https://docs.pingcap.com/zh/tidb/stable/system-variables#tidb_index_lookup_concurrency
https://docs.pingcap.com/zh/tidb/stable/backup-and-restore-using-dumpling-lightning#使用-dumpling-和-tidb-lightning-备份与恢复
https://docs.pingcap.com/zh/tidb/stable/benchmark-tidb-using-sysbench#数据导入
文档在这，你可以查阅一下~