7.1.4 Server Option, System Variable, and Status Variable Reference

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MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4

7.1.4 Server Option, System Variable, and Status Variable Reference

The following table lists all command-line options, system variables, and status variables applicable within mysqld.

The table lists command-line options (Cmd-line), options valid in configuration files (Option file), server system variables (System Var), and status variables (Status var) in one unified list, with an indication of where each option or variable is valid. If a server option set on the command line or in an option file differs from the name of the corresponding system variable, the variable name is noted immediately below the corresponding option. For system and status variables, the scope of the variable (Var Scope) is Global, Session, or both. Please see the corresponding item descriptions for details on setting and using the options and variables. Where appropriate, direct links to further information about the items are provided.

For a version of this table that is specific to NDB Cluster, see Section 25.4.2.5, “NDB Cluster mysqld Option and Variable Reference”.

Table 7.1 Command-Line Option, System Variable, and Status Variable Summary

Name Cmd-Line Option File System Var Status Var Var Scope Dynamic
Aborted_clients Yes Global No
Aborted_connects Yes Global No
Acl_cache_items_count Yes Global No
activate_all_roles_on_login Yes Yes Yes Global Yes
admin_address Yes Yes Yes Global No
admin_port Yes Yes Yes Global No
admin_ssl_ca Yes Yes Yes Global Yes
admin_ssl_capath Yes Yes Yes Global Yes
admin_ssl_cert Yes Yes Yes Global Yes
admin_ssl_cipher Yes Yes Yes Global Yes
admin_ssl_crl Yes Yes Yes Global Yes
admin_ssl_crlpath Yes Yes Yes Global Yes
admin_ssl_key Yes Yes Yes Global Yes
admin_tls_ciphersuites Yes Yes Yes Global Yes
admin_tls_version Yes Yes Yes Global Yes
allow-suspicious-udfs Yes Yes
ansi Yes Yes
audit-log Yes Yes
audit_log_buffer_size Yes Yes Yes Global No
audit_log_compression Yes Yes Yes Global No
audit_log_connection_policy Yes Yes Yes Global Yes
audit_log_current_session Yes Both No
Audit_log_current_size Yes Global No
audit_log_database Yes Yes Yes Global No
Audit_log_direct_writes Yes Global No
audit_log_disable Yes Yes Yes Global Yes
audit_log_encryption Yes Yes Yes Global No
Audit_log_event_max_drop_size Yes Global No
Audit_log_events Yes Global No
Audit_log_events_filtered Yes Global No
Audit_log_events_lost Yes Global No
Audit_log_events_written Yes Global No
audit_log_exclude_accounts Yes Yes Yes Global Yes
audit_log_file Yes Yes Yes Global No
audit_log_filter_id Yes Both No
audit_log_flush Yes Global Yes
audit_log_flush_interval_seconds Yes Yes Global No
audit_log_format Yes Yes Yes Global No
audit_log_format_unix_timestamp Yes Yes Yes Global Yes
audit_log_include_accounts Yes Yes Yes Global Yes
audit_log_password_history_keep_days Yes Yes Yes Global Yes
audit_log_policy Yes Yes Yes Global No
audit_log_prune_seconds Yes Yes Yes Global Yes
audit_log_read_buffer_size Yes Yes Yes Both Yes
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
Audit_log_total_size Yes Global No
Audit_log_write_waits Yes Global No
authentication_kerberos_service_key_tab Yes Yes Yes Global No
authentication_kerberos_service_principal Yes Yes Yes Global Yes
authentication_ldap_sasl_auth_method_name Yes Yes Yes Global Yes
authentication_ldap_sasl_bind_base_dn Yes Yes Yes Global Yes
authentication_ldap_sasl_bind_root_dn Yes Yes Yes Global Yes
authentication_ldap_sasl_bind_root_pwd Yes Yes Yes Global Yes
authentication_ldap_sasl_ca_path Yes Yes Yes Global Yes
authentication_ldap_sasl_connect_timeout Yes Yes Yes Global Yes
authentication_ldap_sasl_group_search_attr Yes Yes Yes Global Yes
