mysql配置文件官方地址如下：https://dev.mysql.com/doc/refman/5.6/en/option-files.html
mysql读取配置文件的先后顺序如下：
| File Name | Purpose |
|---|---|
/etc/my.cnf |
Global options |
/etc/mysql/my.cnf |
Global options |
|
Global options |
$MYSQL_HOME/my.cnf |
Server-specific options (server only) |
defaults-extra-file |
The file specified with --defaults-extra-file, if any |
~/.my.cnf |
User-specific options |
~/.mylogin.cnf |
User-specific login path options (clients only) |
SYSCONFDIR
$MYSQL_HOME 是环境变量设置的，如果没有设置，就采用其他的策略
凡是能通过命令行传递的参数，都可以通过配置文件进行配置。查看命令行参数命令如下：
mysqld --verbose --help 或者 mysqladmin variables
my.cnf文件语法如下：
1、空行被忽略
2、[group] 分组的开始，分组的结束为下一个分组的开始
3、opt_name 变量
4、opt_name=XXX 如同命令行参数和值
配置文件中的转译特殊字符，大小写敏感，具体如下：
| \b | backspace | |
| \t | tab | |
| \n | newline | |
| \r | carriage return | |
| \\ | backslash | |
| \s | space | 空格 |
[group] 目前包括如下：
mysqld 针对mysql server程序的配置
mysql 针对mysql客户端的配置
client 针对mysql所有客户端的配置
mysqldump 针对dump程序的配置
mysqlhotcopy 热cp
mysqladmin 管理程序配置
优化方面，我们主要是针对[mysqld]配置，其他的这里暂不处理。
mysqld可配置的变量如下：
Table 5.3 System Variable Summary
| Name | Cmd-Line | Option File | System Var | Var Scope | Dynamic |
|---|---|---|---|---|---|
| audit_log_buffer_size | Yes | Yes | Yes | Global | No |
| audit_log_connection_policy | Yes | Yes | Yes | Global | Yes |
| audit_log_current_session | Yes | Both | No | ||
| audit_log_exclude_accounts | Yes | Yes | Yes | Global | Yes |
| audit_log_file | Yes | Yes | Yes | Global | No |
| audit_log_flush | Yes | Global | Yes | ||
| audit_log_format | Yes | Yes | Yes | Global | No |
| audit_log_include_accounts | Yes | Yes | Yes | Global | Yes |
| audit_log_policy | Yes | Yes | Yes | Global | Varies |
| audit_log_rotate_on_size | Yes | Yes | Yes | Global | Yes |
| audit_log_statement_policy | Yes | Yes | Yes | Global | Yes |
| audit_log_strategy | Yes | Yes | Yes | Global | No |
| auto_increment_increment | Yes | Both | Yes | ||
| auto_increment_offset | Yes | Both | Yes | ||
| autocommit | Yes | Yes | Yes | Both | Yes |
| automatic_sp_privileges | Yes | Global | Yes | ||
| avoid_temporal_upgrade | Yes | Yes | Yes | Global | Yes |
| back_log | Yes | Global | No | ||
| basedir | Yes | Yes | Yes | Global | No |
| big-tables | Yes | Yes | Yes | ||
| - Variable: big_tables | Yes | Both | Yes | ||
| bind-address | Yes | Yes | No | ||
| - Variable: bind_address | Yes | Global | No | ||
| binlog_cache_size | Yes | Yes | Yes | Global | Yes |
| binlog_checksum | Yes | Global | Yes | ||
| binlog_direct_non_transactional_updates | Yes | Yes | Yes | Both | Yes |
| binlog_error_action | Yes | Yes | Yes | Global | Yes |
| binlog-format | Yes | Yes | Yes | ||
| - Variable: binlog_format | Yes | Both | Yes | ||
| binlog_gtid_simple_recovery | Yes | Yes | Yes | Global | No |
| binlog_max_flush_queue_time | Yes | Global | Yes | ||
| binlog_order_commits | Yes | Global | Yes | ||
| binlog_row_image | Yes | Yes | Yes | Both | Yes |
| binlog_rows_query_log_events | Yes | Yes | Yes | Both | Yes |
| binlog_stmt_cache_size | Yes | Yes | Yes | Global | Yes |
| binlogging_impossible_mode | Yes | Yes | Yes | Both | Yes |
| block_encryption_mode | Yes | Yes | Yes | Both | Yes |
| bulk_insert_buffer_size | Yes | Yes | Yes | Both | Yes |
| character_set_client | Yes | Both | Yes | ||
| character_set_connection | Yes | Both | Yes | ||
| character_set_database (note 1) | Yes | Both | Yes | ||
| character-set-filesystem | Yes | Yes | Yes | ||
| - Variable: character_set_filesystem | Yes | Both | Yes | ||
| character_set_results | Yes | Both | Yes | ||
| character-set-server | Yes | Yes | Yes | ||
| - Variable: character_set_server | Yes | Both | Yes | ||
| character_set_system | Yes | Global | No | ||
| character-sets-dir | Yes | Yes | No | ||
| - Variable: character_sets_dir | Yes | Global | No | ||
| collation_connection | Yes | Both | Yes | ||
| collation_database (note 1) | Yes | Both | Yes | ||
| collation-server | Yes | Yes | Yes | ||
| - Variable: collation_server | Yes | Both | Yes | ||
| completion_type | Yes | Yes | Yes | Both | Yes |
| concurrent_insert | Yes | Yes | Yes | Global | Yes |
| connect_timeout | Yes | Yes | Yes | Global | Yes |
| connection_control_failed_connections_threshold | Yes | Yes | Yes | Global | Yes |
| connection_control_max_connection_delay | Yes | Yes | Yes | Global | Yes |
| connection_control_min_connection_delay | Yes | Yes | Yes | Global | Yes |
| core_file | Yes | Global | No | ||
| create_old_temporals | Yes | Yes | Yes | Global | No |
| daemon_memcached_enable_binlog | Yes | Yes | Yes | Global | No |
| daemon_memcached_engine_lib_name | Yes | Yes | Yes | Global | No |
