How can I see the MySQL variables?

Login to your mysql DB as any user and type:

show variables;

You will get something like:

 mysql> show variables;
+---------------------------------+------------------------------------------+
| Variable_name                   | Value                                    |
+---------------------------------+------------------------------------------+
| auto_increment_increment        | 1                                        |
| auto_increment_offset           | 1                                        |
| automatic_sp_privileges         | ON                                       |
| back_log                        | 50                                       |
| basedir                         | /                                        |
| binlog_cache_size               | 32768                                    |
| bulk_insert_buffer_size         | 8388608                                  |
| character_set_client            | greek                                    |
| character_set_connection        | greek                                    |
| character_set_database          | greek                                    |
| character_set_filesystem        | binary                                   |
| character_set_results           | greek                                    |
| character_set_server            | greek                                    |
| character_set_system            | utf8                                     |
| character_sets_dir              | /usr/share/mysql/charsets/               |
| collation_connection            | greek_general_ci                         |
| collation_database              | greek_general_ci                         |
| collation_server                | greek_general_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          | 300                                      |
| delayed_queue_size              | 1000                                     |
| div_precision_increment         | 4                                        |
| 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           | NO                                       |
| have_compress                   | YES                                      |
| have_crypt                      | YES                                      |
| have_csv                        | NO                                       |
| have_example_engine             | NO                                       |
| have_federated_engine           | NO                                       |
| have_geometry                   | YES                                      |
| have_innodb                     | DISABLED                                 |
| have_isam                       | NO                                       |
| have_ndbcluster                 | NO                                       |
| have_openssl                    | NO                                       |
| have_query_cache                | YES                                      |
| have_raid                       | NO                                       |
| have_rtree_keys                 | YES                                      |
| have_symlink                    | YES                                      |
| init_connect                    | SET NAMES greek                          |
| 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           |                                          |
| innodb_data_home_dir            |                                          |
| 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_support_xa               | ON                                       |
| innodb_sync_spin_loops          | 20                                       |
| innodb_table_locks              | ON                                       |
| innodb_thread_concurrency       | 0                                        |
| innodb_thread_sleep_delay       | 10000                                    |
| interactive_timeout             | 100                                      |
| join_buffer_size                | 1044480                                  |
| key_buffer_size                 | 16777216                                 |
| 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                                      |
| license                         | GPL                                      |
| local_infile                    | ON                                       |
| locked_in_memory                | OFF                                      |
| log                             | OFF                                      |
| log_bin                         | ON                                       |
| log_bin_trust_function_creators | OFF                                      |
| log_error                       |                                          |
| 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              | 16776192                                 |
| max_binlog_cache_size           | 18446744073709551615                     |
| max_binlog_size                 | 1073741824                               |
| max_connect_errors              | 10                                       |
| max_connections                 | 500                                      |
| 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_relay_log_size              | 0                                        |
| max_seeks_for_key               | 18446744073709551615                     |
| max_sort_length                 | 1024                                     |
| max_sp_recursion_depth          | 0                                        |
| max_tmp_tables                  | 32                                       |
| max_user_connections            | 0                                        |
| max_write_lock_count            | 18446744073709551615                     |
| multi_range_count               | 256                                      |
| myisam_data_pointer_size        | 6                                        |
| myisam_max_sort_file_size       | 9223372036854775807                      |
| myisam_recover_options          | OFF                                      |
| myisam_repair_threads           | 1                                        |
| myisam_sort_buffer_size         | 67108864                                 |
| myisam_stats_method             | nulls_unequal                            |
| net_buffer_length               | 16384                                    |
| net_read_timeout                | 30                                       |
| net_retry_count                 | 10                                       |
| net_write_timeout               | 60                                       |
| new                             | OFF                                      |
| old_passwords                   | OFF                                      |
| open_files_limit                | 65535                                    |
| optimizer_prune_level           | 1                                        |
| optimizer_search_depth          | 62                                       |
| pid_file                        | /var/lib/mysql/myhostname.gr.pid    |
| port                            | 3306                                     |
| preload_buffer_size             | 32768                                    |
| protocol_version                | 10                                       |
| query_alloc_block_size          | 8192                                     |
| query_cache_limit               | 1048576                                  |
| query_cache_min_res_unit        | 4096                                     |
| query_cache_size                | 33554432                                 |
| query_cache_type                | ON                                       |
| query_cache_wlock_invalidate    | OFF                                      |
| query_prealloc_size             | 8192                                     |
| range_alloc_block_size          | 2048                                     |
| read_buffer_size                | 2093056                                  |
| read_only                       | OFF                                      |
| read_rnd_buffer_size            | 262144                                   |
| relay_log_purge                 | ON                                       |
| relay_log_space_limit           | 0                                        |
| rpl_recovery_rank               | 0                                        |
| secure_auth                     | OFF                                      |
| 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                          | /var/lib/mysql/mysql.sock                |
| sort_buffer_size                | 2097144                                  |
| sql_mode                        |                                          |
| sql_notes                       | ON                                       |
| sql_warnings                    | ON                                       |
| storage_engine                  | MyISAM                                   |
| sync_binlog                     | 0                                        |
| sync_frm                        | ON                                       |
| sync_replication                | 0                                        |
| sync_replication_slave_id       | 0                                        |
| sync_replication_timeout        | 10                                       |
| system_time_zone                | EET                                      |
| table_cache                     | 1024                                     |
| table_lock_wait_timeout         | 50                                       |
| table_type                      | MyISAM                                   |
| thread_cache_size               | 128                                      |
| thread_stack                    | 262144              

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