mysql系统变量

http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html

 

Table 5.2 System Variable Summary

NameCmd-LineOption FileSystem VarVar ScopeDynamic
audit_log_buffer_sizeYesYesYesGlobalNo
audit_log_fileYesYesYesGlobalNo
audit_log_flush  YesGlobalYes
audit_log_formatYesYesYesGlobalNo
audit_log_policyYesYesYesGlobalYes
audit_log_rotate_on_sizeYesYesYesGlobalYes
audit_log_strategyYesYesYesGlobalNo
auto_increment_increment  YesBothYes
auto_increment_offset  YesBothYes
autocommitYesYesYesVariesYes
automatic_sp_privileges  YesGlobalYes
back_log  YesGlobalNo
basedirYesYesYesGlobalNo
big-tablesYesYes  Yes
Variablebig_tables  YesVariesYes
binlog_cache_sizeYesYesYesGlobalYes
binlog_direct_non_transactional_updatesYesYesYesBothYes
binlog-formatYesYes  Yes
Variablebinlog_format  YesBothYes
binlog_stmt_cache_sizeYesYesYesGlobalYes
bulk_insert_buffer_sizeYesYesYesBothYes
character_set_client  YesBothYes
character_set_connection  YesBothYes
character_set_database[a]  YesBothYes
character-set-filesystemYesYes  Yes
Variablecharacter_set_filesystem  YesBothYes
character_set_results  YesBothYes
character-set-serverYesYes  Yes
Variablecharacter_set_server  YesBothYes
character_set_system  YesGlobalNo
character-sets-dirYesYes  No
Variablecharacter_sets_dir  YesGlobalNo
collation_connection  YesBothYes
collation_database[b]  YesBothYes
collation-serverYesYes  Yes
Variablecollation_server  YesBothYes
completion_typeYesYesYesBothYes
concurrent_insertYesYesYesGlobalYes
connect_timeoutYesYesYesGlobalYes
datadirYesYesYesGlobalNo
date_format  YesVariesNo
datetime_format  YesVariesNo
debugYesYesYesBothYes
debug_sync  YesVariesYes
default-storage-engineYesYes  Yes
Variabledefault_storage_engine  YesBothYes
default_week_formatYesYesYesBothYes
delay-key-writeYesYes  Yes
Variabledelay_key_write  YesGlobalYes
delayed_insert_limitYesYesYesGlobalYes
delayed_insert_timeoutYesYesYesGlobalYes
delayed_queue_sizeYesYesYesGlobalYes
div_precision_incrementYesYesYesBothYes
engine-condition-pushdownYesYes  Yes
Variableengine_condition_pushdown  YesBothYes
error_count  YesSessionNo
event-schedulerYesYes  Yes
Variableevent_scheduler  YesGlobalYes
expire_logs_daysYesYesYesGlobalYes
external_user  YesSessionNo
flushYesYesYesGlobalYes
flush_timeYesYesYesGlobalYes
foreign_key_checks  YesVariesYes
ft_boolean_syntaxYesYesYesGlobalYes
ft_max_word_lenYesYesYesGlobalNo
ft_min_word_lenYesYesYesGlobalNo
ft_query_expansion_limitYesYesYesGlobalNo
ft_stopword_fileYesYesYesGlobalNo
general-logYesYes  Yes
Variablegeneral_log  YesGlobalYes
general_log_fileYesYesYesGlobalYes
group_concat_max_lenYesYesYesBothYes
have_compress  YesGlobalNo
have_crypt  YesGlobalNo
have_csv  YesGlobalNo
have_dynamic_loading  YesGlobalNo
have_geometry  YesGlobalNo
have_innodb  YesGlobalNo
have_ndbcluster  YesGlobalNo
have_openssl  YesGlobalNo