| daemon_memcached_engine_lib_path | Yes | Yes | Yes | Global | No |
| daemon_memcached_option | Yes | Yes | Yes | Global | No |
| daemon_memcached_r_batch_size | Yes | Yes | Yes | Global | No |
| daemon_memcached_w_batch_size | Yes | Yes | Yes | Global | No |
| datadir | Yes | Yes | Yes | Global | No |
| date_format | Yes | Global | No | ||
| datetime_format | Yes | Global | No | ||
| debug | Yes | Yes | Yes | Both | Yes |
| debug_sync | Yes | Session | Yes | ||
| default-storage-engine | Yes | Yes | Yes | ||
| - Variable: default_storage_engine | Yes | Both | Yes | ||
| default_tmp_storage_engine | Yes | Yes | Yes | Both | Yes |
| default_week_format | Yes | Yes | Yes | Both | Yes |
| delay-key-write | Yes | Yes | Yes | ||
| - Variable: delay_key_write | Yes | Global | Yes | ||
| delayed_insert_limit | Yes | Yes | Yes | Global | Yes |
| delayed_insert_timeout | Yes | Yes | Yes | Global | Yes |
| delayed_queue_size | Yes | Yes | Yes | Global | Yes |
| disable-gtid-unsafe-statements | Yes | Yes | Yes | Global | No |
| disable_gtid_unsafe_statements | Yes | Yes | Yes | Global | No |
| disconnect_on_expired_password | Yes | Yes | Yes | Session | No |
| div_precision_increment | Yes | Yes | Yes | Both | Yes |
| end_markers_in_json | Yes | Both | Yes | ||
| enforce-gtid-consistency | Yes | Yes | Yes | Global | No |
| enforce_gtid_consistency | Yes | Yes | Yes | Global | No |
| engine-condition-pushdown | Yes | Yes | Yes | ||
| - Variable: engine_condition_pushdown | Yes | Both | Yes | ||
| eq_range_index_dive_limit | Yes | Both | Yes | ||
| error_count | Yes | Session | No | ||
| event-scheduler | Yes | Yes | Yes | ||
| - Variable: event_scheduler | Yes | Global | Yes | ||
| expire_logs_days | Yes | Yes | Yes | Global | Yes |
| explicit_defaults_for_timestamp | Yes | Yes | Yes | Both | Yes |
| external_user | Yes | Session | No | ||
| flush | Yes | Yes | Yes | Global | Yes |
| flush_time | Yes | Yes | Yes | Global | Yes |
| foreign_key_checks | Yes | Both | Yes | ||
| ft_boolean_syntax | Yes | Yes | Yes | Global | Yes |
| ft_max_word_len | Yes | Yes | Yes | Global | No |
| ft_min_word_len | Yes | Yes | Yes | Global | No |
| ft_query_expansion_limit | Yes | Yes | Yes | Global | No |
| ft_stopword_file | Yes | Yes | Yes | Global | No |
| general-log | Yes | Yes | Yes | ||
| - Variable: general_log | Yes | Global | Yes | ||
| general_log_file | Yes | Yes | Yes | Global | Yes |
| group_concat_max_len | Yes | Yes | Yes | Both | Yes |
| gtid_done | Yes | Both | No | ||
| gtid_executed | Yes | Both | No | ||
| gtid_lost | Yes | Global | No | ||
| gtid-mode | Yes | Yes | No | ||
| - Variable: gtid_mode | Yes | Global | No | ||
| gtid_mode | Yes | Global | No | ||
| gtid_next | Yes | Session | Yes | ||
| gtid_owned | Yes | Both | No | ||
| gtid_purged | Yes | Global | Yes | ||
| have_compress | Yes | Global | No | ||
| have_crypt | Yes | Global | No | ||
| have_csv | Yes | Global | No | ||
| have_dynamic_loading | Yes | Global | No | ||
| have_geometry | Yes | Global | No | ||
| have_innodb | Yes | Global | No | ||
| have_ndbcluster | Yes | Global | No | ||
| have_openssl | Yes | Global | No | ||
| have_partitioning | Yes | Global | No | ||
| have_profiling | Yes | Global | No | ||
| have_query_cache | Yes | Global | No | ||
| have_rtree_keys | Yes | Global | No | ||
| have_ssl | Yes | Global | No | ||
| have_symlink | Yes | Global | No | ||
| host_cache_size | Yes | Global | Yes | ||
| hostname | Yes | Global | No | ||
| identity | Yes | Session | Yes | ||
| ignore-builtin-innodb | Yes | Yes | No | ||
| - Variable: ignore_builtin_innodb | Yes | Global | No | ||
| ignore_db_dirs | Yes | Global | No | ||
| init_connect | Yes | Yes | Yes | Global | Yes |
| init-file | Yes | Yes | No | ||
| - Variable: init_file | Yes | Global | No | ||
| init_slave | Yes | Yes | Yes | Global | Yes |
| innodb_adaptive_flushing | Yes | Yes | Yes | Global | Yes |
| innodb_adaptive_flushing_lwm | Yes | Yes | Yes | Global | Yes |
| innodb_adaptive_hash_index | Yes | Yes | Yes | Global | Yes |
| innodb_adaptive_max_sleep_delay | Yes | Yes | Yes | Global | Yes |
| innodb_additional_mem_pool_size | Yes | Yes | Yes | Global | No |
| innodb_api_bk_commit_interval | Yes | Yes | Yes | Global | Yes |
| innodb_api_disable_rowlock | Yes | Yes | Yes | Global | No |
| innodb_api_enable_binlog | Yes | Yes | Yes | Global | No |
| innodb_api_enable_mdl | Yes | Yes | Yes | Global | No |
| innodb_api_trx_level | Yes | Yes | Yes | Global | Yes |
| innodb_autoextend_increment | Yes | Yes | Yes | Global | Yes |
| innodb_autoinc_lock_mode | Yes | Yes | Yes | Global | No |
| innodb_buffer_pool_dump_at_shutdown | Yes | Yes | Yes | Global | Yes |
