MYSQL SHOW VARIABLES命令

SHOW VARIABLES显示MySQL系统变量的值。 此声明不需要任何权限。 它只需要连接到服务器的即可。
语法
SHOW [GLOBAL | SESSION] VARIABLES [LIKE 'pattern' | WHERE expr]
常见的Variable_name名/值

mysql> SHOW VARIABLES;
Variable_name	Value
auto_increment_increment	1
auto_increment_offset	1
autocommit	ON
automatic_sp_privileges	ON
avoid_temporal_upgrade	OFF
back_log	80
basedir	/usr/
big_tables	OFF
bind_address	198.255.6.10
binlog_cache_size	32768
binlog_checksum	CRC32
binlog_direct_non_transactional_updates	OFF
binlog_error_action	ABORT_SERVER
binlog_format	ROW
binlog_group_commit_sync_delay	0
binlog_group_commit_sync_no_delay_count	0
binlog_gtid_simple_recovery	ON
binlog_max_flush_queue_time	0
binlog_order_commits	ON
binlog_row_image	FULL
binlog_rows_query_log_events	OFF
binlog_stmt_cache_size	32768
binlog_transaction_dependency_history_size	25000
binlog_transaction_dependency_tracking	COMMIT_ORDER
block_encryption_mode	aes-128-ecb
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	latin1
character_set_system	utf8
character_sets_dir	/usr/share/mysql/charsets/
check_proxy_users	OFF
collation_connection	utf8_general_ci
collation_database	utf8_general_ci
collation_server	latin1_swedish_ci
completion_type	NO_CHAIN
concurrent_insert	AUTO
connect_timeout	10
core_file	OFF
datadir	/var/lib/mysql/
date_format	%Y-%m-%d
datetime_format	%Y-%m-%d %H:%i:%s
default_authentication_plugin	mysql_native_password
default_password_lifetime	0
default_storage_engine	InnoDB
default_tmp_storage_engine	InnoDB
default_week_format	0
delay_key_write	ON
delayed_insert_limit	100
delayed_insert_timeout	300
delayed_queue_size	1000
disabled_storage_engines	
disconnect_on_expired_password	ON
div_precision_increment	4
end_markers_in_json	OFF
enforce_gtid_consistency	OFF
eq_range_index_dive_limit	200
error_count	0
event_scheduler	OFF
expire_logs_days	10
explicit_defaults_for_timestamp	OFF
external_user	
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/LOS.log
group_concat_max_len	1024
gtid_executed_compression_period	1000
gtid_mode	OFF
gtid_next	AUTOMATIC
gtid_owned	
gtid_purged	
have_compress	YES
have_crypt	YES
have_dynamic_loading	YES
have_geometry	YES
have_openssl	DISABLED
have_profiling	YES
have_query_cache	YES
have_rtree_keys	YES
have_ssl	DISABLED
have_statement_timeout	YES
have_symlink	YES
host_cache_size	279
hostname	LOS
identity	0
ignore_builtin_innodb	OFF
ignore_db_dirs	
init_connect	
init_file	
init_slave	
innodb_adaptive_flushing	ON
innodb_adaptive_flushing_lwm	10
innodb_adaptive_hash_index	ON
innodb_adaptive_hash_index_parts	8
innodb_adaptive_max_sleep_delay	150000
innodb_api_bk_commit_interval	5
innodb_api_disable_rowlock	OFF
innodb_api_enable_binlog	OFF
innodb_api_enable_mdl	OFF
innodb_api_trx_level	0
innodb_autoextend_increment	64
innodb_autoinc_lock_mode	1
innodb_buffer_pool_chunk_size	134217728
innodb_buffer_pool_dump_at_shutdown	ON
innodb_buffer_pool_dump_now	OFF
innodb_buffer_pool_dump_pct	25
innodb_buffer_pool_filename	ib_buffer_pool
innodb_buffer_pool_instances	1
innodb_buffer_pool_load_abort	OFF
innodb_buffer_pool_load_at_startup	ON
innodb_buffer_pool_load_now	OFF
innodb_buffer_pool_size	134217728
innodb_change_buffer_max_size	25
innodb_change_buffering	all
innodb_checksum_algorithm	crc32
innodb_checksums	ON
innodb_cmp_per_index_enabled	OFF
innodb_commit_concurrency	0
innodb_compression_failure_threshold_pct	5
innodb_compression_level	6
innodb_compression_pad_pct_max	50
innodb_concurrency_tickets	5000
innodb_data_file_path	ibdata1:12M:autoextend
innodb_data_home_dir	
innodb_deadlock_detect	ON
innodb_default_row_format	dynamic
innodb_disable_sort_file_cache	OFF
