background. It is equivalent to the command line "-D" argument. It �→ can be disabled by the command line "-db" argument. defaults # Default configuration. log global # Inherits the settings of the global �→ prepare the test data: sysbench oltp_common \ --threads=16 \ --rand-type=uniform \ --db-driver=mysql \ --mysql-db=sbtest \ --mysql-host=$aws_nlb_host \ --mysql-port=$aws_nlb_port \ --mysql-user=root \ $testname \ --threads=$threads \ --time=1200 \ --report-interval=1 \ --rand-type=uniform \ --db-driver=mysql \ --mysql-db=sbtest \ --mysql-host=$aws_nlb_host \ --mysql-port=$aws_nlb_port \ run --tables=16 --table-size=10000000

�→ 确保该值足够大，保证 HAProxy 不会成为瓶颈。 daemon # 让 HAProxy 以守护进程的方式工作于后台， �→ 等同于命令行参数“-D”的功能。当然，也可以在命令行中用“-db”参数将其禁用。 defaults # 默认配置。 log global # 日志继承全局配置段的设置。 retries 2 # 向上游服务器尝试连接的最大次数， �→ 超过此值便认为后端服务器不可用。 准备测试数据 执行以下命令来准备测试数据： sysbench oltp_common \ --threads=16 \ --rand-type=uniform \ --db-driver=mysql \ --mysql-db=sbtest \ --mysql-host=$aws_nlb_host \ --mysql-port=$aws_nlb_port \ --mysql-user=root --threads=$threads \ --time=1200 \ --report-interval=1 \ --rand-type=uniform \ --db-driver=mysql \ --mysql-db=sbtest \ --mysql-host=$aws_nlb_host \ --mysql-port=$aws_nlb_port \ run --tables=16

results #39266 @fixdb • TiKV • Fix an error in Raft Engine ctl #11119 @tabokie • Fix the Get raft db is not allowed error when executing the compact raft command in tikv-ctl #13515 @guoxiangCN 87 • and the number of the instances of each component, run a command like this: tiup playground v6.5.9 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as and the number of the instances of each component, run a command like this: tiup playground v6.5.9 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as

unified and controllable experience for data import. For more information, see documentation. 2.2.1.6 DB operations • FLASHBACK CLUSTER supports specifying a precise TSO #48372 @BornChanger In TiDB v7.6 version and the number of instances of each component, run a command like this: tiup playground v7.6.0 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as version and the number of instances of each component, run a command like this: tiup playground v7.6.0 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as

MySQL 8.0 databases with the �→ default collation are now much smoother. 37 DB Operations and Observability TiDB Lightning's physical import mode integrated into TiDB with with wide tables, internal test data shows that performance can be improved by up to 94%. 2.2.1.3 DB operations • DDL jobs support pause and resume operations (GA) #18015 @godouxm The pause and resume version and the number of instances of each component, run a command like this: tiup playground v7.5.1 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as

improves data consistency and query efficiency. For more information, see documentation. 2.2.1.4 DB operations • Support smooth cluster upgrade without manually canceling DDL operations (experi- mental) version and the number of instances of each component, run a command like this: tiup playground v7.1.5 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as version and the number of instances of each component, run a command like this: tiup playground v7.1.5 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as

the impact of the sudden query �→ performance problem on the entire database. DB Operations and Observability Support monitoring index usage statistics (introduced in v8.0 default values when adding columns by ADD COLUMN. For more information, see documentation. 40 2.2.1.3 DB operations • Enable the TiDB Distributed eXecution Framework (DXF) by default to enhance the performance version and the number of instances of each component, run a command like this: tiup playground v8.1.0 --db 2 --pd 3 --kv 3 The command downloads a version cluster to the local machine and starts it, such as

less rigid and �→ enhancing stability across a wider array of tables.