| innodb_buffer_pool_dump_now | Yes | Yes | Yes | Global | Yes |
| innodb_buffer_pool_filename | Yes | Yes | Yes | Global | Yes |
| innodb_buffer_pool_instances | Yes | Yes | Yes | Global | No |
| innodb_buffer_pool_load_abort | Yes | Yes | Yes | Global | Yes |
| innodb_buffer_pool_load_at_startup | Yes | Yes | Yes | Global | No |
| innodb_buffer_pool_load_now | Yes | Yes | Yes | Global | Yes |
| innodb_buffer_pool_size | Yes | Yes | Yes | Global | No |
| innodb_change_buffer_max_size | Yes | Yes | Yes | Global | Yes |
| innodb_change_buffering | Yes | Yes | Yes | Global | Yes |
| innodb_change_buffering_debug | Yes | Yes | Yes | Global | Yes |
| innodb_checksum_algorithm | Yes | Yes | Yes | Global | Yes |
| innodb_checksums | Yes | Yes | Yes | Global | No |
| innodb_cmp_per_index_enabled | Yes | Yes | Yes | Global | Yes |
| innodb_commit_concurrency | Yes | Yes | Yes | Global | Yes |
| innodb_compression_failure_threshold_pct | Yes | Yes | Yes | Global | Yes |
| innodb_compression_level | Yes | Yes | Yes | Global | Yes |
| innodb_compression_pad_pct_max | Yes | Yes | Yes | Global | Yes |
| innodb_concurrency_tickets | Yes | Yes | Yes | Global | Yes |
| innodb_data_file_path | Yes | Yes | Yes | Global | No |
| innodb_data_home_dir | Yes | Yes | Yes | Global | No |
| innodb_disable_sort_file_cache | Yes | Yes | Yes | Global | Yes |
| innodb_doublewrite | Yes | Yes | Yes | Global | No |
| innodb_fast_shutdown | Yes | Yes | Yes | Global | Yes |
| innodb_fil_make_page_dirty_debug | Yes | Yes | Yes | Global | Yes |
| innodb_file_format | Yes | Yes | Yes | Global | Yes |
| innodb_file_format_check | Yes | Yes | Yes | Global | No |
| innodb_file_format_max | Yes | Yes | Yes | Global | Yes |
| innodb_file_per_table | Yes | Yes | Yes | Global | Yes |
| innodb_flush_log_at_timeout | Yes | Global | Yes | ||
| innodb_flush_log_at_trx_commit | Yes | Yes | Yes | Global | Yes |
| innodb_flush_method | Yes | Yes | Yes | Global | No |
| innodb_flush_neighbors | Yes | Yes | Yes | Global | Yes |
| innodb_flushing_avg_loops | Yes | Yes | Yes | Global | Yes |
| innodb_force_load_corrupted | Yes | Yes | Yes | Global | No |
| innodb_force_recovery | Yes | Yes | Yes | Global | No |
| innodb_ft_aux_table | Yes | Global | Yes | ||
| innodb_ft_cache_size | Yes | Yes | Yes | Global | No |
| innodb_ft_enable_diag_print | Yes | Yes | Yes | Global | Yes |
| innodb_ft_enable_stopword | Yes | Yes | Yes | Global | Yes |
| innodb_ft_max_token_size | Yes | Yes | Yes | Global | No |
| innodb_ft_min_token_size | Yes | Yes | Yes | Global | No |
| innodb_ft_num_word_optimize | Yes | Yes | Yes | Global | Yes |
| innodb_ft_result_cache_limit | Yes | Yes | Yes | Global | Yes |
| innodb_ft_server_stopword_table | Yes | Yes | Yes | Global | Yes |
| innodb_ft_sort_pll_degree | Yes | Yes | Yes | Global | No |
| innodb_ft_total_cache_size | Yes | Yes | Yes | Global | No |
| innodb_ft_user_stopword_table | Yes | Yes | Yes | Both | Yes |
| innodb_io_capacity | Yes | Yes | Yes | Global | Yes |
| innodb_io_capacity_max | Yes | Yes | Yes | Global | Yes |
| innodb_large_prefix | Yes | Yes | Yes | Global | Yes |
| innodb_limit_optimistic_insert_debug | Yes | Yes | Yes | Global | Yes |
| innodb_lock_wait_timeout | Yes | Yes | Yes | Both | Yes |
| innodb_locks_unsafe_for_binlog | Yes | Yes | Yes | Global | No |
| innodb_log_buffer_size | Yes | Yes | Yes | Global | No |
| innodb_log_compressed_pages | Yes | Yes | Yes | Global | Yes |
| innodb_log_file_size | Yes | Yes | Yes | Global | No |
| innodb_log_files_in_group | Yes | Yes | Yes | Global | No |
| innodb_log_group_home_dir | Yes | Yes | Yes | Global | No |
| innodb_lru_scan_depth | Yes | Yes | Yes | Global | Yes |
| innodb_max_dirty_pages_pct | Yes | Yes | Yes | Global | Yes |
| innodb_max_dirty_pages_pct_lwm | Yes | Yes | Yes | Global | Yes |
| innodb_max_purge_lag | Yes | Yes | Yes | Global | Yes |
| innodb_max_purge_lag_delay | Yes | Yes | Yes | Global | Yes |
| innodb_mirrored_log_groups | Yes | Yes | Yes | Global | No |
| innodb_monitor_disable | Yes | Yes | Yes | Global | Yes |
| innodb_monitor_enable | Yes | Yes | Yes | Global | Yes |
| innodb_monitor_reset | Yes | Yes | Yes | Global | Yes |
| innodb_monitor_reset_all | Yes | Yes | Yes | Global | Yes |
| innodb_numa_interleave | Yes | Yes | Yes | Global | No |
| innodb_old_blocks_pct | Yes | Yes | Yes | Global | Yes |
| innodb_old_blocks_time | Yes | Yes | Yes | Global | Yes |
| innodb_online_alter_log_max_size | Yes | Yes | Yes | Global | Yes |
| innodb_open_files | Yes | Yes | Yes | Global | No |
| innodb_optimize_fulltext_only | Yes | Yes | Yes | Global | Yes |