authentication_ldap_sasl_group_search_filter Yes Yes Yes Global Yes
authentication_ldap_sasl_init_pool_size Yes Yes Yes Global Yes
authentication_ldap_sasl_log_status Yes Yes Yes Global Yes
authentication_ldap_sasl_max_pool_size Yes Yes Yes Global Yes
authentication_ldap_sasl_referral Yes Yes Yes Global Yes
authentication_ldap_sasl_response_timeout Yes Yes Yes Global Yes
authentication_ldap_sasl_server_host Yes Yes Yes Global Yes
authentication_ldap_sasl_server_port Yes Yes Yes Global Yes
Authentication_ldap_sasl_supported_methods Yes Global No
authentication_ldap_sasl_tls Yes Yes Yes Global Yes
authentication_ldap_sasl_user_search_attr Yes Yes Yes Global Yes
authentication_ldap_simple_auth_method_name Yes Yes Yes Global Yes
authentication_ldap_simple_bind_base_dn Yes Yes Yes Global Yes
authentication_ldap_simple_bind_root_dn Yes Yes Yes Global Yes
authentication_ldap_simple_bind_root_pwd Yes Yes Yes Global Yes
authentication_ldap_simple_ca_path Yes Yes Yes Global Yes
authentication_ldap_simple_connect_timeout Yes Yes Yes Global Yes
authentication_ldap_simple_group_search_attr Yes Yes Yes Global Yes
authentication_ldap_simple_group_search_filter Yes Yes Yes Global Yes
authentication_ldap_simple_init_pool_size Yes Yes Yes Global Yes
authentication_ldap_simple_log_status Yes Yes Yes Global Yes
authentication_ldap_simple_max_pool_size Yes Yes Yes Global Yes
authentication_ldap_simple_referral Yes Yes Yes Global Yes
authentication_ldap_simple_response_timeout Yes Yes Yes Global Yes
authentication_ldap_simple_server_host Yes Yes Yes Global Yes
authentication_ldap_simple_server_port Yes Yes Yes Global Yes
authentication_ldap_simple_tls Yes Yes Yes Global Yes
authentication_ldap_simple_user_search_attr Yes Yes Yes Global Yes
authentication_policy Yes Yes Yes Global Yes
authentication_webauthn_rp_id Yes Yes Yes Global Yes
authentication_windows_log_level Yes Yes Yes Global No
authentication_windows_use_principal_name Yes Yes Yes Global No
auto_generate_certs Yes Yes Yes Global No
auto_increment_increment Yes Yes Yes Both Yes
auto_increment_offset Yes Yes Yes Both Yes
autocommit Yes Yes Yes Both Yes
automatic_sp_privileges Yes Yes Yes Global Yes
back_log Yes Yes Yes Global No
basedir Yes Yes Yes Global No
big_tables Yes Yes Yes Both Yes
bind_address Yes Yes Yes Global No
Binlog_cache_disk_use Yes Global No
binlog_cache_size Yes Yes Yes Global Yes
Binlog_cache_use Yes Global No
binlog-checksum Yes Yes
binlog_checksum Yes Yes Yes Global Yes
binlog_direct_non_transactional_updates Yes Yes Yes Both Yes
binlog-do-db Yes Yes
binlog_encryption Yes Yes Yes Global Yes
binlog_error_action Yes Yes Yes Global Yes
binlog_expire_logs_auto_purge Yes Yes Yes Global Yes
binlog_expire_logs_seconds Yes Yes Yes Global Yes
binlog_format Yes Yes Yes Both Yes
binlog_group_commit_sync_delay Yes Yes Yes Global Yes
binlog_group_commit_sync_no_delay_count Yes Yes Yes Global Yes
binlog_gtid_simple_recovery Yes Yes Yes Global No
binlog-ignore-db Yes Yes
binlog_max_flush_queue_time Yes Yes Yes Global Yes
binlog_order_commits Yes Yes Yes Global Yes
binlog_rotate_encryption_master_key_at_startup Yes Yes Yes Global No
binlog_row_event_max_size Yes Yes Yes Global No
binlog_row_image Yes Yes Yes Both Yes
binlog_row_metadata Yes Yes Yes Global Yes
binlog_row_value_options Yes Yes Yes Both Yes
binlog_rows_query_log_events Yes Yes Yes Both Yes
Binlog_stmt_cache_disk_use Yes Global No
binlog_stmt_cache_size Yes Yes Yes Global Yes
Binlog_stmt_cache_use Yes Global No
binlog_transaction_compression Yes Yes Yes Both Yes
binlog_transaction_compression_level_zstd Yes Yes Yes Both Yes
binlog_transaction_dependency_history_size Yes Yes Yes Global Yes
block_encryption_mode Yes Yes Yes Both Yes
build_id Yes Global No
bulk_insert_buffer_size Yes Yes Yes Both Yes
Bytes_received Yes Both No
