13 table_definition_cache 主要是维护Mysql 表定义的缓存数量,较大的值可以提高对于表定义的缓存命中率,加快表的访问速度MySQL以下默认值400, 8.0 默认为2000 (32768) 14 table_open_cache 这个参数主要的目标是在打开表后将表的元数据部分进行缓存,避免频繁打开和关闭表引起的性能问题,通过缓存,在用到的时候,直接...
m_registry_committed 加入时机: dd::cache::Dictionary_client::remove_uncommitted_objects 比如实例化的函数: dd::cache::Dictionary_client::remove_uncommitted_objectsdd::Table m_registry_dropped 加入时机: dd::cache::Dictionary_client::register_dropped_object 比如实例化的函数: dd::cache::Dictionary_cli...
tablespace_definition_cache: 可以保存在字典对象缓存中的表空间定义对象的数量。MySQL 8.0.0 中添加。 temptable_max_mmap: TempTable 存储引擎可以从内存映射临时文件中分配的最大内存量。MySQL 8.0.23 中添加。 temptable_max_ram: 定义在数据存储在磁盘之前 TempTable 存储引擎可以占用的最大内存量。MySQL 8.0.2 ...
table_open_cache = 16384 table_definition_cache = 8192 net_retry_count = 16384 key_buffer_size = 256M max_allowed_packet = 64M long_query_time = 2 slow_query_log = 1 skip-symbolic-links innodb_flush_method = O_DIRECT innodb_log_file_size = 256M ...
innodb_file_per_table = 1 innodb_rollback_on_timeout innodb_io_capacity = 2000 table_open_cache = 2048 table_definition_cache = 2048 table_open_cache = 2048 max_heap_table_size = 96M sort_buffer_size = 128K join_buffer_size = 128K ...
table_definition_cache = 1024 thread_stack = 512K sort_buffer_size = 4M join_buffer_size = 4M read_buffer_size = 8M read_rnd_buffer_size = 4M bulk_insert_buffer_size = 64M thread_cache_size = 768 interactive_timeout = 600 wait_timeout = 600 ...
performance_schema_max_table_instances=600table_definition_cache=400table_open_cache=256[mysql]default-character-set=utf8mb4[client]default-character-set=utf8mb4 D:\tool\MYSQL\mysql-8.0.12-winx64\bin>mysqld –initialize –console mysqld: Can’t create/write to file ‘D: ool\MYSQL\mysql-8.0...
“system tables” hold meta data or data in the mysql schema. The dictionary tables are designed to be extendible. Note that therefore you will not find any “future looking” fields in the table definitions. Please see WL#6379 for details on the schema definition of the data dictionary ...
#table_definition_cache=400 #优化参数,按事务刷盘,刷日志 [0:最快模式,1:安全模式,2:比0安全但比0要慢] innodb_flush_log_at_trx_commit=2 # 提交1次事务刷1次,可以为n sync_binlog=1 # 默认使用“mysql_native_password”插件认证 default_authentication_plugin=mysql_native_password ...
table_definition_cache = 1024 thread_stack = 512K sort_buffer_size = 4M join_buffer_size = 4M read_buffer_size = 8M read_rnd_buffer_size = 4M bulk_insert_buffer_size = 64M thread_cache_size = 768 interactive_timeout = 600 wait_timeout = 600 ...