profiling                               | OFF                                                      |
| profiling_history_size                  | 15                                                       |
| protocol_version                        | 10                                                       |
| query_alloc_block_size                  | 8192                                                     |
| query_cache_limit                       | 1048576                                                  |
| query_cache_min_res_unit                | 4096                                                     |
| query_cache_size                        | 0                                                        |
| query_cache_type                        | ON                                                       |
| query_cache_wlock_invalidate            | OFF                                                      |
| query_prealloc_size                     | 8192                                                     |
| range_alloc_block_size                  | 4096                                                     |
| read_buffer_size                        | 262144                                                   |
| read_only                               | OFF                                                      |
| read_rnd_buffer_size                    | 524288                                                   |
| relay_log                               |                                                          |
| relay_log_index                         |                                                          |
| relay_log_info_file                     | relay-log.info                                           |
| relay_log_purge                         | ON                                                       |
| relay_log_space_limit                   | 0                                                        |
| rpl_recovery_rank                       | 0                                                        |
| secure_auth                             | OFF                                                      |
| secure_file_priv                        |                                                          |
| server_id                               | 1                                                        |
| skip_external_locking                   | ON                                                       |
| skip_networking                         | OFF                                                      |
| skip_show_database                      | OFF                                                      |
| slave_compressed_protocol               | OFF                                                      |
| slave_load_tmpdir                       | /tmp/                                                    |
| slave_net_timeout                       | 3600                                                     |
| slave_skip_errors                       | OFF                                                      |
| slave_transaction_retries               | 10                                                       |
| slow_launch_time                        | 2                                                        |
| socket                                  | /tmp/mysql.sock                                          |
| sort_buffer_size                        | 524288                                                   |
| sql_big_selects                         | ON                                                       |
| sql_mode                                |                                                          |
| sql_notes                               | ON                                                       |
| sql_warnings                            | OFF                                                      |
| ssl_ca                                  |                                                          |
| ssl_capath                              |                                                          |
| ssl_cert                                |                                                          |
| ssl_cipher                              |                                                          |
| ssl_key                                 |                                                          |
| storage_engine                          | MyISAM                                                   |
| sync_binlog                             | 0                                                        |
| sync_frm                                | ON                                                       |
| system_time_zone                        | JST                                                      |
| table_cache                             | 64                                                       |
| table_lock_wait_timeout                 | 50                                                       |
| table_type                              | MyISAM                                                   |
| thread_cache_size                       | 0                                                        |
| thread_stack                            | 131072                                                   |
| time_format                             | %H:%i:%s                                                 |
| time_zone                               | SYSTEM                                                   |
| timed_mutexes                           | OFF                                                      |
| tmp_table_size                          | 33554432                                                 |
| tmpdir                                  | /tmp/                                                    |
| transaction_alloc_block_size            | 8192                                                     |
| transaction_prealloc_size               | 4096                                                     |
| tx_isolation                            | REPEATABLE-READ                                          |
| updatable_views_with_limit              | YES                                                      |
| version                                 | 5.0.82-log                                               |
| version_comment                         | MySQL Community Server (GPL)                             |
| version_compile_machine                 | i686                                                     |
| version_compile_os                      | pc-linux-gnu                                             |
| wait_timeout                            | 28800                                                    |
+-----------------------------------------+----------------------------------------------------------+
[root@smart01 mysql]#