許多服務器系統變量是動態的,可以使用SET GLOBAL或SET SESSION在運行時設置。你還可以使用SELECT獲得它們的值。參見9.4節,“系統變量”。
下面的表列出了所有動態系統變量。最后1列說明每個變量是否適用GLOBAL或SESSION(或二者)。
變量名 |
值類型 |
類型 |
autocommit |
boolean |
SESSION |
big_tables |
boolean |
SESSION |
binlog_cache_size |
numeric |
GLOBAL |
bulk_insert_buffer_size |
numeric |
GLOBAL | SESSION |
character_set_client |
string |
GLOBAL | SESSION |
character_set_connection |
string |
GLOBAL | SESSION |
character_set_results |
string |
GLOBAL | SESSION |
character_set_server |
string |
GLOBAL | SESSION |
collation_connection |
string |
GLOBAL | SESSION |
collation_server |
string |
GLOBAL | SESSION |
completion_type |
numeric |
GLOBAL | SESSION |
concurrent_insert |
boolean |
GLOBAL |
connect_timeout |
numeric |
GLOBAL |
convert_character_set |
string |
GLOBAL | SESSION |
default_week_format |
numeric |
GLOBAL | SESSION |
delay_key_write |
OFF | ON | ALL |
GLOBAL |
delayed_insert_limit |
numeric |
GLOBAL |
delayed_insert_timeout |
numeric |
GLOBAL |
delayed_queue_size |
numeric |
GLOBAL |
div_precision_increment |
numeric |
GLOBAL | SESSION |
engine_condition_pushdown |
boolean |
GLOBAL | SESSION |
error_count |
numeric |
SESSION |
expire_logs_days |
numeric |
GLOBAL |
flush |
boolean |
GLOBAL |
flush_time |
numeric |
GLOBAL |
foreign_key_checks |
boolean |
SESSION |
ft_boolean_syntax |
numeric |
GLOBAL |
group_concat_max_len |
numeric |
GLOBAL | SESSION |
identity |
numeric |
SESSION |
innodb_autoextend_increment |
numeric |
GLOBAL |
innodb_concurrency_tickets |
numeric |
GLOBAL |
innodb_max_dirty_pages_pct |
numeric |
GLOBAL |
innodb_max_purge_lag |
numeric |
GLOBAL |
innodb_support_xa |
boolean |
GLOBAL | SESSION |
innodb_sync_spin_loops |
numeric |
GLOBAL |
innodb_table_locks |
boolean |
GLOBAL | SESSION |
innodb_thread_concurrency |
numeric GLOBAL |
|
innodb_thread_sleep_delay |
numeric GLOBAL |
|
insert_id |
boolean |
SESSION |
interactive_timeout |
numeric |
GLOBAL | SESSION |
join_buffer_size |
numeric |
GLOBAL | SESSION |
key_buffer_size |
numeric |
GLOBAL |
last_insert_id |
numeric |
SESSION |
local_infile |
boolean |
GLOBAL |
log_warnings |
numeric |
GLOBAL |
long_query_time |
numeric |
GLOBAL | SESSION |
low_priority_updates |
boolean |
GLOBAL | SESSION |
max_allowed_packet |
numeric |
GLOBAL | SESSION |
max_binlog_cache_size |
numeric |
GLOBAL |
max_binlog_size |
numeric |
GLOBAL |
max_connect_errors |
numeric |
GLOBAL |
max_connections |
numeric |
GLOBAL |
max_delayed_threads |
numeric |
GLOBAL |
max_error_count |
numeric |
GLOBAL | SESSION |
max_heap_table_size |
numeric |
GLOBAL | SESSION |
max_insert_delayed_threads |
numeric |
GLOBAL |
max_join_size |
numeric |
GLOBAL | SESSION |
max_relay_log_size |
numeric |
GLOBAL |
max_seeks_for_key |
numeric |
GLOBAL | SESSION |
max_sort_length |
numeric |
GLOBAL | SESSION |
max_tmp_tables |
numeric |
GLOBAL | SESSION |
max_user_connections |
numeric |
GLOBAL |
max_write_lock_count |
numeric |
GLOBAL |
myisam_stats_method |
enum |
GLOBAL | SESSION |
multi_read_range |
numeric |
GLOBAL | SESSION |