Bytes_sent Yes Both No
caching_sha2_password_auto_generate_rsa_keys Yes Yes Yes Global No
caching_sha2_password_digest_rounds Yes Yes Yes Global Yes
caching_sha2_password_private_key_path Yes Yes Yes Global No
caching_sha2_password_public_key_path Yes Yes Yes Global No
Caching_sha2_password_rsa_public_key Yes Global No
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 Both Yes
character_set_results Yes Both Yes
character_set_server Yes Yes Yes Both Yes
character_set_system Yes Global No
character_sets_dir Yes Yes Yes Global No
check_proxy_users Yes Yes Yes Global Yes
check-table-functions Yes Yes
chroot Yes Yes
clone_autotune_concurrency Yes Yes Yes Global Yes
clone_block_ddl Yes Yes Yes Global Yes
clone_buffer_size Yes Yes Yes Global Yes
clone_ddl_timeout Yes Yes Yes Global Yes
clone_delay_after_data_drop Yes Yes Yes Global Yes
clone_donor_timeout_after_network_failure Yes Yes Yes Global Yes
clone_enable_compression Yes Yes Yes Global Yes
clone_max_concurrency Yes Yes Yes Global Yes
clone_max_data_bandwidth Yes Yes Yes Global Yes
clone_max_network_bandwidth Yes Yes Yes Global Yes
clone_ssl_ca Yes Yes Yes Global Yes
clone_ssl_cert Yes Yes Yes Global Yes
clone_ssl_key Yes Yes Yes Global Yes
clone_valid_donor_list Yes Yes Yes Global Yes
collation_connection Yes Both Yes
collation_database (note 1) Yes Both Yes
collation_server Yes Yes Yes Both Yes
Com_admin_commands Yes Both No
Com_alter_db Yes Both No
Com_alter_event Yes Both No
Com_alter_function Yes Both No
Com_alter_procedure Yes Both No
Com_alter_resource_group Yes Global No
Com_alter_server Yes Both No
Com_alter_table Yes Both No
Com_alter_tablespace Yes Both No
Com_alter_user Yes Both No
Com_alter_user_default_role Yes Global No
Com_analyze Yes Both No
Com_assign_to_keycache Yes Both No
Com_begin Yes Both No
Com_binlog Yes Both No
Com_call_procedure Yes Both No
Com_change_db Yes Both No
Com_change_repl_filter Yes Both No
Com_change_replication_source Yes Both No
Com_check Yes Both No
Com_checksum Yes Both No
Com_clone Yes Global No
Com_commit Yes Both No
Com_create_db Yes Both No
Com_create_event Yes Both No
Com_create_function Yes Both No
Com_create_index Yes Both No
Com_create_procedure Yes Both No
Com_create_resource_group Yes Global No
Com_create_role Yes Global No
Com_create_server Yes Both No
Com_create_table Yes Both No
Com_create_trigger Yes Both No
Com_create_udf Yes Both No
Com_create_user Yes Both No
Com_create_view Yes Both No
Com_dealloc_sql Yes Both No
Com_delete Yes Both No
Com_delete_multi Yes Both No
Com_do Yes Both No
Com_drop_db Yes Both No
Com_drop_event Yes Both No
Com_drop_function Yes Both No
Com_drop_index Yes Both No
Com_drop_procedure Yes Both No
Com_drop_resource_group Yes Global No
Com_drop_role Yes Global No
Com_drop_server Yes Both No
Com_drop_table Yes Both No
Com_drop_trigger Yes Both No
Com_drop_user Yes Both No
Com_drop_view Yes Both No
Com_empty_query Yes Both No
Com_execute_sql Yes Both No
Com_explain_other Yes Both No
Com_flush Yes Both No
Com_get_diagnostics Yes Both No
Com_grant Yes Both No
Com_grant_roles Yes Global No
Com_group_replication_start Yes Global No
Com_group_replication_stop Yes Global No
Com_ha_close Yes Both No
Com_ha_open Yes Both No
Com_ha_read Yes Both No
Com_help Yes Both No
Com_insert Yes Both No
Com_insert_select Yes Both No
Com_install_component Yes Global No
Com_install_plugin Yes Both No
Com_kill Yes Both No
Com_load Yes Both No
Com_lock_tables Yes Both No
Com_optimize Yes Both No
Com_preload_keys Yes Both No
Com_prepare_sql Yes Both No
Com_purge Yes Both No
Com_purge_before_date Yes Both No
Com_release_savepoint Yes Both No
Com_rename_table Yes Both No
Com_rename_user Yes Both No
Com_repair Yes Both No
Com_replace Yes Both No
[Com_replace_select](h

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