| innodb_page_size | Yes | Yes | Yes | Global | No |
| innodb_print_all_deadlocks | Yes | Yes | Yes | Global | Yes |
| innodb_purge_batch_size | Yes | Yes | Yes | Global | Yes |
| innodb_purge_threads | Yes | Yes | Yes | Global | No |
| innodb_random_read_ahead | Yes | Yes | Yes | Global | Yes |
| innodb_read_ahead_threshold | Yes | Yes | Yes | Global | Yes |
| innodb_read_io_threads | Yes | Yes | Yes | Global | No |
| innodb_read_only | Yes | Yes | Yes | Global | No |
| innodb_replication_delay | Yes | Yes | Yes | Global | Yes |
| innodb_rollback_on_timeout | Yes | Yes | Yes | Global | No |
| innodb_rollback_segments | Yes | Yes | Yes | Global | Yes |
| innodb_saved_page_number_debug | Yes | Yes | Yes | Global | Yes |
| innodb_sort_buffer_size | Yes | Yes | Yes | Global | No |
| innodb_spin_wait_delay | Yes | Yes | Yes | Global | Yes |
| innodb_stats_auto_recalc | Yes | Yes | Yes | Global | Yes |
| innodb_stats_include_delete_marked | Yes | Yes | Yes | Global | Yes |
| innodb_stats_method | Yes | Yes | Yes | Global | Yes |
| innodb_stats_on_metadata | Yes | Yes | Yes | Global | Yes |
| innodb_stats_persistent | Yes | Yes | Yes | Global | Yes |
| innodb_stats_persistent_sample_pages | Yes | Yes | Yes | Global | Yes |
| innodb_stats_sample_pages | Yes | Yes | Yes | Global | Yes |
| innodb_stats_transient_sample_pages | Yes | Yes | Yes | Global | Yes |
| innodb_status_output | Yes | Yes | Yes | Global | Yes |
| innodb_status_output_locks | Yes | Yes | Yes | Global | Yes |
| innodb_strict_mode | Yes | Yes | Yes | Both | Yes |
| innodb_support_xa | Yes | Yes | Yes | Both | Yes |
| innodb_sync_array_size | Yes | Yes | Yes | Global | No |
| innodb_sync_spin_loops | Yes | Yes | Yes | Global | Yes |
| innodb_table_locks | Yes | Yes | Yes | Both | Yes |
| innodb_thread_concurrency | Yes | Yes | Yes | Global | Yes |
| innodb_thread_sleep_delay | Yes | Yes | Yes | Global | Yes |
| innodb_tmpdir | Yes | Yes | Yes | Both | Yes |
| innodb_trx_purge_view_update_only_debug | Yes | Yes | Yes | Global | Yes |
| innodb_trx_rseg_n_slots_debug | Yes | Yes | Yes | Global | Yes |
| innodb_undo_directory | Yes | Yes | Yes | Global | No |
| innodb_undo_logs | Yes | Yes | Yes | Global | Yes |
| innodb_undo_tablespaces | Yes | Yes | Yes | Global | No |
| innodb_use_native_aio | Yes | Yes | Yes | Global | No |
| innodb_use_sys_malloc | Yes | Yes | Yes | Global | No |
| innodb_version | Yes | Global | No | ||
| innodb_write_io_threads | Yes | Yes | Yes | Global | No |
| insert_id | Yes | Session | Yes | ||
| interactive_timeout | Yes | Yes | Yes | Both | Yes |
| join_buffer_size | Yes | Yes | Yes | Both | Yes |
| keep_files_on_create | Yes | Yes | Yes | Both | Yes |
| key_buffer_size | Yes | Yes | Yes | Global | Yes |
| key_cache_age_threshold | Yes | Yes | Yes | Global | Yes |
| key_cache_block_size | Yes | Yes | Yes | Global | Yes |
| key_cache_division_limit | Yes | Yes | Yes | Global | Yes |
| language | Yes | Yes | Yes | Global | No |
| large_files_support | Yes | Global | No | ||
| large_page_size | Yes | Global | No | ||
| large-pages | Yes | Yes | No | ||
| - Variable: large_pages | Yes | Global | No | ||
| last_insert_id | Yes | Session | Yes | ||
| lc-messages | Yes | Yes | Yes | ||
| - Variable: lc_messages | Yes | Both | Yes | ||
| lc-messages-dir | Yes | Yes | No | ||
| - Variable: lc_messages_dir | Yes | Global | No | ||
| lc_time_names | Yes | Both | Yes | ||
| license | Yes | Global | No | ||
| local_infile | Yes | Global | Yes | ||
| lock_wait_timeout | Yes | Yes | Yes | Both | Yes |
| locked_in_memory | Yes | Global | No | ||
| log | Yes | Yes | Yes | Global | Yes |
| log-bin | Yes | Yes | Yes | Global | No |
| log_bin | Yes | Global | No | ||
| log_bin_basename | Yes | Global | No | ||
| log_bin_index | Yes | Global | No | ||
| log-bin-trust-function-creators | Yes | Yes | Yes | ||
| - Variable: log_bin_trust_function_creators | Yes | Global | Yes | ||
| log-bin-use-v1-row-events | Yes | Yes | No | ||
| - Variable: log_bin_use_v1_row_events | Yes | Global | No | ||
| log_bin_use_v1_row_events | Yes | Yes | Yes | Global | No |
| log-error | Yes | Yes | No | ||
| - Variable: log_error | Yes | Global | No | ||
| log-output | Yes | Yes | Yes | ||
| - Variable: log_output | Yes | Global | Yes | ||
| log-queries-not-using-indexes | Yes | Yes | Yes | ||
| - Variable: log_queries_not_using_indexes | Yes | Global | Yes | ||
| log-slave-updates | Yes | Yes | No | ||
| - Variable: log_slave_updates | Yes | Global | No | ||
| log_slave_updates | Yes | Yes | Yes | Global | No |
| log_slow_admin_statements | Yes | Global | Yes | ||
