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How to see the MySQL variables




Log into your MySQL database and type:

show variables;

You will see the following:

mysql> show variables;

+-----------------------------------------+-------------------------------------------------------------------------------------------+
| Variable_name                           | Value                                                                                     |
+-----------------------------------------+-------------------------------------------------------------------------------------------+
| auto_increment_increment                | 1                                                                                         |
| auto_increment_offset                   | 1                                                                                         |
| autocommit                              | ON                                                                                        |
| automatic_sp_privileges                 | ON                                                                                        |
| back_log                                | 50                                                                                        |
| basedir                                 | /                                                                                         |
| big_tables                              | OFF                                                                                       |
| binlog_cache_size                       | 32768                                                                                     |
| binlog_direct_non_transactional_updates | OFF                                                                                       |
| binlog_format                           | STATEMENT                                                                                 |
| bulk_insert_buffer_size                 | 8388608                                                                                   |
| character_set_client                    | latin1                                                                                    |
| character_set_connection                | latin1                                                                                    |
| character_set_database                  | latin1                                                                                    |
| character_set_filesystem                | binary                                                                                    |
| character_set_results                   | latin1                                                                                    |
| character_set_server                    | latin1                                                                                    |
| character_set_system                    | utf8                                                                                      |
| character_sets_dir                      | /usr/share/mysql/charsets/                                                                |
| collation_connection                    | latin1_swedish_ci                                                                         |
| collation_database                      | latin1_swedish_ci                                                                         |
| collation_server                        | latin1_swedish_ci                                                                         |
| completion_type                         | 0                                                                                         |
| concurrent_insert                       | 1                                                                                         |
| connect_timeout                         | 10                                                                                        |
| datadir                                 | /var/lib/mysql/                                                                           |
| 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                  | 30                                                                                        |
| delayed_queue_size                      | 1000                                                                                      |
| div_precision_increment                 | 4                                                                                         |
| engine_condition_pushdown               | ON                                                                                        |
| error_count                             | 0                                                                                         |
| event_scheduler                         | OFF                                                                                       |
| expire_logs_days                        | 0                                                                                         |
| flush                                   | OFF                                                                                       |
| flush_time                              | 0                                                                                         |
| foreign_key_checks                      | ON                                                                                        |
| ft_boolean_syntax                       | + -><()~*:""&|                                                                            |
| ft_max_word_len                         | 84                                                                                        |
| ft_min_word_len                         | 4                                                                                         |
| ft_query_expansion_limit                | 20                                                                                        |
| ft_stopword_file                        | (built-in)                                                                                |
| general_log                             | OFF                                                                                       |
| general_log_file                        | /var/lib/mysql/web1.log                                                                   |
| group_concat_max_len                    | 1024                                                                                      |
| have_community_features                 | YES                                                                                       |
| have_compress                           | YES                                                                                       |
| have_crypt                              | YES                                                                                       |
| have_csv                                | YES                                                                                       |
| have_dynamic_loading                    | YES                                                                                       |
| have_geometry                           | YES                                                                                       |
| have_innodb                             | YES                                                                                       |
| have_ndbcluster                         | NO                                                                                        |
| have_openssl                            | DISABLED                                                                                  |
| have_partitioning                       | YES                                                                                       |
| have_query_cache                        | YES                                                                                       |
| have_rtree_keys                         | YES                                                                                       |
| have_ssl                                | DISABLED                                                                                  |
| have_symlink                            | YES                                                                                       |
| hostname                                | web1.server.com                                                                        |
| identity                                | 0                                                                                         |
| ignore_builtin_innodb                   | OFF                                                                                       |
| init_connect                            |                                                                                           |
| init_file                               |                                                                                           |
| init_slave                              |                                                                                           |
| innodb_adaptive_hash_index              | ON                                                                                        |
| innodb_additional_mem_pool_size         | 1048576                                                                                   |
| innodb_autoextend_increment             | 8                                                                                         |
| innodb_autoinc_lock_mode                | 1                                                                                         |
| innodb_buffer_pool_size                 | 67108864                                                                                  |
| innodb_checksums                        | ON                                                                                        |
| innodb_commit_concurrency               | 0                                                                                         |
| innodb_concurrency_tickets              | 500                                                                                       |
| innodb_data_file_path                   | ibdata1:10M:autoextend                                                                    |
| innodb_data_home_dir                    |                                                                                           |
| innodb_doublewrite                      | ON                                                                                        |
| innodb_fast_shutdown                    | 1                                                                                         |
| innodb_file_io_threads                  | 4                                                                                         |
| innodb_file_per_table                   | ON                                                                                        |
| innodb_flush_log_at_trx_commit          | 2                                                                                         |
| innodb_flush_method                     | O_DIRECT                                                                                  |
| innodb_force_recovery                   | 0                                                                                         |
| innodb_lock_wait_timeout                | 50                                                                                        |
| innodb_locks_unsafe_for_binlog          | 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                    | 100000                                                                                    |
| innodb_mirrored_log_groups              | 1                                                                                         |
| innodb_open_files                       | 300                                                                                       |
| innodb_rollback_on_timeout              | OFF                                                                                       |
| innodb_stats_on_metadata                | ON                                                                                        |
