一个命令查看mysql的所有配置（原创）

在mysql的命令提示符下，执行下面一句话,查看mysql服务器的所有全局配置信息：

mysql> show global variables;

得到：

上表的文本内容：

"Variable_name"	"Value"
"auto_increment_increment"	"1"
"auto_increment_offset"	"1"
"autocommit"	"ON"
"automatic_sp_privileges"	"ON"
"back_log"	"50"
"basedir"	"C:\\Program Files (x86)\\MySQL\\MySQL Server 5.1\\"
"big_tables"	"OFF"
"binlog_cache_size"	"32768"
"binlog_direct_non_transactional_updates"	"OFF"
"binlog_format"	"STATEMENT"
"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"	"C:\\Program Files (x86)\\MySQL\\MySQL Server 5.1\\share\\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"	"D:\\ProgramData\\MySQL\\MySQL Server 5.1\\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"
"engine_condition_pushdown"	"ON"
"error_count"	"0"
"event_scheduler"	"OFF"
"expire_logs_days"	"0"
"flush"	"OFF"
"flush_time"	"1800"
"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"	"ON"
"general_log_file"	"D:\\ProgramData\\MySQL\\MySQL Server 5.1\\Data\\WIN-2736PK059N6.log"
"group_concat_max_len"	"102400"
"have_community_features"	"YES"
"have_compress"	"YES"
"have_crypt"	"NO"
"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"	"WIN-2736PK059N6"
"identity"	"0"
"ignore_builtin_innodb"	"OFF"
"init_connect"	"SET NAMES utf8"
"init_file"	""
"init_slave"	""
"innodb_adaptive_hash_index"	"ON"
"innodb_additional_mem_pool_size"	"8388608"
"innodb_autoextend_increment"	"8"
"innodb_autoinc_lock_mode"	"1"
"innodb_buffer_pool_size"	"378535936"
"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"	"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_buffer_size"	"4194304"
"innodb_log_file_size"	"76546048"
"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_stats_on_metadata"	"ON"
"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"
"insert_id"	"0"
"interactive_timeout"	"288000"
"join_buffer_size"	"131072"
"keep_files_on_create"	"OFF"
"key_buffer_size"	"195035136"
"key_cache_age_threshold"	"300"
"key_cache_block_size"	"1024"
"key_cache_division_limit"	"100"
"language"	"C:\\Program Files (x86)\\MySQL\\MySQL Server 5.1\\share\\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"	"ON"
"log"	"ON"
"log_bin"	"OFF"
"log_bin_trust_function_creators"	"OFF"
"log_bin_trust_routine_creators"	"OFF"
"log_error"	"D:\\ProgramData\\MySQL\\MySQL Server 5.1\\Data\\WIN-2736PK059N6.err"
"log_output"	"FILE"
"log_queries_not_using_indexes"	"OFF"
"log_slave_updates"	"OFF"
"log_slow_queries"	"ON"
"log_warnings"	"1"
"long_query_time"	"3.000000"
"low_priority_updates"	"OFF"
"lower_case_file_system"	"ON"
"lower_case_table_names"	"1"
"max_allowed_packet"	"524288000"
"max_binlog_cache_size"	"4294963200"
"max_binlog_size"	"1073741824"
"max_connect_errors"	"10"
"max_connections"	"1510"
"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"
"min_examined_row_limit"	"0"
"multi_range_count"	"256"
"myisam_data_pointer_size"	"6"
"myisam_max_sort_file_size"	"107374182400"
"myisam_mmap_size"	"4294967295"
"myisam_recover_options"	"OFF"
"myisam_repair_threads"	"1"
"myisam_sort_buffer_size"	"23068672"
"myisam_stats_method"	"nulls_unequal"
"myisam_use_mmap"	"OFF"