| log-slow-queries | Yes | Yes | Yes | ||
| - Variable: log_slow_queries | Yes | Global | Yes | ||
| log_slow_slave_statements | Yes | Global | Yes | ||
| log_throttle_queries_not_using_indexes | Yes | Global | Yes | ||
| log-warnings | Yes | Yes | Yes | ||
| - Variable: log_warnings | Yes | Varies | Yes | ||
| long_query_time | Yes | Yes | Yes | Both | Yes |
| low-priority-updates | Yes | Yes | Yes | ||
| - Variable: low_priority_updates | Yes | Both | Yes | ||
| lower_case_file_system | Yes | Global | No | ||
| lower_case_table_names | Yes | Yes | Yes | Global | No |
| master_info_repository | Yes | Yes | Yes | Global | Yes |
| master_verify_checksum | Yes | Global | Yes | ||
| max_allowed_packet | Yes | Yes | Yes | Both | Yes |
| max_binlog_cache_size | Yes | Yes | Yes | Global | Yes |
| max_binlog_size | Yes | Yes | Yes | Global | Yes |
| max_binlog_stmt_cache_size | Yes | Yes | Yes | Global | Yes |
| max_connect_errors | Yes | Yes | Yes | Global | Yes |
| max_connections | Yes | Yes | Yes | Global | Yes |
| max_delayed_threads | Yes | Yes | Yes | Both | Yes |
| max_digest_length | Yes | Yes | Yes | Global | No |
| max_error_count | Yes | Yes | Yes | Both | Yes |
| max_heap_table_size | Yes | Yes | Yes | Both | Yes |
| max_insert_delayed_threads | Yes | Both | Yes | ||
| max_join_size | Yes | Yes | Yes | Both | Yes |
| max_length_for_sort_data | Yes | Yes | Yes | Both | Yes |
| max_prepared_stmt_count | Yes | Yes | Yes | Global | Yes |
| max_relay_log_size | Yes | Yes | Yes | Global | Yes |
| max_seeks_for_key | Yes | Yes | Yes | Both | Yes |
| max_sort_length | Yes | Yes | Yes | Both | Yes |
| max_sp_recursion_depth | Yes | Yes | Yes | Both | Yes |
| max_tmp_tables | Yes | Both | Yes | ||
| max_user_connections | Yes | Yes | Yes | Both | Yes |
| max_write_lock_count | Yes | Yes | Yes | Global | Yes |
| metadata_locks_cache_size | Yes | Global | No | ||
| metadata_locks_hash_instances | Yes | Global | No | ||
| min-examined-row-limit | Yes | Yes | Yes | Both | Yes |
| multi_range_count | Yes | Yes | Yes | Both | Yes |
| myisam_data_pointer_size | Yes | Yes | Yes | Global | Yes |
| myisam_max_sort_file_size | Yes | Yes | Yes | Global | Yes |
| myisam_mmap_size | Yes | Yes | Yes | Global | No |
| myisam_recover_options | Yes | Global | No | ||
| myisam_repair_threads | Yes | Yes | Yes | Both | Yes |
| myisam_sort_buffer_size | Yes | Yes | Yes | Both | Yes |
| myisam_stats_method | Yes | Yes | Yes | Both | Yes |
| myisam_use_mmap | Yes | Yes | Yes | Global | Yes |
| mysql_firewall_max_query_size | Yes | Yes | Yes | Global | No |
| mysql_firewall_mode | Yes | Yes | Yes | Global | Yes |
| mysql_firewall_trace | Yes | Yes | Yes | Global | Yes |
| named_pipe | Yes | Global | No | ||
| ndb_autoincrement_prefetch_sz | Yes | Yes | Yes | Both | Yes |
| ndb-batch-size | Yes | Yes | Yes | Global | No |
| ndb-blob-read-batch-bytes | Yes | Yes | Yes | Both | Yes |
| ndb-blob-write-batch-bytes | Yes | Yes | Yes | Both | Yes |
| ndb_cache_check_time | Yes | Yes | Yes | Global | Yes |
| ndb_clear_apply_status | Yes | Yes | Global | Yes | |
| ndb-cluster-connection-pool | Yes | Yes | Yes | Global | No |
| Ndb_conflict_last_conflict_epoch | Yes | Global | No | ||
| ndb-deferred-constraints | Yes | Yes | Yes | ||
| - Variable: ndb_deferred_constraints | Yes | Both | Yes | ||
| ndb_deferred_constraints | Yes | Yes | Yes | Both | Yes |
| ndb-distribution | Yes | Yes | Yes | ||
| - Variable: ndb_distribution | Yes | Global | Yes | ||
| ndb_distribution | Yes | Yes | Yes | Global | Yes |
| ndb_eventbuffer_free_percent | Yes | Yes | Yes | Global | Yes |
| ndb_eventbuffer_max_alloc | Yes | Yes | Yes | Global | Yes |
| ndb_extra_logging | Yes | Yes | Yes | Global | Yes |
| ndb_force_send | Yes | Yes | Yes | Both | Yes |
| ndb_index_stat_cache_entries | Yes | Yes | Yes | Both | Yes |
| ndb_index_stat_enable | Yes | Yes | Yes | Both | Yes |
| ndb_index_stat_option | Yes | Yes | Yes | Both | Yes |
| ndb_index_stat_update_freq | Yes | Yes | Yes | Both | Yes |
| ndb_join_pushdown | Yes | Both | Yes | ||
| ndb-log-apply-status | Yes | Yes | No | ||
| - Variable: ndb_log_apply_status | Yes | Global | No | ||
| ndb_log_apply_status | Yes | Yes | Yes | Global | No |
| ndb_log_bin | Yes | Yes | Both | Yes | |
| ndb_log_binlog_index | Yes | Yes | Global | Yes | |
| ndb-log-empty-epochs | Yes | Yes | Yes | Global | Yes |
| ndb_log_empty_epochs | Yes | Yes | Yes | Global | Yes |
| ndb-log-empty-update | Yes | Yes | Yes | Global | Yes |
| ndb_log_empty_update | Yes | Yes | Yes | Global | Yes |
| ndb-log-exclusive-reads | Yes | Yes | Yes | ||