innodb_doublewrite	ON
innodb_fast_shutdown	1
innodb_file_format	Barracuda
innodb_file_format_check	ON
innodb_file_format_max	Barracuda
innodb_file_per_table	ON
innodb_fill_factor	100
innodb_flush_log_at_timeout	1
innodb_flush_log_at_trx_commit	1
innodb_flush_method	
innodb_flush_neighbors	1
innodb_flush_sync	ON
innodb_flushing_avg_loops	30
innodb_force_load_corrupted	OFF
innodb_force_recovery	0
innodb_ft_aux_table	
innodb_ft_cache_size	8000000
innodb_ft_enable_diag_print	OFF
innodb_ft_enable_stopword	ON
innodb_ft_max_token_size	84
innodb_ft_min_token_size	3
innodb_ft_num_word_optimize	2000
innodb_ft_result_cache_limit	2000000000
innodb_ft_server_stopword_table	
innodb_ft_sort_pll_degree	2
innodb_ft_total_cache_size	640000000
innodb_ft_user_stopword_table	
innodb_io_capacity	200
innodb_io_capacity_max	2000
innodb_large_prefix	ON
innodb_lock_wait_timeout	50
innodb_locks_unsafe_for_binlog	OFF
innodb_log_buffer_size	16777216
innodb_log_checksums	ON
innodb_log_compressed_pages	ON
innodb_log_file_size	50331648
innodb_log_files_in_group	2
innodb_log_group_home_dir	./
innodb_log_write_ahead_size	8192
innodb_lru_scan_depth	1024
innodb_max_dirty_pages_pct	75.000000
innodb_max_dirty_pages_pct_lwm	0.000000
innodb_max_purge_lag	0
innodb_max_purge_lag_delay	0
innodb_max_undo_log_size	1073741824
innodb_monitor_disable	
innodb_monitor_enable	
innodb_monitor_reset	
innodb_monitor_reset_all	
innodb_numa_interleave	OFF
innodb_old_blocks_pct	37
innodb_old_blocks_time	1000
innodb_online_alter_log_max_size	134217728
innodb_open_files	431
innodb_optimize_fulltext_only	OFF
innodb_page_cleaners	1
innodb_page_size	16384
innodb_print_all_deadlocks	OFF
innodb_purge_batch_size	300
innodb_purge_rseg_truncate_frequency	128
innodb_purge_threads	4
innodb_random_read_ahead	OFF
innodb_read_ahead_threshold	56
innodb_read_io_threads	4
innodb_read_only	OFF
innodb_replication_delay	0
innodb_rollback_on_timeout	OFF
innodb_rollback_segments	128
innodb_sort_buffer_size	1048576
innodb_spin_wait_delay	6
innodb_stats_auto_recalc	ON
innodb_stats_include_delete_marked	OFF
innodb_stats_method	nulls_equal
innodb_stats_on_metadata	OFF
innodb_stats_persistent	ON
innodb_stats_persistent_sample_pages	20
innodb_stats_sample_pages	8
innodb_stats_transient_sample_pages	8
innodb_status_output	OFF
innodb_status_output_locks	OFF
innodb_strict_mode	ON
innodb_support_xa	ON
innodb_sync_array_size	1
innodb_sync_spin_loops	30
innodb_table_locks	ON
innodb_temp_data_file_path	ibtmp1:12M:autoextend
innodb_thread_concurrency	0
innodb_thread_sleep_delay	10000
innodb_tmpdir	
innodb_undo_directory	./
innodb_undo_log_truncate	OFF
innodb_undo_logs	128
innodb_undo_tablespaces	0
innodb_use_native_aio	ON
innodb_version	5.7.27
innodb_write_io_threads	4
insert_id	0
interactive_timeout	28800
internal_tmp_disk_storage_engine	InnoDB
join_buffer_size	262144
keep_files_on_create	OFF
key_buffer_size	16777216
key_cache_age_threshold	300
key_cache_block_size	1024
key_cache_division_limit	100
keyring_operations	ON
large_files_support	ON
large_page_size	0
large_pages	OFF
last_insert_id	0
lc_messages	en_US
lc_messages_dir	/usr/share/mysql/
lc_time_names	en_US
license	GPL
local_infile	ON
lock_wait_timeout	31536000
locked_in_memory	OFF
log_bin	OFF
log_bin_basename	
log_bin_index	
log_bin_trust_function_creators	OFF
log_bin_use_v1_row_events	OFF
log_builtin_as_identified_by_password	OFF
log_error	/var/log/mysql/error.log
log_error_verbosity	3
log_output	FILE
log_queries_not_using_indexes	OFF
log_slave_updates	OFF
log_slow_admin_statements	OFF
log_slow_slave_statements	OFF
log_statements_unsafe_for_binlog	ON
log_syslog	OFF