have_partitioning  YesGlobalNo
have_profiling  YesGlobalNo
have_query_cache  YesGlobalNo
have_rtree_keys  YesGlobalNo
have_ssl  YesGlobalNo
have_symlink  YesGlobalNo
hostname  YesGlobalNo
identity  YesSessionYes
ignore-builtin-innodbYesYes  No
Variableignore_builtin_innodb  YesGlobalNo
init_connectYesYesYesGlobalYes
init-fileYesYes  No
Variableinit_file  YesGlobalNo
init_slaveYesYesYesGlobalYes
innodb_adaptive_flushingYesYesYesGlobalYes
innodb_adaptive_hash_indexYesYesYesGlobalYes
innodb_additional_mem_pool_sizeYesYesYesGlobalNo
innodb_autoextend_incrementYesYesYesGlobalYes
innodb_autoinc_lock_modeYesYesYesGlobalNo
innodb_buffer_pool_instancesYesYesYesGlobalNo
innodb_buffer_pool_sizeYesYesYesGlobalNo
innodb_change_bufferingYesYesYesGlobalYes
innodb_checksumsYesYesYesGlobalNo
innodb_commit_concurrencyYesYesYesGlobalYes
innodb_concurrency_ticketsYesYesYesGlobalYes
innodb_data_file_pathYesYesYesGlobalNo
innodb_data_home_dirYesYesYesGlobalNo
innodb_doublewriteYesYesYesGlobalNo
innodb_fast_shutdownYesYesYesGlobalYes
innodb_file_formatYesYesYesGlobalYes
innodb_file_format_checkYesYesYesGlobalVaries
innodb_file_format_maxYesYesYesGlobalYes
innodb_file_per_tableYesYesYesGlobalYes
innodb_flush_log_at_trx_commitYesYesYesGlobalYes
innodb_flush_methodYesYesYesGlobalNo
innodb_force_load_corruptedYesYesYesGlobalNo
innodb_force_recoveryYesYesYesGlobalNo
innodb_io_capacityYesYesYesGlobalYes
innodb_large_prefixYesYesYesGlobalYes
innodb_lock_wait_timeoutYesYesYesBothYes
innodb_locks_unsafe_for_binlogYesYesYesGlobalNo
innodb_log_buffer_sizeYesYesYesGlobalNo
innodb_log_file_sizeYesYesYesGlobalNo
innodb_log_files_in_groupYesYesYesGlobalNo
innodb_log_group_home_dirYesYesYesGlobalNo
innodb_max_dirty_pages_pctYesYesYesGlobalYes
innodb_max_purge_lagYesYesYesGlobalYes
innodb_mirrored_log_groupsYesYesYesGlobalNo
innodb_old_blocks_pctYesYesYesGlobalYes
innodb_old_blocks_timeYesYesYesGlobalYes
innodb_open_filesYesYesYesGlobalNo
innodb_print_all_deadlocksYesYesYesGlobalYes
innodb_purge_batch_sizeYesYesYesGlobalYes
innodb_purge_threadsYesYesYesGlobalNo
innodb_random_read_aheadYesYesYesGlobalYes
innodb_read_ahead_thresholdYesYesYesGlobalYes
innodb_read_io_threadsYesYesYesGlobalNo
innodb_replication_delayYesYesYesGlobalYes
innodb_rollback_on_timeoutYesYesYesGlobalNo
innodb_rollback_segmentsYesYesYesGlobalYes
innodb_spin_wait_delayYesYesYesGlobalYes
innodb_stats_methodYesYesYesGlobalYes
innodb_stats_on_metadataYesYesYesGlobalYes
innodb_stats_sample_pagesYesYesYesGlobalYes
innodb_strict_modeYesYesYesBothYes
innodb_support_xaYesYesYesBothYes
innodb_sync_spin_loopsYesYesYesGlobalYes
innodb_table_locksYesYesYesBothYes
innodb_thread_concurrencyYesYesYesGlobalYes
innodb_thread_sleep_delayYesYesYesGlobalYes
innodb_use_native_aioYesYesYesGlobalNo
innodb_use_sys_mallocYesYesYesGlobalNo
innodb_version  YesGlobalNo
innodb_write_io_threadsYesYesYesGlobalNo