| - Variable: ndb_log_exclusive_reads | Yes | Both | Yes | ||
| ndb_log_exclusive_reads | Yes | Yes | Yes | Both | Yes |
| ndb-log-orig | Yes | Yes | No | ||
| - Variable: ndb_log_orig | Yes | Global | No | ||
| ndb_log_orig | Yes | Yes | Yes | Global | No |
| ndb-log-transaction-id | Yes | Yes | No | ||
| - Variable: ndb_log_transaction_id | Yes | Global | No | ||
| ndb_log_transaction_id | Yes | Global | No | ||
| ndb-log-update-as-write | Yes | Yes | Yes | Global | Yes |
| ndb-log-update-minimal | Yes | Yes | Yes | Global | Yes |
| ndb_log_updated_only | Yes | Yes | Yes | Global | Yes |
| ndb_optimization_delay | Yes | Global | Yes | ||
| ndb_optimized_node_selection | Yes | Yes | Yes | Global | No |
| ndb_recv_thread_cpu_mask | Yes | Global | Yes | ||
| ndb_report_thresh_binlog_epoch_slip | Yes | Yes | Yes | Global | Yes |
| ndb_report_thresh_binlog_mem_usage | Yes | Yes | Yes | Global | Yes |
| ndb_show_foreign_key_mock_tables | Yes | Yes | Yes | Global | Yes |
| ndb_slave_conflict_role | Yes | Yes | Yes | Global | Yes |
| Ndb_slave_max_replicated_epoch | Yes | Global | No | ||
| ndb_table_no_logging | Yes | Session | Yes | ||
| ndb_table_temporary | Yes | Session | Yes | ||
| ndb_use_copying_alter_table | Yes | Both | No | ||
| ndb_use_exact_count | Yes | Both | Yes | ||
| ndb_use_transactions | Yes | Yes | Yes | Both | Yes |
| ndb_version | Yes | Global | No | ||
| ndb_version_string | Yes | Global | No | ||
| ndb-wait-connected | Yes | Yes | Yes | Global | No |
| ndb-wait-setup | Yes | Yes | Yes | Global | No |
| ndbinfo_database | Yes | Global | No | ||
| ndbinfo_max_bytes | Yes | Yes | Both | Yes | |
| ndbinfo_max_rows | Yes | Yes | Both | Yes | |
| ndbinfo_offline | Yes | Global | Yes | ||
| ndbinfo_show_hidden | Yes | Yes | Both | Yes | |
| ndbinfo_table_prefix | Yes | Yes | Both | Yes | |
| ndbinfo_version | Yes | Global | No | ||
| net_buffer_length | Yes | Yes | Yes | Both | Yes |
| net_read_timeout | Yes | Yes | Yes | Both | Yes |
| net_retry_count | Yes | Yes | Yes | Both | Yes |
| net_write_timeout | Yes | Yes | Yes | Both | Yes |
| new | Yes | Yes | Yes | Both | Yes |
| old | Yes | Yes | Yes | Global | No |
| old-alter-table | Yes | Yes | Yes | ||
| - Variable: old_alter_table | Yes | Both | Yes | ||
| old_passwords | Yes | Both | Yes | ||
| open-files-limit | Yes | Yes | No | ||
| - Variable: open_files_limit | Yes | Global | No | ||
| optimizer_join_cache_level | Yes | Yes | Yes | Both | Yes |
| optimizer_prune_level | Yes | Yes | Yes | Both | Yes |
| optimizer_search_depth | Yes | Yes | Yes | Both | Yes |
| optimizer_switch | Yes | Yes | Yes | Both | Yes |
| optimizer_trace | Yes | Both | Yes | ||
| optimizer_trace_features | Yes | Both | Yes | ||
| optimizer_trace_limit | Yes | Both | Yes | ||
| optimizer_trace_max_mem_size | Yes | Both | Yes | ||
| optimizer_trace_offset | Yes | Both | Yes | ||
| performance_schema | Yes | Yes | Yes | Global | No |
| performance_schema_accounts_size | Yes | Yes | Yes | Global | No |
| performance_schema_digests_size | Yes | Yes | Yes | Global | No |
| performance_schema_events_stages_history_long_size | Yes | Yes | Yes | Global | No |
| performance_schema_events_stages_history_size | Yes | Yes | Yes | Global | No |
| performance_schema_events_statements_history_long_size | Yes | Yes | Yes | Global | No |
| performance_schema_events_statements_history_size | Yes | Yes | Yes | Global | No |
| performance_schema_events_waits_history_long_size | Yes | Yes | Yes | Global | No |
| performance_schema_events_waits_history_size | Yes | Yes | Yes | Global | No |
| performance_schema_hosts_size | Yes | Yes | Yes | Global | No |
| performance_schema_max_cond_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_cond_instances | Yes | Yes | Yes | Global | No |
| performance_schema_max_digest_length | Yes | Yes | Yes | Global | No |
| performance_schema_max_file_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_file_handles | Yes | Yes | Yes | Global | No |
| performance_schema_max_file_instances | Yes | Yes | Yes | Global | No |
| performance_schema_max_mutex_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_mutex_instances | Yes | Yes | Yes | Global | No |
| performance_schema_max_rwlock_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_rwlock_instances | Yes | Yes | Yes | Global | No |
| performance_schema_max_socket_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_socket_instances | Yes | Yes | Yes | Global | No |
| performance_schema_max_stage_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_statement_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_table_handles | Yes | Yes | Yes | Global | No |