log_syslog_facility	daemon
log_syslog_include_pid	ON
log_syslog_tag	
log_throttle_queries_not_using_indexes	0
log_timestamps	UTC
log_warnings	2
long_query_time	10.000000
low_priority_updates	OFF
lower_case_file_system	OFF
lower_case_table_names	0
master_info_repository	FILE
master_verify_checksum	OFF
max_allowed_packet	16777216
max_binlog_cache_size	18446744073709547520
max_binlog_size	104857600
max_binlog_stmt_cache_size	18446744073709547520
max_connect_errors	100
max_connections	151
max_delayed_threads	20
max_digest_length	1024
max_error_count	64
max_execution_time	0
max_heap_table_size	16777216
max_insert_delayed_threads	20
max_join_size	18446744073709551615
max_length_for_sort_data	1024
max_points_in_geometry	65536
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	32
max_user_connections	0
max_write_lock_count	18446744073709551615
metadata_locks_cache_size	1024
metadata_locks_hash_instances	8
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	BACKUP
myisam_repair_threads	1
myisam_sort_buffer_size	8388608
myisam_stats_method	nulls_unequal
myisam_use_mmap	OFF
mysql_native_password_proxy_users	OFF
net_buffer_length	16384
net_read_timeout	30
net_retry_count	10
net_write_timeout	60
new	OFF
ngram_token_size	2
offline_mode	OFF
old	OFF
old_alter_table	OFF
old_passwords	0
open_files_limit	1024
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,engine_condition_pushdown=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=on,block_nested_loop=on,batched_key_access=off,materialization=on,semijoin=on,loosescan=on,firstmatch=on,duplicateweedout=on,subquery_materialization_cost_based=on,use_index_extensions=on,condition_fanout_filter=on,derived_merge=on
optimizer_trace	enabled=off,one_line=off
optimizer_trace_features	greedy_search=on,range_optimizer=on,dynamic_range=on,repeated_subselect=on
optimizer_trace_limit	1
optimizer_trace_max_mem_size	16384
optimizer_trace_offset	-1
parser_max_mem_size	18446744073709551615
performance_schema	ON
performance_schema_accounts_size	-1
performance_schema_digests_size	5000
performance_schema_events_stages_history_long_size	1000
performance_schema_events_stages_history_size	10
performance_schema_events_statements_history_long_size	1000
performance_schema_events_statements_history_size	10
performance_schema_events_transactions_history_long_size	1000
performance_schema_events_transactions_history_size	10
performance_schema_events_waits_history_long_size	1000
performance_schema_events_waits_history_size	10
performance_schema_hosts_size	-1
performance_schema_max_cond_classes	80
performance_schema_max_cond_instances	-1
performance_schema_max_digest_length	1024
performance_schema_max_file_classes	80
performance_schema_max_file_handles	32768
performance_schema_max_file_instances	-1
performance_schema_max_index_stat	-1
performance_schema_max_memory_classes	320
performance_schema_max_metadata_locks	-1
performance_schema_max_mutex_classes	210
performance_schema_max_mutex_instances	-1
performance_schema_max_prepared_statements_instances	-1
performance_schema_max_program_instances	-1
performance_schema_max_rwlock_classes	50
performance_schema_max_rwlock_instances	-1
performance_schema_max_socket_classes	10
performance_schema_max_socket_instances	-1
performance_schema_max_sql_text_length	1024
performance_schema_max_stage_classes	150
performance_schema_max_statement_classes	193
performance_schema_max_statement_stack	10
performance_schema_max_table_handles	-1
performance_schema_max_table_instances	-1
performance_schema_max_table_lock_stat	-1
performance_schema_max_thread_classes	50
performance_schema_max_thread_instances	-1