insert_id  YesSessionYes
interactive_timeoutYesYesYesBothYes
join_buffer_sizeYesYesYesBothYes
keep_files_on_createYesYesYesBothYes
key_buffer_sizeYesYesYesGlobalYes
key_cache_age_thresholdYesYesYesGlobalYes
key_cache_block_sizeYesYesYesGlobalYes
key_cache_division_limitYesYesYesGlobalYes
languageYesYesYesGlobalNo
large_files_support  YesGlobalNo
large_page_size  YesGlobalNo
large-pagesYesYes  No
Variablelarge_pages  YesGlobalNo
last_insert_id  YesSessionYes
lc-messagesYesYes  Yes
Variablelc_messages  YesBothYes
lc-messages-dirYesYes  No
Variablelc_messages_dir  YesGlobalNo
lc_time_names  YesBothYes
license  YesGlobalNo
local_infile  YesGlobalYes
lock_wait_timeoutYesYesYesBothYes
locked_in_memory  YesGlobalNo
logYesYesYesGlobalYes
log_bin  YesGlobalNo
log-binYesYesYesGlobalNo
log-bin-trust-function-creatorsYesYes  Yes
Variablelog_bin_trust_function_creators  YesGlobalYes
log-bin-trust-routine-creatorsYesYes  Yes
Variablelog_bin_trust_routine_creators  YesGlobalYes
log_bin_use_v1_row_eventsYesYesYesGlobalNo
log-bin-use-v1-row-eventsYesYes  No
Variablelog_bin_use_v1_row_events  YesGlobalNo
log-errorYesYes  No
Variablelog_error  YesGlobalNo
log-outputYesYes  Yes
Variablelog_output  YesGlobalYes
log-queries-not-using-indexesYesYes  Yes
Variablelog_queries_not_using_indexes  YesGlobalYes
log-slave-updatesYesYes  No
Variablelog_slave_updates  YesGlobalNo
log_slave_updatesYesYesYesGlobalNo
log-slow-queriesYesYes  Yes
Variablelog_slow_queries  YesGlobalYes
log-warningsYesYes  Yes
Variablelog_warnings  YesBothYes
long_query_timeYesYesYesBothYes
low-priority-updatesYesYes  Yes
Variablelow_priority_updates  YesBothYes
lower_case_file_system  YesGlobalNo
lower_case_table_namesYesYesYesGlobalNo
max_allowed_packetYesYesYesGlobalYes
max_binlog_cache_sizeYesYesYesGlobalYes
max_binlog_sizeYesYesYesGlobalYes
max_binlog_stmt_cache_sizeYesYesYesGlobalYes
max_connect_errorsYesYesYesGlobalYes
max_connectionsYesYesYesGlobalYes
max_delayed_threadsYesYesYesBothYes
max_error_countYesYesYesBothYes
max_heap_table_sizeYesYesYesBothYes
max_insert_delayed_threads  YesBothYes
max_join_sizeYesYesYesBothYes
max_length_for_sort_dataYesYesYesBothYes
max_long_data_sizeYesYesYesGlobalNo
max_prepared_stmt_countYesYesYesGlobalYes
max_relay_log_sizeYesYesYesGlobalYes
max_seeks_for_keyYesYesYesBothYes
max_sort_lengthYesYesYesBothYes
max_sp_recursion_depthYesYesYesBothYes
max_user_connectionsYesYesYesBothYes
max_write_lock_countYesYesYesGlobalYes
metadata_locks_cache_size  YesGlobalNo
min-examined-row-limitYesYesYesBothYes
myisam_data_pointer_sizeYesYesYesGlobalYes
myisam_max_sort_file_sizeYesYesYesGlobalYes
myisam_mmap_sizeYesYesYesGlobalNo
myisam_recover_options  YesGlobalNo
myisam_repair_threadsYesYesYesBothYes
myisam_sort_buffer_sizeYesYesYesBothYes
myisam_stats_methodYesYesYesBothYes
myisam_use_mmapYesYesYesGlobalYes