| performance_schema_max_table_instances | Yes | Yes | Yes | Global | No |
| performance_schema_max_thread_classes | Yes | Yes | Yes | Global | No |
| performance_schema_max_thread_instances | Yes | Yes | Yes | Global | No |
| performance_schema_session_connect_attrs_size | Yes | Yes | Yes | Global | No |
| performance_schema_setup_actors_size | Yes | Yes | Yes | Global | No |
| performance_schema_setup_objects_size | Yes | Yes | Yes | Global | No |
| performance_schema_users_size | Yes | Yes | Yes | Global | No |
| pid-file | Yes | Yes | No | ||
| - Variable: pid_file | Yes | Global | No | ||
| plugin_dir | Yes | Yes | Yes | Global | No |
| port | Yes | Yes | Yes | Global | No |
| preload_buffer_size | Yes | Yes | Yes | Both | Yes |
| profiling | Yes | Both | Yes | ||
| profiling_history_size | Yes | Yes | Yes | Both | Yes |
| protocol_version | Yes | Global | No | ||
| proxy_user | Yes | Session | No | ||
| pseudo_slave_mode | Yes | Session | Yes | ||
| pseudo_thread_id | Yes | Session | Yes | ||
| query_alloc_block_size | Yes | Yes | Yes | Both | Yes |
| query_cache_limit | Yes | Yes | Yes | Global | Yes |
| query_cache_min_res_unit | Yes | Yes | Yes | Global | Yes |
| query_cache_size | Yes | Yes | Yes | Global | Yes |
| query_cache_type | Yes | Yes | Yes | Both | Yes |
| query_cache_wlock_invalidate | Yes | Yes | Yes | Both | Yes |
| query_prealloc_size | Yes | Yes | Yes | Both | Yes |
| rand_seed1 | Yes | Session | Yes | ||
| rand_seed2 | Yes | Session | Yes | ||
| range_alloc_block_size | Yes | Yes | Yes | Both | Yes |
| read_buffer_size | Yes | Yes | Yes | Both | Yes |
| read_only | Yes | Yes | Yes | Global | Yes |
| read_rnd_buffer_size | Yes | Yes | Yes | Both | Yes |
| relay-log | Yes | Yes | No | ||
| - Variable: relay_log | Yes | Global | No | ||
| relay_log_basename | Yes | Global | No | ||
| relay-log-index | Yes | Yes | No | ||
| - Variable: relay_log_index | Yes | Global | No | ||
| relay_log_index | Yes | Yes | Yes | Global | No |
| relay_log_info_file | Yes | Yes | Yes | Global | No |
| relay_log_info_repository | Yes | Global | Yes | ||
| relay_log_purge | Yes | Yes | Yes | Global | Yes |
| relay_log_recovery | Yes | Yes | Yes | Global | Varies |
| relay_log_space_limit | Yes | Yes | Yes | Global | No |
| report-host | Yes | Yes | No | ||
| - Variable: report_host | Yes | Global | No | ||
| report-password | Yes | Yes | No | ||
| - Variable: report_password | Yes | Global | No | ||
| report-port | Yes | Yes | No | ||
| - Variable: report_port | Yes | Global | No | ||
| report-user | Yes | Yes | No | ||
| - Variable: report_user | Yes | Global | No | ||
| rpl_semi_sync_master_enabled | Yes | Global | Yes | ||
| rpl_semi_sync_master_timeout | Yes | Global | Yes | ||
| rpl_semi_sync_master_trace_level | Yes | Global | Yes | ||
| rpl_semi_sync_master_wait_no_slave | Yes | Global | Yes | ||
| rpl_semi_sync_slave_enabled | Yes | Global | Yes | ||
| rpl_semi_sync_slave_trace_level | Yes | Global | Yes | ||
| rpl_stop_slave_timeout | Yes | Yes | Yes | Global | Yes |
| secure-auth | Yes | Yes | Yes | ||
| - Variable: secure_auth | Yes | Global | Yes | ||
| secure-file-priv | Yes | Yes | No | ||
| - Variable: secure_file_priv | Yes | Global | No | ||
| server-id | Yes | Yes | Yes | ||
| - Variable: server_id | Yes | Global | Yes | ||
| server-id-bits | Yes | Yes | No | ||
| - Variable: server_id_bits | Yes | Global | No | ||
| server_id_bits | Yes | Yes | Yes | Global | No |
| server_uuid | Yes | Global | No | ||
| sha256_password_private_key_path | Yes | Yes | Yes | Global | No |
| sha256_password_public_key_path | Yes | Yes | Yes | Global | No |
| shared_memory | Yes | Yes | Yes | Global | No |
| shared_memory_base_name | Yes | Yes | Yes | Global | No |
| show_old_temporals | Yes | Yes | Yes | Both | Yes |
| simplified_binlog_gtid_recovery | Yes | Yes | Yes | Global | No |
| skip_external_locking | Yes | Yes | Yes | Global | No |
| skip-name-resolve | Yes | Yes | No | ||
| - Variable: skip_name_resolve | Yes | Global | No | ||
| skip-networking | Yes | Yes | No | ||
| - Variable: skip_networking | Yes | Global | No | ||
| skip-show-database | Yes | Yes | No | ||
| - Variable: skip_show_database | Yes | Global | No | ||
| slave_allow_batching | Yes | Yes | Yes | Global | Yes |
| slave_checkpoint_group | Yes | Yes | Yes | Global | Yes |
| slave_checkpoint_period | Yes | Yes | Yes | Global | Yes |
| slave_compressed_protocol | Yes | Yes | Yes | Global | Yes |
| slave_exec_mode | Yes | Yes | Yes | Global | Yes |
| slave-load-tmpdir | Yes | Yes | No | ||
| - Variable: slave_load_tmpdir | Yes | Global | No | ||