"named_pipe"	"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"	"2048"
"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"	"D:\\ProgramData\\MySQL\\MySQL Server 5.1\\Data\\WIN-2736PK059N6.pid"
"plugin_dir"	"C:\\Program Files (x86)\\MySQL\\MySQL Server 5.1\\lib/plugin"
"port"	"3306"
"preload_buffer_size"	"32768"
"profiling"	"OFF"
"profiling_history_size"	"15"
"protocol_version"	"10"
"pseudo_thread_id"	"0"
"query_alloc_block_size"	"8192"
"query_cache_limit"	"1048576"
"query_cache_min_res_unit"	"4096"
"query_cache_size"	"127926272"
"query_cache_type"	"ON"
"query_cache_wlock_invalidate"	"OFF"
"query_prealloc_size"	"8192"
"rand_seed1"	""
"rand_seed2"	""
"range_alloc_block_size"	"4096"
"read_buffer_size"	"65536"
"read_only"	"OFF"
"read_rnd_buffer_size"	"262144"
"relay_log"	""
"relay_log_index"	""
"relay_log_info_file"	"relay-log.info"
"relay_log_purge"	"ON"
"relay_log_space_limit"	"0"
"report_host"	""
"report_password"	""
"report_port"	"3306"
"report_user"	""
"rpl_recovery_rank"	"0"
"secure_auth"	"OFF"
"secure_file_priv"	""
"server_id"	"0"
"shared_memory"	"OFF"
"shared_memory_base_name"	"MYSQL"
"skip_external_locking"	"ON"
"skip_name_resolve"	"ON"
"skip_networking"	"OFF"
"skip_show_database"	"OFF"
"slave_compressed_protocol"	"OFF"
"slave_exec_mode"	"STRICT"
"slave_load_tmpdir"	"C:\\Windows\\TEMP"
"slave_net_timeout"	"3600"
"slave_skip_errors"	"OFF"
"slave_transaction_retries"	"10"
"slow_launch_time"	"2"
"slow_query_log"	"ON"
"slow_query_log_file"	"C:\\Program Files (x86)\\MySQL\\MySQL Server 5.1\\mysqllog/slowquery.log"
"socket"	"MySQL"
"sort_buffer_size"	"262144"
"sql_auto_is_null"	"ON"
"sql_big_selects"	"ON"
"sql_big_tables"	"OFF"
"sql_buffer_result"	"OFF"
"sql_log_bin"	"ON"
"sql_log_off"	"OFF"
"sql_log_update"	"ON"
"sql_low_priority_updates"	"OFF"
"sql_max_join_size"	"18446744073709551615"
"sql_mode"	"STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"
"sql_notes"	"ON"
"sql_quote_show_create"	"ON"
"sql_safe_updates"	"OFF"
"sql_select_limit"	"18446744073709551615"
"sql_slave_skip_counter"	""
"sql_warnings"	"OFF"
"ssl_ca"	""
"ssl_capath"	""
"ssl_cert"	""
"ssl_cipher"	""
"ssl_key"	""
"storage_engine"	"InnoDB"
"sync_binlog"	"0"
"sync_frm"	"ON"
"system_time_zone"	""
"table_definition_cache"	"256"
"table_lock_wait_timeout"	"50"
"table_open_cache"	"264"
"table_type"	"InnoDB"
"thread_cache_size"	"64"
"thread_handling"	"one-thread-per-connection"
"thread_stack"	"196608"
"time_format"	"%H:%i:%s"
"time_zone"	"SYSTEM"
"timed_mutexes"	"OFF"
"timestamp"	"1484874972"
"tmp_table_size"	"23068672"
"tmpdir"	"C:\\Windows\\TEMP"
"transaction_alloc_block_size"	"8192"
"transaction_prealloc_size"	"4096"
"tx_isolation"	"REPEATABLE-READ"
"unique_checks"	"ON"
"updatable_views_with_limit"	"YES"
"version"	"5.1.53-community-log"
"version_comment"	"MySQL Community Server (GPL)"
"version_compile_machine"	"ia32"
"version_compile_os"	"Win32"
"wait_timeout"	"288000"
"warning_count"	"1"

如果需要在众多的全局变量中，找到某一个变量的值的办法是在上边的命令后面使用 “LIKE %需要的特征值%”模糊查找包含特征值的全局配置。

例如：

1.mysql查看数据库的数据存放目录命令：

>mysql> show global variables like "%datadir%";