named_pipe  YesGlobalNo
ndb_autoincrement_prefetch_szYesYesYesBothYes
ndb-batch-sizeYesYesYesGlobalNo
ndb-blob-read-batch-bytesYesYesYesBothYes
ndb-blob-write-batch-bytesYesYesYesBothYes
ndb_cache_check_timeYesYesYesGlobalYes
ndb-cluster-connection-poolYesYesYesGlobalNo
ndb-deferred-constraintsYesYes  Yes
Variablendb_deferred_constraints  YesBothYes
ndb_deferred_constraintsYesYesYesBothYes
ndb_distributionYesYesYesGlobalYes
ndb-distributionYesYes  Yes
Variablendb_distribution  YesGlobalYes
ndb_eventbuffer_max_allocYesYesYesGlobalYes
ndb_extra_loggingYesYesYesGlobalYes
ndb_force_sendYesYesYesBothYes
ndb_index_stat_cache_entriesYesYesYesBothYes
ndb_index_stat_enableYesYesYesBothYes
ndb_index_stat_optionYesYesYesBothYes
ndb_index_stat_update_freqYesYesYesBothYes
ndb_join_pushdown  YesBothYes
ndb-log-apply-statusYesYes  No
Variablendb_log_apply_status  YesGlobalNo
ndb_log_apply_statusYesYesYesGlobalNo
ndb_log_binYes YesBothYes
ndb_log_binlog_indexYes YesGlobalYes
ndb_log_empty_epochsYesYesYesGlobalYes
ndb-log-empty-epochsYesYesYesGlobalYes
ndb-log-origYesYes  No
Variablendb_log_orig  YesGlobalNo
ndb_log_origYesYesYesGlobalNo
ndb-log-transaction-idYesYes  No
Variablendb_log_transaction_id  YesGlobalNo
ndb_log_transaction_id  YesGlobalNo
ndb-log-update-as-writeYesYesYesGlobalYes
ndb_log_updated_onlyYesYesYesGlobalYes
ndb_optimization_delay  YesGlobalYes
ndb_optimized_node_selectionYesYesYesGlobalNo
ndb_table_no_logging  YesSessionYes
ndb_table_temporary  YesSessionYes
ndb_use_copying_alter_table  YesBothNo
ndb_use_exact_count  YesBothYes
ndb_use_transactionsYesYesYesBothYes
ndb_version  YesGlobalNo
ndb_version_string  YesGlobalNo
ndb-wait-connectedYesYesYesGlobalNo
ndb-wait-setupYesYesYesGlobalNo
ndbinfo_database  YesGlobalNo
ndbinfo_max_bytesYes YesBothYes
ndbinfo_max_rowsYes YesBothYes
ndbinfo_offline  YesGlobalYes
ndbinfo_show_hiddenYes YesBothYes
ndbinfo_table_prefixYes YesBothYes
ndbinfo_version  YesGlobalNo
net_buffer_lengthYesYesYesBothYes
net_read_timeoutYesYesYesBothYes
net_retry_countYesYesYesBothYes
net_write_timeoutYesYesYesBothYes
newYesYesYesBothYes
oldYesYesYesGlobalNo
old-alter-tableYesYes  Yes
Variableold_alter_table  YesBothYes
old_passwords  YesBothYes
open-files-limitYesYes  No
Variableopen_files_limit  YesGlobalNo
optimizer_prune_levelYesYesYesBothYes
optimizer_search_depthYesYesYesBothYes
optimizer_switchYesYesYesBothYes
performance_schemaYesYesYesGlobalNo
performance_schema_events_waits_history_long_sizeYesYesYesGlobalNo
performance_schema_events_waits_history_sizeYesYesYesGlobalNo
performance_schema_max_cond_classesYesYesYesGlobalNo
performance_schema_max_cond_instancesYesYesYesGlobalNo
performance_schema_max_file_classesYesYesYesGlobalNo
performance_schema_max_file_handlesYesYesYesGlobalNo
performance_schema_max_file_instancesYesYesYesGlobalNo
