[mysqld]

# 连接和线程管理
max_connections = 200            # 小机型避免连接风暴
thread_cache_size = 64
interactive_timeout = 20
wait_timeout = 20

# InnoDB设置
innodb_buffer_pool_size = 512M   # 2G RAM 中最重要的分配，留足系统空间
innodb_buffer_pool_instances = 1 # 小内存不需要分片
innodb_log_buffer_size = 8M
innodb_redo_log_capacity = 64M
innodb_lock_wait_timeout = 30
innodb_file_per_table = 1
innodb_flush_log_at_trx_commit = 1
innodb_io_capacity = 400          # 普通SSD预期值
innodb_io_capacity_max = 800

# 缓存和表限制
table_open_cache = 512
open_files_limit = 20000
tmp_table_size = 32M
max_heap_table_size = 32M
max_allowed_packet = 32M

# 缓冲区大小
sort_buffer_size = 2M
read_buffer_size = 512K
join_buffer_size = 1M

# 日志管理
log_error_verbosity = 3
slow_query_log = 1
slow_query_log_file = /var/log/mysql/slow.log
long_query_time = 1
log_queries_not_using_indexes = 1

# 其他
sql_mode=STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION
performance_schema=ON
disable-log-bin