performance_schema_session_connect_attrs_size	512
performance_schema_setup_actors_size	-1
performance_schema_setup_objects_size	-1
performance_schema_users_size	-1
pid_file	/var/run/mysqld/mysqld.pid
plugin_dir	/usr/lib/mysql/plugin/
port	3306
preload_buffer_size	32768
profiling	OFF
profiling_history_size	15
protocol_version	10
proxy_user	
pseudo_slave_mode	OFF
pseudo_thread_id	44
query_alloc_block_size	8192
query_cache_limit	1048576
query_cache_min_res_unit	4096
query_cache_size	16777216
query_cache_type	OFF
query_cache_wlock_invalidate	OFF
query_prealloc_size	8192
rand_seed1	0
rand_seed2	0
range_alloc_block_size	4096
range_optimizer_max_mem_size	8388608
rbr_exec_mode	STRICT
read_buffer_size	131072
read_only	OFF
read_rnd_buffer_size	262144
relay_log	
relay_log_basename	/var/lib/mysql/LOS-relay-bin
relay_log_index	/var/lib/mysql/LOS-relay-bin.index
relay_log_info_file	relay-log.info
relay_log_info_repository	FILE
relay_log_purge	ON
relay_log_recovery	OFF
relay_log_space_limit	0
report_host	
report_password	
report_port	3306
report_user	
require_secure_transport	OFF
rpl_stop_slave_timeout	31536000
secure_auth	ON
secure_file_priv	/var/lib/mysql-files/
server_id	0
server_id_bits	32
server_uuid	4a2d93c6-0f5c-11e9-9a96-60eb6908b954
session_track_gtids	OFF
session_track_schema	ON
session_track_state_change	OFF
session_track_system_variables	time_zone,autocommit,character_set_client,character_set_results,character_set_connection
session_track_transaction_info	OFF
sha256_password_proxy_users	OFF
show_compatibility_56	OFF
show_create_table_verbosity	OFF
show_old_temporals	OFF
skip_external_locking	ON
skip_name_resolve	ON
skip_networking	OFF
skip_show_database	OFF
slave_allow_batching	OFF
slave_checkpoint_group	512
slave_checkpoint_period	300
slave_compressed_protocol	OFF
slave_exec_mode	STRICT
slave_load_tmpdir	/tmp
slave_max_allowed_packet	1073741824
slave_net_timeout	60
slave_parallel_type	DATABASE
slave_parallel_workers	0
slave_pending_jobs_size_max	16777216
slave_preserve_commit_order	OFF
slave_rows_search_algorithms	TABLE_SCAN,INDEX_SCAN
slave_skip_errors	OFF
slave_sql_verify_checksum	ON
slave_transaction_retries	10
slave_type_conversions	
slow_launch_time	2
slow_query_log	OFF
slow_query_log_file	/var/lib/mysql/LOS-slow.log
socket	/var/run/mysqld/mysqld.sock
sort_buffer_size	262144
sql_auto_is_null	OFF
sql_big_selects	ON
sql_buffer_result	OFF
sql_log_bin	ON
sql_log_off	OFF
sql_mode	
sql_notes	ON
sql_quote_show_create	ON
sql_safe_updates	OFF
sql_select_limit	18446744073709551615
sql_slave_skip_counter	0
sql_warnings	OFF
ssl_ca	
ssl_capath	
ssl_cert	
ssl_cipher	
ssl_crl	
ssl_crlpath	
ssl_key	
stored_program_cache	256
super_read_only	OFF
sync_binlog	1
sync_frm	ON
sync_master_info	10000
sync_relay_log	10000
sync_relay_log_info	10000
system_time_zone	PDT
table_definition_cache	615
table_open_cache	431
table_open_cache_instances	16
thread_cache_size	8
thread_handling	one-thread-per-connection
thread_stack	196608
time_format	%H:%i:%s
time_zone	SYSTEM
timestamp	1568617966.439652
tls_version	TLSv1,TLSv1.1
tmp_table_size	16777216
tmpdir	/tmp
transaction_alloc_block_size	8192
transaction_allow_batching	OFF
transaction_isolation	REPEATABLE-READ
transaction_prealloc_size	4096
transaction_read_only	OFF
transaction_write_set_extraction	OFF
tx_isolation	REPEATABLE-READ
tx_read_only	OFF
unique_checks	ON
updatable_views_with_limit	YES
version	5.7.27-0ubuntu0.16.04.1
version_comment	(Ubuntu)
version_compile_machine	x86_64
version_compile_os	Linux
wait_timeout	28800
warning_count	0
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