performance_schema_max_mutex_classesYesYesYesGlobalNo
performance_schema_max_mutex_instancesYesYesYesGlobalNo
performance_schema_max_rwlock_classesYesYesYesGlobalNo
performance_schema_max_rwlock_instancesYesYesYesGlobalNo
performance_schema_max_table_handlesYesYesYesGlobalNo
performance_schema_max_table_instancesYesYesYesGlobalNo
performance_schema_max_thread_classesYesYesYesGlobalNo
performance_schema_max_thread_instancesYesYesYesGlobalNo
pid-fileYesYes  No
Variablepid_file  YesGlobalNo
plugin_dirYesYesYesGlobalNo
portYesYesYesGlobalNo
preload_buffer_sizeYesYesYesBothYes
profiling  YesVariesYes
profiling_history_sizeYesYesYesBothYes
protocol_version  YesGlobalNo
proxy_user  YesSessionNo
pseudo_slave_mode  YesSessionYes
pseudo_thread_id  YesSessionYes
query_alloc_block_sizeYesYesYesBothYes
query_cache_limitYesYesYesGlobalYes
query_cache_min_res_unitYesYesYesGlobalYes
query_cache_sizeYesYesYesGlobalYes
query_cache_typeYesYesYesBothYes
query_cache_wlock_invalidateYesYesYesBothYes
query_prealloc_sizeYesYesYesBothYes
rand_seed1  YesSessionYes
rand_seed2  YesSessionYes
range_alloc_block_sizeYesYesYesBothYes
read_buffer_sizeYesYesYesBothYes
read_onlyYesYesYesGlobalYes
read_rnd_buffer_sizeYesYesYesBothYes
relay-logYesYes  No
Variablerelay_log  YesGlobalNo
relay-log-indexYesYes  No
Variablerelay_log_index  YesGlobalNo
relay_log_indexYesYesYesGlobalNo
relay_log_info_fileYesYesYesGlobalNo
relay_log_purgeYesYesYesGlobalYes
relay_log_recoveryYesYesYesGlobalYes
relay_log_space_limitYesYesYesGlobalNo
report-hostYesYes  No
Variablereport_host  YesGlobalNo
report-passwordYesYes  No
Variablereport_password  YesGlobalNo
report-portYesYes  No
Variablereport_port  YesGlobalNo
report-userYesYes  No
Variablereport_user  YesGlobalNo
rpl_recovery_rank  YesGlobalYes
rpl_semi_sync_master_enabled  YesGlobalYes
rpl_semi_sync_master_timeout  YesGlobalYes
rpl_semi_sync_master_trace_level  YesGlobalYes
rpl_semi_sync_master_wait_no_slave  YesGlobalYes
rpl_semi_sync_slave_enabled  YesGlobalYes
rpl_semi_sync_slave_trace_level  YesGlobalYes
secure-authYesYes  Yes
Variablesecure_auth  YesGlobalYes
secure-file-privYesYes  No
Variablesecure_file_priv  YesGlobalNo
server-idYesYes  Yes
Variableserver_id  YesGlobalYes
server_id_bitsYesYesYesGlobalNo
server-id-bitsYesYes  No
Variableserver_id_bits  YesGlobalNo
shared_memoryYesYesYesGlobalNo
shared_memory_base_name  YesGlobalNo
skip_external_lockingYesYesYesGlobalNo
skip-name-resolveYesYes  No
Variableskip_name_resolve  YesGlobalNo
skip-networkingYesYes  No
Variableskip_networking  YesGlobalNo
skip-show-databaseYesYes  No
Variableskip_show_database  YesGlobalNo
slave_allow_batchingYesYesYesGlobalYes
slave_compressed_protocolYesYesYesGlobalYes
slave_exec_modeYesYesYesGlobalYes
slave-load-tmpdirYesYes  No
Variableslave_load_tmpdir  YesGlobalNo
slave_max_allowed_packet  YesGlobalYes
