MySQL 8.0重要新参数

binlog_expire_logs_seconds    自动清理历史Binlog

binlog_row_value_options    json优化版本binlog

cte_max_recursion_depth    cte递归深度

    cte：Common Table Express

innodb_checkpoint_disabled    DEBUG模式的参数，用于调试recovery

innodb_ddl_log_crash_reset_debug    DEBUG模式参数，Enable this debug option to reset DDL log crash injection counters to 1. 

innodb_log_checkpoint_fuzzy_now    DEBUG模式参数，Enable this debug option to force InnoDB to write a fuzzy checkpoint.

innodb_log_spin_cpu_abs_lwm

innodb_log_spin_cpu_pct_hwm

innodb_log_wait_for_flush_spin_hwm

    Optimize the use of spin delay by user threads waiting for flushed redo. 

    以上几个参数参考：https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-logging.html

    innodb_log_buffer_size在8.0变成动态参数

innodb_print_ddl_logs    打印改写系统表的DDL日志（现在DDL是原子的，有一个mysql.innodb_ddl_log系统表记录）

innodb_scan_directories    There are two tablespace map files (tablespaces.open.1 and tablespaces.open.2) that are written to in circular fashion. Tablespace map file丢失的时候，指定一个扫tablespace的路径 https://dev.mysql.com/doc/refman/8.0/en/innodb-recovery.html#innodb-tablespace-discovery-scan-directory 

innodb_temp_tablespaces_dir    临时表目录

internal_tmp_mem_storage_engine    支持两个参数TempTable和MEMORY

original_commit_timestamp    replication的时候备库执行还是用主库的timestamp

persisted_globals_load    加载持久化的变量配置

resultset_metadata    不传metadata给client

temptable_max_ram    TempTable占用的最大内存，超出就写DISK

windowing_use_high_precision    Whether to compute window operations without loss of precision.