myisam_data_pointer_size |
numeric |
GLOBAL |
log_bin_trust_routine_creators |
boolean |
GLOBAL |
myisam_max_sort_file_size |
numeric |
GLOBAL | SESSION |
myisam_repair_threads |
numeric |
GLOBAL | SESSION |
myisam_sort_buffer_size |
numeric |
GLOBAL | SESSION |
net_buffer_length |
numeric |
GLOBAL | SESSION |
net_read_timeout |
numeric |
GLOBAL | SESSION |
net_retry_count |
numeric |
GLOBAL | SESSION |
net_write_timeout |
numeric |
GLOBAL | SESSION |
old_passwords |
numeric |
GLOBAL | SESSION |
optimizer_prune_level |
numeric |
GLOBAL | SESSION |
optimizer_search_depth |
numeric |
GLOBAL | SESSION |
preload_buffer_size |
numeric |
GLOBAL | SESSION |
query_alloc_block_size |
numeric |
GLOBAL | SESSION |
query_cache_limit |
numeric |
GLOBAL |
query_cache_size |
numeric |
GLOBAL |
query_cache_type |
enumeration |
GLOBAL | SESSION |
query_cache_wlock_invalidate |
boolean |
GLOBAL | SESSION |
query_prealloc_size |
numeric |
GLOBAL | SESSION |
range_alloc_block_size |
numeric |
GLOBAL | SESSION |
read_buffer_size |
numeric |
GLOBAL | SESSION |
read_only |
numeric |
GLOBAL |
read_rnd_buffer_size |
numeric |
GLOBAL | SESSION |
rpl_recovery_rank |
numeric |
GLOBAL |
safe_show_database |
boolean |
GLOBAL |
secure_auth |
boolean |
GLOBAL |
server_id |
numeric |
GLOBAL |
slave_compressed_protocol |
boolean |
GLOBAL |
slave_net_timeout |
numeric |
GLOBAL |
slave_transaction_retries |
numeric |
GLOBAL |
slow_launch_time |
numeric |
GLOBAL |
sort_buffer_size |
numeric |
GLOBAL | SESSION |
sql_auto_is_null |
boolean |
SESSION |
sql_big_selects |
boolean |
SESSION |
sql_big_tables |
boolean |
SESSION |
sql_buffer_result |
boolean |
SESSION |
sql_log_bin |
boolean |
SESSION |
sql_log_off |
boolean |
SESSION |
sql_log_update |
boolean |
SESSION |
sql_low_priority_updates |
boolean |
GLOBAL | SESSION |
sql_max_join_size |
numeric |
GLOBAL | SESSION |
sql_mode |
enumeration |
GLOBAL | SESSION |
sql_notes |
boolean |
SESSION |
sql_quote_show_create |
boolean |
SESSION |
sql_safe_updates |
boolean |
SESSION |
sql_select_limit |
numeric |
SESSION |
sql_slave_skip_counter |
numeric |
GLOBAL |
updatable_views_with_limit |
enumeration |
GLOBAL | SESSION |
sql_warnings |
boolean |
SESSION |
sync_binlog |
numeric |
GLOBAL |
sync_frm |
boolean |
GLOBAL |
storage_engine |
enumeration |
GLOBAL | SESSION |
table_cache |
numeric |
GLOBAL |
table_type |
enumeration |
GLOBAL | SESSION |
thread_cache_size |
numeric |
GLOBAL |
time_zone |
string |
GLOBAL | SESSION |
timestamp |
boolean |
SESSION |
tmp_table_size |
enumeration |
GLOBAL | SESSION |
transaction_alloc_block_size |
numeric |
GLOBAL | SESSION |
transaction_prealloc_size |
numeric |
GLOBAL | SESSION |
tx_isolation |
enumeration |
GLOBAL | SESSION |
unique_checks |
boolean |
SESSION |
wait_timeout |
numeric |
GLOBAL | SESSION |
warning_count |
numeric |
SESSION |
標記為string的變量采用字符串值。標記為numeric的變量采用數字值。標記為boolean的變量可以設置為0、1、ON或OFF。標記為enumeration的變量一般情況應設置為該變量的某個可用值,但還可以設置為對應期望的枚舉值的數字。對于枚舉系統變量,第1個枚舉值應對應0。這不同于ENUM列,第1個枚舉值對應1。