slave-net-timeoutYesYes  Yes
Variableslave_net_timeout  YesGlobalYes
slave-skip-errorsYesYes  No
Variableslave_skip_errors  YesGlobalNo
slave_transaction_retriesYesYesYesGlobalYes
slave_type_conversionsYesYesYesGlobalNo
slow_launch_timeYesYesYesGlobalYes
slow-query-logYesYes  Yes
Variableslow_query_log  YesGlobalYes
slow_query_log_fileYesYesYesGlobalYes
socketYesYesYesGlobalNo
sort_buffer_sizeYesYesYesBothYes
sql_auto_is_null  YesVariesYes
sql_big_selects  YesVariesYes
sql_big_tables  YesVariesYes
sql_buffer_result  YesVariesYes
sql_log_bin  YesVariesYes
sql_log_off  YesVariesYes
sql_log_update  YesSessionYes
sql_low_priority_updates  YesBothYes
sql_max_join_size  YesBothYes
sql-modeYesYes  Yes
Variablesql_mode  YesBothYes
sql_notes  YesVariesYes
sql_quote_show_create  YesVariesYes
sql_safe_updates  YesVariesYes
sql_select_limit  YesBothYes
sql_slave_skip_counter  YesGlobalYes
sql_warnings  YesVariesYes
ssl-caYesYes  No
Variablessl_ca  YesGlobalNo
ssl-capathYesYes  No
Variablessl_capath  YesGlobalNo
ssl-certYesYes  No
Variablessl_cert  YesGlobalNo
ssl-cipherYesYes  No
Variablessl_cipher  YesGlobalNo
ssl-keyYesYes  No
Variablessl_key  YesGlobalNo
storage_engine  YesBothYes
stored_program_cacheYesYesYesGlobalYes
sync_binlogYesYesYesGlobalYes
sync_frmYesYesYesGlobalYes
sync_master_infoYesYesYesGlobalYes
sync_relay_logYesYesYesGlobalYes
sync_relay_log_infoYesYesYesGlobalYes
system_time_zone  YesGlobalNo
table_definition_cache  YesGlobalYes
table_lock_wait_timeoutYesYesYesGlobalYes
table_open_cache  YesGlobalYes
table_type  YesBothYes
thread_cache_sizeYesYesYesGlobalYes
thread_concurrencyYesYesYesGlobalNo
thread_handlingYesYesYesGlobalNo
thread_pool_algorithmYesYesYesGlobalNo
thread_pool_high_priority_connectionYesYesYesBothYes
thread_pool_max_unused_threadsYesYesYesGlobalYes
thread_pool_prio_kickup_timerYesYesYesBothYes
thread_pool_sizeYesYesYesGlobalNo
thread_pool_stall_limitYesYesYesGlobalYes
thread_stackYesYesYesGlobalNo
time_format  YesVariesNo
time_zone  YesBothYes
timed_mutexesYesYesYesGlobalYes
timestamp  YesSessionYes
tmp_table_sizeYesYesYesBothYes
tmpdirYesYesYesGlobalNo
transaction_alloc_block_sizeYesYesYesBothYes
transaction_allow_batching  YesSessionYes
transaction_prealloc_sizeYesYesYesBothYes
tx_isolation  YesBothYes
unique_checks  YesVariesYes
updatable_views_with_limitYesYesYesBothYes
version  YesGlobalNo
version_comment  YesGlobalNo
version_compile_machine  YesGlobalNo
version_compile_os  YesGlobalNo
wait_timeoutYesYesYesBothYes
warning_count  YesSessionNo

[a] This option is dynamic, but only the server should set this information. You should not set the value of this variable manually.

[b] This option is dynamic, but only the server should set this information. You should not set the value of this variable manually.

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