| slave_max_allowed_packet | Yes | Global | Yes | ||
| slave-net-timeout | Yes | Yes | Yes | ||
| - Variable: slave_net_timeout | Yes | Global | Yes | ||
| slave_parallel_workers | Yes | Yes | Global | Yes | |
| slave_pending_jobs_size_max | Yes | Global | Yes | ||
| slave_rows_search_algorithms | Yes | Global | Yes | ||
| slave-skip-errors | Yes | Yes | No | ||
| - Variable: slave_skip_errors | Yes | Global | No | ||
| slave_sql_verify_checksum | Yes | Global | Yes | ||
| slave_transaction_retries | Yes | Yes | Yes | Global | Yes |
| slave_type_conversions | Yes | Yes | Yes | Global | No |
| slow_launch_time | Yes | Yes | Yes | Global | Yes |
| slow-query-log | Yes | Yes | Yes | ||
| - Variable: slow_query_log | Yes | Global | Yes | ||
| slow_query_log_file | Yes | Yes | Yes | Global | Yes |
| socket | Yes | Yes | Yes | Global | No |
| sort_buffer_size | Yes | Yes | Yes | Both | Yes |
| sql_auto_is_null | Yes | Both | Yes | ||
| sql_big_selects | Yes | Both | Yes | ||
| sql_big_tables | Yes | Both | Yes | ||
| sql_buffer_result | Yes | Both | Yes | ||
| sql_log_bin | Yes | Session | Yes | ||
| sql_log_off | Yes | Both | Yes | ||
| sql_low_priority_updates | Yes | Both | Yes | ||
| sql_max_join_size | Yes | Both | Yes | ||
| sql-mode | Yes | Yes | Yes | ||
| - Variable: sql_mode | Yes | Both | Yes | ||
| sql_notes | Yes | Both | Yes | ||
| sql_quote_show_create | Yes | Both | Yes | ||
| sql_safe_updates | Yes | Both | Yes | ||
| sql_select_limit | Yes | Both | Yes | ||
| sql_slave_skip_counter | Yes | Global | Yes | ||
| sql_warnings | Yes | Both | Yes | ||
| ssl-ca | Yes | Yes | No | ||
| - Variable: ssl_ca | Yes | Global | No | ||
| ssl-capath | Yes | Yes | No | ||
| - Variable: ssl_capath | Yes | Global | No | ||
| ssl-cert | Yes | Yes | No | ||
| - Variable: ssl_cert | Yes | Global | No | ||
| ssl-cipher | Yes | Yes | No | ||
| - Variable: ssl_cipher | Yes | Global | No | ||
| ssl-crl | Yes | Yes | No | ||
| - Variable: ssl_crl | Yes | Global | No | ||
| ssl-crlpath | Yes | Yes | No | ||
| - Variable: ssl_crlpath | Yes | Global | No | ||
| ssl-key | Yes | Yes | No | ||
| - Variable: ssl_key | Yes | Global | No | ||
| storage_engine | Yes | Both | Yes | ||
| stored_program_cache | Yes | Yes | Yes | Global | Yes |
| sync_binlog | Yes | Yes | Yes | Global | Yes |
| sync_frm | Yes | Yes | Yes | Global | Yes |
| sync_master_info | Yes | Yes | Yes | Global | Yes |
| sync_relay_log | Yes | Yes | Yes | Global | Yes |
| sync_relay_log_info | Yes | Yes | Yes | Global | Yes |
| system_time_zone | Yes | Global | No | ||
| table_definition_cache | Yes | Global | Yes | ||
| table_open_cache | Yes | Global | Yes | ||
| table_open_cache_instances | Yes | Global | No | ||
| thread_cache_size | Yes | Yes | Yes | Global | Yes |
| thread_concurrency | Yes | Yes | Yes | Global | No |
| thread_handling | Yes | Yes | Yes | Global | No |
| thread_pool_algorithm | Yes | Yes | Yes | Global | No |
| thread_pool_high_priority_connection | Yes | Yes | Yes | Both | Yes |
| thread_pool_max_unused_threads | Yes | Yes | Yes | Global | Yes |
| thread_pool_prio_kickup_timer | Yes | Yes | Yes | Both | Yes |
| thread_pool_size | Yes | Yes | Yes | Global | No |
| thread_pool_stall_limit | Yes | Yes | Yes | Global | Yes |
| thread_stack | Yes | Yes | Yes | Global | No |
| time_format | Yes | Global | No | ||
| time_zone | Yes | Both | Yes | ||
| timed_mutexes | Yes | Yes | Yes | Global | Yes |
| timestamp | Yes | Session | Yes | ||
| tmp_table_size | Yes | Yes | Yes | Both | Yes |
| tmpdir | Yes | Yes | Yes | Global | No |
| transaction_alloc_block_size | Yes | Yes | Yes | Both | Yes |
| transaction_allow_batching | Yes | Session | Yes | ||
| transaction_prealloc_size | Yes | Yes | Yes | Both | Yes |
| tx_isolation | Yes | Both | Yes | ||
| tx_read_only | Yes | Both | Yes | ||
| unique_checks | Yes | Both | Yes | ||
| updatable_views_with_limit | Yes | Yes | Yes | Both | Yes |
| validate_password_dictionary_file | Yes | Global | Varies | ||
| validate_password_length | Yes | Global | Yes | ||
| validate_password_mixed_case_count | Yes | Global | Yes | ||
| validate_password_number_count | Yes | Global | Yes | ||
| validate_password_policy | Yes | Global | Yes | ||
| validate_password_special_char_count | Yes | Global | Yes | ||
| validate_user_plugins | Yes | Global | No | ||
| version | Yes | Global | No | ||
| version_comment | Yes | Global | No | ||
| version_compile_machine | Yes | Global | No | ||
| version_compile_os | Yes | Global | No | ||
| wait_timeout | Yes | Yes | Yes | Both | Yes |
| warning_count | Yes | Session | No |
状态变量列表
Table 5.4 Status Variable Summary