| innodb_support_xa                       | ON                                                                                        |
| innodb_sync_spin_loops                  | 20                                                                                        |
| innodb_table_locks                      | ON                                                                                        |
| innodb_thread_concurrency               | 2                                                                                         |
| innodb_thread_sleep_delay               | 10000                                                                                     |
| innodb_use_legacy_cardinality_algorithm | ON                                                                                        |
| insert_id                               | 0                                                                                         |
| interactive_timeout                     | 100                                                                                       |
| join_buffer_size                        | 1048576                                                                                   |
| keep_files_on_create                    | OFF                                                                                       |
| key_buffer_size                         | 67108864                                                                                  |
| key_cache_age_threshold                 | 300                                                                                       |
| key_cache_block_size                    | 1024                                                                                      |
| key_cache_division_limit                | 100                                                                                       |
| language                                | /usr/share/mysql/english/                                                                 |
| large_files_support                     | ON                                                                                        |
| large_page_size                         | 0                                                                                         |
| large_pages                             | OFF                                                                                       |
| last_insert_id                          | 0                                                                                         |
| lc_time_names                           | en_US                                                                                     |
| license                                 | GPL                                                                                       |
| local_infile                            | OFF                                                                                       |
| locked_in_memory                        | OFF                                                                                       |
| log                                     | OFF                                                                                       |
| log_bin                                 | OFF                                                                                       |
| log_bin_trust_function_creators         | OFF                                                                                       |
| log_bin_trust_routine_creators          | OFF                                                                                       |
| log_error                               | /var/log/mysqld.log                                                                       |
| log_output                              | FILE                                                                                      |
| log_queries_not_using_indexes           | OFF                                                                                       |
| log_slave_updates                       | OFF                                                                                       |
| log_slow_queries                        | OFF                                                                                       |
| log_warnings                            | 2                                                                                         |
| long_query_time                         | 1.000000                                                                                  |
| low_priority_updates                    | ON                                                                                        |
| lower_case_file_system                  | OFF                                                                                       |
| lower_case_table_names                  | 0                                                                                         |
| max_allowed_packet                      | 16777216                                                                                  |
| max_binlog_cache_size                   | 18446744073709547520                                                                      |
| max_binlog_size                         | 1073741824                                                                                |
| max_connect_errors                      | 10                                                                                        |
| max_connections                         | 250                                                                                       |
| max_delayed_threads                     | 20                                                                                        |
| max_error_count                         | 64                                                                                        |
| max_heap_table_size                     | 67108864                                                                                  |
| max_insert_delayed_threads              | 20                                                                                        |
| max_join_size                           | 33554432                                                                                  |
| max_length_for_sort_data                | 1024                                                                                      |
| max_prepared_stmt_count                 | 16382                                                                                     |
| max_relay_log_size                      | 0                                                                                         |
| max_seeks_for_key                       | 18446744073709551615                                                                      |
| max_sort_length                         | 1024                                                                                      |
| max_sp_recursion_depth                  | 0                                                                                         |
| max_tmp_tables                          | 256                                                                                       |
| max_user_connections                    | 100                                                                                       |
| max_write_lock_count                    | 18446744073709551615                                                                      |
| min_examined_row_limit                  | 0                                                                                         |
| multi_range_count                       | 256                                                                                       |
| myisam_data_pointer_size                | 6                                                                                         |
| myisam_max_sort_file_size               | 9223372036853727232                                                                       |
| myisam_mmap_size                        | 18446744073709551615                                                                      |
| myisam_recover_options                  | OFF                                                                                       |
| myisam_repair_threads                   | 1                                                                                         |
| myisam_sort_buffer_size                 | 33554432                                                                                  |
| myisam_stats_method                     | nulls_unequal                                                                             |
| myisam_use_mmap                         | OFF                                                                                       |
| net_buffer_length                       | 16384                                                                                     |
| net_read_timeout                        | 30                                                                                        |
| net_retry_count                         | 10                                                                                        |
| net_write_timeout                       | 60                                                                                        |
| new                                     | OFF                                                                                       |
| old                                     | OFF                                                                                       |
| old_alter_table                         | OFF                                                                                       |
| old_passwords                           | OFF                                                                                       |
| open_files_limit                        | 8192                                                                                      |
| optimizer_prune_level                   | 1                                                                                         |
| optimizer_search_depth                  | 62                                                                                        |
| optimizer_switch                        | index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on |
| pid_file                                | /var/lib/mysql/web1.server.com.pid                                                     |
| plugin_dir                              | /usr/lib64/mysql/plugin                                                                   |
| port                                    | 3306                                                                                      |
| preload_buffer_size                     | 32768                                                                                     |
| profiling                               | OFF                                                                                       |
| profiling_history_size                  | 15                                                                                        |
| protocol_version                        | 10                                                                                        |
| pseudo_thread_id                        | 1837920                                                                                   |
| query_alloc_block_size                  | 8192                                                                                      |
| query_cache_limit                       | 8388608                                                                                   |
| query_cache_min_res_unit                | 4096                                                                                      |
| query_cache_size                        | 33554432                                                                                  |
| query_cache_type                        | ON                                                                                        |
| query_cache_wlock_invalidate            | OFF                           

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